tools: Mass fixing of empty prototypes (for -Wstrict-prototypes)

components/app_trace/app_trace.c

@@ -360,7 +360,7 @@ static esp_apptrace_hw_t s_trace_hw[ESP_APPTRACE_HW_MAX] = {
     }
 };
 
-static inline int esp_apptrace_log_lock()
+static inline int esp_apptrace_log_lock(void)
 {
 #if ESP_APPTRACE_PRINT_LOCK
     esp_apptrace_tmo_t tmo;
@@ -372,14 +372,14 @@ static inline int esp_apptrace_log_lock()
 #endif
 }
 
-static inline void esp_apptrace_log_unlock()
+static inline void esp_apptrace_log_unlock(void)
 {
  #if ESP_APPTRACE_PRINT_LOCK
     esp_apptrace_lock_give(&s_log_lock);
 #endif
 }
 
-static inline esp_err_t esp_apptrace_lock_initialize()
+static inline esp_err_t esp_apptrace_lock_initialize(void)
 {
 #if CONFIG_ESP32_APPTRACE_LOCK_ENABLE
     esp_apptrace_lock_init(&s_trace_buf.lock);
@@ -387,7 +387,7 @@ static inline esp_err_t esp_apptrace_lock_initialize()
     return ESP_OK;
 }
 
-static inline esp_err_t esp_apptrace_lock_cleanup()
+static inline esp_err_t esp_apptrace_lock_cleanup(void)
 {
     return ESP_OK;
 }
@@ -403,7 +403,7 @@ esp_err_t esp_apptrace_lock(esp_apptrace_tmo_t *tmo)
     return ESP_OK;
 }
 
-esp_err_t esp_apptrace_unlock()
+esp_err_t esp_apptrace_unlock(void)
 {
     esp_err_t ret = ESP_OK;
 #if CONFIG_ESP32_APPTRACE_LOCK_ENABLE
@@ -413,7 +413,7 @@ esp_err_t esp_apptrace_unlock()
 }
 
 #if CONFIG_ESP32_APPTRACE_DEST_TRAX
-static void esp_apptrace_trax_init()
+static void esp_apptrace_trax_init(void)
 {
     // Stop trace, if any (on the current CPU)
     eri_write(ERI_TRAX_TRAXCTRL, TRAXCTRL_TRSTP);
@@ -449,7 +449,7 @@ static void esp_apptrace_trax_pend_chunk_sz_update(uint16_t size)
     }
 }
 
-static uint16_t esp_apptrace_trax_pend_chunk_sz_get()
+static uint16_t esp_apptrace_trax_pend_chunk_sz_get(void)
 {
     uint16_t ch_sz;
     ESP_APPTRACE_LOGD("Get chunk enter %d w-r-s %d-%d-%d", s_trace_buf.trax.cur_pending_chunk_sz,
@@ -467,7 +467,7 @@ static uint16_t esp_apptrace_trax_pend_chunk_sz_get()
 #endif
 
 // assumed to be protected by caller from multi-core/thread access
-static esp_err_t esp_apptrace_trax_block_switch()
+static esp_err_t esp_apptrace_trax_block_switch(void)
 {
     int prev_block_num = s_trace_buf.trax.state.in_block % 2;
     int new_block_num = prev_block_num ? (0) : (1);
@@ -845,7 +845,7 @@ static esp_err_t esp_apptrace_trax_status_reg_get(uint32_t *val)
     return ESP_OK;
 }
 
-static esp_err_t esp_apptrace_trax_dest_init()
+static esp_err_t esp_apptrace_trax_dest_init(void)
 {
     for (int i = 0; i < ESP_APPTRACE_TRAX_BLOCKS_NUM; i++) {
         s_trace_buf.trax.blocks[i].start = (uint8_t *)s_trax_blocks[i];
@@ -874,7 +874,7 @@ static esp_err_t esp_apptrace_trax_dest_init()
 }
 #endif
 
-esp_err_t esp_apptrace_init()
+esp_err_t esp_apptrace_init(void)
 {
     int res;
 

components/app_trace/gcov/gcov_rtio.c

@@ -114,7 +114,7 @@ static int esp_dbg_stub_gcov_entry(void)
 #endif
 }
 
-void esp_gcov_dump()
+void esp_gcov_dump(void)
 {
     // disable IRQs on this CPU, other CPU is halted by OpenOCD
     unsigned irq_state = portENTER_CRITICAL_NESTED();

components/app_trace/heap_trace_tohost.c

@@ -32,7 +32,7 @@
 
 static bool s_tracing;
 
-esp_err_t heap_trace_init_tohost()
+esp_err_t heap_trace_init_tohost(void)
 {
     if (s_tracing) {
         return ESP_ERR_INVALID_STATE;

components/app_trace/include/esp_app_trace.h

@@ -33,7 +33,7 @@ typedef enum {
  *
  * @return ESP_OK on success, otherwise see esp_err_t
  */
-esp_err_t esp_apptrace_init();
+esp_err_t esp_apptrace_init(void);
 
 /**
  * @brief Configures down buffer.

components/app_trace/sys_view/Config/SEGGER_RTT_Conf.h

@@ -285,12 +285,12 @@ Revision: $Rev: 5626 $
 *       RTT lock configuration fallback
 */
 #ifndef   SEGGER_RTT_LOCK
-  void SEGGER_SYSVIEW_X_RTT_Lock();
+  void SEGGER_SYSVIEW_X_RTT_Lock(void);
   #define SEGGER_RTT_LOCK()                SEGGER_SYSVIEW_X_RTT_Lock() // Lock RTT (nestable)   (i.e. disable interrupts)
 #endif
 
 #ifndef   SEGGER_RTT_UNLOCK
-  void SEGGER_SYSVIEW_X_RTT_Unlock();
+  void SEGGER_SYSVIEW_X_RTT_Unlock(void);
   #define SEGGER_RTT_UNLOCK()              SEGGER_SYSVIEW_X_RTT_Unlock() // Unlock RTT (nestable) (i.e. enable previous interrupt lock state)
 #endif
 

components/app_trace/sys_view/Config/SEGGER_SYSVIEW_Conf.h

@@ -166,7 +166,7 @@ Revision: $Rev: 5927 $
   #define SEGGER_SYSVIEW_GET_INTERRUPT_ID()   SEGGER_SYSVIEW_X_GetInterruptId() // Get the currently active interrupt Id from the user-provided function.
 #endif
 
-unsigned SEGGER_SYSVIEW_X_SysView_Lock();
+unsigned SEGGER_SYSVIEW_X_SysView_Lock(void);
 void SEGGER_SYSVIEW_X_SysView_Unlock(unsigned int_state);
 // to be recursive save IRQ status on the stack of the caller
 #define SEGGER_SYSVIEW_LOCK()   unsigned _SYSVIEW_int_state = SEGGER_SYSVIEW_X_SysView_Lock()

components/app_trace/sys_view/Sample/Config/SEGGER_SYSVIEW_Config_FreeRTOS.c

@@ -244,7 +244,7 @@ static void _cbSendSystemDesc(void) {
 *
 **********************************************************************
 */
-static void SEGGER_SYSVIEW_TS_Init()
+static void SEGGER_SYSVIEW_TS_Init(void)
 {
     /* We only need to initialize something if we use Timer Group.
      * esp_timer and ccount can be used as is.
@@ -316,7 +316,7 @@ void SEGGER_SYSVIEW_Conf(void) {
   SEGGER_SYSVIEW_DisableEvents(disable_evts);
 }
 
-U32 SEGGER_SYSVIEW_X_GetTimestamp()
+U32 SEGGER_SYSVIEW_X_GetTimestamp(void)
 {
 #if TS_USE_TIMERGROUP
     uint64_t ts = 0;
@@ -329,15 +329,15 @@ U32 SEGGER_SYSVIEW_X_GetTimestamp()
 #endif
 }
 
-void SEGGER_SYSVIEW_X_RTT_Lock()
+void SEGGER_SYSVIEW_X_RTT_Lock(void)
 {
 }
 
-void SEGGER_SYSVIEW_X_RTT_Unlock()
+void SEGGER_SYSVIEW_X_RTT_Unlock(void)
 {
 }
 
-unsigned SEGGER_SYSVIEW_X_SysView_Lock()
+unsigned SEGGER_SYSVIEW_X_SysView_Lock(void)
 {
     esp_apptrace_tmo_t tmo;
     esp_apptrace_tmo_init(&tmo, SEGGER_LOCK_WAIT_TMO);

components/app_trace/test/test_trace.c

@@ -125,7 +125,7 @@ typedef struct {
 static SemaphoreHandle_t s_print_lock;
 #endif
 
-static uint64_t esp_apptrace_test_ts_get();
+static uint64_t esp_apptrace_test_ts_get(void);
 
 static void esp_apptrace_test_timer_isr(void *arg)
 {
@@ -383,7 +383,7 @@ static void esp_apptrace_test_task_crash(void *p)
 
 static int s_ts_timer_group, s_ts_timer_idx;
 
-static uint64_t esp_apptrace_test_ts_get()
+static uint64_t esp_apptrace_test_ts_get(void)
 {
     uint64_t ts = 0;
     timer_get_counter_value(s_ts_timer_group, s_ts_timer_idx, &ts);
@@ -413,7 +413,7 @@ static void esp_apptrace_test_ts_init(int timer_group, int timer_idx)
     timer_start(timer_group, timer_idx);
 }
 
-static void esp_apptrace_test_ts_cleanup()
+static void esp_apptrace_test_ts_cleanup(void)
 {
     timer_config_t config;
 

components/app_update/esp_ota_ops.c

@@ -687,12 +687,12 @@ static esp_err_t esp_ota_current_ota_is_workable(bool valid)
     return ESP_OK;
 }
 
-esp_err_t esp_ota_mark_app_valid_cancel_rollback()
+esp_err_t esp_ota_mark_app_valid_cancel_rollback(void)
 {
     return esp_ota_current_ota_is_workable(true);
 }
 
-esp_err_t esp_ota_mark_app_invalid_rollback_and_reboot()
+esp_err_t esp_ota_mark_app_invalid_rollback_and_reboot(void)
 {
     return esp_ota_current_ota_is_workable(false);
 }
@@ -715,7 +715,7 @@ static int get_last_invalid_otadata(const esp_ota_select_entry_t *two_otadata)
     return num_invalid_otadata;
 }
 
-const esp_partition_t* esp_ota_get_last_invalid_partition()
+const esp_partition_t* esp_ota_get_last_invalid_partition(void)
 {
     esp_ota_select_entry_t otadata[2];
     if (read_otadata(otadata) == NULL) {

components/app_update/include/esp_ota_ops.h

@@ -221,7 +221,7 @@ esp_err_t esp_ota_get_partition_description(const esp_partition_t *partition, es
  * @return
  *  - ESP_OK: if successful.
  */
-esp_err_t esp_ota_mark_app_valid_cancel_rollback();
+esp_err_t esp_ota_mark_app_valid_cancel_rollback(void);
 
 /**
  * @brief This function is called to roll back to the previously workable app with reboot.
@@ -233,14 +233,14 @@ esp_err_t esp_ota_mark_app_valid_cancel_rollback();
  *  - ESP_FAIL: if not successful.
  *  - ESP_ERR_OTA_ROLLBACK_FAILED: The rollback is not possible due to flash does not have any apps.
  */
-esp_err_t esp_ota_mark_app_invalid_rollback_and_reboot();
+esp_err_t esp_ota_mark_app_invalid_rollback_and_reboot(void);
 
 /**
  * @brief Returns last partition with invalid state (ESP_OTA_IMG_INVALID or ESP_OTA_IMG_ABORTED).
  *
  * @return partition.
  */
-const esp_partition_t* esp_ota_get_last_invalid_partition();
+const esp_partition_t* esp_ota_get_last_invalid_partition(void);
 
 /**
  * @brief Returns state for given partition.

components/app_update/test/test_switch_ota.c

@@ -118,7 +118,7 @@ static void reboot_as_deep_sleep(void)
 
 /* @brief Copies a current app to next partition (OTA0-15), after that ESP is rebooting and run this (the next) OTAx.
  */
-static void copy_current_app_to_next_part_and_reboot()
+static void copy_current_app_to_next_part_and_reboot(void)
 {
     const esp_partition_t *cur_app = esp_ota_get_running_partition();
     copy_current_app_to_next_part(cur_app, get_next_update_partition());

components/bootloader/subproject/main/bootloader_start.c

@@ -34,7 +34,7 @@ static int selected_boot_partition(const bootloader_state_t *bs);
  * The hardware is mostly uninitialized, flash cache is down and the app CPU is in reset.
  * We do have a stack, so we can do the initialization in C.
  */
-void __attribute__((noreturn)) call_start_cpu0()
+void __attribute__((noreturn)) call_start_cpu0(void)
 {
     // 1. Hardware initialization
     if (bootloader_init() != ESP_OK) {
@@ -113,7 +113,7 @@ static int selected_boot_partition(const bootloader_state_t *bs)
 }
 
