// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. #include "sdkconfig.h" #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "freertos/queue.h" #include "freertos/semphr.h" #include "esp_types.h" #include "esp_log.h" #include "esp_intr_alloc.h" #include "esp_pm.h" #include "esp_attr.h" #include "esp_heap_caps.h" #include "driver/gpio.h" #include "driver/periph_ctrl.h" #include "driver/twai.h" #include "soc/soc_caps.h" #include "soc/twai_periph.h" #include "hal/twai_hal.h" #include "esp_rom_gpio.h" /* ---------------------------- Definitions --------------------------------- */ //Internal Macros #define TWAI_CHECK(cond, ret_val) ({ \ if (!(cond)) { \ return (ret_val); \ } \ }) #define TWAI_CHECK_FROM_CRIT(cond, ret_val) ({ \ if (!(cond)) { \ TWAI_EXIT_CRITICAL(); \ return ret_val; \ } \ }) #define TWAI_SET_FLAG(var, mask) ((var) |= (mask)) #define TWAI_RESET_FLAG(var, mask) ((var) &= ~(mask)) #ifdef CONFIG_TWAI_ISR_IN_IRAM #define TWAI_ISR_ATTR IRAM_ATTR #define TWAI_MALLOC_CAPS (MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT) #else #define TWAI_TAG "TWAI" #define TWAI_ISR_ATTR #define TWAI_MALLOC_CAPS MALLOC_CAP_DEFAULT #endif //CONFIG_TWAI_ISR_IN_IRAM #define DRIVER_DEFAULT_INTERRUPTS 0xE7 //Exclude data overrun (bit[3]) and brp_div (bit[4]) #define ALERT_LOG_LEVEL_WARNING TWAI_ALERT_ARB_LOST //Alerts above and including this level use ESP_LOGW #define ALERT_LOG_LEVEL_ERROR TWAI_ALERT_TX_FAILED //Alerts above and including this level use ESP_LOGE /* ------------------ Typedefs, structures, and variables ------------------- */ //Control structure for TWAI driver typedef struct { //Control and status members twai_state_t state; twai_mode_t mode; uint32_t rx_missed_count; uint32_t rx_overrun_count; uint32_t tx_failed_count; uint32_t arb_lost_count; uint32_t bus_error_count; intr_handle_t isr_handle; //TX and RX #ifdef CONFIG_TWAI_ISR_IN_IRAM void *tx_queue_buff; void *tx_queue_struct; void *rx_queue_buff; void *rx_queue_struct; void *semphr_struct; #endif QueueHandle_t tx_queue; QueueHandle_t rx_queue; int tx_msg_count; int rx_msg_count; //Alerts SemaphoreHandle_t alert_semphr; uint32_t alerts_enabled; uint32_t alerts_triggered; #ifdef CONFIG_PM_ENABLE //Power Management esp_pm_lock_handle_t pm_lock; #endif } twai_obj_t; static twai_obj_t *p_twai_obj = NULL; static portMUX_TYPE twai_spinlock = portMUX_INITIALIZER_UNLOCKED; #define TWAI_ENTER_CRITICAL_ISR() portENTER_CRITICAL_ISR(&twai_spinlock) #define TWAI_EXIT_CRITICAL_ISR() portEXIT_CRITICAL_ISR(&twai_spinlock) #define TWAI_ENTER_CRITICAL() portENTER_CRITICAL(&twai_spinlock) #define TWAI_EXIT_CRITICAL() portEXIT_CRITICAL(&twai_spinlock) static twai_hal_context_t twai_context; /* -------------------- Interrupt and Alert Handlers ------------------------ */ TWAI_ISR_ATTR static void twai_alert_handler(uint32_t alert_code, int *alert_req) { if (p_twai_obj->alerts_enabled & alert_code) { //Signify alert has occurred TWAI_SET_FLAG(p_twai_obj->alerts_triggered, alert_code); *alert_req = 1; #ifndef CONFIG_TWAI_ISR_IN_IRAM //Only log if ISR is not in IRAM if (p_twai_obj->alerts_enabled & TWAI_ALERT_AND_LOG) { if (alert_code >= ALERT_LOG_LEVEL_ERROR) { ESP_EARLY_LOGE(TWAI_TAG, "Alert %d", alert_code); } else if (alert_code >= ALERT_LOG_LEVEL_WARNING) { ESP_EARLY_LOGW(TWAI_TAG, "Alert %d", alert_code); } else { ESP_EARLY_LOGI(TWAI_TAG, "Alert %d", alert_code); } } #endif //CONFIG_TWAI_ISR_IN_IRAM } } static inline void twai_handle_rx_buffer_frames(BaseType_t *task_woken, int *alert_req) { #ifdef SOC_TWAI_SUPPORTS_RX_STATUS uint32_t msg_count = twai_hal_get_rx_msg_count(&twai_context); for (uint32_t i = 0; i < msg_count; i++) { twai_hal_frame_t frame; if (twai_hal_read_rx_buffer_and_clear(&twai_context, &frame)) { //Valid frame copied from RX buffer if (xQueueSendFromISR(p_twai_obj->rx_queue, &frame, task_woken) == pdTRUE) { p_twai_obj->rx_msg_count++; } else { //Failed to send to queue p_twai_obj->rx_missed_count++; twai_alert_handler(TWAI_ALERT_RX_QUEUE_FULL, alert_req); } } else { //Failed to read from RX buffer because message is overrun p_twai_obj->rx_overrun_count++; twai_alert_handler(TWAI_ALERT_RX_FIFO_OVERRUN, alert_req); } } #else //SOC_TWAI_SUPPORTS_RX_STATUS uint32_t msg_count = twai_hal_get_rx_msg_count(&twai_context); bool overrun = false; //Clear all valid RX frames for (int i = 0; i < msg_count; i++) { twai_hal_frame_t frame; if (twai_hal_read_rx_buffer_and_clear(&twai_context, &frame)) { //Valid frame copied from RX buffer if (xQueueSendFromISR(p_twai_obj->rx_queue, &frame, task_woken) == pdTRUE) { p_twai_obj->rx_msg_count++; } else { p_twai_obj->rx_missed_count++; twai_alert_handler(TWAI_ALERT_RX_QUEUE_FULL, alert_req); } } else { overrun = true; break; } } //All remaining frames are treated as overrun. Clear them all if (overrun) { p_twai_obj->rx_overrun_count += twai_hal_clear_rx_fifo_overrun(&twai_context); twai_alert_handler(TWAI_ALERT_RX_FIFO_OVERRUN, alert_req); } #endif //SOC_TWAI_SUPPORTS_RX_STATUS } static inline void twai_handle_tx_buffer_frame(BaseType_t *task_woken, int *alert_req) { //Handle previously transmitted frame if (twai_hal_check_last_tx_successful(&twai_context)) { twai_alert_handler(TWAI_ALERT_TX_SUCCESS, alert_req); } else { p_twai_obj->tx_failed_count++; twai_alert_handler(TWAI_ALERT_TX_FAILED, alert_req); } //Update TX message count p_twai_obj->tx_msg_count--; assert(p_twai_obj->tx_msg_count >= 0); //Sanity check //Check if there are more frames to transmit if (p_twai_obj->tx_msg_count > 0 && p_twai_obj->tx_queue != NULL) { twai_hal_frame_t frame; int res = xQueueReceiveFromISR(p_twai_obj->tx_queue, &frame, task_woken); if (res == pdTRUE) { twai_hal_set_tx_buffer_and_transmit(&twai_context, &frame); } else { assert(false && "failed to get a frame from TX queue"); } } else { //No more frames to transmit twai_alert_handler(TWAI_ALERT_TX_IDLE, alert_req); } } TWAI_ISR_ATTR static void twai_intr_handler_main(void *arg) { BaseType_t task_woken = pdFALSE; int alert_req = 0; uint32_t events; TWAI_ENTER_CRITICAL_ISR(); if (p_twai_obj == NULL) { //In case intr occurs whilst driver is being uninstalled TWAI_EXIT_CRITICAL_ISR(); return; } events = twai_hal_get_events(&twai_context); //Get the events that triggered the interrupt #if defined(CONFIG_TWAI_ERRATA_FIX_RX_FRAME_INVALID) || defined(CONFIG_TWAI_ERRATA_FIX_RX_FIFO_CORRUPT) if (events & TWAI_HAL_EVENT_NEED_PERIPH_RESET) { twai_hal_prepare_for_reset(&twai_context); periph_module_reset(PERIPH_TWAI_MODULE); twai_hal_recover_from_reset(&twai_context); p_twai_obj->rx_missed_count += twai_hal_get_reset_lost_rx_cnt(&twai_context); twai_alert_handler(TWAI_ALERT_PERIPH_RESET, &alert_req); } #endif if (events & TWAI_HAL_EVENT_RX_BUFF_FRAME) { //Note: This event will never occur if there is a periph reset event twai_handle_rx_buffer_frames(&task_woken, &alert_req); } if (events & TWAI_HAL_EVENT_TX_BUFF_FREE) { twai_handle_tx_buffer_frame(&task_woken, &alert_req); } //Handle events that only require alerting (i.e. no handler) if (events & TWAI_HAL_EVENT_BUS_OFF) { p_twai_obj->state = TWAI_STATE_BUS_OFF; twai_alert_handler(TWAI_ALERT_BUS_OFF, &alert_req); } if (events & TWAI_HAL_EVENT_BUS_RECOV_CPLT) { p_twai_obj->state = TWAI_STATE_STOPPED; twai_alert_handler(TWAI_ALERT_BUS_RECOVERED, &alert_req); } if (events & TWAI_HAL_EVENT_BUS_ERR) { p_twai_obj->bus_error_count++; twai_alert_handler(TWAI_ALERT_BUS_ERROR, &alert_req); } if (events & TWAI_HAL_EVENT_ARB_LOST) { p_twai_obj->arb_lost_count++; twai_alert_handler(TWAI_ALERT_ARB_LOST, &alert_req); } if (events & TWAI_HAL_EVENT_BUS_RECOV_PROGRESS) { //Bus-recovery in progress. TEC has dropped below error warning limit twai_alert_handler(TWAI_ALERT_RECOVERY_IN_PROGRESS, &alert_req); } if (events & TWAI_HAL_EVENT_ERROR_PASSIVE) { //Entered error passive twai_alert_handler(TWAI_ALERT_ERR_PASS, &alert_req); } if (events & TWAI_HAL_EVENT_ERROR_ACTIVE) { //Returned to error active twai_alert_handler(TWAI_ALERT_ERR_ACTIVE, &alert_req); } if (events & TWAI_HAL_EVENT_ABOVE_EWL) { //TEC or REC surpassed error warning limit twai_alert_handler(TWAI_ALERT_ABOVE_ERR_WARN, &alert_req); } if (events & TWAI_HAL_EVENT_BELOW_EWL) { //TEC and REC are both below error warning twai_alert_handler(TWAI_ALERT_BELOW_ERR_WARN, &alert_req); } TWAI_EXIT_CRITICAL_ISR(); if (p_twai_obj->alert_semphr != NULL && alert_req) { //Give semaphore if alerts were triggered xSemaphoreGiveFromISR(p_twai_obj->alert_semphr, &task_woken); } if (task_woken == pdTRUE) { portYIELD_FROM_ISR(); } } /* -------------------------- Helper functions ----------------------------- */ static void twai_configure_gpio(gpio_num_t