this is my code:
Code: Select all
#include <driver/i2s.h>
#define SAMPLE_BUFFER_SIZE 512
#define SAMPLE_RATE 8000
#define I2S_MIC_CHANNEL I2S_CHANNEL_FMT_ONLY_LEFT
#define I2S_MIC_SERIAL_CLOCK 22
#define I2S_MIC_LEFT_RIGHT_CLOCK 26
#define I2S_MIC_SERIAL_DATA 21
i2s_config_t i2s_config = {
.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
.sample_rate = SAMPLE_RATE,
.bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
.communication_format = I2S_COMM_FORMAT_I2S,
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
.dma_buf_count = 4,
.dma_buf_len = 1024,
.use_apll = false,
.tx_desc_auto_clear = false,
.fixed_mclk = 0};
i2s_pin_config_t i2s_mic_pins = {
.bck_io_num = I2S_MIC_SERIAL_CLOCK,
.ws_io_num = I2S_MIC_LEFT_RIGHT_CLOCK,
.data_out_num = I2S_PIN_NO_CHANGE,
.data_in_num = I2S_MIC_SERIAL_DATA};
void setup()
{
Serial.begin(115200);
// start up the I2S peripheral
i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
i2s_set_pin(I2S_NUM_0, &i2s_mic_pins);
}
int32_t raw_samples[SAMPLE_BUFFER_SIZE];
void loop()
{
// read from the I2S device
size_t bytes_read = 0;
i2s_read(I2S_NUM_0, raw_samples, sizeof(int32_t) * SAMPLE_BUFFER_SIZE, &bytes_read, portMAX_DELAY);
int samples_read = bytes_read / sizeof(int32_t);
// dump the samples out to the serial channel.
for (int i = 0; i < samples_read; i++)
{
Serial.printf("%ld\n", raw_samples[i]);
}
}