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zephyr/drivers/i2s/i2s_esp32.c

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/*
* Copyright (c) 2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT espressif_esp32_i2s
#include <zephyr/drivers/dma.h>
#include <zephyr/drivers/i2s.h>
#include <zephyr/drivers/dma/dma_esp32.h>
#include <soc.h>
#include <zephyr/drivers/clock_control.h>
#include <zephyr/drivers/pinctrl.h>
#include <zephyr/logging/log.h>
#include <zephyr/irq.h>
#include <esp_clk_tree.h>
#include <hal/i2s_hal.h>
LOG_MODULE_REGISTER(i2s_esp32, CONFIG_I2S_LOG_LEVEL);
#if !SOC_GDMA_SUPPORTED
#error "Only SoCs with GDMA peripheral are supported!"
#endif
#define I2S_ESP32_CLK_SRC I2S_CLK_SRC_DEFAULT
struct queue_item {
void *buffer;
size_t size;
};
struct i2s_esp32_stream {
int32_t state;
struct i2s_config i2s_cfg;
bool is_slave;
const struct device *dma_dev;
uint32_t dma_channel;
bool stop_without_draining;
void *mem_block;
size_t mem_block_len;
bool last_block;
struct k_msgq queue;
void (*queue_drop)(struct i2s_esp32_stream *stream);
int (*start_transfer)(const struct device *dev);
void (*stop_transfer)(const struct device *dev);
};
struct i2s_esp32_cfg {
const int unit;
i2s_hal_context_t hal_cxt;
const struct pinctrl_dev_config *pcfg;
const struct device *clock_dev;
clock_control_subsys_t clock_subsys;
};
struct i2s_esp32_data {
i2s_hal_clock_info_t clk_info;
struct i2s_esp32_stream rx;
struct i2s_esp32_stream tx;
};
uint32_t i2s_esp32_get_source_clk_freq(i2s_clock_src_t clk_src)
{
uint32_t clk_freq = 0;
esp_clk_tree_src_get_freq_hz(clk_src, ESP_CLK_TREE_SRC_FREQ_PRECISION_CACHED, &clk_freq);
return clk_freq;
}
static esp_err_t i2s_esp32_calculate_clock(const struct i2s_config *i2s_cfg, uint8_t channel_length,
i2s_hal_clock_info_t *i2s_hal_clock_info)
{
uint16_t mclk_multiple = 256;
if (i2s_cfg == NULL) {
LOG_ERR("Input i2s_cfg is NULL");
return ESP_ERR_INVALID_ARG;
}
if (i2s_hal_clock_info == NULL) {
LOG_ERR("Input hal_clock_info is NULL");
return ESP_ERR_INVALID_ARG;
}
if (i2s_cfg->word_size == 24) {
mclk_multiple = 384;
}
if (i2s_cfg->options & I2S_OPT_FRAME_CLK_SLAVE ||
i2s_cfg->options & I2S_OPT_BIT_CLK_SLAVE) {
i2s_hal_clock_info->bclk_div = 8;
i2s_hal_clock_info->bclk =
i2s_cfg->frame_clk_freq * i2s_cfg->channels * channel_length;
i2s_hal_clock_info->mclk = i2s_cfg->frame_clk_freq * i2s_hal_clock_info->bclk_div;
} else {
i2s_hal_clock_info->bclk =
i2s_cfg->frame_clk_freq * i2s_cfg->channels * channel_length;
i2s_hal_clock_info->mclk = i2s_cfg->frame_clk_freq * mclk_multiple;
i2s_hal_clock_info->bclk_div = i2s_hal_clock_info->mclk / i2s_hal_clock_info->bclk;
}
i2s_hal_clock_info->sclk = i2s_esp32_get_source_clk_freq(I2S_ESP32_CLK_SRC);
i2s_hal_clock_info->mclk_div = i2s_hal_clock_info->sclk / i2s_hal_clock_info->mclk;
if (i2s_hal_clock_info->mclk_div == 0) {
LOG_ERR("Sample rate is too large for the current clock source");
return ESP_ERR_INVALID_ARG;