tx, gpio_num_t rx, gpio_num_t clkout, gpio_num_t bus_status) { //Set TX pin gpio_set_pull_mode(tx, GPIO_FLOATING); esp_rom_gpio_connect_out_signal(tx, TWAI_TX_IDX, false, false); esp_rom_gpio_pad_select_gpio(tx); //Set RX pin gpio_set_pull_mode(rx, GPIO_FLOATING); esp_rom_gpio_connect_in_signal(rx, TWAI_RX_IDX, false); esp_rom_gpio_pad_select_gpio(rx); gpio_set_direction(rx, GPIO_MODE_INPUT); //Configure output clock pin (Optional) if (clkout >= 0 && clkout < GPIO_NUM_MAX) { gpio_set_pull_mode(clkout, GPIO_FLOATING); esp_rom_gpio_connect_out_signal(clkout, TWAI_CLKOUT_IDX, false, false); esp_rom_gpio_pad_select_gpio(clkout); } //Configure bus status pin (Optional) if (bus_status >= 0 && bus_status < GPIO_NUM_MAX) { gpio_set_pull_mode(bus_status, GPIO_FLOATING); esp_rom_gpio_connect_out_signal(bus_status, TWAI_BUS_OFF_ON_IDX, false, false); esp_rom_gpio_pad_select_gpio(bus_status); } } static void twai_free_driver_obj(twai_obj_t *p_obj) { //Free driver object and any dependent SW resources it uses (queues, semaphores etc) #ifdef CONFIG_PM_ENABLE if (p_obj->pm_lock != NULL) { ESP_ERROR_CHECK(esp_pm_lock_delete(p_obj->pm_lock)); } #endif //Delete queues and semaphores if (p_obj->tx_queue != NULL) { vQueueDelete(p_obj->tx_queue); } if (p_obj->rx_queue != NULL) { vQueueDelete(p_obj->rx_queue); } if (p_obj->alert_semphr != NULL) { vSemaphoreDelete(p_obj->alert_semphr); } #ifdef CONFIG_TWAI_ISR_IN_IRAM //Free memory used by static queues and semaphores. free() allows freeing NULL pointers free(p_obj->tx_queue_buff); free(p_obj->tx_queue_struct); free(p_obj->rx_queue_buff); free(p_obj->rx_queue_struct); free(p_obj->semphr_struct); #endif //CONFIG_TWAI_ISR_IN_IRAM free(p_obj); } static twai_obj_t *twai_alloc_driver_obj(uint32_t tx_queue_len, uint32_t rx_queue_len) { //Allocates driver object and any dependent SW resources it uses (queues, semaphores etc) //Create a TWAI driver object twai_obj_t *p_obj = heap_caps_calloc(1, sizeof(twai_obj_t), TWAI_MALLOC_CAPS); if (p_obj == NULL) { return NULL; } #ifdef CONFIG_TWAI_ISR_IN_IRAM //Allocate memory for queues and semaphores in DRAM if (tx_queue_len > 0) { p_obj->tx_queue_buff = heap_caps_calloc(tx_queue_len, sizeof(twai_hal_frame_t), TWAI_MALLOC_CAPS); p_obj->tx_queue_struct = heap_caps_calloc(1, sizeof(StaticQueue_t), TWAI_MALLOC_CAPS); if (p_obj->tx_queue_buff == NULL || p_obj->tx_queue_struct == NULL) { goto cleanup; } } p_obj->rx_queue_buff = heap_caps_calloc(rx_queue_len, sizeof(twai_hal_frame_t), TWAI_MALLOC_CAPS); p_obj->rx_queue_struct = heap_caps_calloc(1, sizeof(StaticQueue_t), TWAI_MALLOC_CAPS); p_obj->semphr_struct = heap_caps_calloc(1, sizeof(StaticSemaphore_t), TWAI_MALLOC_CAPS); if (p_obj->rx_queue_buff == NULL || p_obj->rx_queue_struct == NULL || p_obj->semphr_struct == NULL) { goto cleanup; } //Create static queues and semaphores if (tx_queue_len > 