 // Return global reent struct if any newlib functions are linked to bootloader
-struct _reent* __getreent() {
+struct _reent* __getreent(void) {
     return _GLOBAL_REENT;
 }
 

components/bootloader_support/include/bootloader_common.h

@@ -144,7 +144,7 @@ esp_err_t bootloader_common_get_partition_description(const esp_partition_pos_t
 /**
  * @brief Configure VDDSDIO, call this API to rise VDDSDIO to 1.9V when VDDSDIO regulator is enabled as 1.8V mode.
  */
-void bootloader_common_vddsdio_configure();
+void bootloader_common_vddsdio_configure(void);
 
 #ifdef __cplusplus
 }

components/bootloader_support/include/bootloader_flash_config.h

@@ -25,7 +25,7 @@ extern "C" {
  *
  * @return None
  */
-void bootloader_flash_update_id();
+void bootloader_flash_update_id(void);
 
 /**
  * @brief Set the flash CS setup and hold time.
@@ -35,7 +35,7 @@ void bootloader_flash_update_id();
  *
  * @return None
  */
-void bootloader_flash_cs_timing_config();
+void bootloader_flash_cs_timing_config(void);
 
 /**
  * @brief Configure SPI flash clock.

components/bootloader_support/include/esp_flash_encrypt.h

@@ -122,7 +122,7 @@ esp_err_t esp_flash_encrypt_region(uint32_t src_addr, size_t data_length);
  * serial re-flashing of an unauthorised code in absence of secure boot.
  *
  */
-void esp_flash_write_protect_crypt_cnt();
+void esp_flash_write_protect_crypt_cnt(void);
 
 /** @brief Return the flash encryption mode
  *
@@ -131,7 +131,7 @@ void esp_flash_write_protect_crypt_cnt();
  *
  * @return
  */
-esp_flash_enc_mode_t esp_get_flash_encryption_mode();
+esp_flash_enc_mode_t esp_get_flash_encryption_mode(void);
 
 #ifdef __cplusplus
 }

components/bootloader_support/include_bootloader/bootloader_flash.h

@@ -35,7 +35,7 @@
  *
  * @return Number of free pages
  */
-uint32_t bootloader_mmap_get_free_pages();
+uint32_t bootloader_mmap_get_free_pages(void);
 
 /**
  * @brief Map a region of flash to data memory

components/bootloader_support/include_bootloader/bootloader_init.h

@@ -25,4 +25,4 @@
  *  @return ESP_OK   - If the setting is successful.
  *          ESP_FAIL - If the setting is not successful.
  */
-esp_err_t bootloader_init();
+esp_err_t bootloader_init(void);

components/bootloader_support/include_bootloader/bootloader_sha.h

@@ -26,7 +26,7 @@
 
 typedef void *bootloader_sha256_handle_t;
 
-bootloader_sha256_handle_t bootloader_sha256_start();
+bootloader_sha256_handle_t bootloader_sha256_start(void);
 
 void bootloader_sha256_data(bootloader_sha256_handle_t handle, const void *data, size_t data_len);
 

components/bootloader_support/include_bootloader/flash_qio_mode.h

@@ -30,7 +30,7 @@ void bootloader_enable_qio_mode(void);
  *     mfg_id = (ID >> 16) & 0xFF;
        flash_id = ID & 0xffff;
  */
-uint32_t bootloader_read_flash_id();
+uint32_t bootloader_read_flash_id(void);
 
 #ifdef __cplusplus
 }

components/bootloader_support/src/bootloader_clock.c

@@ -18,7 +18,7 @@
 #include "soc/dport_reg.h"
 #include "soc/efuse_periph.h"
 
-void bootloader_clock_configure()
+void bootloader_clock_configure(void)
 {
     // ROM bootloader may have put a lot of text into UART0 FIFO.
     // Wait for it to be printed.

components/bootloader_support/src/bootloader_common.c

@@ -256,7 +256,7 @@ esp_err_t bootloader_common_get_partition_description(const esp_partition_pos_t
     return ESP_OK;
 }
 
-void bootloader_common_vddsdio_configure()
+void bootloader_common_vddsdio_configure(void)
 {
 #if CONFIG_BOOTLOADER_VDDSDIO_BOOST_1_9V
     rtc_vddsdio_config_t cfg = rtc_vddsdio_get_config();

components/bootloader_support/src/bootloader_flash.c

@@ -25,7 +25,7 @@ static const char *TAG = "bootloader_mmap";
 
 static spi_flash_mmap_handle_t map;
 
-uint32_t bootloader_mmap_get_free_pages()
+uint32_t bootloader_mmap_get_free_pages(void)
 {
     return spi_flash_mmap_get_free_pages(SPI_FLASH_MMAP_DATA);
 }
@@ -103,7 +103,7 @@ static bool mapped;
 // Current bootloader mapping (ab)used for bootloader_read()
 static uint32_t current_read_mapping = UINT32_MAX;
 
-uint32_t bootloader_mmap_get_free_pages()
+uint32_t bootloader_mmap_get_free_pages(void)
 {
     /**
      * Allow mapping up to 50 of the 51 available MMU blocks (last one used for reads)

components/bootloader_support/src/bootloader_flash_config.c

@@ -27,12 +27,12 @@
 #include "flash_qio_mode.h"
 #include "bootloader_flash_config.h"
 
-void bootloader_flash_update_id()
+void bootloader_flash_update_id(void)
 {
     g_rom_flashchip.device_id = bootloader_read_flash_id();
 }
 
-void IRAM_ATTR bootloader_flash_cs_timing_config()
+void IRAM_ATTR bootloader_flash_cs_timing_config(void)
 {
     SET_PERI_REG_MASK(SPI_USER_REG(0), SPI_CS_HOLD_M | SPI_CS_SETUP_M);
     SET_PERI_REG_BITS(SPI_CTRL2_REG(0), SPI_HOLD_TIME_V, 1, SPI_HOLD_TIME_S);

components/bootloader_support/src/bootloader_init.c

@@ -61,7 +61,7 @@ extern int _data_end;
 
 static const char* TAG = "boot";
 
-static esp_err_t bootloader_main();
+static esp_err_t bootloader_main(void);
 static void print_flash_info(const esp_image_header_t* pfhdr);
 static void update_flash_config(const esp_image_header_t* pfhdr);
 static void bootloader_init_flash_configure(const esp_image_header_t* pfhdr);
@@ -69,7 +69,7 @@ static void uart_console_configure(void);
 static void wdt_reset_check(void);
 
 
-esp_err_t bootloader_init()
+esp_err_t bootloader_init(void)
 {
     cpu_configure_region_protection();
     cpu_init_memctl();
@@ -117,7 +117,7 @@ esp_err_t bootloader_init()
     return ESP_OK;
 }
 
-static esp_err_t bootloader_main()
+static esp_err_t bootloader_main(void)
 {
     bootloader_common_vddsdio_configure();
     /* Read and keep flash ID, for further use. */
@@ -434,7 +434,7 @@ void __assert_func(const char *file, int line, const char *func, const char *exp
     while(1) {}
 }
 
-void abort()
+void abort(void)
 {
 #if !CONFIG_ESP32_PANIC_SILENT_REBOOT
     ets_printf("abort() was called at PC 0x%08x\r\n", (intptr_t)__builtin_return_address(0) - 3);

components/bootloader_support/src/esp32/bootloader_sha.c

@@ -27,7 +27,7 @@ static const size_t BLOCK_WORDS = (64 / sizeof(uint32_t));
 // Words in final SHA256 digest
 static const size_t DIGEST_WORDS = (32 / sizeof(uint32_t));
 
-bootloader_sha256_handle_t bootloader_sha256_start()
+bootloader_sha256_handle_t bootloader_sha256_start(void)
 {
     // Enable SHA hardware
     ets_sha_enable();

components/bootloader_support/src/esp32/flash_encrypt.c

@@ -38,7 +38,7 @@ static const char *TAG = "flash_encrypt";
 /* Static functions for stages of flash encryption */
 static esp_err_t initialise_flash_encryption(void);
 static esp_err_t encrypt_flash_contents(uint32_t flash_crypt_cnt, bool flash_crypt_wr_dis);
-static esp_err_t encrypt_bootloader();
+static esp_err_t encrypt_bootloader(void);
 static esp_err_t encrypt_and_load_partition_table(esp_partition_info_t *partition_table, int *num_partitions);
 static esp_err_t encrypt_partition(int index, const esp_partition_info_t *partition);
 
@@ -223,7 +223,7 @@ static esp_err_t encrypt_flash_contents(uint32_t flash_crypt_cnt, bool flash_cry
     return ESP_OK;
 }
 
-static esp_err_t encrypt_bootloader()
+static esp_err_t encrypt_bootloader(void)
 {
     esp_err_t err;
     uint32_t image_length;

components/bootloader_support/src/esp32/secure_boot.c

@@ -95,7 +95,7 @@ static bool secure_boot_generate(uint32_t image_len){
 }
 
 /* Burn values written to the efuse write registers */
-static inline void burn_efuses()
+static inline void burn_efuses(void)
 {
     esp_efuse_burn_new_values();
 }

components/bootloader_support/src/flash_encrypt.c

@@ -17,7 +17,7 @@
 #include "esp_efuse_table.h"
 #include "esp_flash_encrypt.h"
 
-void esp_flash_write_protect_crypt_cnt()
+void esp_flash_write_protect_crypt_cnt(void)
 {
     uint8_t flash_crypt_cnt_wr_dis = 0;
     esp_efuse_read_field_blob(ESP_EFUSE_WR_DIS_FLASH_CRYPT_CNT, &flash_crypt_cnt_wr_dis, 1);
@@ -26,7 +26,7 @@ void esp_flash_write_protect_crypt_cnt()
     }
 }
 
-esp_flash_enc_mode_t esp_get_flash_encryption_mode()
+esp_flash_enc_mode_t esp_get_flash_encryption_mode(void)
 {
     uint8_t efuse_flash_crypt_cnt_wr_protected = 0;
     uint8_t dis_dl_enc = 0, dis_dl_dec = 0, dis_dl_cache = 0;

components/bootloader_support/src/flash_qio_mode.c

@@ -53,11 +53,11 @@ typedef struct __attribute__((packed)) {
 } qio_info_t;
 
 /* Read 8 bit status using RDSR command */
-static unsigned read_status_8b_rdsr();
+static unsigned read_status_8b_rdsr(void);
 /* Read 8 bit status (second byte) using RDSR2 command */
-static unsigned read_status_8b_rdsr2();
+static unsigned read_status_8b_rdsr2(void);
 /* read 16 bit status using RDSR & RDSR2 (low and high bytes) */
-static unsigned read_status_16b_rdsr_rdsr2();
+static unsigned read_status_16b_rdsr_rdsr2(void);
 
 /* Write 8 bit status using WRSR */
 static void write_status_8b_wrsr(unsigned new_status);
@@ -67,7 +67,7 @@ static void write_status_8b_wrsr2(unsigned new_status);
 static void write_status_16b_wrsr(unsigned new_status);
 
 /* Read 8 bit status of XM25QU64A  */
-static unsigned read_status_8b_xmc25qu64a();
+static unsigned read_status_8b_xmc25qu64a(void);
 /* Write 8 bit status of XM25QU64A */
 static void write_status_8b_xmc25qu64a(unsigned new_status);
 
@@ -121,7 +121,7 @@ static uint32_t execute_flash_command(uint8_t command, uint32_t mosi_data, uint8
 
 /* dummy_len_plus values defined in ROM for SPI flash configuration */
 extern uint8_t g_rom_spiflash_dummy_len_plus[];
-uint32_t bootloader_read_flash_id()
+uint32_t bootloader_read_flash_id(void)
 {
     uint32_t id = execute_flash_command(CMD_RDID, 0, 0, 24);
     id = ((id & 0xff) << 16) | ((id >> 16) & 0xff) | (id & 0xff00);
@@ -223,17 +223,17 @@ static esp_err_t enable_qio_mode(read_status_fn_t read_status_fn,
     return ESP_OK;
 }
 
-static unsigned read_status_8b_rdsr()
+static unsigned read_status_8b_rdsr(void)
 {
     return execute_flash_command(CMD_RDSR, 0, 0, 8);
 }
 
-static unsigned read_status_8b_rdsr2()
+static unsigned read_status_8b_rdsr2(void)
 {
     return execute_flash_command(CMD_RDSR2, 0, 0, 8);
 }
 
-static unsigned read_status_16b_rdsr_rdsr2()
+static unsigned read_status_16b_rdsr_rdsr2(void)
 {
     return execute_flash_command(CMD_RDSR, 0, 0, 8) | (execute_flash_command(CMD_RDSR2, 0, 0, 8) << 8);
 }
@@ -253,7 +253,7 @@ static void write_status_16b_wrsr(unsigned new_status)
     execute_flash_command(CMD_WRSR, new_status, 16, 0);
 }
 
