esp-idf/components/driver/i2s/i2s_tdm.c

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/*
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* SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
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*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
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#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
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#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
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#include "hal/i2s_hal.h"
#include "driver/gpio.h"
#include "driver/i2s_tdm.h"
#include "i2s_private.h"
#include "clk_ctrl_os.h"
#include "esp_intr_alloc.h"
#include "esp_check.h"
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const static char *TAG = "i2s_tdm";
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// Same with standard mode except total slot number
static esp_err_t i2s_tdm_calculate_clock(i2s_chan_handle_t handle, const i2s_tdm_clk_config_t *clk_cfg, i2s_hal_clock_info_t *clk_info)
{
uint32_t rate = clk_cfg->sample_rate_hz;
i2s_tdm_slot_config_t *slot_cfg = &((i2s_tdm_config_t *)(handle->mode_info))->slot_cfg;
uint32_t slot_bits = (slot_cfg->slot_bit_width == I2S_SLOT_BIT_WIDTH_AUTO) ||
((int)slot_cfg->slot_bit_width < (int)slot_cfg->data_bit_width) ?
slot_cfg->data_bit_width : slot_cfg->slot_bit_width;
/* Calculate multiple
* Fmclk = bck_div*fbck = fsclk/(mclk_div+b/a) */
if (handle->role == I2S_ROLE_MASTER) {
clk_info->bclk = rate * handle->total_slot * slot_bits;
clk_info->mclk = rate * clk_cfg->mclk_multiple;
clk_info->bclk_div = clk_info->mclk / clk_info->bclk;
/* While RECEIVING multiple slots, the data will go wrong if the bclk_div is equal or smaller than 2 */
if (clk_info->bclk_div <= 2) {
clk_info->bclk_div = 3;
clk_info->mclk = clk_info->bclk * clk_info->bclk_div;
ESP_LOGW(TAG, "the current mclk multiple is too small, adjust the mclk multiple to %"PRIu32, clk_info->mclk / rate);
}
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} else {
if (clk_cfg->bclk_div < 8) {
ESP_LOGW(TAG, "the current bclk division is too small, adjust the bclk division to 8");
clk_info->bclk_div = 8;
} else {
clk_info->bclk_div = clk_cfg->bclk_div;
}
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clk_info->bclk = rate * handle->total_slot * slot_bits;
clk_info->mclk = clk_info->bclk * clk_info->bclk_div;
}
clk_info->sclk = clk_cfg->clk_src == I2S_CLK_SRC_EXTERNAL ?
clk_cfg->ext_clk_freq_hz : i2s_get_source_clk_freq(clk_cfg->clk_src, clk_info->mclk);
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clk_info->mclk_div = clk_info->sclk / clk_info->mclk;
/* Check if the configuration is correct */
ESP_RETURN_ON_FALSE(clk_info->mclk_div, ESP_ERR_INVALID_ARG, TAG, "sample rate is too large for the current clock source");
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return ESP_OK;
}
static esp_err_t i2s_tdm_set_clock(i2s_chan_handle_t handle, const i2s_tdm_clk_config_t *clk_cfg)
{
esp_err_t ret = ESP_OK;
i2s_tdm_config_t *tdm_cfg = (i2s_tdm_config_t *)(handle->mode_info);
i2s_hal_clock_info_t clk_info;
/* Calculate clock parameters */
ESP_RETURN_ON_ERROR(i2s_tdm_calculate_clock(handle, clk_cfg, &clk_info), TAG, "clock calculate failed");
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ESP_LOGD(TAG, "Clock division info: [sclk] %"PRIu32" Hz [mdiv] %d [mclk] %"PRIu32" Hz [bdiv] %d [bclk] %"PRIu32" Hz",
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clk_info.sclk, clk_info.mclk_div, clk_info.mclk, clk_info.bclk_div, clk_info.bclk);
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portENTER_CRITICAL(&g_i2s.spinlock);
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/* Set clock configurations in HAL*/
I2S_CLOCK_SRC_ATOMIC() {
if (handle->dir == I2S_DIR_TX) {
i2s_hal_set_tx_clock(&handle->controller->hal, &clk_info, clk_cfg->clk_src);
} else {
i2s_hal_set_rx_clock(&handle->controller->hal, &clk_info, clk_cfg->clk_src);
}
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}