0) { p_obj->tx_queue = xQueueCreateStatic(tx_queue_len, sizeof(twai_hal_frame_t), p_obj->tx_queue_buff, p_obj->tx_queue_struct); if (p_obj->tx_queue == NULL) { goto cleanup; } } p_obj->rx_queue = xQueueCreateStatic(rx_queue_len, sizeof(twai_hal_frame_t), p_obj->rx_queue_buff, p_obj->rx_queue_struct); p_obj->alert_semphr = xSemaphoreCreateBinaryStatic(p_obj->semphr_struct); if (p_obj->rx_queue == NULL || p_obj->alert_semphr == NULL) { goto cleanup; } #else //CONFIG_TWAI_ISR_IN_IRAM if (tx_queue_len > 0) { p_obj->tx_queue = xQueueCreate(tx_queue_len, sizeof(twai_hal_frame_t)); } p_obj->rx_queue = xQueueCreate(rx_queue_len, sizeof(twai_hal_frame_t)); p_obj->alert_semphr = xSemaphoreCreateBinary(); if ((tx_queue_len > 0 && p_obj->tx_queue == NULL) || p_obj->rx_queue == NULL || p_obj->alert_semphr == NULL) { goto cleanup; } #endif //CONFIG_TWAI_ISR_IN_IRAM #ifdef CONFIG_PM_ENABLE esp_err_t pm_err = esp_pm_lock_create(ESP_PM_APB_FREQ_MAX, 0, "twai", &(p_obj->pm_lock)); if (pm_err != ESP_OK ) { goto cleanup; } #endif return p_obj; cleanup: twai_free_driver_obj(p_obj); return NULL; } /* ---------------------------- Public Functions ---------------------------- */ esp_err_t twai_driver_install(const twai_general_config_t *g_config, const twai_timing_config_t *t_config, const twai_filter_config_t *f_config) { //Check arguments TWAI_CHECK(g_config != NULL, ESP_ERR_INVALID_ARG); TWAI_CHECK(t_config != NULL, ESP_ERR_INVALID_ARG); TWAI_CHECK(f_config != NULL, ESP_ERR_INVALID_ARG); TWAI_CHECK(g_config->rx_queue_len > 0, ESP_ERR_INVALID_ARG); TWAI_CHECK(g_config->tx_io >= 0 && g_config->tx_io < GPIO_NUM_MAX, ESP_ERR_INVALID_ARG); TWAI_CHECK(g_config->rx_io >= 0 && g_config->rx_io < GPIO_NUM_MAX, ESP_ERR_INVALID_ARG); #if (CONFIG_ESP32_REV_MIN >= 2) TWAI_CHECK(t_config->brp >= SOC_TWAI_BRP_MIN && t_config->brp <= SOC_TWAI_BRP_MAX_ECO, ESP_ERR_INVALID_ARG); #else TWAI_CHECK(t_config->brp >= SOC_TWAI_BRP_MIN && t_config->brp <= SOC_TWAI_BRP_MAX, ESP_ERR_INVALID_ARG); #endif #ifndef CONFIG_TWAI_ISR_IN_IRAM TWAI_CHECK(!(g_config->intr_flags & ESP_INTR_FLAG_IRAM), ESP_ERR_INVALID_ARG); #endif TWAI_ENTER_CRITICAL(); TWAI_CHECK_FROM_CRIT(p_twai_obj == NULL, ESP_ERR_INVALID_STATE); TWAI_EXIT_CRITICAL(); esp_err_t ret; twai_obj_t *p_twai_obj_dummy; //Create a TWAI object (including queues and semaphores) p_twai_obj_dummy = twai_alloc_driver_obj(g_config->tx_queue_len, g_config->rx_queue_len); TWAI_CHECK(p_twai_obj_dummy != NULL, ESP_ERR_NO_MEM); //Initialize flags and variables. All other members are already set to zero by twai_alloc_driver_obj() p_twai_obj_dummy->state = TWAI_STATE_STOPPED; p_twai_obj_dummy->mode = g_config->mode; p_twai_obj_dummy->alerts_enabled = g_config->alerts_enabled; //Initialize TWAI peripheral registers, and allocate interrupt TWAI_ENTER_CRITICAL(); if (p_twai_obj == NULL) { p_twai_obj = p_twai_obj_dummy; } else { //Check if driver is already installed TWAI_EXIT_CRITICAL(); ret = ESP_ERR_INVALID_STATE; goto err; } periph_module_reset(PERIPH_TWAI_MODULE); periph_module_enable(PERIPH_TWAI_MODULE); //Enable APB CLK to TWAI peripheral bool init = twai_hal_init(&twai_context); assert(init); (void)init; twai_hal_configure(&twai_context, t_config, f_config, DRIVER_DEFAULT_INTERRUPTS, g_config->clkout_divider); TWAI_EXIT_CRITICAL(); //Allocate GPIO and Interrupts twai_configure_gpio(g_config->tx_io, g_config->rx_io, g_config->clkout_io, g_config->bus_off_io); ESP_ERROR_CHECK(esp_intr_alloc(ETS_TWAI_INTR_SOURCE, g_config->intr_flags, twai_intr_handler_main, NULL, &p_twai_obj->isr_handle)); #ifdef CONFIG_PM_ENABLE ESP_ERROR_CHECK(esp_pm_lock_acquire(p_twai_obj->pm_lock)); //Acquire pm_lock to keep APB clock at 80MHz #endif return ESP_OK; //TWAI module is still in reset mode, users need to call twai_start() afterwards err: twai_free_driver_obj(p_twai_obj_dummy); return ret; } esp_err_t twai_driver_uninstall(void) { twai_obj_t *p_twai_obj_dummy; TWAI_ENTER_CRITICAL(); //Check state TWAI_CHECK_FROM_CRIT(p_twai_obj != NULL, ESP_ERR_INVALID_STATE); TWAI_CHECK_FROM_CRIT(p_twai_obj->state == TWAI_STATE_STOPPED || p_twai_obj->state == TWAI_STATE_BUS_OFF, ESP_ERR_INVALID_STATE); //Clear registers by reading twai_hal_deinit(&twai_context); periph_module_disable(PERIPH_TWAI_MODULE); //Disable TWAI peripheral p_twai_obj_dummy = p_twai_obj; //Use dummy to shorten critical section p_twai_obj = NULL; TWAI_EXIT_CRITICAL(); ESP_ERROR_CHECK(esp_intr_free(p_twai_obj_dummy->isr_handle)); //Free interrupt #ifdef CONFIG_PM_ENABLE //Release and delete power management lock ESP_ERROR_CHECK(esp_pm_lock_release(p_twai_obj_dummy->pm_lock)); #endif //Free can driver object twai_free_driver_obj(p_twai_obj_dummy); return ESP_OK; } esp_err_t twai_start(void) { //Check state TWAI_ENTER_CRITICAL(); TWAI_CHECK_FROM_CRIT(p_twai_obj != NULL, ESP_ERR_INVALID_STATE); TWAI_CHECK_FROM_CRIT(p_twai_obj->state == TWAI_STATE_STOPPED, ESP_ERR_INVALID_STATE); //Reset RX queue, RX message count, amd TX queue xQueueReset(p_twai_obj->rx_queue); if (p_twai_obj->tx_queue != NULL) { xQueueReset(p_twai_obj->tx_queue); } p_twai_obj->rx_msg_count = 0; p_twai_obj->tx_msg_count = 0; twai_hal_start(&twai_context, p_twai_obj->mode); p_twai_obj->state = TWAI_STATE_RUNNING; TWAI_EXIT_CRITICAL(); return ESP_OK; } esp_err_t twai_stop(void) { //Check state TWAI_ENTER_CRITICAL(); TWAI_CHECK_FROM_CRIT(p_twai_obj != NULL, ESP_ERR_INVALID_STATE); TWAI_CHECK_FROM_CRIT(p_twai_obj->state == TWAI_STATE_RUNNING, ESP_ERR_INVALID_STATE); twai_hal_stop(&twai_context); //Reset TX Queue and message count if (p_twai_obj->tx_queue != NULL) { xQueueReset(p_twai_obj->tx_queue); } p_twai_obj->tx_msg_count = 0; p_twai_obj->state = TWAI_STATE_STOPPED; TWAI_EXIT_CRITICAL(); return ESP_OK; } esp_err_t twai_transmit(const twai_message_t *message, TickType_t ticks_to_wait) { //Check arguments TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE); TWAI_CHECK(message != NULL, ESP_ERR_INVALID_ARG); TWAI_CHECK((message->data_length_code <= TWAI_FRAME_MAX_DLC) || message->dlc_non_comp, ESP_ERR_INVALID_ARG); TWAI_ENTER_CRITICAL(); //Check State TWAI_CHECK_FROM_CRIT(!