Volume Adjustment

Functionality

This example project demonstrates how to adjust the volume of the ReSpeaker Lite via I2C command.

AIC3204 I2C address: 0x18

Code

#include "AudioTools.h"
#include "Wire.h"

#define AIC3204_ADDR  0x18

AudioInfo info_16k(16000, 2, 32);
SineWaveGenerator<int16_t> sineWave(1000);                // subclass of SoundGenerator with max amplitude of 32000
GeneratedSoundStream<int16_t> sound(sineWave);             // Stream generated from sine wave

I2SStream out; 
I2SConfig config_i2s1;

//FormatConverterStream converter(in);
//StreamCopy copier(out, converter);
StreamCopy copier(out, sound);

uint32_t now_time = 0;
uint8_t level_index = 0;
int8_t level[10] = {0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x00, 0x01, 0x02, 0x03};

void aic3204_write_reg(uint8_t reg, uint8_t value)
{
  Wire.beginTransmission(AIC3204_ADDR);
  Wire.write(reg);
  Wire.write(value);
  Wire.endTransmission();
}


void setup(void) {  
  // Open Serial 
  Serial.begin(115200);
  Wire.begin(5,6);
  // while(!Serial);
//  AudioLogger::instance().begin(Serial, AudioLogger::Info);

  // start I2S
  Serial.println("starting I2S...");
  config_i2s1 = out.defaultConfig(TX_MODE);
  config_i2s1.copyFrom(info_16k); 
  // Custom I2S output pins
  config_i2s1.pin_bck = 8;
  config_i2s1.pin_ws = 7;
  config_i2s1.pin_data = 43;
  config_i2s1.pin_data_rx = 44;
  config_i2s1.is_master = false;
  out.begin(config_i2s1);

//  converter.begin(info_16k, info_48k);
  sineWave.begin(info_16k, N_B4);

  Serial.println("started...");
  
}

// Arduino loop - copy sound to out 
void loop() {
   copier.copy();
   if (millis() - now_time > 1000) {
    now_time = millis();
    aic3204_write_reg(0x00, 0x01);
    aic3204_write_reg(0x12, level[level_index]);
    aic3204_write_reg(0x13, level[level_index]);
    Serial.print("level: ");
    Serial.println(level_index);
    level_index = level_index + 2;
    if (level_index >= 10) level_index = 0;
   }
}