ESP32_PDM_SampleCode.ino

//
//  Sound
//
#include "driver/i2s.h"
#include "driver/gpio.h"

#include "ching.h"
#include "clap.h"
#include "cymbal.h"
#include "voice.h"

const i2s_port_t I2S_NUM = (i2s_port_t)0;


const i2s_bits_per_sample_t BITS_PER_SAMPLE = (i2s_bits_per_sample_t)16;

//  PDM
void set_16k_16() {
  i2s_set_pin(I2S_NUM, NULL);

  i2s_config_t i2s_config;
  i2s_config.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_PDM);       // Only TX
  i2s_config.sample_rate = 16000;
  i2s_config.bits_per_sample = BITS_PER_SAMPLE;
  i2s_config.channel_format = I2S_CHANNEL_FMT_ONLY_RIGHT;                //right channels
  //  i2s_config.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT;                //right left
  i2s_config.communication_format = I2S_COMM_FORMAT_PCM;
  i2s_config.dma_buf_count = 4;
  i2s_config.dma_buf_len =  1024;
  i2s_config.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1;                    //Interrupt level 1

  i2s_driver_install(I2S_NUM, &i2s_config, 0, NULL);
}


void setup()
{
  Serial.begin(115200);
  
  set_16k_16();  

  Serial.println("setup end");
}


int iSound = 0;

void loop()
{
  Serial.println("ching");
  i2s_write_bytes(I2S_NUM, (const char *)ching, sizeof(ching),   portMAX_DELAY);
  delay(500);
  Serial.println("clap");
  i2s_write_bytes(I2S_NUM, (const char *)clap,  sizeof(clap),    portMAX_DELAY);
  delay(500);
  Serial.println("cymbal");
  i2s_write_bytes(I2S_NUM, (const char *)cymbal, sizeof(cymbal), portMAX_DELAY);
  delay(500);
  Serial.println("voice");
  i2s_write_bytes(I2S_NUM, (const char *)voice,  sizeof(voice),  portMAX_DELAY); 
  delay(500);
}