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ESP_I2S.cpp
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// Disable the automatic pin remapping of the API calls in this file
#define ARDUINO_CORE_BUILD
#include "ESP_I2S.h"
#if SOC_I2S_SUPPORTED
#include "esp32-hal-periman.h"
#include "wav_header.h"
#include "mp3dec.h"
#define I2S_READ_CHUNK_SIZE 1920
#define I2S_DEFAULT_CFG() \
{ \
.id = I2S_NUM_AUTO, .role = I2S_ROLE_MASTER, .dma_desc_num = 6, .dma_frame_num = 240, .auto_clear = true, .auto_clear_before_cb = false, \
.intr_priority = 0 \
}
#define I2S_STD_CHAN_CFG(_sample_rate, _data_bit_width, _slot_mode) \
{ \
.clk_cfg = I2S_STD_CLK_DEFAULT_CONFIG(_sample_rate), .slot_cfg = I2S_STD_PHILIP_SLOT_DEFAULT_CONFIG(_data_bit_width, _slot_mode), \
.gpio_cfg = { \
.mclk = (gpio_num_t)_mclk, \
.bclk = (gpio_num_t)_bclk, \
.ws = (gpio_num_t)_ws, \
.dout = (gpio_num_t)_dout, \
.din = (gpio_num_t)_din, \
.invert_flags = \
{ \
.mclk_inv = _mclk_inv, \
.bclk_inv = _bclk_inv, \
.ws_inv = _ws_inv, \
}, \
}, \
}
#if SOC_I2S_SUPPORTS_TDM
#define I2S_TDM_CHAN_CFG(_sample_rate, _data_bit_width, _slot_mode, _mask) \
{ \
.clk_cfg = I2S_TDM_CLK_DEFAULT_CONFIG(_sample_rate), .slot_cfg = I2S_TDM_PHILIP_SLOT_DEFAULT_CONFIG(_data_bit_width, _slot_mode, _mask), \
.gpio_cfg = { \
.mclk = (gpio_num_t)_mclk, \
.bclk = (gpio_num_t)_bclk, \
.ws = (gpio_num_t)_ws, \
.dout = (gpio_num_t)_dout, \
.din = (gpio_num_t)_din, \
.invert_flags = \
{ \
.mclk_inv = _mclk_inv, \
.bclk_inv = _bclk_inv, \
.ws_inv = _ws_inv, \
}, \
}, \
}
#endif
#if SOC_I2S_SUPPORTS_PDM_TX
#if (SOC_I2S_PDM_MAX_TX_LINES > 1)
#define I2S_PDM_TX_CHAN_CFG(_sample_rate, _data_bit_width, _slot_mode) \
{ \
.clk_cfg = I2S_PDM_TX_CLK_DEFAULT_CONFIG(_sample_rate), .slot_cfg = I2S_PDM_TX_SLOT_DEFAULT_CONFIG(_data_bit_width, _slot_mode), \
.gpio_cfg = { \
.clk = (gpio_num_t)_tx_clk, \
.dout = (gpio_num_t)_tx_dout0, \
.dout2 = (gpio_num_t)_tx_dout1, \
.invert_flags = \
{ \
.clk_inv = _tx_clk_inv, \
}, \
}, \
}
#else
#define I2S_PDM_TX_CHAN_CFG(_sample_rate, _data_bit_width, _slot_mode) \
{ \
.clk_cfg = I2S_PDM_TX_CLK_DEFAULT_CONFIG(_sample_rate), .slot_cfg = I2S_PDM_TX_SLOT_DEFAULT_CONFIG(_data_bit_width, _slot_mode), \
.gpio_cfg = { \
.clk = (gpio_num_t)_tx_clk, \
.dout = (gpio_num_t)_tx_dout0, \
.invert_flags = \
{ \
.clk_inv = _tx_clk_inv, \
}, \
}, \
}
#endif
#endif
#if SOC_I2S_SUPPORTS_PDM_RX
#if (SOC_I2S_PDM_MAX_RX_LINES > 1)
#define I2S_PDM_RX_CHAN_CFG(_sample_rate, _data_bit_width, _slot_mode) \
{ \
.clk_cfg = I2S_PDM_RX_CLK_DEFAULT_CONFIG(_sample_rate), .slot_cfg = I2S_PDM_RX_SLOT_DEFAULT_CONFIG(_data_bit_width, _slot_mode), \
.gpio_cfg = { \
.clk = (gpio_num_t)_rx_clk, \
.dins = \
{ \
(gpio_num_t)_rx_din0, \
(gpio_num_t)_rx_din1, \
(gpio_num_t)_rx_din2, \
(gpio_num_t)_rx_din3, \
}, \
.invert_flags = \
{ \
.clk_inv = _rx_clk_inv, \
}, \
}, \
}
#else
#define I2S_PDM_RX_CHAN_CFG(_sample_rate, _data_bit_width, _slot_mode) \
{ \
.clk_cfg = I2S_PDM_RX_CLK_DEFAULT_CONFIG(_sample_rate), .slot_cfg = I2S_PDM_RX_SLOT_DEFAULT_CONFIG(_data_bit_width, _slot_mode), \
.gpio_cfg = { \
.clk = (gpio_num_t)_rx_clk, \
.din = (gpio_num_t)_rx_din0, \
.invert_flags = \
{ \
.clk_inv = _rx_clk_inv, \
}, \
}, \
}
#endif
#endif
#define I2S_ERROR_CHECK_RETURN(x, r) \
do { \
last_error = (x); \