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portEXIT_CRITICAL(&g_i2s.spinlock);
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/* Update the mode info: clock configuration */
memcpy(&(tdm_cfg->clk_cfg), clk_cfg, sizeof(i2s_tdm_clk_config_t));
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return ret;
}
static esp_err_t i2s_tdm_set_slot(i2s_chan_handle_t handle, const i2s_tdm_slot_config_t *slot_cfg)
{
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ESP_RETURN_ON_FALSE(slot_cfg->slot_mask, ESP_ERR_INVALID_ARG, TAG, "At least one channel should be enabled");
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/* Update the total slot num and active slot num */
handle->active_slot = slot_cfg->slot_mode == I2S_SLOT_MODE_MONO ? 1 : __builtin_popcount(slot_cfg->slot_mask);
uint32_t max_slot_num = 32 - __builtin_clz(slot_cfg->slot_mask);
handle->total_slot = slot_cfg->total_slot < max_slot_num ? max_slot_num : slot_cfg->total_slot;
handle->total_slot = handle->total_slot < 2 ? 2 : handle->total_slot; // At least two slots in a frame
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uint32_t buf_size = i2s_get_buf_size(handle, slot_cfg->data_bit_width, handle->dma.frame_num);
/* The DMA buffer need to re-allocate if the buffer size changed */
if (handle->dma.buf_size != buf_size) {
handle->dma.buf_size = buf_size;
ESP_RETURN_ON_ERROR(i2s_free_dma_desc(handle), TAG, "failed to free the old dma descriptor");
ESP_RETURN_ON_ERROR(i2s_alloc_dma_desc(handle, handle->dma.desc_num, buf_size),
TAG, "allocate memory for dma descriptor failed");
}
bool is_slave = handle->role == I2S_ROLE_SLAVE;
/* Share bck and ws signal in full-duplex mode */
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if (handle->controller->full_duplex) {
i2s_ll_share_bck_ws(handle->controller->hal.dev, true);
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/* Since bck and ws are shared, only tx or rx can be master
Force to set rx as slave to avoid conflict of clock signal */
if (handle->dir == I2S_DIR_RX) {
is_slave = true;
}
} else {
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i2s_ll_share_bck_ws(handle->controller->hal.dev, false);
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}
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portENTER_CRITICAL(&g_i2s.spinlock);
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/* Configure the hardware to apply TDM format */
if (handle->dir == I2S_DIR_TX) {
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i2s_hal_tdm_set_tx_slot(&(handle->controller->hal), is_slave, (i2s_hal_slot_config_t *)slot_cfg);
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} else {
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i2s_hal_tdm_set_rx_slot(&(handle->controller->hal), is_slave, (i2s_hal_slot_config_t *)slot_cfg);
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}
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portEXIT_CRITICAL(&g_i2s.spinlock);
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/* Update the mode info: slot configuration */
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i2s_tdm_config_t *tdm_cfg = (i2s_tdm_config_t *)(handle->mode_info);
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memcpy(&(tdm_cfg->slot_cfg), slot_cfg, sizeof(i2s_tdm_slot_config_t));
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return ESP_OK;
}
static esp_err_t i2s_tdm_set_gpio(i2s_chan_handle_t handle, const i2s_tdm_gpio_config_t *gpio_cfg)
{
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int id = handle->controller->id;
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/* Check validity of selected pins */
ESP_RETURN_ON_FALSE((gpio_cfg->bclk == -1 || GPIO_IS_VALID_GPIO(gpio_cfg->bclk)),
ESP_ERR_INVALID_ARG, TAG, "bclk invalid");
ESP_RETURN_ON_FALSE((gpio_cfg->ws == -1 || GPIO_IS_VALID_GPIO(gpio_cfg->ws)),
ESP_ERR_INVALID_ARG, TAG, "ws invalid");
i2s_tdm_config_t *tdm_cfg = (i2s_tdm_config_t *)(handle->mode_info);
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/* Loopback if dout = din */
if (gpio_cfg->dout != -1 &&
