/* * SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 */ #include #include #include "freertos/FreeRTOS.h" #include "freertos/queue.h" #include "freertos/task.h" #include "sdkconfig.h" #if CONFIG_I2S_ENABLE_DEBUG_LOG // The local log level must be defined before including esp_log.h // Set the maximum log level for this source file #define LOG_LOCAL_LEVEL ESP_LOG_DEBUG #endif #include "esp_log.h" #include "soc/i2s_periph.h" #include "soc/soc_caps.h" #include "hal/gpio_hal.h" #include "hal/i2s_hal.h" #if SOC_I2S_SUPPORTS_ADC_DAC #include "hal/adc_ll.h" #include "driver/adc_i2s_legacy.h" #endif #if SOC_I2S_SUPPORTS_APLL #include "clk_ctrl_os.h" #endif #include "esp_private/i2s_platform.h" #include "esp_private/periph_ctrl.h" #include "driver/gpio.h" #include "driver/i2s_common.h" #include "i2s_private.h" #include "clk_ctrl_os.h" #include "esp_intr_alloc.h" #include "esp_check.h" #include "esp_attr.h" #include "esp_rom_gpio.h" #define I2S_DMA_BUFFER_MAX_SIZE (4092) // If ISR handler is allowed to run whilst cache is disabled, // Make sure all the code and related variables used by the handler are in the SRAM #if CONFIG_I2S_ISR_IRAM_SAFE #define I2S_INTR_ALLOC_FLAGS (ESP_INTR_FLAG_IRAM | ESP_INTR_FLAG_INTRDISABLED | ESP_INTR_FLAG_SHARED) #define I2S_MEM_ALLOC_CAPS (MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT) #else #define I2S_INTR_ALLOC_FLAGS (ESP_INTR_FLAG_INTRDISABLED | ESP_INTR_FLAG_SHARED) #define I2S_MEM_ALLOC_CAPS MALLOC_CAP_DEFAULT #endif //CONFIG_I2S_ISR_IRAM_SAFE #define I2S_DMA_ALLOC_CAPS (MALLOC_CAP_INTERNAL | MALLOC_CAP_DMA) /** * @brief Global i2s platform object * @note For saving all the I2S related information */ i2s_platform_t g_i2s = { .spinlock = (portMUX_TYPE)portMUX_INITIALIZER_UNLOCKED, .controller[0 ... (SOC_I2S_NUM - 1)] = NULL, // groups will be lazy installed .comp_name[0 ... (SOC_I2S_NUM - 1)] = NULL, }; static const char *TAG = "i2s_common"; /*--------------------------------------------------------------------------- I2S Static APIs ---------------------------------------------------------------------------- Scope: This file only ----------------------------------------------------------------------------*/ static void i2s_tx_channel_start(i2s_chan_handle_t handle) { i2s_hal_tx_reset(&(handle->controller->hal)); #if SOC_GDMA_SUPPORTED gdma_reset((handle->dma.dma_chan)); #else i2s_hal_tx_reset_dma(&(handle->controller->hal)); #endif i2s_hal_tx_reset_fifo(&(handle->controller->hal)); #if SOC_GDMA_SUPPORTED gdma_start((handle->dma.dma_chan), (uint32_t) handle->dma.desc[0]); #else esp_intr_enable(handle->dma.dma_chan); i2s_hal_tx_enable_intr(&(handle->controller->hal)); i2s_hal_tx_enable_dma(&(handle->controller->hal)); i2s_hal_tx_start_link(&(handle->controller->hal), (uint32_t) handle->dma.desc[0]); #endif i2s_hal_tx_start(&(handle->controller->hal)); } static void i2s_rx_channel_start(i2s_chan_handle_t handle) { i2s_hal_rx_reset(&(handle->controller->hal)); #if SOC_GDMA_SUPPORTED gdma_reset(handle->dma.dma_chan); #else i2s_hal_rx_reset_dma(&(handle->controller->hal)); #endif i2s_hal_rx_reset_fifo(&(handle->controller->hal)); #if SOC_GDMA_SUPPORTED gdma_start(handle->dma.dma_chan, (uint32_t) handle->dma.desc[0]); #else esp_intr_enable(handle->dma.dma_chan); i2s_hal_rx_enable_intr(&(handle->controller->hal)); i2s_hal_rx_enable_dma(&(handle->controller->hal)); i2s_hal_rx_start_link(&(handle->controller->hal), (uint32_t) handle->dma.desc[0]); #endif i2s_hal_rx_start(&(handle->controller->hal)); } static void i2s_tx_channel_stop(i2s_chan_handle_t handle) { i2s_hal_tx_stop(&(handle->controller->hal)); #if SOC_GDMA_SUPPORTED gdma_stop(handle->dma.dma_chan); #else i2s_hal_tx_stop_link(&(handle->controller->hal)); i2s_hal_tx_disable_intr(&(handle->controller->hal)); i2s_hal_tx_disable_dma(&(handle->controller->hal)); esp_intr_disable(handle->dma.dma_chan); #endif } static void i2s_rx_channel_stop(i2s_chan_handle_t handle) { i2s_hal_rx_stop(&(handle->controller->hal)); #if SOC_GDMA_SUPPORTED gdma_stop(handle->dma.dma_chan); #else i2s_hal_rx_stop_link(&(handle->controller->hal)); i2s_hal_rx_disable_intr(&(handle->controller->hal)); i2s_hal_rx_disable_dma(&(handle->controller->hal)); esp_intr_disable(handle->dma.dma_chan); #endif } static esp_err_t i2s_destroy_controller_obj(i2s_controller_t **i2s_obj) { I2S_NULL_POINTER_CHECK(TAG, i2s_obj); I2S_NULL_POINTER_CHECK(TAG, *i2s_obj); ESP_RETURN_ON_FALSE(!(*i2s_obj)->rx_chan && !