if (unlikely(last_error != ESP_OK)) { \
log_e("ERROR: %s", esp_err_to_name(last_error)); \
return (r); \
} \
} while (0)
#define I2S_ERROR_CHECK_RETURN_FALSE(x) I2S_ERROR_CHECK_RETURN(x, false)
// Default read, no resmpling and temp buffer necessary
static esp_err_t i2s_channel_read_default(i2s_chan_handle_t handle, char *tmp_buf, void *dst, size_t len, size_t *bytes_read, uint32_t timeout_ms) {
return i2s_channel_read(handle, (char *)dst, len, bytes_read, timeout_ms);
}
// Resample the 32bit SPH0645 microphone data into 16bit. SPH0645 is actually 18 bit, but this trick helps save some space
static esp_err_t i2s_channel_read_32_to_16(i2s_chan_handle_t handle, char *read_buff, void *dst, size_t len, size_t *bytes_read, uint32_t timeout_ms) {
size_t out_len = 0;
size_t read_buff_len = len * 2;
if (read_buff == NULL) {
log_e("Temp buffer is NULL!");
return ESP_FAIL;
}
esp_err_t err = i2s_channel_read(handle, read_buff, read_buff_len, &out_len, timeout_ms);
if (err != ESP_OK) {
*bytes_read = 0;
return err;
}
out_len /= 4;
uint16_t *ds = (uint16_t *)dst;
uint32_t *src = (uint32_t *)read_buff;
for (size_t i = 0; i < out_len; i++) {
ds[i] = src[i] >> 16;
}
*bytes_read = out_len * 2;
return ESP_OK;
}
// Resample the 16bit stereo microphone data into 16bit mono.
static esp_err_t i2s_channel_read_16_stereo_to_mono(i2s_chan_handle_t handle, char *read_buff, void *dst, size_t len, size_t *bytes_read, uint32_t timeout_ms) {
size_t out_len = 0;
size_t read_buff_len = len * 2;
if (read_buff == NULL) {
log_e("Temp buffer is NULL!");
return ESP_FAIL;
}
esp_err_t err = i2s_channel_read(handle, read_buff, read_buff_len, &out_len, timeout_ms);
if (err != ESP_OK) {
*bytes_read = 0;
return err;
}
out_len /= 2;
uint16_t *ds = (uint16_t *)dst;
uint16_t *src = (uint16_t *)read_buff;
for (size_t i = 0; i < out_len; i += 2) {
*ds++ = src[i];
}
*bytes_read = out_len;
return ESP_OK;
}
I2SClass::I2SClass() {
last_error = ESP_OK;
tx_chan = NULL;
tx_sample_rate = 0;
tx_data_bit_width = I2S_DATA_BIT_WIDTH_16BIT;
tx_slot_mode = I2S_SLOT_MODE_STEREO;
rx_fn = i2s_channel_read_default;
rx_transform = I2S_RX_TRANSFORM_NONE;
rx_transform_buf = NULL;
rx_transform_buf_len = 0;
rx_chan = NULL;
rx_sample_rate = 0;
rx_data_bit_width = I2S_DATA_BIT_WIDTH_16BIT;
rx_slot_mode = I2S_SLOT_MODE_STEREO;
_mclk = -1;
_bclk = -1;
_ws = -1;
_dout = -1;
_din = -1;
_mclk_inv = false;
_bclk_inv = false;
_ws_inv = false;
#if SOC_I2S_SUPPORTS_PDM_TX
_tx_clk = -1;
_tx_dout0 = -1;
_tx_dout1 = -1;
_tx_clk_inv = false;
#endif
#if SOC_I2S_SUPPORTS_PDM_RX
_rx_clk = -1;
_rx_din0 = -1;
_rx_din1 = -1;
_rx_din2 = -1;
_rx_din3 = -1;
_rx_clk_inv = false;
#endif
}
I2SClass::~I2SClass() {
end();
}
bool I2SClass::i2sDetachBus(void *bus_pointer) {
I2SClass *bus = (I2SClass *)bus_pointer;
if (bus->tx_chan != NULL || bus->tx_chan != NULL) {
bus->end();
}
return true;
}
// Set pins for STD and TDM mode
void I2SClass::setPins(int8_t bclk, int8_t ws, int8_t dout, int8_t din, int8_t mclk) {
_mclk = digitalPinToGPIONumber(mclk);
_bclk = digitalPinToGPIONumber(bclk);
_ws = digitalPinToGPIONumber(ws);
_dout = digitalPinToGPIONumber(dout);
_din = digitalPinToGPIONumber(din);
}
void I2SClass::setInverted(bool bclk, bool ws, bool mclk) {
_mclk_inv = mclk;
_bclk_inv = bclk;
_ws_inv = ws;
}
// Set pins for PDM TX mode