-static unsigned read_status_8b_xmc25qu64a()
+static unsigned read_status_8b_xmc25qu64a(void)
 {
     execute_flash_command(CMD_OTPEN, 0, 0, 0);  /* Enter OTP mode */
     esp_rom_spiflash_wait_idle(&g_rom_flashchip);

components/bootloader_support/src/idf/bootloader_sha.c

@@ -18,7 +18,7 @@
 #include <sys/param.h>
 #include <mbedtls/sha256.h>
 
-bootloader_sha256_handle_t bootloader_sha256_start()
+bootloader_sha256_handle_t bootloader_sha256_start(void)
 {
     mbedtls_sha256_context *ctx = (mbedtls_sha256_context *)malloc(sizeof(mbedtls_sha256_context));
     if (!ctx) {

components/bt/host/bluedroid/api/esp_spp_api.c

@@ -54,7 +54,7 @@ esp_err_t esp_spp_init(esp_spp_mode_t mode)
     return (btc_transfer_context(&msg, &arg, sizeof(btc_spp_args_t), NULL) == BT_STATUS_SUCCESS ? ESP_OK : ESP_FAIL);
 }
 
-esp_err_t esp_spp_deinit()
+esp_err_t esp_spp_deinit(void)
 {
     btc_msg_t msg;
     btc_spp_args_t arg;
@@ -164,7 +164,7 @@ esp_err_t esp_spp_write(uint32_t handle, int len, uint8_t *p_data)
     return (btc_transfer_context(&msg, &arg, sizeof(btc_spp_args_t), btc_spp_arg_deep_copy) == BT_STATUS_SUCCESS ? ESP_OK : ESP_FAIL);
 }
 
-esp_err_t esp_spp_vfs_register()
+esp_err_t esp_spp_vfs_register(void)
 {
     ESP_BLUEDROID_STATUS_CHECK(ESP_BLUEDROID_STATUS_ENABLED);
 

components/bt/host/bluedroid/api/include/api/esp_spp_api.h

@@ -205,7 +205,7 @@ esp_err_t esp_spp_init(esp_spp_mode_t mode);
  *              - ESP_OK: success
  *              - other: failed
  */
-esp_err_t esp_spp_deinit();
+esp_err_t esp_spp_deinit(void);
 
 
 /**

components/bt/host/bluedroid/bta/dm/bta_dm_main.c

@@ -360,7 +360,7 @@ const tBTA_DM_ST_TBL bta_dm_search_st_tbl[] = {
 ** Returns          void
 **
 *******************************************************************************/
-void bta_dm_sm_disable( )
+void bta_dm_sm_disable(void)
 {
     bta_sys_deregister( BTA_ID_DM );
 }
@@ -412,7 +412,7 @@ BOOLEAN bta_dm_sm_execute(BT_HDR *p_msg)
 ** Returns          void
 **
 *******************************************************************************/
-void bta_dm_search_sm_disable( )
+void bta_dm_search_sm_disable(void)
 {
     bta_sys_deregister( BTA_ID_DM_SEARCH );
 

components/bt/host/bluedroid/bta/dm/bta_dm_pm.c

@@ -46,7 +46,7 @@ static void bta_dm_pm_timer_cback(void *p_tle);
 static void bta_dm_pm_btm_cback(BD_ADDR bd_addr, tBTM_PM_STATUS status, UINT16 value, UINT8 hci_status);
 static BOOLEAN bta_dm_pm_park(BD_ADDR peer_addr);
 static BOOLEAN bta_dm_pm_sniff(tBTA_DM_PEER_DEVICE *p_peer_dev, UINT8 index);
-static BOOLEAN bta_dm_pm_is_sco_active ();
+static BOOLEAN bta_dm_pm_is_sco_active (void);
 static void bta_dm_pm_hid_check(BOOLEAN bScoActive);
 static void bta_dm_pm_set_sniff_policy(tBTA_DM_PEER_DEVICE *p_dev, BOOLEAN bDisable);
 static void bta_dm_pm_stop_timer_by_index(tBTA_PM_TIMER *p_timer,
@@ -1001,7 +1001,7 @@ void bta_dm_pm_timer(tBTA_DM_MSG *p_data)
 ** Returns          BOOLEAN. TRUE if SCO active, else FALSE
 **
 *******************************************************************************/
-static BOOLEAN bta_dm_pm_is_sco_active ()
+static BOOLEAN bta_dm_pm_is_sco_active (void)
 {
     int j;
     BOOLEAN bScoActive = FALSE;

components/bt/host/bluedroid/bta/gatt/bta_gattc_co.c

@@ -48,7 +48,7 @@ static void getFilename(char *buffer, BD_ADDR bda)
             , bda[0], bda[1], bda[2], bda[3], bda[4], bda[5]);
 }
 
-static void cacheClose()
+static void cacheClose(void)
 {
     if (sCacheFD != 0) {
         fclose(sCacheFD);

components/bt/host/bluedroid/bta/hf_client/bta_hf_client_at.c

@@ -94,7 +94,7 @@ UINT32 service_index = 0;
 BOOLEAN service_availability = TRUE;
 /* helper functions for handling AT commands queueing */
 
-static void bta_hf_client_handle_ok();
+static void bta_hf_client_handle_ok(void);
 
 static void bta_hf_client_clear_queued_at(void)
 {
@@ -268,7 +268,7 @@ static void bta_hf_client_start_at_hold_timer(void)
 **   No buffer parsing is being done here.
 *******************************************************************************/
 
-static void bta_hf_client_handle_ok()
+static void bta_hf_client_handle_ok(void)
 {
     APPL_TRACE_DEBUG("%s", __FUNCTION__);
 
@@ -342,7 +342,7 @@ static void bta_hf_client_handle_error(tBTA_HF_CLIENT_AT_RESULT_TYPE type, UINT1
     bta_hf_client_send_queued_at();
 }
 
-static void bta_hf_client_handle_ring()
+static void bta_hf_client_handle_ring(void)
 {
     APPL_TRACE_DEBUG("%s", __FUNCTION__);
     bta_hf_client_evt_val(BTA_HF_CLIENT_RING_INDICATION, 0);

components/bt/host/bluedroid/bta/hf_client/include/bta_hf_client_int.h

@@ -212,7 +212,7 @@ extern void bta_hf_client_sm_execute(UINT16 event,
 extern void bta_hf_client_slc_seq(BOOLEAN error);
 extern void bta_hf_client_collision_cback (tBTA_SYS_CONN_STATUS status, UINT8 id,
         UINT8 app_id, BD_ADDR peer_addr);
-extern void bta_hf_client_resume_open ();
+extern void bta_hf_client_resume_open (void);
 
 /* SDP functions */
 extern BOOLEAN bta_hf_client_add_record(char *p_service_name,

components/bt/host/bluedroid/bta/include/bta/bta_gatt_api.h

@@ -1205,7 +1205,7 @@ extern void BTA_GATTC_ConfigureMTU (UINT16 conn_id);
 ** Returns          None
 **
 *******************************************************************************/
-extern void BTA_GATTS_Init();
+extern void BTA_GATTS_Init(void);
 
 /*******************************************************************************
 **

components/bt/host/bluedroid/bta/jv/bta_jv_act.c

@@ -683,7 +683,7 @@ void bta_jv_disable (tBTA_JV_MSG *p_data)
  * list.
  * If no free PSMs exist, 0 will be returned.
  */
-static UINT16 bta_jv_get_free_psm()
+static UINT16 bta_jv_get_free_psm(void)
 {
     const int cnt = sizeof(bta_jv_cb.free_psm_list) / sizeof(bta_jv_cb.free_psm_list[0]);
     for (int i = 0; i < cnt; i++) {

components/bt/host/bluedroid/btc/core/btc_profile_queue.c

@@ -60,7 +60,7 @@ static void queue_int_add(connect_node_t *p_param)
     list_append(connect_queue, p_node);
 }
 
-static void queue_int_advance()
+static void queue_int_advance(void)
 {
     if (connect_queue && !list_is_empty(connect_queue)) {
         list_remove(connect_queue, list_front(connect_queue));

components/bt/host/bluedroid/btc/profile/std/a2dp/btc_a2dp_source.c

@@ -424,7 +424,7 @@ static void btc_a2dp_source_data_post(void)
     osi_thread_post(a2dp_source_local_param.btc_aa_src_task_hdl, btc_a2dp_source_handle_timer, NULL, 2, OSI_THREAD_MAX_TIMEOUT);
 }
 
-static UINT64 time_now_us()
+static UINT64 time_now_us(void)
 {
 #if _POSIX_TIMERS
     struct timespec ts_now;

components/bt/host/bluedroid/btc/profile/std/smp/esp_app_sec.c

@@ -79,7 +79,7 @@ void app_ble_sec_gen_ltk(UINT8 key_size)
 ** Returns          NULL
 **
 *******************************************************************************/
-void app_ble_sec_init()
+void app_ble_sec_init(void)
 {
     // Reset Security Environment
     memset(&app_sec_env, 0, sizeof(app_sec_env));

components/bt/host/bluedroid/btc/profile/std/spp/btc_spp.c

@@ -837,7 +837,7 @@ static ssize_t spp_vfs_read(int fd, void * dst, size_t size)
     return item_size;
 }
 
-esp_err_t btc_spp_vfs_register()
+esp_err_t btc_spp_vfs_register(void)
 {
     esp_vfs_t vfs = {
         .flags = ESP_VFS_FLAG_DEFAULT,

components/bt/host/bluedroid/device/controller.c

@@ -544,7 +544,7 @@ static const controller_t interface = {
 #endif /* (BTM_SCO_HCI_INCLUDED == TRUE) */
 };
 
-const controller_t *controller_get_interface()
+const controller_t *controller_get_interface(void)
 {
     static bool loaded = false;
     if (!loaded) {

components/bt/host/bluedroid/device/include/device/controller.h

@@ -86,6 +86,6 @@ typedef struct controller_t {
 #endif /* #if (BTM_SCO_HCI_INCLUDED == TRUE) */
 } controller_t;
 
-const controller_t *controller_get_interface();
+const controller_t *controller_get_interface(void);
 
 #endif /*_CONTROLLER_H_*/

components/bt/host/bluedroid/hci/hci_hal_h4.c

@@ -121,7 +121,7 @@ static bool hal_open(const hci_hal_callbacks_t *upper_callbacks, void *task_thre
     return true;
 }
 
-static void hal_close()
+static void hal_close(void)
 {
     hci_hal_env_deinit();
 
@@ -367,7 +367,7 @@ static const hci_hal_t interface = {
     transmit_data,
 };
 
-const hci_hal_t *hci_hal_h4_get_interface()
+const hci_hal_t *hci_hal_h4_get_interface(void)
 {
     return &interface;
 }

components/bt/host/bluedroid/hci/hci_layer.c

@@ -535,7 +535,7 @@ static waiting_command_t *get_waiting_command(command_opcode_t opcode)
     return NULL;
 }
 
-static void init_layer_interface()
+static void init_layer_interface(void)
 {
     if (!interface_created) {
         interface.transmit_command = transmit_command;
@@ -555,7 +555,7 @@ static const packet_fragmenter_callbacks_t packet_fragmenter_callbacks = {
     fragmenter_transmit_finished
 };
 
-const hci_t *hci_layer_get_interface()
+const hci_t *hci_layer_get_interface(void)
 {
     hal = hci_hal_h4_get_interface();
     packet_fragmenter = packet_fragmenter_get_interface();

components/bt/host/bluedroid/hci/hci_packet_factory.c

@@ -273,7 +273,7 @@ static const hci_packet_factory_t interface = {
     make_write_default_erroneous_data_report,
 };
 
-const hci_packet_factory_t *hci_packet_factory_get_interface()
+const hci_packet_factory_t *hci_packet_factory_get_interface(void)
 {
     return &interface;
 }

components/bt/host/bluedroid/hci/hci_packet_parser.c

@@ -250,7 +250,7 @@ static const hci_packet_parser_t interface = {
     parse_ble_read_suggested_default_data_length_response
 };
 
-const hci_packet_parser_t *hci_packet_parser_get_interface()
+const hci_packet_parser_t *hci_packet_parser_get_interface(void)
 {
     return &interface;
 }

components/bt/host/bluedroid/hci/include/hci/hci_layer.h

@@ -92,7 +92,7 @@ typedef struct hci_t {
     void (*transmit_downward)(uint16_t type, void *data);
 } hci_t;
 
-const hci_t *hci_layer_get_interface();
+const hci_t *hci_layer_get_interface(void);
 
 int hci_start_up(void);
 void hci_shut_down(void);

components/bt/host/bluedroid/hci/include/hci/hci_packet_factory.h

@@ -48,6 +48,6 @@ typedef struct {
     BT_HDR *(*make_write_default_erroneous_data_report)(uint8_t enable);
 } hci_packet_factory_t;
 
-const hci_packet_factory_t *hci_packet_factory_get_interface();
+const hci_packet_factory_t *hci_packet_factory_get_interface(void);
 
 #endif /*_HCI_PACKET_FACTORY_H_*/

components/bt/host/bluedroid/hci/include/hci/hci_packet_parser.h

@@ -97,6 +97,6 @@ typedef struct {
     );
 } hci_packet_parser_t;
 
-const hci_packet_parser_t *hci_packet_parser_get_interface();
+const hci_packet_parser_t *hci_packet_parser_get_interface(void);
 
 #endif /*_HCI_PACKET_PARSER_H_*/

components/bt/host/bluedroid/hci/include/hci/packet_fragmenter.h

@@ -57,6 +57,6 @@ typedef struct packet_fragmenter_t {
     void (*reassemble_and_dispatch)(BT_HDR *packet);
 } packet_fragmenter_t;
 