}
return ESP_OK;
}
static void i2s_esp32_queue_drop(struct i2s_esp32_stream *stream)
{
struct queue_item item;
while (k_msgq_get(&stream->queue, &item, K_NO_WAIT) == 0) {
k_mem_slab_free(stream->i2s_cfg.mem_slab, item.buffer);
}
}
static void i2s_esp32_rx_callback(const struct device *dma_dev, void *arg, uint32_t channel,
int status);
static void i2s_esp32_tx_callback(const struct device *dma_dev, void *arg, uint32_t channel,
int status);
static int i2s_esp32_restart_dma(const struct device *dev, enum i2s_dir i2s_dir)
{
const struct i2s_esp32_cfg *dev_cfg = dev->config;
struct i2s_esp32_data *const dev_data = dev->data;
struct i2s_esp32_stream *stream;
void *src = NULL, *dst = NULL;
int err;
if (i2s_dir == I2S_DIR_RX) {
stream = &dev_data->rx;
dst = stream->mem_block;
} else if (i2s_dir == I2S_DIR_TX) {
stream = &dev_data->tx;
src = stream->mem_block;
} else {
LOG_ERR("Invalid DMA direction");
return -EINVAL;
}
err = dma_reload(stream->dma_dev, stream->dma_channel, (uint32_t)src, (uint32_t)dst,
stream->mem_block_len);
if (err < 0) {
LOG_ERR("Error reloading DMA channel[%d]: %d", (int)stream->dma_channel, err);
return -EIO;
}
if (i2s_dir == I2S_DIR_RX) {
i2s_ll_rx_set_eof_num(dev_cfg->hal_cxt.dev, stream->mem_block_len);
}
err = dma_start(stream->dma_dev, stream->dma_channel);
if (err < 0) {
LOG_ERR("Error starting DMA channel[%d]: %d", (int)stream->dma_channel, err);
return -EIO;
}
return 0;
}
static int i2s_esp32_start_dma(const struct device *dev, enum i2s_dir i2s_dir)
{
const struct i2s_esp32_cfg *dev_cfg = dev->config;
struct i2s_esp32_data *const dev_data = dev->data;
struct i2s_esp32_stream *stream = NULL;
struct dma_config dma_cfg = {0};
struct dma_block_config dma_blk = {0};
unsigned int key;
int err, ret = 0;
if (i2s_dir == I2S_DIR_RX) {
stream = &dev_data->rx;
} else if (i2s_dir == I2S_DIR_TX) {
stream = &dev_data->tx;
} else {
LOG_ERR("Invalid DMA direction");
return -EINVAL;
}
key = irq_lock();
dma_blk.block_size = stream->mem_block_len;
if (i2s_dir == I2S_DIR_RX) {
dma_blk.dest_address = (uint32_t)stream->mem_block;
dma_cfg.channel_direction = PERIPHERAL_TO_MEMORY;
dma_cfg.dma_callback = i2s_esp32_rx_callback;
} else {
dma_blk.source_address = (uint32_t)stream->mem_block;
dma_cfg.channel_direction = MEMORY_TO_PERIPHERAL;
dma_cfg.dma_callback = i2s_esp32_tx_callback;
}
dma_cfg.user_data = (void *)dev;
dma_cfg.dma_slot =
dev_cfg->unit == 0 ? ESP_GDMA_TRIG_PERIPH_I2S0 : ESP_GDMA_TRIG_PERIPH_I2S1;
dma_cfg.block_count = 1;
dma_cfg.head_block = &dma_blk;
err = dma_config(stream->dma_dev, stream->dma_channel, &dma_cfg);
if (err < 0) {
LOG_ERR("Error configuring DMA channel[%d]: %d", (int)stream->dma_channel, err);
ret = -EINVAL;
goto unlock;
}
if (i2s_dir == I2S_DIR_RX) {
i2s_ll_rx_set_eof_num(dev_cfg->hal_cxt.dev, stream->mem_block_len);
}
err = dma_start(stream->dma_dev, stream->dma_channel);
if (err < 0) {
LOG_ERR("Error starting DMA channel[%d]: %d", (int)stream->dma_channel, err);
