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/**
* ESP32 I2S Serial Plotter Example.
*
* This example is based on the espressif-idf example and Public Domain.
* @author maspetsberger
*/
#include <driver/i2s.h>
const i2s_port_t I2S_PORT = I2S_NUM_0;
void setup() {
Serial.begin(115200);
Serial.println("Configuring I2S...");
esp_err_t err;
// The I2S config as per the example
const i2s_config_t i2s_config = {
.mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_RX), // Receive, not transfer
.sample_rate = 16000, // 16KHz
.bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT, // could only get it to work with 32bits
.channel_format = I2S_CHANNEL_FMT_ONLY_RIGHT, // although the SEL config should be left, it seems to transmit on right
.communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB),
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1, // Interrupt level 1
.dma_buf_count = 4, // number of buffers
.dma_buf_len = 8 // 8 samples per buffer (minimum)
};
// The pin config as per the setup
const i2s_pin_config_t pin_config = {
.bck_io_num = 14, // BCKL
.ws_io_num = 15, // LRCL
.data_out_num = -1, // not used (only for speakers)
.data_in_num = 32 // DOUT
};
// Configuring the I2S driver and pins.
// This function must be called before any I2S driver read/write operations.
err = i2s_driver_install(I2S_PORT, &i2s_config, 0, NULL);
if (err != ESP_OK) {
Serial.printf("Failed installing driver: %d\n", err);
while (true);
}
err = i2s_set_pin(I2S_PORT, &pin_config);
if (err != ESP_OK) {
Serial.printf("Failed setting pin: %d\n", err);
while (true);
}
Serial.println("I2S driver installed.");
}
void loop() {
// Read a single sample and log it for the Serial Plotter.
int32_t sample = 0;
int bytes_read = i2s_pop_sample(I2S_PORT, (char *)&sample, portMAX_DELAY); // no timeout
if (bytes_read > 0) {
Serial.println(sample);
}
}
// actually we would need to call `i2s_driver_uninstall(I2S_PORT)` upon exit.
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