-const packet_fragmenter_t *packet_fragmenter_get_interface();
+const packet_fragmenter_t *packet_fragmenter_get_interface(void);
 
 #endif /* _PACKET_FRAGMENTER_H_ */

components/bt/host/bluedroid/hci/packet_fragmenter.c

@@ -55,14 +55,14 @@ static void init(const packet_fragmenter_callbacks_t *result_callbacks)
     partial_packets = hash_map_new(NUMBER_OF_BUCKETS, hash_function_naive, NULL, NULL, NULL);
 }
 
-static void cleanup()
+static void cleanup(void)
 {
     if (partial_packets) {
         hash_map_free(partial_packets);
     }
 }
 
-static BT_HDR *fragment_get_current_packet()
+static BT_HDR *fragment_get_current_packet(void)
 {
     return current_fragment_packet;
 }
@@ -224,7 +224,7 @@ static const packet_fragmenter_t interface = {
     reassemble_and_dispatch
 };
 
-const packet_fragmenter_t *packet_fragmenter_get_interface()
+const packet_fragmenter_t *packet_fragmenter_get_interface(void)
 {
     controller = controller_get_interface();
     return &interface;

components/bt/host/bluedroid/main/bte_main.c

@@ -195,7 +195,7 @@ void bte_main_enable_lpm(BOOLEAN enable)
 ** Returns          None
 **
 ******************************************************************************/
-void bte_main_lpm_allow_bt_device_sleep()
+void bte_main_lpm_allow_bt_device_sleep(void)
 {
     /**/
     //hci->send_low_power_command(LPM_WAKE_DEASSERT);
@@ -210,7 +210,7 @@ void bte_main_lpm_allow_bt_device_sleep()
 ** Returns          None
 **
 ******************************************************************************/
-void bte_main_lpm_wake_bt_device()
+void bte_main_lpm_wake_bt_device(void)
 {
     //hci->send_low_power_command(LPM_WAKE_ASSERT);
 }

components/bt/host/bluedroid/stack/avdt/avdt_api.c

@@ -171,7 +171,7 @@ void AVDT_Deregister(void)
 ** Returns          void.
 **
 *******************************************************************************/
-void AVDT_SINK_Activate()
+void AVDT_SINK_Activate(void)
 {
     tAVDT_SCB           *p_scb = &avdt_cb.scb[0];
     int                 i;
@@ -200,7 +200,7 @@ void AVDT_SINK_Activate()
 ** Returns          void.
 **
 *******************************************************************************/
-void AVDT_SINK_Deactivate()
+void AVDT_SINK_Deactivate(void)
 {
     tAVDT_SCB           *p_scb = &avdt_cb.scb[0];
     int                 i;

components/bt/host/bluedroid/stack/btm/btm_ble_adv_filter.c

@@ -90,7 +90,7 @@ static UINT8 btm_ble_cs_update_pf_counter(tBTM_BLE_SCAN_COND_OP action,
 ** Returns          status
 **
 *******************************************************************************/
-tBTM_STATUS btm_ble_obtain_vsc_details()
+tBTM_STATUS btm_ble_obtain_vsc_details(void)
 {
     tBTM_STATUS st = BTM_SUCCESS;
 

components/bt/host/bluedroid/stack/btm/btm_ble_bgconn.c

@@ -60,7 +60,7 @@ static bool bdaddr_equality_fn(const void *x, const void *y)
     return bdaddr_equals((bt_bdaddr_t *)x, (bt_bdaddr_t *)y);
 }
 
-static void background_connections_lazy_init()
+static void background_connections_lazy_init(void)
 {
     if (!background_connections) {
         background_connections = hash_map_new(background_connection_buckets,
@@ -91,7 +91,7 @@ static BOOLEAN background_connection_remove(bt_bdaddr_t *address)
     return FALSE;
 }
 
-static void background_connections_clear()
+static void background_connections_clear(void)
 {
     if (background_connections) {
         hash_map_clear(background_connections);
@@ -110,7 +110,7 @@ static bool background_connections_pending_cb(hash_map_entry_t *hash_entry, void
     return true;
 }
 
-static bool background_connections_pending()
+static bool background_connections_pending(void)
 {
     bool pending_connections = false;
     if (background_connections) {

components/bt/host/bluedroid/stack/btm/btm_ble_gap.c

@@ -2017,7 +2017,7 @@ UINT8 *BTM_CheckAdvData( UINT8 *p_adv, UINT8 type, UINT8 *p_length)
 **                     BTM_BLE_GENRAL_DISCOVERABLE
 **
 *******************************************************************************/
-UINT16 BTM_BleReadDiscoverability()
+UINT16 BTM_BleReadDiscoverability(void)
 {
     BTM_TRACE_API("%s\n", __FUNCTION__);
 
@@ -2034,7 +2034,7 @@ UINT16 BTM_BleReadDiscoverability()
 ** Returns          BTM_BLE_NON_CONNECTABLE or BTM_BLE_CONNECTABLE
 **
 *******************************************************************************/
-UINT16 BTM_BleReadConnectability()
+UINT16 BTM_BleReadConnectability(void)
 {
     BTM_TRACE_API ("%s\n", __FUNCTION__);
 

components/bt/host/bluedroid/stack/btm/btm_ble_multi_adv.c

@@ -769,7 +769,7 @@ void btm_ble_multi_adv_vse_cback(UINT8 len, UINT8 *p)
 ** Returns          void
 **
 *******************************************************************************/
-void btm_ble_multi_adv_init()
+void btm_ble_multi_adv_init(void)
 {
 #if BTM_DYNAMIC_MEMORY == TRUE
     btm_multi_adv_cb_ptr = (tBTM_BLE_MULTI_ADV_CB *)osi_malloc(sizeof(tBTM_BLE_MULTI_ADV_CB));

components/bt/host/bluedroid/stack/include/stack/btm_ble_api.h

@@ -1626,7 +1626,7 @@ BOOLEAN BTM_BleGetCurrentAddress(BD_ADDR addr, uint8_t *addr_type);
 **                     BTM_BLE_GENRAL_DISCOVERABLE
 **
 *******************************************************************************/
-UINT16 BTM_BleReadDiscoverability();
+UINT16 BTM_BleReadDiscoverability(void);
 
 /*******************************************************************************
 **
@@ -1639,7 +1639,7 @@ UINT16 BTM_BleReadDiscoverability();
 **
 *******************************************************************************/
 //extern
-UINT16 BTM_BleReadConnectability ();
+UINT16 BTM_BleReadConnectability (void);
 
 void BTM_Recovery_Pre_State(void);
 
@@ -1755,7 +1755,7 @@ void BTM_BleEnableMixedPrivacyMode(BOOLEAN mixed_on);
 **
 *******************************************************************************/
 //extern
-UINT8  BTM_BleMaxMultiAdvInstanceCount();
+UINT8  BTM_BleMaxMultiAdvInstanceCount(void);
 
 /*******************************************************************************
 **

components/coap/port/coap_io.c

@@ -80,7 +80,7 @@ void coap_free_endpoint(coap_endpoint_t *ep);
 static int ep_initialized = 0;
 
 struct coap_endpoint_t *
-  coap_malloc_endpoint() {
+  coap_malloc_endpoint(void) {
   static struct coap_endpoint_t ep;
 
   if (ep_initialized) {

components/console/commands.c

@@ -70,7 +70,7 @@ esp_err_t esp_console_init(const esp_console_config_t *config)
     return ESP_OK;
 }
 
-esp_err_t esp_console_deinit()
+esp_err_t esp_console_deinit(void)
 {
     if (!s_tmp_line_buf) {
         return ESP_ERR_INVALID_STATE;
@@ -232,7 +232,7 @@ static int help_command(int argc, char **argv)
 }
 
 
-esp_err_t esp_console_register_help_command()
+esp_err_t esp_console_register_help_command(void)
 {
     esp_console_cmd_t command = {
         .command = "help",

components/console/esp_console.h

@@ -52,7 +52,7 @@ esp_err_t esp_console_init(const esp_console_config_t* config);
  *      - ESP_OK on success
  *      - ESP_ERR_INVALID_STATE if not initialized yet
  */
-esp_err_t esp_console_deinit();
+esp_err_t esp_console_deinit(void);
 
 
 /**
@@ -185,7 +185,7 @@ const char *esp_console_get_hint(const char *buf, int *color, int *bold);
  *      - ESP_OK on success
  *      - ESP_ERR_INVALID_STATE, if esp_console_init wasn't called
  */
-esp_err_t esp_console_register_help_command();
+esp_err_t esp_console_register_help_command(void);
 
 #ifdef __cplusplus
 }

components/console/linenoise/linenoise.c

@@ -205,7 +205,7 @@ void linenoiseSetDumbMode(int set) {
 /* Use the ESC [6n escape sequence to query the horizontal cursor position
  * and return it. On error -1 is returned, on success the position of the
  * cursor. */
-static int getCursorPosition() {
+static int getCursorPosition(void) {
     char buf[32];
     int cols, rows;
     unsigned int i = 0;
@@ -228,7 +228,7 @@ static int getCursorPosition() {
 
 /* Try to get the number of columns in the current terminal, or assume 80
  * if it fails. */
-static int getColumns() {
+static int getColumns(void) {
     int start, cols;
 
     /* Get the initial position so we can restore it later. */
@@ -887,7 +887,7 @@ static int linenoiseEdit(char *buf, size_t buflen, const char *prompt)
     return l.len;
 }
 
-int linenoiseProbe() {
+int linenoiseProbe(void) {
     /* Switch to non-blocking mode */
     int flags = fcntl(STDIN_FILENO, F_GETFL);
     flags |= O_NONBLOCK;
@@ -1000,7 +1000,7 @@ void linenoiseFree(void *ptr) {
 
 /* ================================ History ================================= */
 
-void linenoiseHistoryFree() {
+void linenoiseHistoryFree(void) {
     if (history) {
         for (int j = 0; j < history_len; j++) {
             free(history[j]);

components/console/linenoise/linenoise.h

@@ -63,7 +63,7 @@ int linenoiseHistoryAdd(const char *line);
 int linenoiseHistorySetMaxLen(int len);
 int linenoiseHistorySave(const char *filename);
 int linenoiseHistoryLoad(const char *filename);
-void linenoiseHistoryFree();
+void linenoiseHistoryFree(void);
 void linenoiseClearScreen(void);
 void linenoiseSetMultiLine(int ml);
 void linenoiseSetDumbMode(int set);

components/cxx/cxx_guards.cpp

@@ -36,7 +36,7 @@ static size_t s_static_init_max_waiting_count = 0;          //!< maximum ever va
 extern "C" int __cxa_guard_acquire(__guard* pg);
 extern "C" void __cxa_guard_release(__guard* pg);
 extern "C" void __cxa_guard_abort(__guard* pg);
-extern "C" void __cxa_guard_dummy();
+extern "C" void __cxa_guard_dummy(void);
 
 /**
  * Layout of the guard object (defined by the ABI).
@@ -215,6 +215,6 @@ extern "C" void __cxa_guard_abort(__guard* pg)
  * Dummy function used to force linking this file instead of the same one in libstdc++.
  * This works via -u __cxa_guard_dummy flag in component.mk
  */
-extern "C" void __cxa_guard_dummy()
+extern "C" void __cxa_guard_dummy(void)
 {
 }

components/driver/adc1_i2s_private.h

@@ -29,7 +29,7 @@ extern "C" {
  * This is an internal API for I2S module to call to enable I2S-ADC function.
  * Note that adc_power_off() can still power down ADC.
  */
-void adc_power_always_on();
+void adc_power_always_on(void);
 
 /**
  * @brief For I2S dma to claim the usage of ADC1.
@@ -41,7 +41,7 @@ void adc_power_always_on();
  *      - ESP_OK success
  *      - ESP_ERR_TIMEOUT reserved for future use. Currently the function will wait until success.
  */
-esp_err_t adc1_i2s_mode_acquire();
+esp_err_t adc1_i2s_mode_acquire(void);
 
 /**
  * @brief For ADC1 to claim the usage of ADC1.
@@ -53,7 +53,7 @@ esp_err_t adc1_i2s_mode_acquire();
  *      - ESP_OK success
  *      - ESP_ERR_TIMEOUT reserved for future use. Currently the function will wait until success.
  */
-esp_err_t adc1_adc_mode_acquire();
+esp_err_t adc1_adc_mode_acquire(void);
 
 /**
  * @brief to let other tasks use the ADC1 when I2S is not work.
@@ -63,7 +63,7 @@ esp_err_t adc1_adc_mode_acquire();
  *
  * @return always return ESP_OK.
  */
-esp_err_t adc1_lock_release();
+esp_err_t adc1_lock_release(void);
 
 #ifdef __cplusplus
 }

components/driver/can.c

@@ -141,7 +141,7 @@ static portMUX_TYPE can_spinlock = portMUX_INITIALIZER_UNLOCKED;
 
 /* ------------------- Configuration Register Functions---------------------- */
 
-static inline esp_err_t can_enter_reset_mode()
+static inline esp_err_t can_enter_reset_mode(void)
 {
     /* Enter reset mode (required to write to configuration registers). Reset mode
        also prevents all CAN activity on the current module and is automatically
@@ -151,7 +151,7 @@ static inline esp_err_t can_enter_reset_mode()
     return ESP_OK;
 }
 
