- // Connections to INMP441 I2S microphone
- #define I2S_WS 25
- #define I2S_SD 33
- #define I2S_SCK 32
- // Use I2S Processor 0
- #define I2S_PORT I2S_NUM_0
- #define bufferCount 8
- #define bufferLen 64
- int16_t buffer16[bufferLen] = {0};
- uint8_t buffer32[bufferLen * 4] = {0};
- // Set up I2S Processor configuration
- void i2s_install() {
- // Set up I2S Processor configuration
- i2s_config_t i2s_config = {
- .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
- .sample_rate = 4000, // or 44100 if you like
- .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
- .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT, // Ground the L/R pin on the INMP441.
- .communication_format = (i2s_comm_format_t)(I2S_COMM_FORMAT_STAND_I2S),
- .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
- .dma_buf_count = bufferCount,
- .dma_buf_len = bufferLen,
- .use_apll = false,
- .tx_desc_auto_clear = false,
- .fixed_mclk = 0,
- };
- i2s_driver_install(I2S_PORT, &i2s_config, 0, NULL);
- }
- // Set I2S pin configuration
- void i2s_setpin() {
- const i2s_pin_config_t pin_config = {
- .bck_io_num = I2S_SCK,
- .ws_io_num = I2S_WS,
- .data_out_num = -1,
- .data_in_num = I2S_SD
- };
- i2s_set_pin(I2S_PORT, &pin_config);
- }
- while (1)
- {
- vTaskDelay(1); // Feed for watchdog, if not watchdog timer will be triggered!
- i2s_read(I2S_PORT, &buffer32, sizeof(buffer32), &bytesRead, 100);
- int samplesRead = bytesRead / 4;
- for (uint8_t i = 0; i < samplesRead; i++) {
- uint8_t mid = buffer32[i * 4 + 2];
- uint8_t msb = buffer32[i * 4 + 3];
- uint16_t raw = (((uint32_t)msb) << 8) + ((uint32_t)mid);
- memcpy(&buffer16[i], &raw, sizeof(raw)); // Copy so sign bits aren't interfered with somehow.
- printf("%d %d %d\n", 3000, -3000, buffer16[i]);
- }
- }
Please help me to find the solution for this problem.