(*i2s_obj)->tx_chan, ESP_ERR_INVALID_STATE, TAG, "there still have channels under this i2s controller"); int id = (*i2s_obj)->id; #if SOC_I2S_HW_VERSION_1 i2s_ll_enable_dma((*i2s_obj)->hal.dev, false); #endif free(*i2s_obj); *i2s_obj = NULL; return i2s_platform_release_occupation(id); } /** * @brief Acquire i2s controller object * * @param id i2s port id * @param search_reverse reverse the sequence of port acquirement * set false to acquire from I2S_NUM_0 first * set true to acquire from SOC_I2S_NUM - 1 first * @return * - pointer of acquired i2s controller object */ static i2s_controller_t *i2s_acquire_controller_obj(int id) { if (id < 0 || id >= SOC_I2S_NUM) { return NULL; } /* pre-alloc controller object */ i2s_controller_t *pre_alloc = (i2s_controller_t *)heap_caps_calloc(1, sizeof(i2s_controller_t), I2S_MEM_ALLOC_CAPS); if (pre_alloc == NULL) { return NULL; } pre_alloc->id = id; i2s_hal_init(&pre_alloc->hal, id); pre_alloc->full_duplex = false; pre_alloc->tx_chan = NULL; pre_alloc->rx_chan = NULL; pre_alloc->mclk = I2S_GPIO_UNUSED; i2s_controller_t *i2s_obj = NULL; /* Try to occupy this i2s controller */ if (i2s_platform_acquire_occupation(id, "i2s_driver") == ESP_OK) { portENTER_CRITICAL(&g_i2s.spinlock); i2s_obj = pre_alloc; g_i2s.controller[id] = i2s_obj; portEXIT_CRITICAL(&g_i2s.spinlock); #if SOC_I2S_SUPPORTS_ADC_DAC if (id == I2S_NUM_0) { adc_ll_digi_set_data_source(ADC_I2S_DATA_SRC_IO_SIG); } #endif } else { free(pre_alloc); portENTER_CRITICAL(&g_i2s.spinlock); if (g_i2s.controller[id]) { i2s_obj = g_i2s.controller[id]; } else { } portEXIT_CRITICAL(&g_i2s.spinlock); if (i2s_obj == NULL) { ESP_LOGE(TAG, "i2s%d might be occupied by other component", id); } } return i2s_obj; } static inline bool i2s_take_available_channel(i2s_controller_t *i2s_obj, uint8_t chan_search_mask) { bool is_available = false; #if SOC_I2S_HW_VERSION_1 /* In ESP32 and ESP32-S2, tx channel and rx channel are not totally separated * Take both two channels in case one channel can affect another */ chan_search_mask = I2S_DIR_RX | I2S_DIR_TX; #endif portENTER_CRITICAL(&g_i2s.spinlock); if (!(chan_search_mask & i2s_obj->chan_occupancy)) { i2s_obj->chan_occupancy |= chan_search_mask; is_available = true; } portEXIT_CRITICAL(&g_i2s.spinlock); return is_available; } static esp_err_t i2s_register_channel(i2s_controller_t *i2s_obj, i2s_dir_t dir, uint32_t desc_num) { I2S_NULL_POINTER_CHECK(TAG, i2s_obj); esp_err_t ret = ESP_OK; i2s_chan_handle_t new_chan = (i2s_chan_handle_t)heap_caps_calloc(1, sizeof(struct i2s_channel_t), I2S_MEM_ALLOC_CAPS); ESP_RETURN_ON_FALSE(new_chan, ESP_ERR_NO_MEM, TAG, "No memory for new channel"); new_chan->mode = I2S_COMM_MODE_NONE; new_chan->role = I2S_ROLE_MASTER; // Set default role to master new_chan->dir = dir; new_chan->state = I2S_CHAN_STATE_REGISTER; #if SOC_I2S_SUPPORTS_APLL new_chan->apll_en = false; #endif new_chan->mode_info = NULL; new_chan->controller = i2s_obj; #if CONFIG_PM_ENABLE new_chan->pm_lock = NULL; // Init in i2s_set_clock according to clock source #endif #if CONFIG_I2S_ISR_IRAM_SAFE new_chan->msg_que_storage = (uint8_t *)heap_caps_calloc(desc_num - 1, sizeof(uint8_t *), I2S_MEM_ALLOC_CAPS); ESP_GOTO_ON_FALSE(new_chan->msg_que_storage, ESP_ERR_NO_MEM, err, TAG, "No memory for message queue storage"); new_chan->msg_que_struct = (StaticQueue_t *)heap_caps_calloc(1, sizeof(StaticQueue_t), I2S_MEM_ALLOC_CAPS); ESP_GOTO_ON_FALSE(new_chan->msg_que_struct, ESP_ERR_NO_MEM, err, TAG, "No memory for message queue struct"); new_chan->msg_queue = xQueueCreateStatic(desc_num - 1, sizeof(uint8_t *), new_chan->msg_que_storage, new_chan->msg_que_struct); ESP_GOTO_ON_FALSE(new_chan->msg_queue, ESP_ERR_NO_MEM, err, TAG, "No memory for message queue"); new_chan->mutex_struct = (StaticSemaphore_t *)heap_caps_calloc(1, sizeof(StaticSemaphore_t), I2S_MEM_ALLOC_CAPS); ESP_GOTO_ON_FALSE(new_chan->mutex_struct, ESP_ERR_NO_MEM, err, TAG, "No memory for mutex struct"); new_chan->mutex = xSemaphoreCreateMutexStatic(new_chan->mutex_struct); ESP_GOTO_ON_FALSE(new_chan->mutex, ESP_ERR_NO_MEM, err, TAG, "No memory for mutex"); new_chan->binary_struct = (StaticSemaphore_t *)heap_caps_calloc(1, sizeof(StaticSemaphore_t), I2S_MEM_ALLOC_CAPS); ESP_GOTO_ON_FALSE(new_chan->binary_struct, ESP_ERR_NO_MEM, err, TAG, "No memory for binary struct"); new_chan->binary = xSemaphoreCreateBinaryStatic(new_chan->binary_struct); ESP_GOTO_ON_FALSE(new_chan->binary, ESP_ERR_NO_MEM, err, TAG, "No memory for binary"); #else new_chan->msg_queue = xQueueCreate(desc_num - 1, sizeof(uint8_t *)); ESP_GOTO_ON_FALSE(new_chan->msg_queue, ESP_ERR_NO_MEM, err, TAG, "No memory for message queue"); new_chan->mutex = xSemaphoreCreateMutex(); ESP_GOTO_ON_FALSE(new_chan->mutex, ESP_ERR_NO_MEM, err, TAG, "No memory for mutex semaphore"); new_chan->binary = xSemaphoreCreateBinary(); ESP_GOTO_ON_FALSE(new_chan->binary, ESP_ERR_NO_MEM, err, TAG, "No memory for binary semaphore"); #endif new_chan->callbacks.on_recv = NULL; new_chan->callbacks.on_recv_q_ovf = NULL; new_chan->callbacks.on_sent = NULL; new_chan->callbacks.on_send_q_ovf = NULL; new_chan->start = NULL; new_chan->stop = NULL; if (dir == I2S_DIR_TX) { if (i2s_obj->tx_chan) { i2s_del_channel(i2s_obj->tx_chan); } i2s_obj->tx_chan = new_chan; } else { if (i2s_obj->rx_chan) { i2s_del_channel(i2s_obj->rx_chan); } i2s_obj->rx_chan = new_chan; } return ret; err: #if CONFIG_I2S_ISR_IRAM_SAFE if (new_chan->msg_que_storage) { free(new_chan->msg_que_storage); } if (new_chan->msg_que_struct) { free(new_chan->msg_que_struct); } if (new_chan->mutex_struct) { free(new_chan->mutex_struct); } if (new_chan->binary_struct) { free(new_chan->binary_struct); } #endif if (new_chan->msg_queue) { vQueueDelete(new_chan->msg_queue); } if (new_chan->mutex) { vSemaphoreDelete(new_chan->mutex); } if (new_chan->binary) { vSemaphoreDelete(new_chan->binary); } free(new_chan); return ret; } esp_err_t i2s_channel_register_event_callback(i2s_chan_handle_t handle, const i2s_event_callbacks_t *callbacks, void *user_data) { I2S_NULL_POINTER_CHECK(TAG, handle); I2S_NULL_POINTER_CHECK(TAG, callbacks); esp_err_t ret = ESP_OK; #if CONFIG_I2S_ISR_IRAM_SAFE if (callbacks->on_recv) { ESP_RETURN_ON_FALSE(esp_ptr_in_iram(callbacks->on_recv), ESP_ERR_INVALID_ARG, TAG, "on_recv callback not in IRAM"); } if (callbacks->on_recv_q_ovf) { ESP_RETURN_ON_FALSE(esp_ptr_in_iram(callbacks->on_recv_q_ovf), ESP_ERR_INVALID_ARG, TAG, "on_recv_q_ovf callback not in IRAM"); } if (callbacks->on_sent) { ESP_RETURN_ON_FALSE(esp_ptr_in_iram(callbacks->on_sent), ESP_ERR_INVALID_ARG, TAG, "on_sent callback not in IRAM"); } if (callbacks->on_send_q_ovf) { ESP_RETURN_ON_FALSE(esp_ptr_in_iram(callbacks->on_send_q_ovf), ESP_ERR_INVALID_ARG, TAG, "on_send_q_ovf callback not in IRAM"); } if (user_data) { ESP_RETURN_ON_FALSE(esp_ptr_internal(user_data), ESP_ERR_INVALID_ARG, TAG, "user context not in internal RAM"); } #endif xSemaphoreTake(handle->mutex, portMAX_DELAY); ESP_GOTO_ON_FALSE(handle->state < I2S_CHAN_STATE_RUNNING, ESP_ERR_INVALID_STATE, err, TAG, "invalid state, I2S has enabled"); memcpy(&(handle->callbacks), callbacks, sizeof(i2s_event_callbacks_t)); handle->user_data = user_data; err: xSemaphoreGive(handle->mutex); return ret; } uint32_t i2s_get_buf_size(i2s_chan_handle_t handle, uint32_t data_bit_width, uint32_t dma_frame_num) { uint32_t active_chan = handle->active_slot; uint32_t bytes_per_sample = ((data_bit_width + 15) / 16) * 2; uint32_t bytes_per_frame = bytes_per_sample * active_chan; uint32_t bufsize = dma_frame_num * bytes_per_frame; /* Limit DMA buffer size if it is out of range (DMA buffer limitation is 4092 bytes) */ if (bufsize > I2S_DMA_BUFFER_MAX_SIZE) { uint32_t frame_num = I2S_DMA_BUFFER_MAX_SIZE / bytes_per_frame; bufsize = frame_num * bytes_per_frame; ESP_LOGW(TAG, "dma frame num is out of dma buffer size, limited to %d", frame_num); } return bufsize; } esp_err_t i2s_free_dma_desc(i2s_chan_handle_t handle) { I2S_NULL_POINTER_CHECK(TAG, handle); if (!handle->dma.desc) { return ESP_OK; } for (int i = 0; i < handle->dma.desc_num; i++) { if (handle->dma.bufs[i]) { free(handle->dma.bufs[i]); } if (handle->dma.desc[i]) { free(handle->dma.desc[i]); } } if (handle->dma.bufs) { free(handle->dma.bufs); } if (handle->dma.desc) { free(handle->dma.desc); } handle->dma.desc = NULL; return ESP_OK; } esp_err_t i2s_alloc_dma_desc(i2s_chan_handle_t handle, uint32_t num, uint32_t bufsize) { I2S_NULL_POINTER_CHECK(TAG, handle); esp_err_t ret = ESP_OK; ESP_RETURN_ON_FALSE(bufsize <= I2S_DMA_BUFFER_MAX_SIZE, ESP_ERR_INVALID_ARG, TAG, "dma buffer can't be bigger than %d", I2S_DMA_BUFFER_MAX_SIZE); handle->dma.desc_num = num; handle->dma.buf_size = bufsize; handle->dma.desc = (lldesc_t **)heap_caps_calloc(num, sizeof(lldesc_t *), I2S_MEM_ALLOC_CAPS); ESP_GOTO_ON_FALSE(handle->dma.desc, ESP_ERR_NO_MEM, err, TAG, "create I2S DMA decriptor array failed"); handle->dma.bufs = (uint8_t **)heap_caps_calloc(num, sizeof(uint8_t *), I2S_MEM_ALLOC_CAPS); for (int i = 0; i < num; i++) { /* Allocate DMA descriptor */ handle->dma.desc[i] = (lldesc_t *) heap_caps_calloc(1, sizeof(lldesc_t), I2S_DMA_ALLOC_CAPS); ESP_GOTO_ON_FALSE(handle->dma.desc[i], ESP_ERR_NO_MEM, err, TAG, "allocate DMA description failed"); handle->dma.desc[i]->owner = 1; handle->dma.desc[i]->eof = 1; handle->dma.desc[i]->sosf = 0; handle->dma.desc[i]->length = bufsize; handle->dma.desc[i]->size = bufsize; handle->dma.desc[i]->offset = 0; handle->dma.bufs[i] = (uint8_t *) heap_caps_calloc(1, bufsize * sizeof(uint8_t), I2S_DMA_ALLOC_CAPS); handle->dma.desc[i]->buf = handle->dma.bufs[i]; ESP_GOTO_ON_FALSE(handle->dma.desc[i]->buf, ESP_ERR_NO_MEM, err, TAG, "allocate DMA buffer failed"); } /* Connect DMA descriptor as a circle */ for (int i = 0; i < num; i++) { /* Link to the next descriptor */ handle->dma.desc[i]->empty = (uint32_t)((i < (num - 1)) ? (handle->dma.desc[i + 1]) : handle->dma.desc[0]); } if (handle->dir == I2S_DIR_RX) { i2s_ll_rx_set_eof_num(handle->controller->hal.dev, bufsize); } ESP_LOGD(TAG, "DMA malloc info: dma_desc_num = %d, dma_desc_buf_size = dma_frame_num * slot_num * data_bit_width = %d, ", num, bufsize); return ESP_OK; err: i2s_free_dma_desc(handle); return ret; } #if SOC_I2S_SUPPORTS_APLL uint32_t i2s_set_get_apll_freq(uint32_t mclk_freq_hz) { /* Calculate the expected APLL */ int mclk_div = (int)((SOC_APLL_MIN_HZ / mclk_freq_hz) + 1); /* apll_freq = mclk * div * when div = 1, hardware will still divide 2 * when div = 0, the final mclk will be unpredictable * So the div here should be at least 2 */ mclk_div = mclk_div < 2 ? 