-static inline esp_err_t can_exit_reset_mode()
+static inline esp_err_t can_exit_reset_mode(void)
 {
     /* Exiting reset mode will return the CAN module to operating mode. Reset mode
        must also be exited in order to trigger BUS-OFF recovery sequence. */
@@ -160,7 +160,7 @@ static inline esp_err_t can_exit_reset_mode()
     return ESP_OK;
 }
 
-static inline void can_config_pelican()
+static inline void can_config_pelican(void)
 {
     //Use PeliCAN address layout. Exposes extra registers
     CAN.clock_divider_reg.can_mode = 1;
@@ -286,23 +286,23 @@ static void can_set_tx_buffer_and_transmit(can_frame_t *frame)
     can_set_command(command);
 }
 
-static inline uint32_t can_get_status()
+static inline uint32_t can_get_status(void)
 {
     return CAN.status_reg.val;
 }
 
-static inline uint32_t can_get_interrupt_reason()
+static inline uint32_t can_get_interrupt_reason(void)
 {
     return CAN.interrupt_reg.val;
 }
 
-static inline uint32_t can_get_arbitration_lost_capture()
+static inline uint32_t can_get_arbitration_lost_capture(void)
 {
     return CAN.arbitration_lost_captue_reg.val;
     //Todo: ALC read only to re-arm arb lost interrupt. Add function to decode ALC
 }
 
-static inline uint32_t can_get_error_code_capture()
+static inline uint32_t can_get_error_code_capture(void)
 {
     return CAN.error_code_capture_reg.val;
     //Todo: ECC read only to re-arm bus error interrupt. Add function to decode ECC
@@ -328,7 +328,7 @@ static inline void can_get_rx_buffer_and_clear(can_frame_t *frame)
     can_set_command(CMD_RELEASE_RX_BUFF);
 }
 
-static inline uint32_t can_get_rx_message_counter()
+static inline uint32_t can_get_rx_message_counter(void)
 {
     return CAN.rx_message_counter_reg.val;
 }
@@ -725,7 +725,7 @@ esp_err_t can_driver_install(const can_general_config_t *g_config, const can_tim
     return ret;
 }
 
-esp_err_t can_driver_uninstall()
+esp_err_t can_driver_uninstall(void)
 {
     can_obj_t *p_can_obj_dummy;
 
@@ -761,7 +761,7 @@ esp_err_t can_driver_uninstall()
     return ESP_OK;
 }
 
-esp_err_t can_start()
+esp_err_t can_start(void)
 {
     //Check state
     CAN_ENTER_CRITICAL();
@@ -791,7 +791,7 @@ esp_err_t can_start()
     return ESP_OK;
 }
 
-esp_err_t can_stop()
+esp_err_t can_stop(void)
 {
     //Check state
     CAN_ENTER_CRITICAL();
@@ -928,7 +928,7 @@ esp_err_t can_reconfigure_alerts(uint32_t alerts_enabled, uint32_t *current_aler
     return ESP_OK;
 }
 
-esp_err_t can_initiate_recovery()
+esp_err_t can_initiate_recovery(void)
 {
     CAN_ENTER_CRITICAL();
     //Check state
@@ -982,7 +982,7 @@ esp_err_t can_get_status_info(can_status_info_t *status_info)
     return ESP_OK;
 }
 
-esp_err_t can_clear_transmit_queue()
+esp_err_t can_clear_transmit_queue(void)
 {
     //Check State
     CAN_CHECK(p_can_obj != NULL, ESP_ERR_INVALID_STATE);
@@ -997,7 +997,7 @@ esp_err_t can_clear_transmit_queue()
     return ESP_OK;
 }
 
-esp_err_t can_clear_receive_queue()
+esp_err_t can_clear_receive_queue(void)
 {
     //Check State
     CAN_CHECK(p_can_obj != NULL, ESP_ERR_INVALID_STATE);

components/driver/gpio.c

@@ -419,7 +419,7 @@ esp_err_t gpio_install_isr_service(int intr_alloc_flags)
     return ret;
 }
 
-void gpio_uninstall_isr_service()
+void gpio_uninstall_isr_service(void)
 {
     if (gpio_isr_func == NULL) {
         return;

components/driver/i2c.c

@@ -942,7 +942,7 @@ esp_err_t i2c_set_pin(i2c_port_t i2c_num, int sda_io_num, int scl_io_num, gpio_p
     return ESP_OK;
 }
 
-i2c_cmd_handle_t i2c_cmd_link_create()
+i2c_cmd_handle_t i2c_cmd_link_create(void)
 {
 #if !CONFIG_SPIRAM_USE_MALLOC
     i2c_cmd_desc_t* cmd_desc = (i2c_cmd_desc_t*) calloc(1, sizeof(i2c_cmd_desc_t));

components/driver/i2s.c

@@ -740,7 +740,7 @@ esp_err_t i2s_set_dac_mode(i2s_dac_mode_t dac_mode)
     return ESP_OK;
 }
 
-static esp_err_t _i2s_adc_mode_recover()
+static esp_err_t _i2s_adc_mode_recover(void)
 {
     I2S_CHECK(((_i2s_adc_unit != -1) && (_i2s_adc_channel != -1)), "i2s ADC recover error, not initialized...", ESP_ERR_INVALID_ARG);
     return adc_i2s_mode_init(_i2s_adc_unit, _i2s_adc_channel);

components/driver/include/driver/adc.h

@@ -229,13 +229,13 @@ int adc1_get_voltage(adc1_channel_t channel) __attribute__((deprecated));
 /**
  * @brief Enable ADC power
  */
-void adc_power_on();
+void adc_power_on(void);
 
 /**
  * @brief Power off SAR ADC
  * This function will force power down for ADC
  */
-void adc_power_off();
+void adc_power_off(void);
 
 /**
  * @brief Initialize ADC pad
@@ -292,7 +292,7 @@ esp_err_t adc_i2s_mode_init(adc_unit_t adc_unit, adc_channel_t channel);
  * Note that adc1_config_channel_atten, adc1_config_width functions need
  * to be called to configure ADC1 channels, before ADC1 is used by the ULP.
  */
-void adc1_ulp_enable();
+void adc1_ulp_enable(void);
 
 /**
  * @brief Read Hall Sensor
@@ -313,7 +313,7 @@ void adc1_ulp_enable();
  *
  * @return The hall sensor reading.
  */
-int hall_sensor_read();
+int hall_sensor_read(void);
 
 /**
  * @brief Get the gpio number of a specific ADC2 channel.

components/driver/include/driver/adc2_wifi_internal.h

@@ -31,7 +31,7 @@ extern "C" {
  *      - ESP_OK success
  *      - ESP_ERR_TIMEOUT reserved for future use. Currently the function will wait until success.
  */
-esp_err_t adc2_wifi_acquire();
+esp_err_t adc2_wifi_acquire(void);
 
 
 /**
@@ -42,7 +42,7 @@ esp_err_t adc2_wifi_acquire();
  *
  * @return always return ESP_OK.
  */
-esp_err_t adc2_wifi_release();
+esp_err_t adc2_wifi_release(void);
 
 #ifdef __cplusplus
 }

components/driver/include/driver/can.h

@@ -238,7 +238,7 @@ esp_err_t can_driver_install(const can_general_config_t *g_config, const can_tim
  *      - ESP_OK: Successfully uninstalled CAN driver
  *      - ESP_ERR_INVALID_STATE: Driver is not in stopped/bus-off state, or is not installed
  */
-esp_err_t can_driver_uninstall();
+esp_err_t can_driver_uninstall(void);
 
 /**
  * @brief   Start the CAN driver
@@ -253,7 +253,7 @@ esp_err_t can_driver_uninstall();
  *      - ESP_OK: CAN driver is now running
  *      - ESP_ERR_INVALID_STATE: Driver is not in stopped state, or is not installed
  */
-esp_err_t can_start();
+esp_err_t can_start(void);
 
 /**
  * @brief   Stop the CAN driver
@@ -272,7 +272,7 @@ esp_err_t can_start();
  *      - ESP_OK: CAN driver is now Stopped
  *      - ESP_ERR_INVALID_STATE: Driver is not in running state, or is not installed
  */
-esp_err_t can_stop();
+esp_err_t can_stop(void);
 
 /**
  * @brief   Transmit a CAN message
@@ -379,7 +379,7 @@ esp_err_t can_reconfigure_alerts(uint32_t alerts_enabled, uint32_t *current_aler
  *      - ESP_OK: Bus recovery started
  *      - ESP_ERR_INVALID_STATE: CAN driver is not in the bus-off state, or is not installed
  */
-esp_err_t can_initiate_recovery();
+esp_err_t can_initiate_recovery(void);
 
 /**
  * @brief   Get current status information of the CAN driver
@@ -405,7 +405,7 @@ esp_err_t can_get_status_info(can_status_info_t *status_info);
  *      - ESP_OK: Transmit queue cleared
  *      - ESP_ERR_INVALID_STATE: CAN driver is not installed or TX queue is disabled
  */
-esp_err_t can_clear_transmit_queue();
+esp_err_t can_clear_transmit_queue(void);
 
 /**
  * @brief   Clear the receive queue
@@ -419,7 +419,7 @@ esp_err_t can_clear_transmit_queue();
  *      - ESP_OK: Transmit queue cleared
  *      - ESP_ERR_INVALID_STATE: CAN driver is not installed
  */
-esp_err_t can_clear_receive_queue();
+esp_err_t can_clear_receive_queue(void);
 
 #ifdef __cplusplus
 }

components/driver/include/driver/dac.h

@@ -99,12 +99,12 @@ esp_err_t dac_output_disable(dac_channel_t channel);
 /**
  * @brief Enable DAC output data from I2S
  */
-esp_err_t dac_i2s_enable();
+esp_err_t dac_i2s_enable(void);
 
 /**
  * @brief Disable DAC output data from I2S
  */
-esp_err_t dac_i2s_disable();
+esp_err_t dac_i2s_disable(void);
 #ifdef __cplusplus
 }
 #endif

components/driver/include/driver/gpio.h

@@ -475,7 +475,7 @@ esp_err_t gpio_install_isr_service(int intr_alloc_flags);
 /**
   * @brief Uninstall the driver's GPIO ISR service, freeing related resources.
   */
-void gpio_uninstall_isr_service();
+void gpio_uninstall_isr_service(void);
 
 /**
   * @brief Add ISR handler for the corresponding GPIO pin.

components/driver/include/driver/i2c.h

@@ -224,7 +224,7 @@ esp_err_t i2c_set_pin(i2c_port_t i2c_num, int sda_io_num, int scl_io_num,
  *
  * @return i2c command link handler
  */
-i2c_cmd_handle_t i2c_cmd_link_create();
+i2c_cmd_handle_t i2c_cmd_link_create(void);
 
 /**
  * @brief Free I2C command link

components/driver/include/driver/ledc.h

@@ -435,7 +435,7 @@ esp_err_t ledc_fade_func_install(int intr_alloc_flags);
  * @brief Uninstall LEDC fade function.
  *
  */
-void ledc_fade_func_uninstall();
+void ledc_fade_func_uninstall(void);
 
 /**
  * @brief Start LEDC fading.

components/driver/include/driver/rtc_io.h

@@ -219,7 +219,7 @@ esp_err_t rtc_gpio_isolate(gpio_num_t gpio_num);
  * Force hold signal is enabled before going into deep sleep for pins which
  * are used for EXT1 wakeup.
  */
-void rtc_gpio_force_hold_dis_all();
+void rtc_gpio_force_hold_dis_all(void);
 
 /**
  * @brief Set RTC GPIO pad drive capability

components/driver/include/driver/sdio_slave.h

@@ -111,7 +111,7 @@ esp_err_t sdio_slave_initialize(sdio_slave_config_t *config);
 
 /** De-initialize the sdio slave driver to release the resources.
  */
-void sdio_slave_deinit();
+void sdio_slave_deinit(void);
 
 /** Start hardware for sending and receiving, as well as set the IOREADY1 to 1.
  *
@@ -122,19 +122,19 @@ void sdio_slave_deinit();
  *  - ESP_ERR_INVALID_STATE if already started.
  *  - ESP_OK otherwise.
  */
-esp_err_t sdio_slave_start();
+esp_err_t sdio_slave_start(void);
 
 /** Stop hardware from sending and receiving, also set IOREADY1 to 0.
  *
  * @note this will not clear the data already in the driver, and also not reset the PKT_LEN and TOKEN1 counting. Call ``sdio_slave_reset`` to do that.
  */
-void sdio_slave_stop();
+void sdio_slave_stop(void);
 
 /** Clear the data still in the driver, as well as reset the PKT_LEN and TOKEN1 counting.
  *
  * @return always return ESP_OK.
  */
-esp_err_t sdio_slave_reset();
+esp_err_t sdio_slave_reset(void);
 
 /*---------------------------------------------------------------------------
  *                  Receive
@@ -263,7 +263,7 @@ esp_err_t sdio_slave_write_reg(int pos, uint8_t reg);
  *
  * @return the interrupt mask.
  */
-sdio_slave_hostint_t sdio_slave_get_host_intena();
+sdio_slave_hostint_t sdio_slave_get_host_intena(void);
 