ret = -EIO;
goto unlock;
}
unlock:
irq_unlock(key);
return ret;
}
static int i2s_esp32_rx_start_transfer(const struct device *dev)
{
struct i2s_esp32_data *const dev_data = dev->data;
const struct i2s_esp32_cfg *dev_cfg = dev->config;
struct i2s_esp32_stream *stream = &dev_data->rx;
const i2s_hal_context_t *hal_cxt = &dev_cfg->hal_cxt;
int err;
err = k_mem_slab_alloc(stream->i2s_cfg.mem_slab, &stream->mem_block, K_NO_WAIT);
if (err < 0) {
return -ENOMEM;
}
stream->mem_block_len = stream->i2s_cfg.block_size;
i2s_hal_rx_stop(hal_cxt);
i2s_hal_rx_reset(hal_cxt);
i2s_hal_rx_reset_fifo(hal_cxt);
err = i2s_esp32_start_dma(dev, I2S_DIR_RX);
if (err < 0) {
LOG_ERR("Failed to start RX DMA transfer: %d", err);
return -EIO;
}
i2s_hal_rx_start(hal_cxt);
return 0;
}
static int i2s_esp32_tx_start_transfer(const struct device *dev)
{
const struct i2s_esp32_cfg *dev_cfg = dev->config;
struct i2s_esp32_data *const dev_data = dev->data;
struct i2s_esp32_stream *stream = &dev_data->tx;
const i2s_hal_context_t *hal_cxt = &dev_cfg->hal_cxt;
struct queue_item item;
int err;
err = k_msgq_get(&stream->queue, &item, K_NO_WAIT);
if (err < 0) {
return -ENOMEM;
}
stream->mem_block = item.buffer;
stream->mem_block_len = item.size;
i2s_hal_tx_stop(hal_cxt);
i2s_hal_tx_reset(hal_cxt);
i2s_hal_tx_reset_fifo(hal_cxt);
err = i2s_esp32_start_dma(dev, I2S_DIR_TX);
if (err < 0) {
LOG_ERR("Failed to start TX DMA transfer: %d", err);
return -EIO;
}
i2s_hal_tx_start(hal_cxt);
return 0;
}
static void i2s_esp32_rx_stop_transfer(const struct device *dev)
{
struct i2s_esp32_data *const dev_data = dev->data;
struct i2s_esp32_stream *stream = &dev_data->rx;
dma_stop(stream->dma_dev, stream->dma_channel);
if (stream->mem_block != NULL) {
k_mem_slab_free(stream->i2s_cfg.mem_slab, stream->mem_block);
stream->mem_block = NULL;
stream->mem_block_len = 0;
}
}
static void i2s_esp32_tx_stop_transfer(const struct device *dev)
{
struct i2s_esp32_data *const dev_data = dev->data;
struct i2s_esp32_stream *stream = &dev_data->tx;
dma_stop(stream->dma_dev, stream->dma_channel);
if (stream->mem_block != NULL) {
k_mem_slab_free(stream->i2s_cfg.mem_slab, stream->mem_block);
stream->mem_block = NULL;
stream->mem_block_len = 0;
}
}
static void i2s_esp32_rx_callback(const struct device *dma_dev, void *arg, uint32_t channel,
int status)
{
const struct device *dev = (const struct device *)arg;
struct i2s_esp32_data *const dev_data = dev->data;
struct i2s_esp32_stream *stream = &dev_data->rx;
int err;
if (status < 0) {
stream->state = I2S_STATE_ERROR;
LOG_ERR("RX status bad: %d", status);
goto rx_disable;
}
if (stream->mem_block == NULL) {
if (stream->state != I2S_STATE_READY) {
stream->state = I2S_STATE_ERROR;
LOG_ERR("RX mem_block NULL");
goto rx_disable;
} else {
return;
}
}
struct queue_item item = {.buffer = stream->mem_block, .size = stream->mem_block_len};
err = k_msgq_put(&stream->queue, &item, K_NO_WAIT);