2 : mclk_div; uint32_t expt_freq = mclk_freq_hz * mclk_div; uint32_t real_freq = 0; esp_err_t ret = periph_rtc_apll_freq_set(expt_freq, &real_freq); if (ret == ESP_ERR_INVALID_ARG) { ESP_LOGE(TAG, "set APLL freq failed due to invalid argument"); return 0; } if (ret == ESP_ERR_INVALID_STATE) { ESP_LOGW(TAG, "APLL is occupied already, it is working at %d Hz while the expected frequency is %d Hz", real_freq, expt_freq); ESP_LOGW(TAG, "Trying to work at %d Hz...", real_freq); } ESP_LOGD(TAG, "APLL expected frequency is %d Hz, real frequency is %d Hz", expt_freq, real_freq); return real_freq; } #endif #if SOC_GDMA_SUPPORTED static bool IRAM_ATTR i2s_dma_rx_callback(gdma_channel_handle_t dma_chan, gdma_event_data_t *event_data, void *user_data) { i2s_chan_handle_t handle = (i2s_chan_handle_t)user_data; portBASE_TYPE need_yield1 = 0; portBASE_TYPE need_yield2 = 0; portBASE_TYPE user_need_yield = 0; lldesc_t *finish_desc; uint32_t dummy; finish_desc = (lldesc_t *)event_data->rx_eof_desc_addr; i2s_event_data_t evt = { .data = &(finish_desc->buf), .size = handle->dma.buf_size, }; if (handle->callbacks.on_recv) { user_need_yield |= handle->callbacks.on_recv(handle, &evt, handle->user_data); } if (xQueueIsQueueFullFromISR(handle->msg_queue)) { xQueueReceiveFromISR(handle->msg_queue, &dummy, &need_yield1); if (handle->callbacks.on_recv_q_ovf) { evt.data = NULL; user_need_yield |= handle->callbacks.on_recv_q_ovf(handle, &evt, handle->user_data); } } xQueueSendFromISR(handle->msg_queue, &(finish_desc->buf), &need_yield2); return need_yield1 | need_yield2 | user_need_yield; } static bool IRAM_ATTR i2s_dma_tx_callback(gdma_channel_handle_t dma_chan, gdma_event_data_t *event_data, void *user_data) { i2s_chan_handle_t handle = (i2s_chan_handle_t)user_data; portBASE_TYPE need_yield1 = 0; portBASE_TYPE need_yield2 = 0; portBASE_TYPE user_need_yield = 0; lldesc_t *finish_desc; uint32_t dummy; finish_desc = (lldesc_t *)(event_data->tx_eof_desc_addr); i2s_event_data_t evt = { .data = &(finish_desc->buf), .size = handle->dma.buf_size, }; if (handle->callbacks.on_sent) { user_need_yield |= handle->callbacks.on_sent(handle, &evt, handle->user_data); } if (xQueueIsQueueFullFromISR(handle->msg_queue)) { xQueueReceiveFromISR(handle->msg_queue, &dummy, &need_yield1); if (handle->callbacks.on_send_q_ovf) { evt.data = NULL; user_need_yield |= handle->callbacks.on_send_q_ovf(handle, &evt, handle->user_data); } } xQueueSendFromISR(handle->msg_queue, &(finish_desc->buf), &need_yield2); if (handle->dma.auto_clear) { uint8_t *sent_buf = (uint8_t *)finish_desc->buf; memset(sent_buf, 0, handle->dma.buf_size); } return need_yield1 | need_yield2 | user_need_yield; } #else static void IRAM_ATTR i2s_dma_rx_callback(void *arg) { portBASE_TYPE need_yield1 = 0; portBASE_TYPE need_yield2 = 0; portBASE_TYPE user_need_yield = 0; lldesc_t *finish_desc = NULL; i2s_event_data_t evt; i2s_chan_handle_t handle = (i2s_chan_handle_t)arg; uint32_t dummy; uint32_t status = i2s_hal_get_intr_status(&(handle->controller->hal)); i2s_hal_clear_intr_status(&(handle->controller->hal), status); if (!status) { return; } if (handle && (status & I2S_LL_EVENT_RX_EOF)) { i2s_hal_get_in_eof_des_addr(&(handle->controller->hal), (uint32_t *)&finish_desc); evt.data = &(finish_desc->buf); evt.size = handle->dma.buf_size; if (handle->callbacks.on_recv) { user_need_yield |= handle->callbacks.on_recv(handle, &evt, handle->user_data); } if (xQueueIsQueueFullFromISR(handle->msg_queue)) { xQueueReceiveFromISR(handle->msg_queue, &dummy, &need_yield1); if (handle->callbacks.on_recv_q_ovf) { evt.data = NULL; user_need_yield |= handle->callbacks.on_recv_q_ovf(handle, &evt, handle->user_data); } } xQueueSendFromISR(handle->msg_queue, &(finish_desc->buf), &need_yield2); } if (need_yield1 || need_yield2 || user_need_yield) { portYIELD_FROM_ISR(); } } static void IRAM_ATTR i2s_dma_tx_callback(void *arg) { portBASE_TYPE need_yield1 = 0; portBASE_TYPE need_yield2 = 0; portBASE_TYPE user_need_yield = 0; lldesc_t *finish_desc = NULL; i2s_event_data_t evt; i2s_chan_handle_t handle = (i2s_chan_handle_t)arg; uint32_t dummy; uint32_t status = i2s_hal_get_intr_status(&(handle->controller->hal)); i2s_hal_clear_intr_status(&(handle->controller->hal), status); if (!status) { return; } if (handle && (status & I2S_LL_EVENT_TX_EOF)) { i2s_hal_get_out_eof_des_addr(&(handle->controller->hal), (uint32_t *)&finish_desc); evt.data = &(finish_desc->buf); evt.size = handle->dma.buf_size; if (handle->callbacks.on_sent) { user_need_yield |= handle->callbacks.on_sent(handle, &evt, handle->user_data); } if (xQueueIsQueueFullFromISR(handle->msg_queue)) { xQueueReceiveFromISR(handle->msg_queue, &dummy, &need_yield1); if (handle->callbacks.on_send_q_ovf) { evt.data = NULL; user_need_yield |= handle->callbacks.on_send_q_ovf(handle, &evt, handle->user_data); } } xQueueSendFromISR(handle->msg_queue, &(finish_desc->buf), &need_yield2); // Auto clear the dma buffer after data sent if (handle->dma.auto_clear) { uint8_t *buff = (uint8_t *)finish_desc->buf; memset(buff, 0, handle->dma.buf_size); } } if (need_yield1 || need_yield2 || user_need_yield) { portYIELD_FROM_ISR(); } } #endif /** * @brief I2S DMA interrupt initialization * @note I2S will use GDMA if chip supports, and the interrupt is triggered by GDMA. * * @param handle I2S channel handle * @param intr_flag Interrupt allocation flag * @return * - ESP_OK I2S DMA interrupt initialize success * - ESP_ERR_NOT_FOUND GDMA channel not found * - ESP_ERR_INVALID_ARG Invalid arguments * - ESP_ERR_INVALID_STATE GDMA state error */ esp_err_t i2s_init_dma_intr(i2s_chan_handle_t handle, int intr_flag) { i2s_port_t port_id = handle->controller->id; ESP_RETURN_ON_FALSE((port_id >= 0) && (port_id < SOC_I2S_NUM), ESP_ERR_INVALID_ARG, TAG, "invalid handle"); #if SOC_GDMA_SUPPORTED /* Set GDMA trigger module */ gdma_trigger_t trig = {.periph = GDMA_TRIG_PERIPH_I2S}; switch (port_id) { #if SOC_I2S_NUM > 1 case I2S_NUM_1: trig.instance_id = SOC_GDMA_TRIG_PERIPH_I2S1; break; #endif default: trig.instance_id = SOC_GDMA_TRIG_PERIPH_I2S0; break; } /* Set GDMA config */ gdma_channel_alloc_config_t dma_cfg = {}; if (handle->dir == I2S_DIR_TX) { dma_cfg.direction = GDMA_CHANNEL_DIRECTION_TX; /* Register a new GDMA tx channel */ ESP_RETURN_ON_ERROR(gdma_new_channel(&dma_cfg, &handle->dma.dma_chan), TAG, "Register tx dma channel error"); ESP_RETURN_ON_ERROR(gdma_connect(handle->dma.dma_chan, trig), TAG, "Connect tx dma channel error"); gdma_tx_event_callbacks_t cb = {.on_trans_eof = i2s_dma_tx_callback}; /* Set callback function for GDMA, the interrupt is triggered by GDMA, then the GDMA ISR will call the callback function */ gdma_register_tx_event_callbacks(handle->dma.dma_chan, &cb, handle); } else { dma_cfg.direction = GDMA_CHANNEL_DIRECTION_RX; /* Register a new GDMA rx channel */ ESP_RETURN_ON_ERROR(gdma_new_channel(&dma_cfg, &handle->dma.dma_chan), TAG, "Register rx dma channel error"); ESP_RETURN_ON_ERROR(gdma_connect(handle->dma.dma_chan, trig), TAG, "Connect rx dma channel error"); gdma_rx_event_callbacks_t cb = {.on_recv_eof = i2s_dma_rx_callback}; /* Set callback function for GDMA, the interrupt is triggered by GDMA, then the GDMA ISR will call the callback function */ gdma_register_rx_event_callbacks(handle->dma.dma_chan, &cb, handle); } #else intr_flag |= ESP_INTR_FLAG_SHARED; /* Initialize I2S module interrupt */ if (handle->dir == I2S_DIR_TX) { esp_intr_alloc_intrstatus(i2s_periph_signal[port_id].irq, intr_flag, (uint32_t)i2s_ll_get_interrupt_status_reg(handle->controller->hal.dev), I2S_LL_TX_EVENT_MASK, i2s_dma_tx_callback, handle, &handle->dma.dma_chan); } else { esp_intr_alloc_intrstatus(i2s_periph_signal[port_id].irq, intr_flag, (uint32_t)i2s_ll_get_interrupt_status_reg(handle->controller->hal.dev), I2S_LL_RX_EVENT_MASK, i2s_dma_rx_callback, handle, &handle->dma.dma_chan); } /* Start DMA */ i2s_ll_enable_dma(handle->controller->hal.dev, true); #endif // SOC_GDMA_SUPPORTED return ESP_OK; } void i2s_gpio_check_and_set(gpio_num_t gpio, uint32_t signal_idx, bool is_input, bool is_invert) { /* Ignore the pin if pin = I2S_GPIO_UNUSED */ if (gpio != I2S_GPIO_UNUSED) { gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[gpio], PIN_FUNC_GPIO); if (is_input) { /* Set direction, for some GPIOs, the input function are not enabled as default */ gpio_set_direction(gpio, GPIO_MODE_INPUT); esp_rom_gpio_connect_in_signal(gpio, signal_idx, is_invert); } else { gpio_set_direction(gpio, GPIO_MODE_OUTPUT); esp_rom_gpio_connect_out_signal(gpio, signal_idx, is_invert, 0); } } } void i2s_gpio_loopback_set(gpio_num_t gpio, uint32_t out_sig_idx, uint32_t in_sig_idx) { if (gpio != I2S_GPIO_UNUSED) { gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[gpio], PIN_FUNC_GPIO); gpio_set_direction(gpio, GPIO_MODE_INPUT_OUTPUT); esp_rom_gpio_connect_out_signal(gpio, out_sig_idx, 0, 0); esp_rom_gpio_connect_in_signal(gpio, in_sig_idx, 0); } } esp_err_t i2s_check_set_mclk(i2s_port_t id, gpio_num_t gpio_num, bool is_apll, bool is_invert) { if (gpio_num == I2S_GPIO_UNUSED) { return ESP_OK; } #if CONFIG_IDF_TARGET_ESP32 ESP_RETURN_ON_FALSE((gpio_num == GPIO_NUM_0 || gpio_num == GPIO_NUM_1 || gpio_num == GPIO_NUM_3), ESP_ERR_INVALID_ARG, TAG, "ESP32 only support to set GPIO0/GPIO1/GPIO3 as mclk signal, error GPIO number:%d", gpio_num); bool is_i2s0 = id == I2S_NUM_0; if (gpio_num == GPIO_NUM_0) { gpio_hal_iomux_func_sel(PERIPHS_IO_MUX_GPIO0_U, FUNC_GPIO0_CLK_OUT1); gpio_ll_iomux_pin_ctrl(is_apll ? 