 /** Set the interrupt enable for host.
  *

components/driver/include/driver/sdmmc_host.h

@@ -91,7 +91,7 @@ typedef struct {
  *      - ESP_ERR_INVALID_STATE if sdmmc_host_init was already called
  *      - ESP_ERR_NO_MEM if memory can not be allocated
  */
-esp_err_t sdmmc_host_init();
+esp_err_t sdmmc_host_init(void);
 
 /**
  * @brief Initialize given slot of SDMMC peripheral
@@ -218,7 +218,7 @@ esp_err_t sdmmc_host_io_int_wait(int slot, TickType_t timeout_ticks);
  *      - ESP_OK on success
  *      - ESP_ERR_INVALID_STATE if sdmmc_host_init function has not been called
  */
-esp_err_t sdmmc_host_deinit();
+esp_err_t sdmmc_host_deinit(void);
 
 /**
  * @brief Enable the pull-ups of sd pins.

components/driver/include/driver/sdspi_host.h

@@ -91,7 +91,7 @@ typedef struct {
  *      - ESP_OK on success
  *      - other error codes may be returned in future versions
  */
-esp_err_t sdspi_host_init();
+esp_err_t sdspi_host_init(void);
 
 /**
 * @brief Initialize SD SPI driver for the specific SPI controller
@@ -159,7 +159,7 @@ esp_err_t sdspi_host_set_card_clk(int slot, uint32_t freq_khz);
  *      - ESP_OK on success
  *      - ESP_ERR_INVALID_STATE if sdspi_host_init function has not been called
  */
-esp_err_t sdspi_host_deinit();
+esp_err_t sdspi_host_deinit(void);
 
 /**
  * @brief Enable SDIO interrupt.

components/driver/include/driver/spi_common.h

@@ -381,7 +381,7 @@ bool spicommon_dmaworkaround_req_reset(int dmachan, dmaworkaround_cb_t cb, void
  *
  * @return True when a DMA reset is requested but hasn't completed yet. False otherwise.
  */
-bool spicommon_dmaworkaround_reset_in_progress();
+bool spicommon_dmaworkaround_reset_in_progress(void);
 
 
 /**

components/driver/include/driver/touch_pad.h

@@ -117,7 +117,7 @@ typedef intr_handle_t touch_isr_handle_t;
  *     - ESP_OK Success
  *     - ESP_FAIL Touch pad init error
  */
-esp_err_t touch_pad_init();
+esp_err_t touch_pad_init(void);
 
 /**
  * @brief Un-install touch pad driver.
@@ -126,7 +126,7 @@ esp_err_t touch_pad_init();
  *     - ESP_OK   Success
  *     - ESP_FAIL Touch pad driver not initialized
  */
-esp_err_t touch_pad_deinit();
+esp_err_t touch_pad_deinit(void);
 
 /**
  * @brief Configure touch pad interrupt threshold.
@@ -364,7 +364,7 @@ esp_err_t touch_pad_get_fsm_mode(touch_fsm_mode_t *mode);
  * @return
  *      - ESP_OK on success
  */
-esp_err_t touch_pad_sw_start();
+esp_err_t touch_pad_sw_start(void);
 
 /**
  * @brief Set touch sensor interrupt threshold
@@ -468,28 +468,28 @@ esp_err_t touch_pad_clear_group_mask(uint16_t set1_mask, uint16_t set2_mask, uin
  * @return
  *      - ESP_OK on success
  */
-esp_err_t touch_pad_clear_status();
+esp_err_t touch_pad_clear_status(void);
 
 /**
  * @brief Get the touch sensor status, usually used in ISR to decide which pads are 'touched'.
  * @return
  *      - touch status
  */
-uint32_t touch_pad_get_status();
+uint32_t touch_pad_get_status(void);
 
 /**
  * @brief To enable touch pad interrupt
  * @return
  *      - ESP_OK on success
  */
-esp_err_t touch_pad_intr_enable();
+esp_err_t touch_pad_intr_enable(void);
 
 /**
  * @brief To disable touch pad interrupt
  * @return
  *      - ESP_OK on success
  */
-esp_err_t touch_pad_intr_disable();
+esp_err_t touch_pad_intr_disable(void);
 
 /**
  * @brief set touch pad filter calibration period, in ms.
@@ -539,7 +539,7 @@ esp_err_t touch_pad_filter_start(uint32_t filter_period_ms);
  *      - ESP_OK Success
  *      - ESP_ERR_INVALID_STATE driver state error
  */
-esp_err_t touch_pad_filter_stop();
+esp_err_t touch_pad_filter_stop(void);
 
 /**
  * @brief delete touch pad filter driver and release the memory
@@ -548,7 +548,7 @@ esp_err_t touch_pad_filter_stop();
  *      - ESP_OK Success
  *      - ESP_ERR_INVALID_STATE driver state error
  */
-esp_err_t touch_pad_filter_delete();
+esp_err_t touch_pad_filter_delete(void);
 
 /**
  * @brief Get the touch pad which caused wakeup from sleep

components/driver/include/driver/uart_select.h

@@ -40,7 +40,7 @@ void uart_set_select_notif_callback(uart_port_t uart_num, uart_select_notif_call
 /**
  * @brief Get mutex guarding select() notifications
  */
-portMUX_TYPE *uart_get_selectlock();
+portMUX_TYPE *uart_get_selectlock(void);
 
 #ifdef __cplusplus
 }

components/driver/ledc.c

@@ -712,7 +712,7 @@ esp_err_t ledc_fade_func_install(int intr_alloc_flags)
     return ledc_isr_register(ledc_fade_isr, NULL, intr_alloc_flags | ESP_INTR_FLAG_IRAM, &s_ledc_fade_isr_handle);
 }
 
-void ledc_fade_func_uninstall()
+void ledc_fade_func_uninstall(void)
 {
     if (s_ledc_fade_rec == NULL) {
         return;

components/driver/rmt.c

@@ -321,7 +321,7 @@ esp_err_t rmt_get_status(rmt_channel_t channel, uint32_t* status)
     return ESP_OK;
 }
 
-rmt_data_mode_t rmt_get_data_mode()
+rmt_data_mode_t rmt_get_data_mode(void)
 {
     return (rmt_data_mode_t) (RMT.apb_conf.fifo_mask);
 }

components/driver/rtc_module.c

@@ -368,7 +368,7 @@ esp_err_t rtc_gpio_isolate(gpio_num_t gpio_num)
     return ESP_OK;
 }
 
-void rtc_gpio_force_hold_dis_all()
+void rtc_gpio_force_hold_dis_all(void)
 {
     for (int gpio = 0; gpio < GPIO_PIN_COUNT; ++gpio) {
         const rtc_gpio_desc_t* desc = &rtc_gpio_desc[gpio];
@@ -657,7 +657,7 @@ esp_err_t touch_pad_get_fsm_mode(touch_fsm_mode_t *mode)
     return ESP_OK;
 }
 
-esp_err_t touch_pad_sw_start()
+esp_err_t touch_pad_sw_start(void)
 {
     portENTER_CRITICAL(&rtc_spinlock);
     SENS.sar_touch_ctrl2.touch_start_en = 0;
@@ -772,13 +772,13 @@ esp_err_t touch_pad_clear_group_mask(uint16_t set1_mask, uint16_t set2_mask, uin
     return ESP_OK;
 }
 
-uint32_t IRAM_ATTR touch_pad_get_status()
+uint32_t IRAM_ATTR touch_pad_get_status(void)
 {
     uint32_t status = SENS.sar_touch_ctrl2.touch_meas_en;
     return TOUCH_BITS_SWAP(status);
 }
 
-esp_err_t IRAM_ATTR touch_pad_clear_status()
+esp_err_t IRAM_ATTR touch_pad_clear_status(void)
 {
     portENTER_CRITICAL(&rtc_spinlock);
     SENS.sar_touch_ctrl2.touch_meas_en_clr = 1;
@@ -786,7 +786,7 @@ esp_err_t IRAM_ATTR touch_pad_clear_status()
     return ESP_OK;
 }
 
-esp_err_t touch_pad_intr_enable()
+esp_err_t touch_pad_intr_enable(void)
 {
     portENTER_CRITICAL(&rtc_spinlock);
     RTCCNTL.int_ena.rtc_touch = 1;
@@ -794,7 +794,7 @@ esp_err_t touch_pad_intr_enable()
     return ESP_OK;
 }
 
-esp_err_t touch_pad_intr_disable()
+esp_err_t touch_pad_intr_disable(void)
 {
     portENTER_CRITICAL(&rtc_spinlock);
     RTCCNTL.int_ena.rtc_touch = 0;
@@ -834,7 +834,7 @@ esp_err_t touch_pad_config(touch_pad_t touch_num, uint16_t threshold)
     return ESP_OK;
 }
 
-esp_err_t touch_pad_init()
+esp_err_t touch_pad_init(void)
 {
     if (rtc_touch_mux == NULL) {
         rtc_touch_mux = xSemaphoreCreateMutex();
@@ -852,7 +852,7 @@ esp_err_t touch_pad_init()
     return ESP_OK;
 }
 
-esp_err_t touch_pad_deinit()
+esp_err_t touch_pad_deinit(void)
 {
     RTC_MODULE_CHECK(rtc_touch_mux != NULL, "Touch pad not initialized", ESP_FAIL);
     if (s_touch_pad_filter != NULL) {
@@ -1006,7 +1006,7 @@ err_no_mem:
     return ESP_ERR_NO_MEM;
 }
 
-esp_err_t touch_pad_filter_stop()
+esp_err_t touch_pad_filter_stop(void)
 {
     RTC_MODULE_CHECK(s_touch_pad_filter != NULL, "Touch pad filter not initialized", ESP_ERR_INVALID_STATE);
     RTC_MODULE_CHECK(rtc_touch_mux != NULL, "Touch pad not initialized", ESP_ERR_INVALID_STATE);
@@ -1022,7 +1022,7 @@ esp_err_t touch_pad_filter_stop()
     return ret;
 }
 
-esp_err_t touch_pad_filter_delete()
+esp_err_t touch_pad_filter_delete(void)
 {
     RTC_MODULE_CHECK(s_touch_pad_filter != NULL, "Touch pad filter not initialized", ESP_ERR_INVALID_STATE);
     RTC_MODULE_CHECK(rtc_touch_mux != NULL, "Touch pad not initialized", ESP_ERR_INVALID_STATE);
@@ -1143,14 +1143,14 @@ static esp_err_t adc_set_atten(adc_unit_t adc_unit, adc_channel_t channel, adc_a
     return ESP_OK;
 }
 
-void adc_power_always_on()
+void adc_power_always_on(void)
 {
     portENTER_CRITICAL(&rtc_spinlock);
     SENS.sar_meas_wait2.force_xpd_sar = SENS_FORCE_XPD_SAR_PU;
     portEXIT_CRITICAL(&rtc_spinlock);
 }
 
-void adc_power_on()
+void adc_power_on(void)
 {
     portENTER_CRITICAL(&rtc_spinlock);
     //The power FSM controlled mode saves more power, while the ADC noise may get increased.
@@ -1168,7 +1168,7 @@ void adc_power_on()
     portEXIT_CRITICAL(&rtc_spinlock);
 }
 
-void adc_power_off()
+void adc_power_off(void)
 {
     portENTER_CRITICAL(&rtc_spinlock);
     //Bit1  0:Fsm  1: SW mode
@@ -1474,7 +1474,7 @@ esp_err_t adc1_config_width(adc_bits_width_t width_bit)
     return ESP_OK;
 }
 
-static inline void adc1_fsm_disable()
+static inline void adc1_fsm_disable(void)
 {
     //channel is set in the  convert function
     SENS.sar_meas_wait2.force_xpd_amp = SENS_FORCE_XPD_AMP_PD;
@@ -1487,7 +1487,7 @@ static inline void adc1_fsm_disable()
     SENS.sar_meas_wait2.sar_amp_wait3 = 1;    
 }
 
-esp_err_t adc1_i2s_mode_acquire()
+esp_err_t adc1_i2s_mode_acquire(void)
 {
     //lazy initialization
     //for i2s, block until acquire the lock
@@ -1501,7 +1501,7 @@ esp_err_t adc1_i2s_mode_acquire()
     return ESP_OK;
 }
 
-esp_err_t adc1_adc_mode_acquire()
+esp_err_t adc1_adc_mode_acquire(void)
 {
     //lazy initialization
     //for adc1, block until acquire the lock
@@ -1517,7 +1517,7 @@ esp_err_t adc1_adc_mode_acquire()
     return ESP_OK;
 }
 
-esp_err_t adc1_lock_release()
+esp_err_t adc1_lock_release(void)
 {
     RTC_MODULE_CHECK((uint32_t*)adc1_i2s_lock != NULL, "adc1 lock release called before acquire", ESP_ERR_INVALID_STATE );
     // for now the WiFi would use ADC2 and set xpd_sar force on.
@@ -1548,7 +1548,7 @@ int adc1_get_raw(adc1_channel_t channel)
     return adc_value;
 }
 
