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Get number of tracks from SD card #1

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Get number of tracks from SD card #1

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16 changes: 16 additions & 0 deletions dfplayermini.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import utime
import ubinascii
from machine import UART, Timer

IDLE = 0
Expand Down Expand Up @@ -44,6 +45,21 @@ def play(self, track_id=False):
elif isinstance(track_id, int):
self.cmd(0x03, track_id)

def num_tracks_sd(self):
print(f'throw away current serial input buffer: {self.uart.read()}')
self.cmd(0x48)
utime.sleep(0.5)
response = self.uart.read()
# TODO:
# - error handling for sd card communication
# - properly parse response with correct opcode
# instead of just throwing them away and guessing
# that the number is in between 7eff0648 and fea8ef
# with typical response being b'7eff064800000bfea8ef'
# where the number of tracks on the SD card is
# '00000b' in hex (11 in decimal)
return int(ubinascii.hexlify(response)[8:-6], 16)

def pause(self):
self.cmd(0x0E)

Expand Down