0xFFF6 : (is_i2s0 ? 0xFFF0 : 0xFFFF)); } else if (gpio_num == GPIO_NUM_1) { gpio_hal_iomux_func_sel(PERIPHS_IO_MUX_U0TXD_U, FUNC_U0TXD_CLK_OUT3); gpio_ll_iomux_pin_ctrl(is_apll ? 0xF6F6 : (is_i2s0 ? 0xF0F0 : 0xF0FF)); } else { gpio_hal_iomux_func_sel(PERIPHS_IO_MUX_U0RXD_U, FUNC_U0RXD_CLK_OUT2); gpio_ll_iomux_pin_ctrl(is_apll ? 0xFF66 : (is_i2s0 ? 0xFF00 : 0xFF0F)); } #else ESP_RETURN_ON_FALSE(GPIO_IS_VALID_GPIO(gpio_num), ESP_ERR_INVALID_ARG, TAG, "mck_io_num invalid"); i2s_gpio_check_and_set(gpio_num, i2s_periph_signal[id].mck_out_sig, false, is_invert); #endif ESP_LOGD(TAG, "MCLK is pinned to GPIO%d on I2S%d", id, gpio_num); return ESP_OK; } /*--------------------------------------------------------------------------- I2S bus Public APIs ---------------------------------------------------------------------------- Scope: Public ----------------------------------------------------------------------------*/ esp_err_t i2s_new_channel(const i2s_chan_config_t *chan_cfg, i2s_chan_handle_t *tx_handle, i2s_chan_handle_t *rx_handle) { #if CONFIG_I2S_ENABLE_DEBUG_LOG esp_log_level_set(TAG, ESP_LOG_DEBUG); #endif /* Parameter validity check */ I2S_NULL_POINTER_CHECK(TAG, chan_cfg); I2S_NULL_POINTER_CHECK(TAG, tx_handle || rx_handle); ESP_RETURN_ON_FALSE(chan_cfg->id < SOC_I2S_NUM || chan_cfg->id == I2S_NUM_AUTO, ESP_ERR_INVALID_ARG, TAG, "invalid I2S port id"); ESP_RETURN_ON_FALSE(chan_cfg->dma_desc_num >= 2, ESP_ERR_INVALID_ARG, TAG, "there should be at least 2 DMA buffers"); esp_err_t ret = ESP_OK; i2s_controller_t *i2s_obj = NULL; i2s_port_t id = chan_cfg->id; bool channel_found = false; uint8_t chan_search_mask = 0; chan_search_mask |= tx_handle ? I2S_DIR_TX : 0; chan_search_mask |= rx_handle ? I2S_DIR_RX : 0; /* Channel will be registered to one i2s port automatically if id is I2S_NUM_AUTO * Otherwise, the channel will be registered to the specific port. */ if (id == I2S_NUM_AUTO) { for (int i = 0; i < SOC_I2S_NUM && !channel_found; i++) { i2s_obj = i2s_acquire_controller_obj(i); if (!i2s_obj) { continue; } channel_found = i2s_take_available_channel(i2s_obj, chan_search_mask); } ESP_RETURN_ON_FALSE(i2s_obj, ESP_ERR_NOT_FOUND, TAG, "get i2s object failed"); } else { i2s_obj = i2s_acquire_controller_obj(id); ESP_RETURN_ON_FALSE(i2s_obj, ESP_ERR_NOT_FOUND, TAG, "get i2s object failed"); channel_found = i2s_take_available_channel(i2s_obj, chan_search_mask); } ESP_GOTO_ON_FALSE(channel_found, ESP_ERR_NOT_FOUND, err, TAG, "no available channel found"); /* Register and specify the tx handle */ if (tx_handle) { ESP_GOTO_ON_ERROR(i2s_register_channel(i2s_obj, I2S_DIR_TX, chan_cfg->dma_desc_num), err, TAG, "register I2S tx channel failed"); i2s_obj->tx_chan->role = chan_cfg->role; i2s_obj->tx_chan->dma.auto_clear = chan_cfg->auto_clear; i2s_obj->tx_chan->dma.desc_num = chan_cfg->dma_desc_num; i2s_obj->tx_chan->dma.frame_num = chan_cfg->dma_frame_num; i2s_obj->tx_chan->start = i2s_tx_channel_start; i2s_obj->tx_chan->stop = i2s_tx_channel_stop; *tx_handle = i2s_obj->tx_chan; ESP_LOGD(TAG, "tx channel is registered on I2S%d successfully", i2s_obj->id); } /* Register and specify the rx handle */ if (rx_handle) { ESP_GOTO_ON_ERROR(i2s_register_channel(i2s_obj, I2S_DIR_RX, chan_cfg->dma_desc_num), err, TAG, "register I2S rx channel failed"); i2s_obj->rx_chan->role = chan_cfg->role; i2s_obj->rx_chan->dma.desc_num = chan_cfg->dma_desc_num; i2s_obj->rx_chan->dma.frame_num = chan_cfg->dma_frame_num; i2s_obj->rx_chan->start = i2s_rx_channel_start; i2s_obj->rx_chan->stop = i2s_rx_channel_stop; *rx_handle = i2s_obj->rx_chan; ESP_LOGD(TAG, "rx channel is registered on I2S%d successfully", i2s_obj->id); } if ((tx_handle != NULL) && (rx_handle != NULL)) { i2s_obj->full_duplex = true; } return ESP_OK; /* i2s_obj allocated but register channel failed */ err: /* if the controller object has no channel, find the corresponding global object and destroy it */ if (i2s_obj != NULL && i2s_obj->rx_chan == NULL && i2s_obj->tx_chan == NULL) { for (int i = 0; i < SOC_I2S_NUM; i++) { if (i2s_obj == g_i2s.controller[i]) { i2s_destroy_controller_obj(&g_i2s.controller[i]); break; } } } return ret; } esp_err_t i2s_del_channel(i2s_chan_handle_t handle) { I2S_NULL_POINTER_CHECK(TAG, handle); ESP_RETURN_ON_FALSE(handle->state < I2S_CHAN_STATE_RUNNING, ESP_ERR_INVALID_STATE, TAG, "the channel can't be deleted unless it is disabled"); i2s_controller_t *i2s_obj = handle->controller; int __attribute__((unused)) id = i2s_obj->id; i2s_dir_t __attribute__((unused)) dir = handle->dir; bool is_bound = true; #if SOC_I2S_HW_VERSION_2 if (dir == I2S_DIR_TX) { i2s_ll_tx_disable_clock(handle->controller->hal.dev); } else { i2s_ll_rx_disable_clock(handle->controller->hal.dev); } #endif #if SOC_I2S_SUPPORTS_APLL if (handle->apll_en) { /* Must switch back to D2CLK on ESP32-S2, * because the clock of some registers are bound to APLL, * otherwise, once APLL is disabled, the registers can't be updated anymore */ if (handle->dir == I2S_DIR_TX) { i2s_ll_tx_clk_set_src(handle->controller->hal.dev, I2S_CLK_SRC_DEFAULT); } else { i2s_ll_rx_clk_set_src(handle->controller->hal.dev, I2S_CLK_SRC_DEFAULT); } periph_rtc_apll_release(); } #endif #if CONFIG_PM_ENABLE if (handle->pm_lock) { esp_pm_lock_delete(handle->pm_lock); } #endif if (handle->mode_info) { free(handle->mode_info); } if (handle->dma.desc) { i2s_free_dma_desc(handle); } #if CONFIG_I2S_ISR_IRAM_SAFE if (handle->msg_que_storage) { free(handle->msg_que_storage); } if (handle->msg_que_struct) { free(handle->msg_que_struct); } if (handle->mutex) { free(handle->mutex_struct); } if (handle->binary_struct) { free(handle->binary_struct); } #endif if (handle->msg_queue) { vQueueDelete(handle->msg_queue); } if (handle->mutex) { vSemaphoreDelete(handle->mutex); } if (handle->binary) { vSemaphoreDelete(handle->binary); } #if SOC_I2S_HW_VERSION_1 i2s_obj->chan_occupancy = 0; #else i2s_obj->chan_occupancy &= ~(uint32_t)dir; #endif if (handle->dma.dma_chan) { #if SOC_GDMA_SUPPORTED gdma_del_channel(handle->dma.dma_chan); #else esp_intr_free(handle->dma.dma_chan); #endif } if (handle == i2s_obj->tx_chan) { free(i2s_obj->tx_chan); i2s_obj->tx_chan = NULL; i2s_obj->full_duplex = false; } else if (handle == i2s_obj->rx_chan) { free(i2s_obj->rx_chan); i2s_obj->rx_chan = NULL; i2s_obj->full_duplex = false; } else { /* Indicate the delete channel is an unbound free channel */ is_bound = false; free(handle); } /* If the delete channel was bound to a controller before, we need to destroy this controller object if there is no channel any more */ if (is_bound) { if (!(i2s_obj->tx_chan) && !(i2s_obj->rx_chan)) { i2s_destroy_controller_obj(&g_i2s.controller[i2s_obj->id]); } ESP_LOGD(TAG, "%s channel on I2S%d deleted", dir == I2S_DIR_TX ? "tx" : "rx", id); } return ESP_OK; } esp_err_t i2s_channel_get_info(i2s_chan_handle_t handle, i2s_chan_info_t *chan_info) { I2S_NULL_POINTER_CHECK(TAG, handle); I2S_NULL_POINTER_CHECK(TAG, chan_info); /* Find whether the handle is a registered i2s handle or still available */ for (int i = 0; i < SOC_I2S_NUM; i++) { if (g_i2s.controller[i] != NULL) { if (g_i2s.controller[i]->tx_chan == handle || g_i2s.controller[i]->rx_chan == handle) { goto found; } } } return ESP_ERR_NOT_FOUND; found: /* Assign the handle information */ xSemaphoreTake(handle->mutex, portMAX_DELAY); chan_info->id = handle->controller->id; chan_info->dir = handle->dir; chan_info->role = handle->role; chan_info->mode = handle->mode; if (handle->controller->full_duplex) { if (handle->dir == I2S_DIR_TX) { chan_info->pair_chan = handle->controller->rx_chan; } else { chan_info->pair_chan = handle->controller->tx_chan; } } else { chan_info->pair_chan = NULL; } xSemaphoreGive(handle->mutex); return ESP_OK; } esp_err_t i2s_channel_enable(i2s_chan_handle_t handle) { I2S_NULL_POINTER_CHECK(TAG, handle); esp_err_t ret = ESP_OK; xSemaphoreTake(handle->mutex, portMAX_DELAY); ESP_GOTO_ON_FALSE(handle->state == I2S_CHAN_STATE_READY, ESP_ERR_INVALID_STATE, err, TAG, "the channel has already enabled or not initialized"); #if CONFIG_PM_ENABLE esp_pm_lock_acquire(handle->pm_lock); #endif handle->dma.curr_ptr = NULL; handle->dma.rw_pos = 0; handle->start(handle); handle->state = I2S_CHAN_STATE_RUNNING; /* Reset queue */ xQueueReset(handle->msg_queue); xSemaphoreGive(handle->mutex); /* Give the binary semaphore to enable reading / writing task */ xSemaphoreGive(handle->binary); ESP_LOGD(TAG, "i2s %s channel enabled", handle->dir == I2S_DIR_TX ? "tx" : "rx"); return ret; err: xSemaphoreGive(handle->mutex); return ret; } esp_err_t i2s_channel_disable(i2s_chan_handle_t handle) { I2S_NULL_POINTER_CHECK(TAG, handle); esp_err_t ret = ESP_OK; xSemaphoreTake(handle->mutex, portMAX_DELAY); ESP_GOTO_ON_FALSE(handle->state > I2S_CHAN_STATE_READY, ESP_ERR_INVALID_STATE, err, TAG, "the channel has not been enabled yet"); /* Update the state to force quit the current reading/wrinting operation */ handle->state = I2S_CHAN_STATE_READY; /* Waiting for reading/wrinting operation quit */ xSemaphoreTake(handle->binary, portMAX_DELAY); handle->stop(handle); #if CONFIG_PM_ENABLE