main.py

import RN52  # for interfacing with the RN52 board.
import PyPod  # python ipod emulator (port this shit also fix it/improve it).
import time
import board
# import busio
from digitalio import DigitalInOut, Direction, Pull

'''
GPIO stuff:
Setup 2 GPIO PINs.
- 1) output to RN52 to be in command mode. Set high for command mode.
- 2) input to monitor GPIO2 on RN52 (change flag/inicator).
    Pulled low to indicate change.
'''
CommandMode = DigitalInOut(board.D13)
CommandMode.direction = Direction.OUTPUT
CommandMode = True

ChangeFlag = DigitalInOut(board.D7)
ChangeFlag.direction = Direction.INPUT
ChangeFlag.pull = Pull.UP

'''
Initialize things.
'''

# Init the RN52 and PyPod modules.
# This brings up the UART/Serial interface in each.
RN52.RN52init()
time.sleep(2)
PyPod.init()

# Get some metadata. Might be dummy data but its
# something stored to be used later.
MetaData = RN52.GetMetaData()
# Push the metadata to the ipod module.
PyPod.MetaDataUpdate(MetaData)
# print(time.monotonic())

# Get Connection Status.
RN52Status = RN52.GetStatus()
print('inital status : ' + str(RN52Status))
if RN52Status[3] == 'D':
    print('Playing')
    # PyPod.SetPlayStatus(True)
else:
    print('Not Playing')
    # PyPod.SetPlayStatus(False)
# print('PlayStatus: ' + str(PyPod.PlayStatus))

if RN52Status[1] == '0':
    MetaData['Title'] = 'Not Connected'
# print(MetaData)

'''
Check status of ChangeFlag Input pin.
Inverting flag value as its based on an input state being true or false.
where low indicates false indicates change.
'''
def ChangeCheck():
    if ChangeFlag.value is False:
        return(True)
    else:
        return(False)

'''
Process Command Reqests.
if a play control command then send it.
can build out more commands later.
'''
def ProcessCmdReq(cmd):
    cmd = cmd.lower()
    if cmd == 'playpause' or cmd == 'next' or cmd == 'prev':
        print('PlayCommand: ' +  cmd)
        if cmd == 'playpause' and PyPod.PlayStatus is True:
            PyPod.PlayStatus = False
        else:
            PyPod.PlayStatus = True

        if cmd == 'next' or cmd == 'prev':
            PyPod.TrackChangeNotification('TrackUpdate')


        if RN52.PlayControl(cmd):
            return (True)
        else:
            return (False)

'''
Main loop.
'''
StartTime = round(time.monotonic() * 1000)
UpdateTimer = StartTime
MDTimer = StartTime
while(True):
    #elapsed = round(time.monotonic() * 1000 - StartTime)
    if time.monotonic() * 1000 - UpdateTimer > 500 and PyPod.PlayChangeNotification:
        PyPod.TrackChangeNotification()
        UpdateTimer = round(time.monotonic() * 1000)

    #Force check for MetaData update if X time has passed.
    if time.monotonic() * 1000 - MDTimer > 15000:
        print('Checking Stored MetaData against RN52 MetaData')
        NewMD = RN52.GetMetaData()
        if NewMD != MetaData:
            print('MetaData changed: sending track update')
            MetaData = NewMD
            PyPod.MetaDataUpdate(MetaData)
            PyPod.TrackChangeNotification('TrackUpdate')
        MDTimer = round(time.monotonic() * 1000)

    if PyPod.MetaData != MetaData:
        PyPod.MetaDataUpdate(MetaData)
        PyPod.TrackChangeNotification('TrackUpdate')

    if ChangeCheck():
        NewStatus = RN52.GetStatus()
        print('Change detected: ' + str(RN52Status) + ' to ' + str(NewStatus))

        if NewStatus != RN52Status:
            if NewStatus[0] == '2':
                NewMD = RN52.GetMetaData()
                while NewMD == MetaData:
                    print('Updating MetaData')
                    NewMD = RN52.GetMetaData()
                MetaData = NewMD
                PyPod.MetaDataUpdate(NewMD)
                PyPod.TrackChangeNotification('TrackUpdate')
            if NewStatus[3] == 'D' and RN52Status[3] == '3':
                print('Play Status changed to: Playing')
                PyPod.SetPlayStatus(True)
            if NewStatus[3] == '3' and RN52Status[3] == 'D':
                print('Play Status changed to: Not Playing')
                # PyPod.SetPlayStatus(False)
            if NewStatus[1] == '4' and RN52Status[1] == '0':
                print('Connection Status changed to: Connected')
            if NewStatus[1] == '0' and RN52Status[1] == '4':
                print('Connection status changed to: Not connected')
                MetaData['Title'] = 'Not Connected'
        # reset status as the track change flag changes back after query.
        RN52Status = RN52.GetStatus()

    iPodcommand = PyPod.ReadCommand()
    if iPodcommand:
        PyPod.CmdProcessor(iPodcommand)
    # Check if there are any Command Requests from the ipod iterface
    # Next Track, Play, ETC, MetaDataUpdate...
    if PyPod.CmdReqsPending():
        ProcessCmdReq(PyPod.GetExtCmdReq())