if (err < 0) {
stream->state = I2S_STATE_ERROR;
goto rx_disable;
}
if (stream->state == I2S_STATE_STOPPING) {
stream->state = I2S_STATE_READY;
goto rx_disable;
}
err = k_mem_slab_alloc(stream->i2s_cfg.mem_slab, &stream->mem_block, K_NO_WAIT);
if (err < 0) {
stream->state = I2S_STATE_ERROR;
goto rx_disable;
}
stream->mem_block_len = stream->i2s_cfg.block_size;
err = i2s_esp32_restart_dma(dev, I2S_DIR_RX);
if (err < 0) {
stream->state = I2S_STATE_ERROR;
LOG_ERR("Failed to restart RX transfer: %d", err);
goto rx_disable;
}
return;
rx_disable:
stream->stop_transfer(dev);
}
static void i2s_esp32_tx_callback(const struct device *dma_dev, void *arg, uint32_t channel,
int status)
{
const struct device *dev = (const struct device *)arg;
struct i2s_esp32_data *const dev_data = dev->data;
struct i2s_esp32_stream *stream = &dev_data->tx;
struct queue_item item;
void *mem_block_tmp;
int err;
if (status < 0) {
stream->state = I2S_STATE_ERROR;
LOG_ERR("TX bad status: %d", status);
goto tx_disable;
}
if (stream->mem_block == NULL) {
if (stream->state != I2S_STATE_READY) {
stream->state = I2S_STATE_ERROR;
LOG_ERR("TX mem_block NULL");
goto tx_disable;
} else {
return;
}
}
if (stream->state == I2S_STATE_STOPPING) {
if (k_msgq_num_used_get(&stream->queue) == 0) {
stream->state = I2S_STATE_READY;
goto tx_disable;
} else if (stream->stop_without_draining == true) {
stream->queue_drop(stream);
stream->state = I2S_STATE_READY;
goto tx_disable;
}
/*else: DRAIN trigger, so continue until queue is empty*/
}
if (stream->last_block) {
stream->state = I2S_STATE_READY;
goto tx_disable;
}
err = k_msgq_get(&stream->queue, &item, K_NO_WAIT);
if (err < 0) {
stream->state = I2S_STATE_ERROR;
goto tx_disable;
}
mem_block_tmp = stream->mem_block;
stream->mem_block = item.buffer;
stream->mem_block_len = item.size;
err = i2s_esp32_restart_dma(dev, I2S_DIR_TX);
if (err < 0) {
stream->state = I2S_STATE_ERROR;
LOG_ERR("Failed to restart TX transfer: %d", err);
goto tx_disable;
}
k_mem_slab_free(stream->i2s_cfg.mem_slab, mem_block_tmp);
return;
tx_disable:
stream->stop_transfer(dev);
}
static int i2s_esp32_initialize(const struct device *dev)
{
const struct i2s_esp32_cfg *dev_cfg = dev->config;
struct i2s_esp32_data *const dev_data = dev->data;
const struct device *clk_dev = dev_cfg->clock_dev;
int err;
if (dev_data->tx.dma_dev && !device_is_ready(dev_data->tx.dma_dev)) {
LOG_ERR("%s device not ready", dev_data->tx.dma_dev->name);
return -ENODEV;
}
if (dev_data->rx.dma_dev && !device_is_ready(dev_data->rx.dma_dev)) {
LOG_ERR("%s device not ready", dev_data->rx.dma_dev->name);
return -ENODEV;
}
if (!device_is_ready(clk_dev)) {
LOG_ERR("clock control device not ready");
return -ENODEV;
}
err = clock_control_on(clk_dev, dev_cfg->clock_subsys);
if (err != 0) {
LOG_ERR("Clock control enabling failed: %d", err);
return -EIO;
}
if (dev_data->tx.dma_dev) {
err = k_msgq_alloc_init(&dev_data->tx.queue, sizeof(struct queue_item),
