dfplayer-mini.py

#!/usr/bin/env python3
"""
Quick script to test DFPlayer Mini MP3 module

- https://wiki.dfrobot.com/DFPlayer_Mini_SKU_DFR0299
"""

import sys
from serial import Serial

CMD_NEXT      = 0x01
CMD_PREV      = 0x02
CMD_TRACK     = 0x03
CMD_VOLUP     = 0x04
CMD_VOLDOWN   = 0x05
CMD_VOLSET    = 0x06
CMD_MUSICMODE = 0x07
CMD_PLAYMODE  = 0x08
CMD_SOURCE    = 0x09
CMD_SLEEP     = 0x0A
CMD_WORK      = 0x0B
CMD_RESET     = 0x0C
CMD_PLAY      = 0x0D
CMD_PAUSE     = 0x0E
CMD_FOLDER    = 0x0F
CMD_VOLADJ    = 0x10
CMD_REPEAT    = 0x11

def dfcmd(cmd, feedback, para1, para2):
  buf = bytearray(b'\x7E\xFF\x06\x00\x00\x00\x00\xFF\xFF\xEF')
  buf[3] = cmd
  buf[4] = feedback
  buf[5] = para1
  buf[6] = para2

  cksum = 0xFFFF - sum(buf[1:7]) + 1
  buf[7] = cksum >> 8
  buf[8] = cksum & 0xFF

  return buf

def cmd_next():
  return dfcmd(CMD_NEXT, 0, 0, 0)

def cmd_prev():
  return dfcmd(CMD_PREV, 0, 0, 0)

def cmd_track():
  return dfcmd(CMD_TRACK, 0, 0, 2)

def cmd_volup():
  return dfcmd(CMD_VOLUP, 0, 0, 0)

def cmd_voldown():
  return dfcmd(CMD_VOLDOWN, 0, 0, 0)

def cmd_volset():
  return dfcmd(CMD_VOLSET, 0, 0, 25)

def cmd_playmode():
  return dfcmd(CMD_PLAYMODE, 0, 0, 3)

def cmd_sleep():
  return dfcmd(CMD_SLEEP, 0, 0, 0)

def cmd_work():
  return dfcmd(CMD_WORK, 0, 0, 0)

def cmd_reset():
  return dfcmd(CMD_RESET, 0, 0, 0)

def cmd_play():
  return dfcmd(CMD_PLAY, 0, 0, 0)

def cmd_pause():
  return dfcmd(CMD_PAUSE, 0, 0, 0)

def main():
  p = sys.argv[0]
  if len(sys.argv) < 3:
    print("Usage: {p} <port> (play|pause|next|prev|...)".format(**locals()))
    sys.exit(0)

  port = sys.argv[1]
  cmd  = sys.argv[2]

  sp = Serial(port=port)
  buf = eval("cmd_" + cmd)()
  sp.write(buf)
  sp.close()

if __name__ == '__main__':
  main()