#if SOC_I2S_SUPPORTS_PDM_TX
void I2SClass::setPinsPdmTx(int8_t clk, int8_t dout0, int8_t dout1) {
_tx_clk = digitalPinToGPIONumber(clk);
_tx_dout0 = digitalPinToGPIONumber(dout0);
#if (SOC_I2S_PDM_MAX_TX_LINES > 1)
_tx_dout1 = digitalPinToGPIONumber(dout1);
#endif
}
#endif
// Set pins for PDM RX mode
#if SOC_I2S_SUPPORTS_PDM_RX
void I2SClass::setPinsPdmRx(int8_t clk, int8_t din0, int8_t din1, int8_t din2, int8_t din3) {
_rx_clk = digitalPinToGPIONumber(clk);
_rx_din0 = digitalPinToGPIONumber(din0);
#if (SOC_I2S_PDM_MAX_RX_LINES > 1)
_rx_din1 = digitalPinToGPIONumber(din1);
_rx_din2 = digitalPinToGPIONumber(din2);
_rx_din3 = digitalPinToGPIONumber(din3);
#endif
}
#endif
#if SOC_I2S_SUPPORTS_PDM_TX || SOC_I2S_SUPPORTS_PDM_RX
void I2SClass::setInvertedPdm(bool clk) {
#if SOC_I2S_SUPPORTS_PDM_TX
_tx_clk_inv = clk;
#endif
#if SOC_I2S_SUPPORTS_PDM_RX
_rx_clk_inv = clk;
#endif
}
#endif
bool I2SClass::initSTD(uint32_t rate, i2s_data_bit_width_t bits_cfg, i2s_slot_mode_t ch, int8_t slot_mask) {
// Peripheral manager deinit previous peripheral if pin was used
if (_mclk >= 0) {
if (!perimanClearPinBus(_mclk)) {
return false;
}
}
if (_bclk >= 0) {
if (!perimanClearPinBus(_bclk)) {
return false;
}
}
if (_ws >= 0) {
if (!perimanClearPinBus(_ws)) {
return false;
}
}
if (_dout >= 0) {
if (!perimanClearPinBus(_dout)) {
return false;
}
}
if (_din >= 0) {
if (!perimanClearPinBus(_din)) {
return false;
}
}
// Set peripheral manager detach function for I2S
if (_mclk >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_STD_MCLK, I2SClass::i2sDetachBus);
}
if (_bclk >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_STD_BCLK, I2SClass::i2sDetachBus);
}
if (_ws >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_STD_WS, I2SClass::i2sDetachBus);
}
if (_dout >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_STD_DOUT, I2SClass::i2sDetachBus);
}
if (_din >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_STD_DIN, I2SClass::i2sDetachBus);
}
// I2S configuration
i2s_chan_config_t chan_cfg = I2S_DEFAULT_CFG();
if (_dout >= 0 && _din >= 0) {
I2S_ERROR_CHECK_RETURN_FALSE(i2s_new_channel(&chan_cfg, &tx_chan, &rx_chan));
} else if (_dout >= 0) {
I2S_ERROR_CHECK_RETURN_FALSE(i2s_new_channel(&chan_cfg, &tx_chan, NULL));
} else if (_din >= 0) {
I2S_ERROR_CHECK_RETURN_FALSE(i2s_new_channel(&chan_cfg, NULL, &rx_chan));
}
i2s_std_config_t i2s_config = I2S_STD_CHAN_CFG(rate, bits_cfg, ch);
if (slot_mask >= 0 && (i2s_std_slot_mask_t)slot_mask <= I2S_STD_SLOT_BOTH) {
i2s_config.slot_cfg.slot_mask = (i2s_std_slot_mask_t)slot_mask;
}
if (tx_chan != NULL) {
tx_sample_rate = rate;
tx_data_bit_width = bits_cfg;
tx_slot_mode = ch;
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_init_std_mode(tx_chan, &i2s_config));
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_enable(tx_chan));
}
if (rx_chan != NULL) {
rx_sample_rate = rate;
rx_data_bit_width = bits_cfg;
rx_slot_mode = ch;
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_init_std_mode(rx_chan, &i2s_config));
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_enable(rx_chan));
}
// Peripheral manager set bus type to I2S
if (_mclk >= 0) {
if (!perimanSetPinBus(_mclk, ESP32_BUS_TYPE_I2S_STD_MCLK, (void *)(this), -1, -1)) {
goto err;
}
}
if (_bclk >= 0) {