CONFIG_I2S_ESP32_TX_BLOCK_COUNT);
if (err < 0) {
return err;
}
}
if (dev_data->rx.dma_dev) {
err = k_msgq_alloc_init(&dev_data->rx.queue, sizeof(struct queue_item),
CONFIG_I2S_ESP32_RX_BLOCK_COUNT);
if (err < 0) {
return err;
}
}
i2s_ll_enable_clock(dev_cfg->hal_cxt.dev);
LOG_INF("%s initialized", dev->name);
return 0;
}
static int i2s_esp32_configure(const struct device *dev, enum i2s_dir dir,
const struct i2s_config *i2s_cfg)
{
const struct i2s_esp32_cfg *const dev_cfg = dev->config;
struct i2s_esp32_data *const dev_data = dev->data;
struct i2s_esp32_stream *stream;
uint8_t data_format;
switch (dir) {
case I2S_DIR_RX:
stream = &dev_data->rx;
if (stream->dma_dev == NULL) {
LOG_ERR("RX DMA controller not available");
return -EINVAL;
}
break;
case I2S_DIR_TX:
stream = &dev_data->tx;
if (stream->dma_dev == NULL) {
LOG_ERR("TX DMA controller not available");
return -EINVAL;
}
break;
case I2S_DIR_BOTH:
LOG_ERR("I2S_DIR_BOTH is not supported");
return -ENOSYS;
default:
LOG_ERR("Invalid direction");
return -EINVAL;
}
if (stream->state != I2S_STATE_NOT_READY && stream->state != I2S_STATE_READY) {
LOG_ERR("Invalid state: %d", (int)stream->state);
return -EINVAL;
}
if (i2s_cfg->frame_clk_freq == 0U) {
stream->queue_drop(stream);
memset(&stream->i2s_cfg, 0, sizeof(struct i2s_config));
stream->is_slave = false;
stream->state = I2S_STATE_NOT_READY;
return 0;
}
data_format = i2s_cfg->format & I2S_FMT_DATA_FORMAT_MASK;
if (data_format != I2S_FMT_DATA_FORMAT_I2S &&
data_format != I2S_FMT_DATA_FORMAT_LEFT_JUSTIFIED &&
data_format != I2S_FMT_DATA_FORMAT_RIGHT_JUSTIFIED) {
LOG_ERR("Invalid data format: %u", (unsigned int)data_format);
return -EINVAL;
}
if (i2s_cfg->word_size != 8 && i2s_cfg->word_size != 16 && i2s_cfg->word_size != 24 &&
i2s_cfg->word_size != 32) {
LOG_ERR("Word size not supported: %d", (int)i2s_cfg->word_size);
return -EINVAL;
}
if (i2s_cfg->channels != 2) {
LOG_ERR("Currently only 2 channels are supported");
return -EINVAL;
}
if (i2s_cfg->options & I2S_OPT_LOOPBACK) {
LOG_ERR("For internal loopback: I2S#_O_SD_GPIO = I2S#_I_SD_GPIO");
return -EINVAL;
}
if (i2s_cfg->options & I2S_OPT_PINGPONG) {
LOG_ERR("Unsupported option: I2S_OPT_PINGPONG");
return -EINVAL;
}
if ((i2s_cfg->options & I2S_OPT_FRAME_CLK_SLAVE) != 0 &&
(i2s_cfg->options & I2S_OPT_BIT_CLK_SLAVE) != 0) {
stream->is_slave = true;
} else if ((i2s_cfg->options & I2S_OPT_FRAME_CLK_SLAVE) == 0 &&
(i2s_cfg->options & I2S_OPT_BIT_CLK_SLAVE) == 0) {
stream->is_slave = false;
} else {
LOG_ERR("I2S_OPT_FRAME_CLK and I2S_OPT_BIT_CLK options must both be"
" MASTER or SLAVE");
return -EINVAL;
}
i2s_hal_slot_config_t slot_cfg = {0};
slot_cfg.data_bit_width = i2s_cfg->word_size;
slot_cfg.slot_mode = I2S_SLOT_MODE_STEREO;
slot_cfg.slot_bit_width = i2s_cfg->word_size > 16 ? 32 : 16;
if (data_format == I2S_FMT_DATA_FORMAT_I2S) {
slot_cfg.std.ws_pol = i2s_cfg->format & I2S_FMT_FRAME_CLK_INV ? true : false;