gpio_cfg->dout == gpio_cfg->din) {
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i2s_gpio_loopback_set(gpio_cfg->dout, i2s_periph_signal[id].data_out_sig, i2s_periph_signal[id].data_in_sig);
} else if (handle->dir == I2S_DIR_TX) {
/* Set data output GPIO */
i2s_gpio_check_and_set(gpio_cfg->dout, i2s_periph_signal[id].data_out_sig, false, false);
} else {
/* Set data input GPIO */
i2s_gpio_check_and_set(gpio_cfg->din, i2s_periph_signal[id].data_in_sig, true, false);
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}
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/* Set mclk pin */
ESP_RETURN_ON_ERROR(i2s_check_set_mclk(id, gpio_cfg->mclk, tdm_cfg->clk_cfg.clk_src, gpio_cfg->invert_flags.mclk_inv), TAG, "mclk config failed");
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if (handle->role == I2S_ROLE_SLAVE) {
/* For "tx + slave" mode, select TX signal index for ws and bck */
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if (handle->dir == I2S_DIR_TX && !handle->controller->full_duplex) {
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#if SOC_I2S_HW_VERSION_2
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i2s_ll_mclk_bind_to_tx_clk(handle->controller->hal.dev);
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#endif
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i2s_gpio_check_and_set(gpio_cfg->ws, i2s_periph_signal[id].s_tx_ws_sig, true, gpio_cfg->invert_flags.ws_inv);
i2s_gpio_check_and_set(gpio_cfg->bclk, i2s_periph_signal[id].s_tx_bck_sig, true, gpio_cfg->invert_flags.bclk_inv);
/* For "tx + rx + slave" or "rx + slave" mode, select RX signal index for ws and bck */
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} else {
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i2s_gpio_check_and_set(gpio_cfg->ws, i2s_periph_signal[id].s_rx_ws_sig, true, gpio_cfg->invert_flags.ws_inv);
i2s_gpio_check_and_set(gpio_cfg->bclk, i2s_periph_signal[id].s_rx_bck_sig, true, gpio_cfg->invert_flags.bclk_inv);
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}
} else {
/* For "rx + master" mode, select RX signal index for ws and bck */
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if (handle->dir == I2S_DIR_RX && !handle->controller->full_duplex) {
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#if SOC_I2S_HW_VERSION_2
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i2s_ll_mclk_bind_to_rx_clk(handle->controller->hal.dev);
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#endif
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i2s_gpio_check_and_set(gpio_cfg->ws, i2s_periph_signal[id].m_rx_ws_sig, false, gpio_cfg->invert_flags.ws_inv);
i2s_gpio_check_and_set(gpio_cfg->bclk, i2s_periph_signal[id].m_rx_bck_sig, false, gpio_cfg->invert_flags.bclk_inv);
/* For "tx + rx + master" or "tx + master" mode, select TX signal index for ws and bck */
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} else {
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i2s_gpio_check_and_set(gpio_cfg->ws, i2s_periph_signal[id].m_tx_ws_sig, false, gpio_cfg->invert_flags.ws_inv);
i2s_gpio_check_and_set(gpio_cfg->bclk, i2s_periph_signal[id].m_tx_bck_sig, false, gpio_cfg->invert_flags.bclk_inv);
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}
}
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/* Update the mode info: gpio configuration */
memcpy(&(tdm_cfg->gpio_cfg), gpio_cfg, sizeof(i2s_tdm_gpio_config_t));
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return ESP_OK;
}
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esp_err_t i2s_channel_init_tdm_mode(i2s_chan_handle_t handle, const i2s_tdm_config_t *tdm_cfg)
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{
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#if CONFIG_I2S_ENABLE_DEBUG_LOG
esp_log_level_set(TAG, ESP_LOG_DEBUG);
#endif
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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_REGISTER, ESP_ERR_INVALID_STATE, err, TAG, "the channel has initialized already");
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handle->mode = I2S_COMM_MODE_TDM;