if (!perimanSetPinBus(_bclk, ESP32_BUS_TYPE_I2S_STD_BCLK, (void *)(this), -1, -1)) {
goto err;
}
}
if (_ws >= 0) {
if (!perimanSetPinBus(_ws, ESP32_BUS_TYPE_I2S_STD_WS, (void *)(this), -1, -1)) {
goto err;
}
}
if (_dout >= 0) {
if (!perimanSetPinBus(_dout, ESP32_BUS_TYPE_I2S_STD_DOUT, (void *)(this), -1, -1)) {
goto err;
}
}
if (_din >= 0) {
if (!perimanSetPinBus(_din, ESP32_BUS_TYPE_I2S_STD_DIN, (void *)(this), -1, -1)) {
goto err;
}
}
return true;
err:
log_e("Failed to set all pins bus to I2S_STD");
I2SClass::i2sDetachBus((void *)(this));
return false;
}
#if SOC_I2S_SUPPORTS_TDM
bool I2SClass::initTDM(uint32_t rate, i2s_data_bit_width_t bits_cfg, i2s_slot_mode_t ch, int8_t slot_mask) {
// Peripheral manager deinit previous peripheral if pin was used
if (_mclk >= 0) {
if (!perimanClearPinBus(_mclk)) {
return false;
}
}
if (_bclk >= 0) {
if (!perimanClearPinBus(_bclk)) {
return false;
}
}
if (_ws >= 0) {
if (!perimanClearPinBus(_ws)) {
return false;
}
}
if (_dout >= 0) {
if (!perimanClearPinBus(_dout)) {
return false;
}
}
if (_din >= 0) {
if (!perimanClearPinBus(_din)) {
return false;
}
}
// Set peripheral manager detach function for I2S
if (_mclk >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_TDM_MCLK, I2SClass::i2sDetachBus);
}
if (_bclk >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_TDM_BCLK, I2SClass::i2sDetachBus);
}
if (_ws >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_TDM_WS, I2SClass::i2sDetachBus);
}
if (_dout >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_TDM_DOUT, I2SClass::i2sDetachBus);
}
if (_din >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_TDM_DIN, I2SClass::i2sDetachBus);
}
// I2S configuration
i2s_chan_config_t chan_cfg = I2S_DEFAULT_CFG();
if (_dout >= 0 && _din >= 0) {
I2S_ERROR_CHECK_RETURN_FALSE(i2s_new_channel(&chan_cfg, &tx_chan, &rx_chan));
} else if (_dout >= 0) {
I2S_ERROR_CHECK_RETURN_FALSE(i2s_new_channel(&chan_cfg, &tx_chan, NULL));
} else if (_din >= 0) {
I2S_ERROR_CHECK_RETURN_FALSE(i2s_new_channel(&chan_cfg, NULL, &rx_chan));
}
i2s_tdm_config_t i2s_tdm_config = I2S_TDM_CHAN_CFG(rate, bits_cfg, ch, (i2s_tdm_slot_mask_t)slot_mask);
if (tx_chan != NULL) {
tx_sample_rate = rate;
tx_data_bit_width = bits_cfg;
tx_slot_mode = ch;
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_init_tdm_mode(tx_chan, &i2s_tdm_config));
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_enable(tx_chan));
}
if (rx_chan != NULL) {
rx_sample_rate = rate;
rx_data_bit_width = bits_cfg;
rx_slot_mode = ch;
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_init_tdm_mode(rx_chan, &i2s_tdm_config));
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_enable(rx_chan));
}
// Peripheral manager set bus type to I2S
if (_mclk >= 0) {
if (!perimanSetPinBus(_mclk, ESP32_BUS_TYPE_I2S_TDM_MCLK, (void *)(this), -1, -1)) {
goto err;
}
}
if (_bclk >= 0) {
if (!perimanSetPinBus(_bclk, ESP32_BUS_TYPE_I2S_TDM_BCLK, (void *)(this), -1, -1)) {
goto err;
}
}
if (_ws >= 0) {
if (!perimanSetPinBus(_ws, ESP32_BUS_TYPE_I2S_TDM_WS, (void *)(this), -1, -1)) {
goto err;
}
}
if (_dout >= 0) {
if (!perimanSetPinBus(_dout, ESP32_BUS_TYPE_I2S_TDM_DOUT, (void *)(this), -1, -1)) {
goto err;
}
}
if (_din >= 0) {
if (!perimanSetPinBus(_din, ESP32_BUS_TYPE_I2S_TDM_DIN, (void *)(this), -1, -1)) {
goto err;
}