slot_cfg.std.bit_shift = true;
slot_cfg.std.left_align = true;
} else {
slot_cfg.std.ws_pol = i2s_cfg->format & I2S_FMT_FRAME_CLK_INV ? false : true;
slot_cfg.std.bit_shift = false;
if (data_format == I2S_FMT_DATA_FORMAT_LEFT_JUSTIFIED) {
slot_cfg.std.left_align = true;
} else if (data_format == I2S_FMT_DATA_FORMAT_RIGHT_JUSTIFIED) {
slot_cfg.std.left_align = false;
} else {
LOG_ERR("Invalid data format: %u", (unsigned int)data_format);
}
}
slot_cfg.std.ws_width = slot_cfg.slot_bit_width;
slot_cfg.std.slot_mask = I2S_STD_SLOT_BOTH;
slot_cfg.std.big_endian = false;
slot_cfg.std.bit_order_lsb = i2s_cfg->format & I2S_FMT_DATA_ORDER_LSB ? true : false;
int err;
i2s_hal_clock_info_t i2s_hal_clock_info;
i2s_hal_context_t *hal_cxt = (i2s_hal_context_t *)&dev_cfg->hal_cxt;
err = i2s_esp32_calculate_clock(i2s_cfg, slot_cfg.slot_bit_width, &i2s_hal_clock_info);
if (err != ESP_OK) {
return -EINVAL;
}
if (dir == I2S_DIR_TX) {
if (dev_data->rx.state != I2S_STATE_NOT_READY) {
if (stream->is_slave && !dev_data->rx.is_slave) { /*full duplex*/
i2s_ll_share_bck_ws(hal_cxt->dev, true);
} else {
i2s_ll_share_bck_ws(hal_cxt->dev, false);
}
} else {
i2s_ll_share_bck_ws(hal_cxt->dev, false);
}
i2s_hal_std_set_tx_slot(hal_cxt, stream->is_slave, &slot_cfg);
i2s_hal_set_tx_clock(hal_cxt, &i2s_hal_clock_info, I2S_ESP32_CLK_SRC);
err = pinctrl_apply_state(dev_cfg->pcfg, PINCTRL_STATE_DEFAULT);
if (err < 0) {
LOG_ERR("Pins setup failed: %d", err);
return -EIO;
}
if (dev_data->tx.state != I2S_STATE_NOT_READY) {
if (stream->is_slave && dev_data->rx.is_slave) {
i2s_ll_mclk_bind_to_tx_clk(hal_cxt->dev);
}
}
i2s_hal_std_enable_tx_channel(hal_cxt);
} else if (dir == I2S_DIR_RX) {
if (dev_data->tx.state != I2S_STATE_NOT_READY) {
if (stream->is_slave && !dev_data->tx.is_slave) { /*full duplex*/
i2s_ll_share_bck_ws(hal_cxt->dev, true);
} else {
i2s_ll_share_bck_ws(hal_cxt->dev, false);
}
} else {
i2s_ll_share_bck_ws(hal_cxt->dev, false);
}
i2s_hal_std_set_rx_slot(hal_cxt, stream->is_slave, &slot_cfg);
i2s_hal_set_rx_clock(hal_cxt, &i2s_hal_clock_info, I2S_ESP32_CLK_SRC);
err = pinctrl_apply_state(dev_cfg->pcfg, PINCTRL_STATE_DEFAULT);
if (err < 0) {
LOG_ERR("Pins setup failed: %d", err);
return -EIO;
}
if (dev_data->tx.state != I2S_STATE_NOT_READY) {
if (!stream->is_slave && !dev_data->tx.is_slave) {
i2s_ll_mclk_bind_to_rx_clk(hal_cxt->dev);
}
}
i2s_hal_std_enable_rx_channel(hal_cxt);
}
memcpy(&stream->i2s_cfg, i2s_cfg, sizeof(struct i2s_config));
stream->state = I2S_STATE_READY;
return 0;
}
static const struct i2s_config *i2s_esp32_config_get(const struct device *dev, enum i2s_dir dir)
{
struct i2s_esp32_data *dev_data = dev->data;
struct i2s_esp32_stream *stream;
if (dir == I2S_DIR_RX) {
stream = &dev_data->rx;
} else {
stream = &dev_data->tx;
}
if (stream->state == I2S_STATE_NOT_READY) {
return NULL;
}
return &stream->i2s_cfg;
}
static int i2s_esp32_trigger(const struct device *dev, enum i2s_dir dir, enum i2s_trigger_cmd cmd)
