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feat(i2s): support to select PDM data format

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This commit is contained in:
laokaiyao
2024-08-15 19:02:42 +08:00
parent 390745c999
commit 9b779d8b3c
37 changed files with 863 additions and 254 deletions
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examples/peripherals/i2s/i2s_basic/i2s_pdm/main/i2s_pdm_rx.c
+19 -2
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@@ -15,6 +15,7 @@
#include "sdkconfig.h"
#include "i2s_pdm_example.h"
#include "i2s_example_pins.h"
#include "esp_log.h"
#define EXAMPLE_PDM_RX_CLK_IO EXAMPLE_I2S_BCLK_IO1 // I2S PDM RX clock io number
#define EXAMPLE_PDM_RX_DIN_IO EXAMPLE_I2S_DIN_IO1 // I2S PDM RX data in io number
@@ -24,10 +25,21 @@
#define EXAMPLE_PDM_RX_DIN3_IO EXAMPLE_I2S_DIN3_IO1 // I2S PDM RX data line3 in io number
#endif
#define EXAMPLE_PDM_RX_FREQ_HZ 16000 // I2S PDM RX frequency
#if SOC_I2S_SUPPORTS_PDM2PCM
#define EXAMPLE_PDM_RX_FREQ_HZ 16000 // I2S PDM RX frequency in PCM format
#else
#define EXAMPLE_PDM_RX_FREQ_HZ 2048000 // I2S PDM RX over sample frequency in raw PDM format
#endif
static const char *TAG = "i2s_pdm_rx";
static i2s_chan_handle_t i2s_example_init_pdm_rx(void)
{
#if SOC_I2S_SUPPORTS_PDM2PCM
ESP_LOGI(TAG, "I2S PDM RX example (receiving data in PCM format)");
#else
ESP_LOGI(TAG, "I2S PDM RX example (receiving data in raw PDM format)");
#endif // SOC_I2S_SUPPORTS_PDM2PCM
i2s_chan_handle_t rx_chan; // I2S rx channel handler
/* Setp 1: Determine the I2S channel configuration and allocate RX channel only
* The default configuration can be generated by the helper macro,
@@ -42,7 +54,12 @@ static i2s_chan_handle_t i2s_example_init_pdm_rx(void)
i2s_pdm_rx_config_t pdm_rx_cfg = {
.clk_cfg = I2S_PDM_RX_CLK_DEFAULT_CONFIG(EXAMPLE_PDM_RX_FREQ_HZ),
/* The data bit-width of PDM mode is fixed to 16 */
.slot_cfg = I2S_PDM_RX_SLOT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_MONO),
#if SOC_I2S_SUPPORTS_PDM2PCM
.slot_cfg = I2S_PDM_RX_SLOT_PCM_FMT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_MONO),
#else
// For the target that not support PDM-to-PCM format, we can only receive RAW PDM data format
.slot_cfg = I2S_PDM_RX_SLOT_RAW_FMT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_MONO),
#endif // SOC_I2S_SUPPORTS_PDM2PCM
.gpio_cfg = {
.clk = EXAMPLE_PDM_RX_CLK_IO,
#if SOC_I2S_PDM_MAX_RX_LINES == 4