}
return true;
err:
log_e("Failed to set all pins bus to I2S_TDM");
I2SClass::i2sDetachBus((void *)(this));
return false;
}
#endif
#if SOC_I2S_SUPPORTS_PDM_TX
bool I2SClass::initPDMtx(uint32_t rate, i2s_data_bit_width_t bits_cfg, i2s_slot_mode_t ch) {
// Peripheral manager deinit previous peripheral if pin was used
if (_tx_clk >= 0) {
if (!perimanClearPinBus(_tx_clk)) {
return false;
}
}
if (_tx_dout0 >= 0) {
if (!perimanClearPinBus(_tx_dout0)) {
return false;
}
}
if (_tx_dout1 >= 0) {
if (!perimanClearPinBus(_tx_dout1)) {
return false;
}
}
// Set peripheral manager detach function for I2S
if (_tx_clk >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_PDM_TX_CLK, I2SClass::i2sDetachBus);
}
if (_tx_dout0 >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_PDM_TX_DOUT0, I2SClass::i2sDetachBus);
}
if (_tx_dout1 >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_PDM_TX_DOUT1, I2SClass::i2sDetachBus);
}
// I2S configuration
i2s_chan_config_t chan_cfg = I2S_DEFAULT_CFG();
I2S_ERROR_CHECK_RETURN_FALSE(i2s_new_channel(&chan_cfg, &tx_chan, NULL));
i2s_pdm_tx_config_t i2s_pdm_tx_config = I2S_PDM_TX_CHAN_CFG(rate, bits_cfg, ch);
if (tx_chan != NULL) {
tx_sample_rate = rate;
tx_data_bit_width = bits_cfg;
tx_slot_mode = ch;
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_init_pdm_tx_mode(tx_chan, &i2s_pdm_tx_config));
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_enable(tx_chan));
}
// Peripheral manager set bus type to I2S
if (_tx_clk >= 0) {
if (!perimanSetPinBus(_tx_clk, ESP32_BUS_TYPE_I2S_PDM_TX_CLK, (void *)(this), -1, -1)) {
goto err;
}
}
if (_tx_dout0 >= 0) {
if (!perimanSetPinBus(_tx_dout0, ESP32_BUS_TYPE_I2S_PDM_TX_DOUT0, (void *)(this), -1, -1)) {
goto err;
}
}
if (_tx_dout1 >= 0) {
if (!perimanSetPinBus(_tx_dout1, ESP32_BUS_TYPE_I2S_PDM_TX_DOUT1, (void *)(this), -1, -1)) {
goto err;
}
}
return true;
err:
log_e("Failed to set all pins bus to I2S_TDM");
I2SClass::i2sDetachBus((void *)(this));
return false;
}
#endif
#if SOC_I2S_SUPPORTS_PDM_RX
bool I2SClass::initPDMrx(uint32_t rate, i2s_data_bit_width_t bits_cfg, i2s_slot_mode_t ch) {
// Peripheral manager deinit previous peripheral if pin was used
if (_rx_clk >= 0) {
if (!perimanClearPinBus(_rx_clk)) {
return false;
}
}
if (_rx_din0 >= 0) {
if (!perimanClearPinBus(_rx_din0)) {
return false;
}
}
if (_rx_din1 >= 0) {
if (!perimanClearPinBus(_rx_din1)) {
return false;
}
}
if (_rx_din2 >= 0) {
if (!perimanClearPinBus(_rx_din2)) {
return false;
}
}
if (_rx_din3 >= 0) {
if (!perimanClearPinBus(_rx_din3)) {
return false;
}
}
// Set peripheral manager detach function for I2S
if (_rx_clk >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_PDM_RX_CLK, I2SClass::i2sDetachBus);
}
if (_rx_din0 >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_PDM_RX_DIN0, I2SClass::i2sDetachBus);
}
if (_rx_din1 >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_PDM_RX_DIN1, I2SClass::i2sDetachBus);
}
if (_rx_din2 >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_PDM_RX_DIN2, I2SClass::i2sDetachBus);
}
if (_rx_din3 >= 0) {
perimanSetBusDeinit(ESP32_BUS_TYPE_I2S_PDM_RX_DIN3, I2SClass::i2sDetachBus);
}
// I2S configuration
i2s_chan_config_t chan_cfg = I2S_DEFAULT_CFG();
I2S_ERROR_CHECK_RETURN_FALSE(i2s_new_channel(&chan_cfg, NULL, &rx_chan));