{
struct i2s_esp32_data *const dev_data = dev->data;
struct i2s_esp32_stream *stream;
struct dma_status dma_channel_status;
unsigned int key;
int err;
switch (dir) {
case I2S_DIR_RX:
stream = &dev_data->rx;
break;
case I2S_DIR_TX:
stream = &dev_data->tx;
break;
case I2S_DIR_BOTH:
LOG_ERR("Unsupported direction: %d", (int)dir);
return -ENOSYS;
default:
LOG_ERR("Invalid direction: %d", (int)dir);
return -EINVAL;
}
switch (cmd) {
case I2S_TRIGGER_START:
if (stream->state != I2S_STATE_READY) {
LOG_ERR("START - Invalid state: %d", (int)stream->state);
return -EIO;
}
err = stream->start_transfer(dev);
if (err < 0) {
LOG_ERR("START - Transfer start failed: %d", err);
return -EIO;
}
stream->last_block = false;
stream->state = I2S_STATE_RUNNING;
break;
case I2S_TRIGGER_STOP:
key = irq_lock();
if (stream->state != I2S_STATE_RUNNING) {
irq_unlock(key);
LOG_ERR("STOP - Invalid state: %d", (int)stream->state);
return -EIO;
}
err = dma_get_status(stream->dma_dev, stream->dma_channel, &dma_channel_status);
if (err < 0) {
irq_unlock(key);
LOG_ERR("Unable to get DMA channel[%d] status: %d",
(int)stream->dma_channel, err);
return -EIO;
}
if (dma_channel_status.busy) {
stream->stop_without_draining = true;
stream->state = I2S_STATE_STOPPING;
} else {
stream->stop_transfer(dev);
stream->last_block = true;
stream->state = I2S_STATE_READY;
}
irq_unlock(key);
break;
case I2S_TRIGGER_DRAIN:
key = irq_lock();
if (stream->state != I2S_STATE_RUNNING) {
irq_unlock(key);
LOG_ERR("DRAIN - Invalid state: %d", (int)stream->state);
return -EIO;
}
err = dma_get_status(stream->dma_dev, stream->dma_channel, &dma_channel_status);
if (err < 0) {
irq_unlock(key);
LOG_ERR("Unable to get DMA channel[%d] status: %d",
(int)stream->dma_channel, err);
return -EIO;
}
if (dir == I2S_DIR_TX) {
if (k_msgq_num_used_get(&stream->queue) > 0 || dma_channel_status.busy) {
stream->stop_without_draining = false;
stream->state = I2S_STATE_STOPPING;
} else {
stream->stop_transfer(dev);
stream->state = I2S_STATE_READY;
}
} else if (dir == I2S_DIR_RX) {
if (dma_channel_status.busy) {
stream->stop_without_draining = true;
stream->state = I2S_STATE_STOPPING;
} else {
stream->stop_transfer(dev);
stream->last_block = true;
stream->state = I2S_STATE_READY;
}
} else {
irq_unlock(key);
LOG_ERR("Invalid direction: %d", (int)dir);
return -EINVAL;
}
irq_unlock(key);
break;
case I2S_TRIGGER_DROP:
if (stream->state == I2S_STATE_NOT_READY) {
LOG_ERR("DROP - invalid state: %d", (int)stream->state);
return -EIO;
}
stream->stop_transfer(dev);
stream->queue_drop(stream);
stream->state = I2S_STATE_READY;
break;
case I2S_TRIGGER_PREPARE:
if (stream->state != I2S_STATE_ERROR) {
LOG_ERR("PREPARE - invalid state: %d", (int)stream->state);
return -EIO;
}
stream->queue_drop(stream);
stream->state = I2S_STATE_READY;
break;
default:
LOG_ERR("Unsupported trigger command: %d", (int)cmd);
return -EINVAL;
}
return 0;
}