-int adc1_get_voltage(adc1_channel_t channel)    //Deprecated. Use adc1_get_raw() instead
+int adc1_get_voltage(adc1_channel_t channel)    //Deprecated. Use adc1_get_raw(void) instead
 {
     return adc1_get_raw(channel);
 }
@@ -1611,7 +1611,7 @@ esp_err_t adc2_pad_get_io_num(adc2_channel_t channel, gpio_num_t *gpio_num)
     return ESP_OK;
 }
 
-esp_err_t adc2_wifi_acquire()
+esp_err_t adc2_wifi_acquire(void)
 {
     //lazy initialization
     //for wifi, block until acquire the lock
@@ -1620,7 +1620,7 @@ esp_err_t adc2_wifi_acquire()
     return ESP_OK;
 }
 
-esp_err_t adc2_wifi_release()
+esp_err_t adc2_wifi_release(void)
 {
     RTC_MODULE_CHECK((uint32_t*)adc2_wifi_lock != NULL, "wifi release called before acquire", ESP_ERR_INVALID_STATE );
 
@@ -1878,7 +1878,7 @@ esp_err_t dac_out_voltage(dac_channel_t channel, uint8_t dac_value)
     return ESP_OK;
 }
 
-esp_err_t dac_i2s_enable()
+esp_err_t dac_i2s_enable(void)
 {
     portENTER_CRITICAL(&rtc_spinlock);
     SET_PERI_REG_MASK(SENS_SAR_DAC_CTRL1_REG, SENS_DAC_DIG_FORCE_M | SENS_DAC_CLK_INV_M);
@@ -1886,7 +1886,7 @@ esp_err_t dac_i2s_enable()
     return ESP_OK;
 }
 
-esp_err_t dac_i2s_disable()
+esp_err_t dac_i2s_disable(void)
 {
     portENTER_CRITICAL(&rtc_spinlock);
     CLEAR_PERI_REG_MASK(SENS_SAR_DAC_CTRL1_REG, SENS_DAC_DIG_FORCE_M | SENS_DAC_CLK_INV_M);
@@ -1903,7 +1903,7 @@ static inline void adc1_hall_enable(bool enable)
     RTCIO.hall_sens.xpd_hall = enable;        
 }
 
-static int hall_sensor_get_value()    //hall sensor without LNA
+static int hall_sensor_get_value(void)    //hall sensor without LNA
 {
     int Sens_Vp0;
     int Sens_Vn0;
@@ -1932,7 +1932,7 @@ static int hall_sensor_get_value()    //hall sensor without LNA
     return hall_value;
 }
 
-int hall_sensor_read()
+int hall_sensor_read(void)
 {
     adc_gpio_init(ADC_UNIT_1, ADC1_CHANNEL_0);
     adc_gpio_init(ADC_UNIT_1, ADC1_CHANNEL_3);
@@ -1974,7 +1974,7 @@ static void rtc_isr(void* arg)
     REG_WRITE(RTC_CNTL_INT_CLR_REG, status);
 }
 
-static esp_err_t rtc_isr_ensure_installed()
+static esp_err_t rtc_isr_ensure_installed(void)
 {
     esp_err_t err = ESP_OK;
     portENTER_CRITICAL(&s_rtc_isr_handler_list_lock);

components/driver/sdio_slave.c

@@ -215,17 +215,17 @@ static void sdio_intr_host(void*);
 static void sdio_intr_send(void*);
 static void sdio_intr_recv(void*);
 
-static esp_err_t send_flush_data();
+static esp_err_t send_flush_data(void);
-static esp_err_t send_reset_counter();
+static esp_err_t send_reset_counter(void);
-static void recv_flush_data();
+static void recv_flush_data(void);
-static void recv_reset_counter();
+static void recv_reset_counter(void);
 
-static esp_err_t send_start();
+static esp_err_t send_start(void);
-static void send_stop();
+static void send_stop(void);
-static esp_err_t recv_start();
+static esp_err_t recv_start(void);
-static void recv_stop();
+static void recv_stop(void);
 
-static void deinit_context();
+static void deinit_context(void);
 
 
 /**************** Ring buffer for SDIO use *****************/
@@ -395,7 +395,7 @@ static void __attribute((unused)) dump_ll(lldesc_t *queue)
     ESP_EARLY_LOGI(TAG, "total: %d", cnt);
 }
 
-static inline void deinit_context()
+static inline void deinit_context(void)
 {
     context.config = (sdio_slave_config_t){};
     for(int i = 0; i < 9; i++) {
@@ -417,7 +417,7 @@ esp_err_t link_desc_to_last(uint8_t* desc, void* arg)
     return ESP_OK;
 }
 
-static esp_err_t init_ringbuf()
+static esp_err_t init_ringbuf(void)
 {
     esp_err_t ret = sdio_ringbuf_init(&context.sendbuf, sizeof(buf_desc_t), context.config.send_queue_size);
     if (ret != ESP_OK) return ret;
@@ -591,7 +591,7 @@ esp_err_t sdio_slave_initialize(sdio_slave_config_t *config)
     return ESP_OK;
 }
 
-void sdio_slave_deinit()
+void sdio_slave_deinit(void)
 {
     esp_err_t ret = esp_intr_free(context.intr_handle);
     assert(ret==ESP_OK);
@@ -599,7 +599,7 @@ void sdio_slave_deinit()
     deinit_context();
 }
 
-esp_err_t sdio_slave_start()
+esp_err_t sdio_slave_start(void)
 {
     esp_err_t ret;
     HOST.slc0_int_clr.val = UINT32_MAX;//clear all interrupts
@@ -611,7 +611,7 @@ esp_err_t sdio_slave_start()
     return ESP_OK;
 }
 
-esp_err_t sdio_slave_reset()
+esp_err_t sdio_slave_reset(void)
 {
     send_flush_data();
     send_reset_counter();
@@ -620,7 +620,7 @@ esp_err_t sdio_slave_reset()
     return ESP_OK;
 }
 
-void sdio_slave_stop()
+void sdio_slave_stop(void)
 {
     HINF.cfg_data1.sdio_ioready1 = 0;   //set IO ready to 1 to stop host from using
     send_stop();
@@ -696,7 +696,7 @@ esp_err_t sdio_slave_write_reg(int pos, uint8_t reg)
     return ESP_OK;
 }
 
-sdio_slave_hostint_t sdio_slave_get_host_intena()
+sdio_slave_hostint_t sdio_slave_get_host_intena(void)
 {
     return HOST.slc0_func1_int_ena.val;
 }
@@ -742,12 +742,12 @@ static inline void send_start_transmission(const void* desc)
     SLC.slc0_rx_link.start = 1;
 }
 
-static inline void send_stop_ll_operation()
+static inline void send_stop_ll_operation(void)
 {
     SLC.slc0_rx_link.stop = 1;
 }
 
-static inline uint32_t send_length_read()
+static inline uint32_t send_length_read(void)
 {
     return HOST.pkt_len.reg_slc0_len;
 }
@@ -760,7 +760,7 @@ DMA_ATTR static const buf_desc_t start_desc = {
     .eof = 1,
 };
 
-static inline void send_isr_invoker_enable()
+static inline void send_isr_invoker_enable(void)
 {
     //force trigger rx_done interrupt. the interrupt is abused to invoke ISR from the app by the enable bit and never cleared.
     send_start_transmission(&start_desc);
@@ -770,29 +770,29 @@ static inline void send_isr_invoker_enable()
     send_stop_ll_operation();
 }
 
-static inline void send_isr_invoker_disable()
+static inline void send_isr_invoker_disable(void)
 {
     SLC.slc0_int_clr.rx_done = 1;
 }
 
-static inline void send_intr_enable()
+static inline void send_intr_enable(void)
 {
     SLC.slc0_int_ena.rx_eof = 1;
     send_isr_invoker_enable();
 }
 
-static inline void send_intr_disable()
+static inline void send_intr_disable(void)
 {
     send_isr_invoker_disable();
     SLC.slc0_int_ena.rx_eof = 0;
 }
 
-static inline void send_isr_invoke()
+static inline void send_isr_invoke(void)
 {
     SLC.slc0_int_ena.rx_done = 1;
 }
 
-static inline send_state_t send_get_state()
+static inline send_state_t send_get_state(void)
 {
     return context.send_state;
 }
@@ -803,7 +803,7 @@ static inline void send_set_state(send_state_t state)
 }
 
 //start hw operation with existing data (if exist)
-static esp_err_t send_start()
+static esp_err_t send_start(void)
 {
     SDIO_SLAVE_CHECK(send_get_state() == STATE_IDLE,
         "already started", ESP_ERR_INVALID_STATE);
@@ -814,7 +814,7 @@ static esp_err_t send_start()
 }
 
 //only stop hw operations, no touch to data as well as counter
-static void send_stop()
+static void send_stop(void)
 {
     SLC.slc0_rx_link.stop = 1;
     send_intr_disable();
@@ -866,7 +866,7 @@ static inline esp_err_t send_isr_check_new_pkt(portBASE_TYPE *yield)
     return ESP_OK;
 }
 
-static inline esp_err_t send_isr_new_packet()
+static inline esp_err_t send_isr_new_packet(void)
 {
     // since eof is changed, we have to stop and reset the link list,
     // and restart new link list operation
@@ -973,7 +973,7 @@ esp_err_t sdio_slave_transmit(uint8_t* addr, size_t len)
 }
 
 //clear data but keep counter
-static esp_err_t send_flush_data()
+static esp_err_t send_flush_data(void)
 {
     //only works in idle state / wait to send state
     SDIO_SLAVE_CHECK(send_get_state() == STATE_IDLE,
@@ -1019,7 +1019,7 @@ static esp_err_t send_flush_data()
 }
 
 //clear counter but keep data
-static esp_err_t send_reset_counter()
+static esp_err_t send_reset_counter(void)
 {
     SDIO_SLAVE_CHECK(send_get_state() == STATE_IDLE,
         "reset counter when transmission started", ESP_ERR_INVALID_STATE);
@@ -1061,28 +1061,28 @@ static esp_err_t send_reset_counter()
 #define CHECK_HANDLE_IDLE(desc) do { if (desc == NULL || !desc->not_receiving) {\
     return ESP_ERR_INVALID_ARG; } } while(0)
 
-static inline void critical_enter_recv()
+static inline void critical_enter_recv(void)
 {
     portENTER_CRITICAL(&context.recv_spinlock);
 }
 
-static inline void critical_exit_recv()
+static inline void critical_exit_recv(void)
 {
     portEXIT_CRITICAL(&context.recv_spinlock);
 }
 
-static inline void recv_size_inc()
+static inline void recv_size_inc(void)
 {
     // fields wdata and inc_more should be written by the same instruction.
     SLC.slc0_token1.val = FIELD_TO_VALUE2(SLC_SLC0_TOKEN1_WDATA, 1) | FIELD_TO_VALUE2(SLC_SLC0_TOKEN1_INC_MORE, 1);
 }
 
-static inline void recv_size_reset()
+static inline void recv_size_reset(void)
 {
     SLC.slc0_token1.val = FIELD_TO_VALUE2(SLC_SLC0_TOKEN1_WDATA, 0) | FIELD_TO_VALUE2(SLC_SLC0_TOKEN1_WR, 1);
 }
 
-static inline buf_desc_t* recv_get_first_empty_buf()
+static inline buf_desc_t* recv_get_first_empty_buf(void)
 {
     buf_stailq_t *const queue = &context.recv_link_list;
     buf_desc_t *desc = STAILQ_FIRST(queue);
@@ -1092,7 +1092,7 @@ static inline buf_desc_t* recv_get_first_empty_buf()
     return desc;
 }
 
-static esp_err_t recv_start()
+static esp_err_t recv_start(void)
 {
     SLC.conf0.slc0_tx_rst = 1;
     SLC.conf0.slc0_tx_rst = 0;
@@ -1113,14 +1113,14 @@ static esp_err_t recv_start()
     return ESP_OK;
 }
 
-static void recv_stop()
+static void recv_stop(void)
 {
     SLC.slc0_tx_link.stop = 1;
     SLC.slc0_int_ena.tx_done = 0;
 }
 
 // reset the counter, but keep the data
-static void recv_reset_counter()
+static void recv_reset_counter(void)
 {
     recv_size_reset();
 
@@ -1135,7 +1135,7 @@ static void recv_reset_counter()
 }
 
 // remove data, still increase the counter
-static void recv_flush_data()
+static void recv_flush_data(void)
 {
     buf_stailq_t *const queue = &context.recv_link_list;
 
@@ -1276,7 +1276,7 @@ uint8_t* sdio_slave_recv_get_buf(sdio_slave_buf_handle_t handle, size_t *len_o)
     return desc->buf;
 }
 
-static void __attribute((unused)) sdio_slave_recv_get_loaded_buffer_num()
+static void __attribute((unused)) sdio_slave_recv_get_loaded_buffer_num(void)
 {
     buf_stailq_t *const queue = &context.recv_link_list;
     dump_queue(queue);

components/driver/sdmmc_host.c

@@ -30,7 +30,7 @@
 
 
 static void sdmmc_isr(void* arg);
-static void sdmmc_host_dma_init();
+static void sdmmc_host_dma_init(void);
 
 
 static const char* TAG = "sdmmc_periph";
@@ -40,7 +40,7 @@ static SemaphoreHandle_t s_io_intr_event;
 
 size_t s_slot_width[2] = {1,1};
 