i2s_pdm_rx_config_t i2s_pdf_rx_config = I2S_PDM_RX_CHAN_CFG(rate, bits_cfg, ch);
if (rx_chan != NULL) {
rx_sample_rate = rate;
rx_data_bit_width = bits_cfg;
rx_slot_mode = ch;
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_init_pdm_rx_mode(rx_chan, &i2s_pdf_rx_config));
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_enable(rx_chan));
}
// Peripheral manager set bus type to I2S
if (_rx_clk >= 0) {
if (!perimanSetPinBus(_rx_clk, ESP32_BUS_TYPE_I2S_PDM_RX_CLK, (void *)(this), -1, -1)) {
goto err;
}
}
if (_rx_din0 >= 0) {
if (!perimanSetPinBus(_rx_din0, ESP32_BUS_TYPE_I2S_PDM_RX_DIN0, (void *)(this), -1, -1)) {
goto err;
}
}
if (_rx_din1 >= 0) {
if (!perimanSetPinBus(_rx_din1, ESP32_BUS_TYPE_I2S_PDM_RX_DIN1, (void *)(this), -1, -1)) {
goto err;
}
}
if (_rx_din2 >= 0) {
if (!perimanSetPinBus(_rx_din2, ESP32_BUS_TYPE_I2S_PDM_RX_DIN2, (void *)(this), -1, -1)) {
goto err;
}
}
if (_rx_din3 >= 0) {
if (!perimanSetPinBus(_rx_din3, ESP32_BUS_TYPE_I2S_PDM_RX_DIN3, (void *)(this), -1, -1)) {
goto err;
}
}
return true;
err:
log_e("Failed to set all pins bus to I2S_TDM");
I2SClass::i2sDetachBus((void *)(this));
return false;
}
#endif
bool I2SClass::begin(i2s_mode_t mode, uint32_t rate, i2s_data_bit_width_t bits_cfg, i2s_slot_mode_t ch, int8_t slot_mask) {
/* Setup I2S peripheral */
if (mode >= I2S_MODE_MAX) {
log_e("Invalid I2S mode selected.");
return false;
}
_mode = mode;
bool init = false;
switch (_mode) {
case I2S_MODE_STD: init = initSTD(rate, bits_cfg, ch, slot_mask); break;
#if SOC_I2S_SUPPORTS_TDM
case I2S_MODE_TDM: init = initTDM(rate, bits_cfg, ch, slot_mask); break;
#endif
#if SOC_I2S_SUPPORTS_PDM_TX
case I2S_MODE_PDM_TX: init = initPDMtx(rate, bits_cfg, ch); break;
#endif
#if SOC_I2S_SUPPORTS_PDM_RX
case I2S_MODE_PDM_RX: init = initPDMrx(rate, bits_cfg, ch); break;
#endif
default: break;
}
if (init == false) {
log_e("I2S initialization failed.");
return false;
}
return true;
}
bool I2SClass::end() {
if (tx_chan != NULL) {
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_disable(tx_chan));
I2S_ERROR_CHECK_RETURN_FALSE(i2s_del_channel(tx_chan));
tx_chan = NULL;
}
if (rx_chan != NULL) {
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_disable(rx_chan));
I2S_ERROR_CHECK_RETURN_FALSE(i2s_del_channel(rx_chan));
rx_chan = NULL;
}
if (rx_transform_buf != NULL) {
free(rx_transform_buf);
rx_transform_buf = NULL;
rx_transform_buf_len = 0;
}
//Peripheral manager deinit used pins
switch (_mode) {
case I2S_MODE_STD:
#if SOC_I2S_SUPPORTS_TDM
case I2S_MODE_TDM:
#endif
perimanClearPinBus(_mclk);
perimanClearPinBus(_bclk);
perimanClearPinBus(_ws);
if (_dout >= 0) {
perimanClearPinBus(_dout);
}
if (_din >= 0) {
perimanClearPinBus(_din);
}
break;
#if SOC_I2S_SUPPORTS_PDM_TX
case I2S_MODE_PDM_TX:
perimanClearPinBus(_tx_clk);
if (_tx_dout0 >= 0) {
perimanClearPinBus(_tx_dout0);
}
if (_tx_dout1 >= 0) {
perimanClearPinBus(_tx_dout1);
}
break;
#endif
#if SOC_I2S_SUPPORTS_PDM_RX
case I2S_MODE_PDM_RX:
perimanClearPinBus(_rx_clk);
if (_rx_din0 >= 0) {
perimanClearPinBus(_rx_din0);
}
if (_rx_din1 >= 0) {
perimanClearPinBus(_rx_din1);
}
if (_rx_din2 >= 0) {
perimanClearPinBus(_rx_din2);
}
if (_rx_din3 >= 0) {
perimanClearPinBus(_rx_din3);
}
break;
#endif
default: break;
}
return true;
}
bool I2SClass::configureTX(uint32_t rate, i2s_data_bit_width_t bits_cfg, i2s_slot_mode_t ch, int8_t slot_mask) {