/* Allocate memory for storing the configurations of TDM mode */
if (handle->mode_info) {
free(handle->mode_info);
}
handle->mode_info = calloc(1, sizeof(i2s_tdm_config_t));
ESP_GOTO_ON_FALSE(handle->mode_info, ESP_ERR_NO_MEM, err, TAG, "no memory for storing the configurations");
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/* i2s_set_tdm_slot should be called before i2s_set_tdm_clock while initializing, because clock is relay on the slot */
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ESP_GOTO_ON_ERROR(i2s_tdm_set_slot(handle, &tdm_cfg->slot_cfg), err, TAG, "initialize channel failed while setting slot");
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#if SOC_I2S_SUPPORTS_APLL
/* Enable APLL and acquire its lock when the clock source is APLL */
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if (tdm_cfg->clk_cfg.clk_src == I2S_CLK_SRC_APLL) {
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periph_rtc_apll_acquire();
handle->apll_en = true;
}
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#endif
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ESP_GOTO_ON_ERROR(i2s_tdm_set_clock(handle, &tdm_cfg->clk_cfg), err, TAG, "initialize channel failed while setting clock");
/* i2s_tdm_set_gpio should be called after i2s_tdm_set_clock as mclk relies on the clock source */
ESP_GOTO_ON_ERROR(i2s_tdm_set_gpio(handle, &tdm_cfg->gpio_cfg), err, TAG, "initialize channel failed while setting gpio pins");
ESP_GOTO_ON_ERROR(i2s_init_dma_intr(handle, I2S_INTR_ALLOC_FLAGS), err, TAG, "initialize dma interrupt failed");
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#if SOC_I2S_HW_VERSION_2
/* Enable clock to start outputting mclk signal. Some codecs will reset once mclk stop */
if (handle->dir == I2S_DIR_TX) {
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i2s_ll_tx_enable_tdm(handle->controller->hal.dev);
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} else {
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i2s_ll_rx_enable_tdm(handle->controller->hal.dev);
}
#endif
#ifdef CONFIG_PM_ENABLE
esp_pm_lock_type_t pm_type = ESP_PM_APB_FREQ_MAX;
#if SOC_I2S_SUPPORTS_APLL
if (tdm_cfg->clk_cfg.clk_src == I2S_CLK_SRC_APLL) {
pm_type = ESP_PM_NO_LIGHT_SLEEP;
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}
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#endif // SOC_I2S_SUPPORTS_APLL
ESP_RETURN_ON_ERROR(esp_pm_lock_create(pm_type, 0, "i2s_driver", &handle->pm_lock), TAG, "I2S pm lock create failed");
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#endif
/* Initialization finished, mark state as ready */
handle->state = I2S_CHAN_STATE_READY;
xSemaphoreGive(handle->mutex);
ESP_LOGD(TAG, "The %s channel on I2S%d has been initialized to TDM mode successfully",
handle->dir == I2S_DIR_TX ? "tx" : "rx", handle->controller->id);
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return ret;
err:
xSemaphoreGive(handle->mutex);
return ret;
}
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esp_err_t i2s_channel_reconfig_tdm_clock(i2s_chan_handle_t handle, const i2s_tdm_clk_config_t *clk_cfg)
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{
I2S_NULL_POINTER_CHECK(TAG, handle);
I2S_NULL_POINTER_CHECK(TAG, clk_cfg);
esp_err_t ret = ESP_OK;
xSemaphoreTake(handle->mutex, portMAX_DELAY);
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ESP_GOTO_ON_FALSE(handle->mode == I2S_COMM_MODE_TDM, ESP_ERR_INVALID_ARG, err, TAG, "this handle is not working in standard mode");
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ESP_GOTO_ON_FALSE(handle->state == I2S_CHAN_STATE_READY, ESP_ERR_INVALID_STATE, err, TAG, "invalid state, I2S should be disabled before reconfiguring the clock");
i2s_tdm_config_t *tdm_cfg = (i2s_tdm_config_t *)handle->mode_info;
ESP_GOTO_ON_FALSE(tdm_cfg, ESP_ERR_INVALID_STATE, err, TAG, "initialization not complete");
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#if SOC_I2S_SUPPORTS_APLL
/* Enable APLL and acquire its lock when the clock source is changed to APLL */
