DF player issues

Using Arduino Audio
1

Hi,

I am trying to use a DF player mini in my project. After trying and testing I encounter the following issue; the DF player sometimes (more often than not) ignores the serial commands. I can see the TX led blink but the DF player doesn't respond. I am using Arduino nanos.

Here is my code:

Test_DFplayer.ino

#include "DFplayer.h"

void setup() {
  setup_DF();
}

void loop() {
  
}

DFplayer.h:

#ifndef DF_PLAYER_H
#define DF_PLAYER_H


#define DF_STARTUP_VOL 15

# define Start_Byte 0x7E
# define Version_Byte 0xFF
# define Command_Length 0x06
# define End_Byte 0xEF
# define Acknowledge 0x00 //Returns info with command 0x41 [0x01: info, 0x00: no info]

#define c_play_file  0x0F
#define c_set_volume 0x06
#define c_stop_track 0x16
#define c_play       0x0D
#define c_pause      0x0E
#define c_setvolume  0x06
#define c_initialize 0x3F
#define c_track_mode 0x08
#define c_stop       0x16
#define c_equalizer  0x07
#define C_RESET_MODULE 0x0C
#define C_REPEAT_PLAY 0x11

void setup_DF(HardwareSerial& s = Serial);

void DF_initialize(HardwareSerial& s = Serial);
void DF_playfile(byte folder_num, byte file_num, HardwareSerial& s = Serial);
void DF_track_mode(byte track_mode, HardwareSerial& s = Serial);
void DF_pause();
void DF_stop();
void DF_play();
void DF_setVolume(int vol, HardwareSerial& s = Serial);
void DF_reset(HardwareSerial& s = Serial);
void DF_repeat_play(byte mode, HardwareSerial& s = Serial);

void DF_execute_CMD(byte CMD, byte Par1, byte Par2, HardwareSerial& s);

#endif

DFplayer.cpp:

#include <Arduino.h>
#include "DFplayer.h"

void setup_DF(HardwareSerial& s = Serial)
{
  s.begin(9600);
  DF_initialize(s);
  //DF_reset(s);
  //DF_repeat_play(0, s);
  //DF_track_mode(0, s);
  DF_setVolume(DF_STARTUP_VOL, s);
  DF_playfile(1, 1, s);
}

void DF_initialize(HardwareSerial& s = Serial)
{
  DF_execute_CMD(c_initialize, 0, 0, s);
  //delay(300);
}

void DF_playfile(byte folder_num, byte file_num, HardwareSerial& s = Serial)
{
  DF_execute_CMD(c_play_file, folder_num, file_num, s);
  //delay(30);
}

void DF_track_mode(byte track_mode, HardwareSerial& s = Serial)
{
  DF_execute_CMD(c_track_mode, 0, track_mode, s);
}

void DF_reset(HardwareSerial& s = Serial)
{
   DF_execute_CMD(C_RESET_MODULE, 0, 0, s);
}

void DF_repeat_play(byte mode, HardwareSerial& s = Serial)
{
  DF_execute_CMD(C_REPEAT_PLAY, 0, 0, s);
}


//void DF_pause()
//{
//  DF_execute_CMD(c_pause,0,0);
//  //delay(30);
//}
//
//void DF_stop()
//{
//  DF_execute_CMD(c_stop,0,0);
//}
//
//void DF_play()
//{
//  DF_execute_CMD(c_play,0,1); 
//  //delay(30);
//}

void DF_setVolume(int vol, HardwareSerial& s = Serial)
{
  DF_execute_CMD(c_setvolume, 0, vol, s); // Set the volume (0x00~0x30)
  //delay(30);
}

void DF_execute_CMD(byte CMD, byte Par1, byte Par2, HardwareSerial& s = Serial)
  // Excecute the command and parameters
{
  // Calculate the checksum (2 bytes)
  word checksum = -(Version_Byte + Command_Length + CMD + Acknowledge + Par1 + Par2);
  // Build the command line
  byte Command_line[10] = { Start_Byte, Version_Byte, Command_Length, CMD, Acknowledge,
  Par1, Par2, highByte(checksum), lowByte(checksum), End_Byte};
  //Send the command line to the module
  for (byte k=0; k<10; k++)
  {
    s.write(Command_line[k]);
  }
}

One of my Arduinos has a sketch uploaded in which the DFplayer responds to all the commands as intended; but I can't find that sketch.

Hardware:
Arduino TX -> DFplayer RX
Arduino RX -> DFplayer TX

I tried both having 1k series resistors and not on the serial lines but it makes no difference.

Thank you.

3

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