/* Setup I2S channels */
if (tx_chan != NULL) {
if (tx_sample_rate == rate && tx_data_bit_width == bits_cfg && tx_slot_mode == ch) {
return true;
}
i2s_std_config_t i2s_config = I2S_STD_CHAN_CFG(rate, bits_cfg, ch);
if (slot_mask >= 0 && (i2s_std_slot_mask_t)slot_mask <= I2S_STD_SLOT_BOTH) {
i2s_config.slot_cfg.slot_mask = (i2s_std_slot_mask_t)slot_mask;
}
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_disable(tx_chan));
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_reconfig_std_clock(tx_chan, &i2s_config.clk_cfg));
tx_sample_rate = rate;
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_reconfig_std_slot(tx_chan, &i2s_config.slot_cfg));
tx_data_bit_width = bits_cfg;
tx_slot_mode = ch;
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_enable(tx_chan));
return true;
}
return false;
}
bool I2SClass::configureRX(uint32_t rate, i2s_data_bit_width_t bits_cfg, i2s_slot_mode_t ch, i2s_rx_transform_t transform) {
/* Setup I2S channels */
if (rx_chan != NULL) {
if (rx_sample_rate != rate || rx_data_bit_width != bits_cfg || rx_slot_mode != ch) {
i2s_std_config_t i2s_config = I2S_STD_CHAN_CFG(rate, bits_cfg, ch);
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_disable(rx_chan));
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_reconfig_std_clock(rx_chan, &i2s_config.clk_cfg));
rx_sample_rate = rate;
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_reconfig_std_slot(rx_chan, &i2s_config.slot_cfg));
rx_data_bit_width = bits_cfg;
rx_slot_mode = ch;
I2S_ERROR_CHECK_RETURN_FALSE(i2s_channel_enable(rx_chan));
return transformRX(transform);
}
if (rx_transform != transform) {
return transformRX(transform);
}
return true;
}
return false;
}
size_t I2SClass::readBytes(char *buffer, size_t size) {
size_t bytes_read = 0;
size_t bytes_to_read = 0;
size_t total_size = 0;
last_error = ESP_FAIL;
if (rx_chan == NULL) {
return total_size;
}
while (total_size < size) {
bytes_read = 0;
bytes_to_read = size - total_size;
if (rx_transform_buf != NULL && bytes_to_read > I2S_READ_CHUNK_SIZE) {
bytes_to_read = I2S_READ_CHUNK_SIZE;
}
I2S_ERROR_CHECK_RETURN(rx_fn(rx_chan, rx_transform_buf, (char *)(buffer + total_size), bytes_to_read, &bytes_read, _timeout), 0);
total_size += bytes_read;
}
return total_size;
}
size_t I2SClass::write(const uint8_t *buffer, size_t size) {
size_t written = 0;
size_t bytes_sent = 0;
size_t bytes_to_send = 0;
last_error = ESP_FAIL;
if (tx_chan == NULL) {
return written;
}
while (written < size) {
bytes_sent = 0;
bytes_to_send = size - written;
esp_err_t err = i2s_channel_write(tx_chan, (char *)(buffer + written), bytes_to_send, &bytes_sent, _timeout);
setWriteError(err);
I2S_ERROR_CHECK_RETURN(err, written);
written += bytes_sent;
}
return written;
}
i2s_chan_handle_t I2SClass::txChan() {
return tx_chan;
}
uint32_t I2SClass::txSampleRate() {
return tx_sample_rate;
}
i2s_data_bit_width_t I2SClass::txDataWidth() {
return tx_data_bit_width;
}
i2s_slot_mode_t I2SClass::txSlotMode() {
return tx_slot_mode;
}
i2s_chan_handle_t I2SClass::rxChan() {
return rx_chan;
}
uint32_t I2SClass::rxSampleRate() {
return rx_sample_rate;
}
i2s_data_bit_width_t I2SClass::rxDataWidth() {
return rx_data_bit_width;
}
i2s_slot_mode_t I2SClass::rxSlotMode() {