static int i2s_esp32_read(const struct device *dev, void **mem_block, size_t *size)
{
struct i2s_esp32_data *const dev_data = dev->data;
struct queue_item item;
int err;
if (dev_data->rx.state == I2S_STATE_NOT_READY) {
LOG_ERR("RX invalid state: %d", (int)dev_data->rx.state);
return -EIO;
} else if (dev_data->rx.state == I2S_STATE_ERROR &&
k_msgq_num_used_get(&dev_data->rx.queue) == 0) {
LOG_ERR("RX queue empty");
return -EIO;
}
err = k_msgq_get(&dev_data->rx.queue, &item, K_MSEC(dev_data->rx.i2s_cfg.timeout));
if (err < 0) {
LOG_ERR("RX queue empty");
return err;
}
*mem_block = item.buffer;
*size = item.size;
return 0;
}
static int i2s_esp32_write(const struct device *dev, void *mem_block, size_t size)
{
struct i2s_esp32_data *const dev_data = dev->data;
int err;
if (dev_data->tx.state != I2S_STATE_RUNNING && dev_data->tx.state != I2S_STATE_READY) {
LOG_ERR("TX Invalid state: %d", (int)dev_data->tx.state);
return -EIO;
}
if (size > dev_data->tx.i2s_cfg.block_size) {
LOG_ERR("Max write size is: %u", (unsigned int)dev_data->tx.i2s_cfg.block_size);
return -EINVAL;
}
struct queue_item item = {.buffer = mem_block, .size = size};
err = k_msgq_put(&dev_data->tx.queue, &item, K_MSEC(dev_data->tx.i2s_cfg.timeout));
if (err < 0) {
LOG_ERR("TX queue full");
return err;
}
return 0;
}
static const struct i2s_driver_api i2s_esp32_driver_api = {
.configure = i2s_esp32_configure,
.config_get = i2s_esp32_config_get,
.trigger = i2s_esp32_trigger,
.read = i2s_esp32_read,
.write = i2s_esp32_write,
};
#define I2S_ESP32_DMA_CHANNEL_INIT(index, dir) \
.dir = {.state = I2S_STATE_NOT_READY, \
.is_slave = false, \
.dma_dev = UTIL_AND(DT_INST_DMAS_HAS_NAME(index, dir), \
DEVICE_DT_GET(DT_INST_DMAS_CTLR_BY_NAME(index, dir))), \
.dma_channel = UTIL_AND(DT_INST_DMAS_HAS_NAME(index, dir), \
DT_INST_DMAS_CELL_BY_NAME(index, dir, channel)), \
.mem_block = NULL, \
.mem_block_len = 0, \
.start_transfer = i2s_esp32_##dir##_start_transfer, \
.stop_transfer = i2s_esp32_##dir##_stop_transfer, \
.queue_drop = i2s_esp32_queue_drop, \
.last_block = false, \
.stop_without_draining = false}
#define I2S_ESP32_INIT(index) \
PINCTRL_DT_INST_DEFINE(index); \
\
static const struct i2s_esp32_cfg i2s_esp32_config_##index = { \
.unit = DT_PROP(DT_DRV_INST(index), unit), \
.hal_cxt = {.dev = (i2s_dev_t *)DT_INST_REG_ADDR(index)}, \
.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(index), \
.clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(index)), \
.clock_subsys = (clock_control_subsys_t)DT_INST_CLOCKS_CELL(index, offset)}; \
\
static struct i2s_esp32_data i2s_esp32_data_##index = { \
I2S_ESP32_DMA_CHANNEL_INIT(index, rx), I2S_ESP32_DMA_CHANNEL_INIT(index, tx)}; \
\
DEVICE_DT_INST_DEFINE(index, &i2s_esp32_initialize, NULL, &i2s_esp32_data_##index, \
&i2s_esp32_config_##index, POST_KERNEL, CONFIG_I2S_INIT_PRIORITY, \
&i2s_esp32_driver_api);
DT_INST_FOREACH_STATUS_OKAY(I2S_ESP32_INIT)
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