Create mp3.py

Implementation of the mp3 player code for the YX5300 module.

mp3.py

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+from time import sleep
+from machine import UART
+uart=UART(0,9600)
+import yx5300 as cmd
+
+# set initial volume to mid point 
+volume_level=15 
+
+initialized=False
+
+# do necessary initialization
+# Currently only the volume is set
+def initialize():
+	global initialized
+	global volume_level
+	if not initialized:
+		set_volume(volume_level)
+		initialized=True
+		sleep(0.5)
+
+def next():
+	initialize()		
+	uart.write(cmd.play_next())
+
+def previous():
+	initialize()
+	uart.write(cmd.play_previous())
+
+def hibernate():
+	uart.write(cmd.sleep_module())
+
+def wakeup():
+	uart.write(cmd.wake_module())
+	
+def reset():
+	global initialized
+	initialized=False
+	uart.write(cmd.reset_module())
+	
+	
+def play_track(track_id):
+	initialize()
+	uart.write(cmd.play_track(track_id))
+
+def play():
+	initialize()
+	play_track(1);
+	
+def pause():
+	uart.write(cmd.pause())
+
+def resume():
+	uart.write(cmd.resume())
+	
+def stop():
+	uart.write(cmd.stop())
+
+def set_volume(level):
+	global volume_level
+	volume_level=level
+	uart.write(cmd.set_volume(level))
+	
+def volume_up(step_count=1):
+	global volume_level
+	volume_level=volume_level+step_count
+	set_volume(volume_level)
+			
+def volume_down(step_count=1):
+	global volume_level
+	volume_level=volume_level-step_count
+	set_volume(volume_level)
+
+def mute():
+	uart.write(cmd.set_volume(0))
+	
+def unmute():
+	global volume_level
+	uart.write(cmd.set_volume(volume_level))
+
+def get_volume():
+	global volume_level
+	return volume_level