return rx_slot_mode;
}
int I2SClass::lastError() {
return (int)last_error;
}
int I2SClass::available() {
if (rx_chan == NULL) {
return -1;
}
return I2S_READ_CHUNK_SIZE; // / (rx_data_bit_width/8);
};
int I2SClass::peek() {
return -1;
};
int I2SClass::read() {
int out = 0;
if (readBytes((char *)&out, rx_data_bit_width / 8) == (rx_data_bit_width / 8)) {
return out;
}
return -1;
};
size_t I2SClass::write(uint8_t d) {
return write(&d, 1);
}
bool I2SClass::transformRX(i2s_rx_transform_t transform) {
switch (transform) {
case I2S_RX_TRANSFORM_NONE:
allocTranformRX(0);
rx_fn = i2s_channel_read_default;
break;
case I2S_RX_TRANSFORM_32_TO_16:
if (rx_data_bit_width != I2S_DATA_BIT_WIDTH_32BIT) {
log_e("Wrong data width. Should be 32bit");
return false;
}
if (!allocTranformRX(I2S_READ_CHUNK_SIZE * 2)) {
return false;
}
rx_fn = i2s_channel_read_32_to_16;
rx_data_bit_width = I2S_DATA_BIT_WIDTH_16BIT;
break;
case I2S_RX_TRANSFORM_16_STEREO_TO_MONO:
if (rx_slot_mode != I2S_SLOT_MODE_STEREO) {
log_e("Wrong slot mode. Should be Stereo");
return false;
}
if (!allocTranformRX(I2S_READ_CHUNK_SIZE * 2)) {
return false;
}
rx_fn = i2s_channel_read_16_stereo_to_mono;
rx_slot_mode = I2S_SLOT_MODE_MONO;
break;
default: log_e("Unknown RX Transform %d", transform); return false;
}
rx_transform = transform;
return true;
}
bool I2SClass::allocTranformRX(size_t buf_len) {
char *buf = NULL;
if (buf_len == 0) {
if (rx_transform_buf != NULL) {
free(rx_transform_buf);
rx_transform_buf = NULL;
rx_transform_buf_len = 0;
}
return true;
}
if (rx_transform_buf == NULL || rx_transform_buf_len != buf_len) {
buf = (char *)malloc(buf_len);
if (buf == NULL) {
log_e("malloc %u failed!", buf_len);
return false;
}
if (rx_transform_buf != NULL) {
free(rx_transform_buf);
}
rx_transform_buf = buf;
rx_transform_buf_len = buf_len;
}
return true;
}
const int WAVE_HEADER_SIZE = PCM_WAV_HEADER_SIZE;
//Record PCM WAV with current RX settings
uint8_t *I2SClass::recordWAV(size_t rec_seconds, size_t *out_size) {
uint32_t sample_rate = rxSampleRate();
uint16_t sample_width = (uint16_t)rxDataWidth();
uint16_t num_channels = (uint16_t)rxSlotMode();
size_t rec_size = rec_seconds * ((sample_rate * (sample_width / 8)) * num_channels);
const pcm_wav_header_t wav_header = PCM_WAV_HEADER_DEFAULT(rec_size, sample_width, sample_rate, num_channels);
*out_size = 0;
log_d("Record WAV: rate:%lu, bits:%u, channels:%u, size:%lu", sample_rate, sample_width, num_channels, rec_size);
uint8_t *wav_buf = (uint8_t *)malloc(rec_size + WAVE_HEADER_SIZE);
if (wav_buf == NULL) {
log_e("Failed to allocate WAV buffer with size %u", rec_size + WAVE_HEADER_SIZE);
return NULL;
}
memcpy(wav_buf, &wav_header, WAVE_HEADER_SIZE);
size_t wav_size = readBytes((char *)(wav_buf + WAVE_HEADER_SIZE), rec_size);
if (wav_size < rec_size) {
log_e("Recorded %u bytes from %u", wav_size, rec_size);
} else if (lastError()) {
log_e("Read Failed! %d", lastError());
} else {
*out_size = rec_size + WAVE_HEADER_SIZE;
return wav_buf;
}
free(wav_buf);
return NULL;
}
void I2SClass::playWAV(uint8_t *data, size_t len) {
pcm_wav_header_t *header = (pcm_wav_header_t *)data;
if (header->fmt_chunk.audio_format != 1) {
log_e("Audio format is not PCM!");
return;
}
wav_data_chunk_t *data_chunk = &header->data_chunk;
size_t data_offset = 0;