MP3.cpp

#include "MP3.h"

SoftwareSerial mp3(ARDUINO_RX, ARDUINO_TX);
void mp3_command(int8_t command, int16_t dat) {
  int8_t frame[8] = { 0 };
  frame[0] = 0x7e;                // starting byte
  frame[1] = 0xff;                // version
  frame[2] = 0x06;                // the number of bytes of the command without starting byte and ending byte
  frame[3] = command;             //
  frame[4] = 0x00;                // 0x00 = no feedback, 0x01 = feedback
  frame[5] = (int8_t)(dat >> 8);  // data high byte
  frame[6] = (int8_t)(dat);       // data low byte
  frame[7] = 0xef;                // ending byte
  for (uint8_t i = 0; i < 8; i++) {
    mp3.write(frame[i]);
  }
}