(p_twai_obj->mode == TWAI_MODE_LISTEN_ONLY), ESP_ERR_NOT_SUPPORTED); TWAI_CHECK_FROM_CRIT(p_twai_obj->state == TWAI_STATE_RUNNING, ESP_ERR_INVALID_STATE); //Format frame esp_err_t ret = ESP_FAIL; twai_hal_frame_t tx_frame; twai_hal_format_frame(message, &tx_frame); //Check if frame can be sent immediately if (p_twai_obj->tx_msg_count == 0) { //No other frames waiting to transmit. Bypass queue and transmit immediately twai_hal_set_tx_buffer_and_transmit(&twai_context, &tx_frame); p_twai_obj->tx_msg_count++; ret = ESP_OK; } TWAI_EXIT_CRITICAL(); if (ret != ESP_OK) { if (p_twai_obj->tx_queue == NULL) { //TX Queue is disabled and TX buffer is occupied, message was not sent ret = ESP_FAIL; } else if (xQueueSend(p_twai_obj->tx_queue, &tx_frame, ticks_to_wait) == pdTRUE) { //Copied to TX Queue TWAI_ENTER_CRITICAL(); if ((!twai_hal_check_state_flags(&twai_context, TWAI_HAL_STATE_FLAG_TX_BUFF_OCCUPIED)) && uxQueueMessagesWaiting(p_twai_obj->tx_queue) > 0) { //If the TX buffer is free but the TX queue is not empty. Check if we need to manually start a transmission if (twai_hal_check_state_flags(&twai_context, TWAI_HAL_STATE_FLAG_BUS_OFF) || !twai_hal_check_state_flags(&twai_context, TWAI_HAL_STATE_FLAG_RUNNING)) { //TX buffer became free due to bus-off or is no longer running. No need to start a transmission ret = ESP_ERR_INVALID_STATE; } else { //Manually start a transmission int res = xQueueReceive(p_twai_obj->tx_queue, &tx_frame, 0); assert(res == pdTRUE); (void)res; twai_hal_set_tx_buffer_and_transmit(&twai_context, &tx_frame); p_twai_obj->tx_msg_count++; ret = ESP_OK; } } else { //Frame was copied to queue, waiting to be transmitted p_twai_obj->tx_msg_count++; ret = ESP_OK; } TWAI_EXIT_CRITICAL(); } else { //Timed out waiting for free space on TX queue ret = ESP_ERR_TIMEOUT; } } return ret; } esp_err_t twai_receive(twai_message_t *message, TickType_t ticks_to_wait) { //Check arguments and state TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE); TWAI_CHECK(message != NULL, ESP_ERR_INVALID_ARG); //Get frame from RX Queue or RX Buffer twai_hal_frame_t rx_frame; if (xQueueReceive(p_twai_obj->rx_queue, &rx_frame, ticks_to_wait) != pdTRUE) { return ESP_ERR_TIMEOUT; } TWAI_ENTER_CRITICAL(); p_twai_obj->rx_msg_count--; TWAI_EXIT_CRITICAL(); //Decode frame twai_hal_parse_frame(&rx_frame, message); return ESP_OK; } esp_err_t twai_read_alerts(uint32_t *alerts, TickType_t ticks_to_wait) { //Check arguments and state TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE); TWAI_CHECK(alerts != NULL, ESP_ERR_INVALID_ARG); //Wait for an alert to occur if (xSemaphoreTake(p_twai_obj->alert_semphr, ticks_to_wait) == pdTRUE) { TWAI_ENTER_CRITICAL(); *alerts = p_twai_obj->alerts_triggered; p_twai_obj->alerts_triggered = 0; //Clear triggered alerts TWAI_EXIT_CRITICAL(); return ESP_OK; } else { *alerts = 0; return ESP_ERR_TIMEOUT; } } esp_err_t twai_reconfigure_alerts(uint32_t alerts_enabled, uint32_t *current_alerts) { TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE); TWAI_ENTER_CRITICAL(); //Clear any unhandled alerts if (current_alerts != NULL) { *current_alerts = p_twai_obj->alerts_triggered;; } p_twai_obj->alerts_triggered = 0; p_twai_obj->alerts_enabled = alerts_enabled; //Update enabled alerts TWAI_EXIT_CRITICAL(); return ESP_OK; } esp_err_t twai_initiate_recovery(void) { TWAI_ENTER_CRITICAL(); //Check state TWAI_CHECK_FROM_CRIT(p_twai_obj != NULL, ESP_ERR_INVALID_STATE); TWAI_CHECK_FROM_CRIT(p_twai_obj->state == TWAI_STATE_BUS_OFF, ESP_ERR_INVALID_STATE); //Reset TX Queue/Counters if (p_twai_obj->tx_queue != NULL) { xQueueReset(p_twai_obj->tx_queue); } p_twai_obj->tx_msg_count = 0; //Trigger start of recovery process twai_hal_start_bus_recovery(&twai_context); p_twai_obj->state = TWAI_STATE_RECOVERING; TWAI_EXIT_CRITICAL(); return ESP_OK; } esp_err_t twai_get_status_info(twai_status_info_t *status_info) { //Check parameters and state TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE); TWAI_CHECK(status_info != NULL, ESP_ERR_INVALID_ARG); TWAI_ENTER_CRITICAL(); status_info->tx_error_counter = twai_hal_get_tec(&twai_context); status_info->rx_error_counter = twai_hal_get_rec(&twai_context); status_info->msgs_to_tx = p_twai_obj->tx_msg_count; status_info->msgs_to_rx = p_twai_obj->rx_msg_count; status_info->tx_failed_count = p_twai_obj->tx_failed_count; status_info->rx_missed_count = p_twai_obj->rx_missed_count; status_info->rx_overrun_count = p_twai_obj->rx_overrun_count; status_info->arb_lost_count = p_twai_obj->arb_lost_count; status_info->bus_error_count = p_twai_obj->bus_error_count; status_info->state = p_twai_obj->state; TWAI_EXIT_CRITICAL(); return ESP_OK; } esp_err_t twai_clear_transmit_queue(void) { //Check State TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE); TWAI_CHECK(p_twai_obj->tx_queue != NULL, ESP_ERR_NOT_SUPPORTED); TWAI_ENTER_CRITICAL(); //If a message is currently undergoing transmission, the tx interrupt handler will decrement tx_msg_count p_twai_obj->tx_msg_count = twai_hal_check_state_flags(&twai_context, TWAI_HAL_STATE_FLAG_TX_BUFF_OCCUPIED) ? 1 : 0; xQueueReset(p_twai_obj->tx_queue); TWAI_EXIT_CRITICAL(); return ESP_OK; } esp_err_t twai_clear_receive_queue(void) { //Check State TWAI_CHECK(p_twai_obj != NULL, ESP_ERR_INVALID_STATE); TWAI_ENTER_CRITICAL(); p_twai_obj->rx_msg_count = 0; xQueueReset(p_twai_obj->rx_queue); TWAI_EXIT_CRITICAL(); return ESP_OK; }