-void sdmmc_host_reset()
+void sdmmc_host_reset(void)
 {
     // Set reset bits
     SDMMC.ctrl.controller_reset = 1;
@@ -97,7 +97,7 @@ static void sdmmc_host_set_clk_div(int div)
     ets_delay_us(10);
 }
 
-static void sdmmc_host_input_clk_disable()
+static void sdmmc_host_input_clk_disable(void)
 {
     SDMMC.clock.val = 0;
 }
@@ -216,7 +216,7 @@ esp_err_t sdmmc_host_start_command(int slot, sdmmc_hw_cmd_t cmd, uint32_t arg) {
     return ESP_OK;
 }
 
-esp_err_t sdmmc_host_init()
+esp_err_t sdmmc_host_init(void)
 {
     if (s_intr_handle) {
         return ESP_ERR_INVALID_STATE;
@@ -402,7 +402,7 @@ esp_err_t sdmmc_host_init_slot(int slot, const sdmmc_slot_config_t* slot_config)
     return ESP_OK;
 }
 
-esp_err_t sdmmc_host_deinit()
+esp_err_t sdmmc_host_deinit(void)
 {
     if (!s_intr_handle) {
         return ESP_ERR_INVALID_STATE;
@@ -490,7 +490,7 @@ esp_err_t sdmmc_host_set_bus_ddr_mode(int slot, bool ddr_enabled)
     return ESP_OK;
 }
 
-static void sdmmc_host_dma_init()
+static void sdmmc_host_dma_init(void)
 {
     SDMMC.ctrl.dma_enable = 1;
     SDMMC.bmod.val = 0;
@@ -501,7 +501,7 @@ static void sdmmc_host_dma_init()
 }
 
 
-void sdmmc_host_dma_stop()
+void sdmmc_host_dma_stop(void)
 {
     SDMMC.ctrl.use_internal_dma = 0;
     SDMMC.ctrl.dma_reset = 1;
@@ -524,12 +524,12 @@ void sdmmc_host_dma_prepare(sdmmc_desc_t* desc, size_t block_size, size_t data_s
     sdmmc_host_dma_resume();
 }
 
-void sdmmc_host_dma_resume()
+void sdmmc_host_dma_resume(void)
 {
     SDMMC.pldmnd = 1;
 }
 
-bool sdmmc_host_card_busy()
+bool sdmmc_host_card_busy(void)
 {
     return SDMMC.status.data_busy == 1;
 }

components/driver/sdmmc_private.h

@@ -26,7 +26,7 @@ typedef struct {
     uint32_t dma_status;        ///< masked DMA interrupt status
 } sdmmc_event_t;
 
-void sdmmc_host_reset();
+void sdmmc_host_reset(void);
 
 esp_err_t sdmmc_host_start_command(int slot, sdmmc_hw_cmd_t cmd, uint32_t arg);
 
@@ -34,13 +34,13 @@ esp_err_t sdmmc_host_wait_for_event(int tick_count, sdmmc_event_t* out_event);
 
 void sdmmc_host_dma_prepare(sdmmc_desc_t* desc, size_t block_size, size_t data_size);
 
-void sdmmc_host_dma_stop();
+void sdmmc_host_dma_stop(void);
 
-void sdmmc_host_dma_resume();
+void sdmmc_host_dma_resume(void);
 
-bool sdmmc_host_card_busy();
+bool sdmmc_host_card_busy(void);
 
-esp_err_t sdmmc_host_transaction_handler_init();
+esp_err_t sdmmc_host_transaction_handler_init(void);
 
-void sdmmc_host_transaction_handler_deinit();
+void sdmmc_host_transaction_handler_deinit(void);
 

components/driver/sdmmc_transaction.c

@@ -72,7 +72,7 @@ static bool s_is_app_cmd;   // This flag is set if the next command is an APP co
 static esp_pm_lock_handle_t s_pm_lock;
 #endif
 
-static esp_err_t handle_idle_state_events();
+static esp_err_t handle_idle_state_events(void);
 static sdmmc_hw_cmd_t make_hw_cmd(sdmmc_command_t* cmd);
 static esp_err_t handle_event(sdmmc_command_t* cmd, sdmmc_req_state_t* state,
         sdmmc_event_t* unhandled_events);
@@ -80,10 +80,10 @@ static esp_err_t process_events(sdmmc_event_t evt, sdmmc_command_t* cmd,
         sdmmc_req_state_t* pstate, sdmmc_event_t* unhandled_events);
 static void process_command_response(uint32_t status, sdmmc_command_t* cmd);
 static void fill_dma_descriptors(size_t num_desc);
-static size_t get_free_descriptors_count();
+static size_t get_free_descriptors_count(void);
 static bool wait_for_busy_cleared(int timeout_ms);
 
-esp_err_t sdmmc_host_transaction_handler_init()
+esp_err_t sdmmc_host_transaction_handler_init(void)
 {
     assert(s_request_mutex == NULL);
     s_request_mutex = xSemaphoreCreateMutex();
@@ -102,7 +102,7 @@ esp_err_t sdmmc_host_transaction_handler_init()
     return ESP_OK;
 }
 
-void sdmmc_host_transaction_handler_deinit()
+void sdmmc_host_transaction_handler_deinit(void)
 {
     assert(s_request_mutex);
 #ifdef CONFIG_PM_ENABLE
@@ -182,7 +182,7 @@ out:
     return ret;
 }
 
-static size_t get_free_descriptors_count()
+static size_t get_free_descriptors_count(void)
 {
     const size_t next = s_cur_transfer.next_desc;
     size_t count = 0;
@@ -234,7 +234,7 @@ static void fill_dma_descriptors(size_t num_desc)
     }
 }
 
-static esp_err_t handle_idle_state_events()
+static esp_err_t handle_idle_state_events(void)
 {
     /* Handle any events which have happened in between transfers.
      * Under current assumptions (no SDIO support) only card detect events

components/driver/sdspi_host.c

@@ -225,12 +225,12 @@ static esp_err_t init_spi_dev(int slot, int clock_speed_hz)
     return spi_bus_add_device((spi_host_device_t) slot, &devcfg, &s_slots[slot].handle);
 }
 
-esp_err_t sdspi_host_init()
+esp_err_t sdspi_host_init(void)
 {
     return ESP_OK;
 }
 
-esp_err_t sdspi_host_deinit()
+esp_err_t sdspi_host_deinit(void)
 {
     for (size_t i = 0; i < sizeof(s_slots)/sizeof(s_slots[0]); ++i) {
         if (s_slots[i].handle) {

components/driver/spi_common.c

@@ -394,7 +394,7 @@ bool IRAM_ATTR spicommon_dmaworkaround_req_reset(int dmachan, dmaworkaround_cb_t
     return ret;
 }
 
-bool IRAM_ATTR spicommon_dmaworkaround_reset_in_progress()
+bool IRAM_ATTR spicommon_dmaworkaround_reset_in_progress(void)
 {
     return (dmaworkaround_waiting_for_chan != 0);
 }

components/driver/test/test_i2c.c

@@ -75,7 +75,7 @@ static void disp_buf(uint8_t *buf, int len)
     printf("\n");
 }
 
-static i2c_config_t i2c_master_init()
+static i2c_config_t i2c_master_init(void)
 {
     i2c_config_t conf_master = {
         .mode = I2C_MODE_MASTER,
@@ -88,7 +88,7 @@ static i2c_config_t i2c_master_init()
     return conf_master;
 }
 
-static i2c_config_t i2c_slave_init()
+static i2c_config_t i2c_slave_init(void)
 {
     i2c_config_t conf_slave = {
         .mode = I2C_MODE_SLAVE,
@@ -252,7 +252,7 @@ TEST_CASE("I2C driver memory leaking check", "[i2c]")
     TEST_ASSERT_INT_WITHIN(100, size, esp_get_free_heap_size());
 }
 
-static void i2c_master_write_test()
+static void i2c_master_write_test(void)
 {
     uint8_t *data_wr = (uint8_t *) malloc(DATA_LENGTH);
     int i;
@@ -276,7 +276,7 @@ static void i2c_master_write_test()
     TEST_ESP_OK(i2c_driver_delete(I2C_MASTER_NUM));
 }
 
-static void i2c_slave_read_test()
+static void i2c_slave_read_test(void)
 {
     uint8_t *data_rd = (uint8_t *) malloc(DATA_LENGTH);
     int size_rd = 0;
@@ -308,7 +308,7 @@ static void i2c_slave_read_test()
 
 TEST_CASE_MULTIPLE_DEVICES("I2C master write slave test", "[i2c][test_env=UT_T2_I2C][timeout=150]", i2c_master_write_test, i2c_slave_read_test);
 
-static void master_read_slave_test()
+static void master_read_slave_test(void)
 {
     uint8_t *data_rd = (uint8_t *) malloc(DATA_LENGTH);
     memset(data_rd, 0, DATA_LENGTH);
@@ -340,7 +340,7 @@ static void master_read_slave_test()
     i2c_driver_delete(I2C_MASTER_NUM);
 }
 
-static void slave_write_buffer_test()
+static void slave_write_buffer_test(void)
 {
     uint8_t *data_wr = (uint8_t *) malloc(DATA_LENGTH);
     int size_rd;
@@ -367,7 +367,7 @@ static void slave_write_buffer_test()
 
 TEST_CASE_MULTIPLE_DEVICES("I2C master read slave test", "[i2c][test_env=UT_T2_I2C][timeout=150]", master_read_slave_test, slave_write_buffer_test);
 
-static void i2c_master_write_read_test()
+static void i2c_master_write_read_test(void)
 {
     uint8_t *data_rd = (uint8_t *) malloc(DATA_LENGTH);
     memset(data_rd, 0, DATA_LENGTH);
@@ -409,7 +409,7 @@ static void i2c_master_write_read_test()
     i2c_driver_delete(I2C_MASTER_NUM);
 }
 
-static void i2c_slave_read_write_test()
+static void i2c_slave_read_write_test(void)
 {
     uint8_t *data_rd = (uint8_t *) malloc(DATA_LENGTH);
     memset(data_rd, 0, DATA_LENGTH);
@@ -445,7 +445,7 @@ static void i2c_slave_read_write_test()
 
 TEST_CASE_MULTIPLE_DEVICES("I2C read and write test", "[i2c][test_env=UT_T2_I2C][timeout=150]", i2c_master_write_read_test, i2c_slave_read_write_test);
 
-static void i2c_master_repeat_write()
+static void i2c_master_repeat_write(void)
 {
     uint8_t *data_wr = (uint8_t *) malloc(DATA_LENGTH);
     int times = 3;
@@ -471,7 +471,7 @@ static void i2c_master_repeat_write()
     i2c_driver_delete(I2C_MASTER_NUM);
 }
 
-static void i2c_slave_repeat_read()
+static void i2c_slave_repeat_read(void)
 {
     int size_rd = 0;
     int times = 3;

components/driver/test/test_rmt.c

@@ -262,7 +262,7 @@ static int get_rx_data(RingbufHandle_t rb)
 /**
  * @brief RMT transmitter initialization
  */
-static void tx_init()
+static void tx_init(void)
 {
     // the sender once it send something, its frq is 38kHz, and the duty cycle is 50%
     rmt_tx_config_t tx_cfg = {
@@ -289,7 +289,7 @@ static void tx_init()
 /**
  * @brief RMT receiver initialization
  */
-static void rx_init()
+static void rx_init(void)
 {
     rmt_rx_config_t rx_cfg = {
         .filter_en = true,

components/driver/test/test_spi_sio.c

@@ -154,7 +154,7 @@ void test_sio_master_round(bool test_mosi)
     master_free_device_bus(spi);
 }
 
-void test_sio_master()
+void test_sio_master(void)
 {
     test_sio_master_round(true);
     unity_send_signal("master ready");
@@ -210,7 +210,7 @@ void test_sio_slave_round(bool test_mosi)
     spi_slave_free(TEST_SLAVE_HOST);
 }
 
-void test_sio_slave()
+void test_sio_slave(void)
 {
     test_sio_slave_round(true);
     unity_wait_for_signal("master ready");

components/driver/test/test_spi_slave.c

@@ -51,7 +51,7 @@ static void master_init_nodma( spi_device_handle_t* spi)
     TEST_ASSERT(ret==ESP_OK);
 }
 
-static void slave_init()
+static void slave_init(void)
 {
     //Configuration for the SPI bus
     spi_bus_config_t buscfg={

components/driver/test/test_timer.c

@@ -127,7 +127,7 @@ static void all_timer_init(timer_config_t config, bool flag)
 }
 
 // start all of timer
-static void all_timer_start()
+static void all_timer_start(void)
 {
     esp_err_t ret;
     ret = timer_start(TIMER_GROUP_0, TIMER_0);
@@ -153,7 +153,7 @@ static void all_timer_set_counter_value(uint64_t set_timer_val)
     TEST_ASSERT(ret == ESP_OK);
 }
 
-static void all_timer_pause()
+static void all_timer_pause(void)
 {
     esp_err_t ret;
     ret = timer_pause(TIMER_GROUP_0, TIMER_0);