if (clk_cfg->clk_src == I2S_CLK_SRC_APLL && tdm_cfg->clk_cfg.clk_src != I2S_CLK_SRC_APLL) {
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periph_rtc_apll_acquire();
handle->apll_en = true;
}
/* Disable APLL and release its lock when clock source is changed to 160M_PLL */
if (clk_cfg->clk_src != I2S_CLK_SRC_APLL && tdm_cfg->clk_cfg.clk_src == I2S_CLK_SRC_APLL) {
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periph_rtc_apll_release();
handle->apll_en = false;
}
#endif
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ESP_GOTO_ON_ERROR(i2s_tdm_set_clock(handle, clk_cfg), err, TAG, "update clock failed");
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#ifdef CONFIG_PM_ENABLE
// Create/Re-create power management lock
if (tdm_cfg->clk_cfg.clk_src != clk_cfg->clk_src) {
ESP_GOTO_ON_ERROR(esp_pm_lock_delete(handle->pm_lock), err, TAG, "I2S delete old pm lock failed");
esp_pm_lock_type_t pm_type = ESP_PM_APB_FREQ_MAX;
#if SOC_I2S_SUPPORTS_APLL
if (clk_cfg->clk_src == I2S_CLK_SRC_APLL) {
pm_type = ESP_PM_NO_LIGHT_SLEEP;
}
#endif // SOC_I2S_SUPPORTS_APLL
ESP_GOTO_ON_ERROR(esp_pm_lock_create(pm_type, 0, "i2s_driver", &handle->pm_lock), err, TAG, "I2S pm lock create failed");
}
#endif //CONFIG_PM_ENABLE
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xSemaphoreGive(handle->mutex);
return ESP_OK;
err:
xSemaphoreGive(handle->mutex);
return ret;
}
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esp_err_t i2s_channel_reconfig_tdm_slot(i2s_chan_handle_t handle, const i2s_tdm_slot_config_t *slot_cfg)
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{
I2S_NULL_POINTER_CHECK(TAG, handle);
I2S_NULL_POINTER_CHECK(TAG, slot_cfg);
esp_err_t ret = ESP_OK;
xSemaphoreTake(handle->mutex, portMAX_DELAY);
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ESP_GOTO_ON_FALSE(handle->mode == I2S_COMM_MODE_TDM, ESP_ERR_INVALID_ARG, err, TAG, "this handle is not working in standard mode");
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ESP_GOTO_ON_FALSE(handle->state == I2S_CHAN_STATE_READY, ESP_ERR_INVALID_STATE, err, TAG, "invalid state, I2S should be disabled before reconfiguring the slot");
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i2s_tdm_config_t *tdm_cfg = (i2s_tdm_config_t *)handle->mode_info;
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ESP_GOTO_ON_FALSE(tdm_cfg, ESP_ERR_INVALID_STATE, err, TAG, "initialization not complete");
ESP_GOTO_ON_ERROR(i2s_tdm_set_slot(handle, slot_cfg), err, TAG, "set i2s standard slot failed");
/* If the slot bit width changed, then need to update the clock */
uint32_t slot_bits = slot_cfg->slot_bit_width == I2S_SLOT_BIT_WIDTH_AUTO ? slot_cfg->data_bit_width : slot_cfg->slot_bit_width;
if (tdm_cfg->slot_cfg.slot_bit_width == slot_bits) {
ESP_GOTO_ON_ERROR(i2s_tdm_set_clock(handle, &tdm_cfg->clk_cfg), err, TAG, "update clock failed");
}
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/* Reset queue */
xQueueReset(handle->msg_queue);
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xSemaphoreGive(handle->mutex);
return ESP_OK;
err:
xSemaphoreGive(handle->mutex);
return ret;
}
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esp_err_t i2s_channel_reconfig_tdm_gpio(i2s_chan_handle_t handle, const i2s_tdm_gpio_config_t *gpio_cfg)
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{
I2S_NULL_POINTER_CHECK(TAG, handle);
I2S_NULL_POINTER_CHECK(TAG, gpio_cfg);
esp_err_t ret = ESP_OK;
xSemaphoreTake(handle->mutex, portMAX_DELAY);
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ESP_GOTO_ON_FALSE(handle->mode == I2S_COMM_MODE_TDM, ESP_ERR_INVALID_ARG, err, TAG, "This handle is not working in standard mode");
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ESP_GOTO_ON_FALSE(handle->state == I2S_CHAN_STATE_READY, ESP_ERR_INVALID_STATE, err, TAG, "Invalid state, I2S should be disabled before reconfiguring the gpio");
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ESP_GOTO_ON_ERROR(i2s_tdm_set_gpio(handle, gpio_cfg), err, TAG, "set i2s standard slot failed");
xSemaphoreGive(handle->mutex);
return ESP_OK;
err:
xSemaphoreGive(handle->mutex);
return ret;
}