esp_pm_lock_release(handle->pm_lock); #endif xSemaphoreGive(handle->mutex); ESP_LOGD(TAG, "i2s %s channel disabled", handle->dir == I2S_DIR_TX ? "tx" : "rx"); return ret; err: xSemaphoreGive(handle->mutex); return ret; } esp_err_t i2s_channel_write(i2s_chan_handle_t handle, const void *src, size_t size, size_t *bytes_written, uint32_t timeout_ms) { I2S_NULL_POINTER_CHECK(TAG, handle); ESP_RETURN_ON_FALSE(handle->dir == I2S_DIR_TX, ESP_ERR_INVALID_ARG, TAG, "this channel is not tx channel"); esp_err_t ret = ESP_OK; char *data_ptr; char *src_byte; size_t bytes_can_write; *bytes_written = 0; /* The binary semaphore can only be taken when the channel has been enabled and no other writing operation in progress */ ESP_RETURN_ON_FALSE(xSemaphoreTake(handle->binary, pdMS_TO_TICKS(timeout_ms)) == pdTRUE, ESP_ERR_INVALID_STATE, TAG, "The channel is not enabled"); src_byte = (char *)src; while (size > 0 && handle->state == I2S_CHAN_STATE_RUNNING) { if (handle->dma.rw_pos == handle->dma.buf_size || handle->dma.curr_ptr == NULL) { if (xQueueReceive(handle->msg_queue, &(handle->dma.curr_ptr), pdMS_TO_TICKS(timeout_ms)) == pdFALSE) { ret = ESP_ERR_TIMEOUT; break; } handle->dma.rw_pos = 0; } data_ptr = (char *)handle->dma.curr_ptr; data_ptr += handle->dma.rw_pos; bytes_can_write = handle->dma.buf_size - handle->dma.rw_pos; if (bytes_can_write > size) { bytes_can_write = size; } memcpy(data_ptr, src_byte, bytes_can_write); size -= bytes_can_write; src_byte += bytes_can_write; handle->dma.rw_pos += bytes_can_write; (*bytes_written) += bytes_can_write; } xSemaphoreGive(handle->binary); return ret; } esp_err_t i2s_channel_read(i2s_chan_handle_t handle, void *dest, size_t size, size_t *bytes_read, uint32_t timeout_ms) { I2S_NULL_POINTER_CHECK(TAG, handle); ESP_RETURN_ON_FALSE(handle->dir == I2S_DIR_RX, ESP_ERR_INVALID_ARG, TAG, "this channel is not rx channel"); esp_err_t ret = ESP_OK; uint8_t *data_ptr; uint8_t *dest_byte; int bytes_can_read; *bytes_read = 0; dest_byte = (uint8_t *)dest; /* The binary semaphore can only be taken when the channel has been enabled and no other reading operation in progress */ ESP_RETURN_ON_FALSE(xSemaphoreTake(handle->binary, pdMS_TO_TICKS(timeout_ms)) == pdTRUE, ESP_ERR_INVALID_STATE, TAG, "The channel is not enabled"); while (size > 0 && handle->state == I2S_CHAN_STATE_RUNNING) { if (handle->dma.rw_pos == handle->dma.buf_size || handle->dma.curr_ptr == NULL) { if (xQueueReceive(handle->msg_queue, &(handle->dma.curr_ptr), pdMS_TO_TICKS(timeout_ms)) == pdFALSE) { ret = ESP_ERR_TIMEOUT; break; } handle->dma.rw_pos = 0; } data_ptr = (uint8_t *)handle->dma.curr_ptr; data_ptr += handle->dma.rw_pos; bytes_can_read = handle->dma.buf_size - handle->dma.rw_pos; if (bytes_can_read > (int)size) { bytes_can_read = size; } memcpy(dest_byte, data_ptr, bytes_can_read); size -= bytes_can_read; dest_byte += bytes_can_read; handle->dma.rw_pos += bytes_can_read; (*bytes_read) += bytes_can_read; } xSemaphoreGive(handle->binary); return ret; } /*--------------------------------------------------------------------------- I2S Platform APIs ---------------------------------------------------------------------------- Scope: This file and ADC/DAC/LCD driver ----------------------------------------------------------------------------*/ esp_err_t i2s_platform_acquire_occupation(int id, const char *comp_name) { esp_err_t ret = ESP_OK; const char *occupied_comp = NULL; ESP_RETURN_ON_FALSE(id < SOC_I2S_NUM, ESP_ERR_INVALID_ARG, TAG, "invalid i2s port id"); portENTER_CRITICAL(&g_i2s.spinlock); if ((!g_i2s.controller[id]) && (g_i2s.comp_name[id] == NULL)) { g_i2s.comp_name[id] = comp_name; /* Enable module clock */ periph_module_enable(i2s_periph_signal[id].module); i2s_ll_enable_clock(I2S_LL_GET_HW(id)); } else { occupied_comp = g_i2s.comp_name[id]; ret = ESP_ERR_NOT_FOUND; } portEXIT_CRITICAL(&g_i2s.spinlock); if (occupied_comp != NULL) { ESP_LOGE(TAG, "i2s controller %d has been occupied by %s", id, occupied_comp); } return ret; } esp_err_t i2s_platform_release_occupation(int id) { esp_err_t ret = ESP_OK; ESP_RETURN_ON_FALSE(id < SOC_I2S_NUM, ESP_ERR_INVALID_ARG, TAG, "invalid i2s port id"); portENTER_CRITICAL(&g_i2s.spinlock); if (!g_i2s.controller[id]) { g_i2s.comp_name[id] = NULL; /* Disable module clock */ periph_module_disable(i2s_periph_signal[id].module); i2s_ll_disable_clock(I2S_LL_GET_HW(id)); } else { ret = ESP_ERR_INVALID_STATE; } portEXIT_CRITICAL(&g_i2s.spinlock); return ret; } // Only used in `test_i2s_iram.c` to write DMA buffer directly size_t inline i2s_platform_get_dma_buffer_offset(void) { /* Force to transfer address '0' into 'i2s_chan_handle_t' type, * then find the corresponding field , the address of this field is the offset of this type */ return (size_t)&(((i2s_chan_handle_t)0)->dma.bufs); }