soundslab/SoundslabInput.py

import signal
import RPi.GPIO as GPIO
from SoundslabDisplay import SoundslabDisplay
import time
import musicpd

# connect to mpd
player_client = musicpd.MPDClient()
player_client.connect()

# The buttons on Pirate Audio are connected to pins 5, 6, 16 and 24
# Boards prior to 23 January 2020 used 5, 6, 16 and 20 
# try changing 24 to 20 if your Y button doesn't work.
BUTTONS = [5, 6, 16, 24, 17, 27, 22, 23, 20]

# These correspond to buttons A, B, X and Y then the five-way switch positions
LABELS = ['NW', 'SW', 'NE', 'SE', 'UP', 'SELECT', 'LF', 'DN', 'RT']

# Set up RPi.GPIO with the "BCM" numbering scheme
GPIO.setmode(GPIO.BCM)

# Buttons connect to ground when pressed, so we should set them up
# with a "PULL UP", which weakly pulls the input signal to 3.3V.
GPIO.setup(BUTTONS, GPIO.IN, pull_up_down=GPIO.PUD_UP)

# some button handlers
def NE():
    # play/pause toggle
    global player_client
    status = player_client.status()
    if status['state'] == "play":
        print("pausing")
        player_client.pause(1)
    elif status['state'] == "pause":
        print("resuming")
        player_client.pause(0)
    else: # state == "stop"
        print("playing")
        player_client.play()

def SW():
    # previous track
    global player_client
    status = player_client.status()
    if float(status['elapsed']) > 5.0:
        # restart track
        print("restart current track")
        player_client.seekcur(0)
    else:
        # go to previous track
        print("previous track")
        player_client.previous()

def NW():
    # open menu
    pass

def SE():
    # next track
    global player_client
    print("next track")
    player_client.next()

def UP():
    # volume up 10%
    global player_client
    print("vol up")
    status = player_client.status()
    if int(status['volume']) < 100:
        player_client.setvol(int(status['volume']) + 10)

def DN():
    # volume down 10%
    global player_client
    print("vol down")
    status = player_client.status()
    if int(status['volume']) > 0:
        player_client.setvol(int(status['volume']) - 10)

def LF():
    # seek back 10s
    pass

def RT():
    # seek forward 10s
    pass

def SELECT():
    # display lock/unlock
    pass

# This is a dictionary of the combination of pins and labels
LABELLED_BUTTONS = {
    5: NW,
    6: SW,
    16: NE,
    24: SE,
    17: UP,
    27: SELECT,
    22: LF,
    23: DN,
    20: RT
}

# "handle_button" will be called every time a button is pressed
# It receives one argument: the associated input pin.
def handle_button(pin):
    label = LABELS[BUTTONS.index(pin)]
    print("Button press detected on pin: {} label: {}".format(pin, label))
    func = LABELLED_BUTTONS.get(pin)
    func()

# Loop through out buttons and attach the "handle_button" function to each
# We're watching the "FALLING" edge (transition from 3.3V to Ground) and
# picking a generous bouncetime of 100ms to smooth out button presses.
for pin in BUTTONS:
    GPIO.add_event_detect(pin, GPIO.FALLING, handle_button, bouncetime=100)

# initialize the display
display = SoundslabDisplay(player_client)

while True:
    # test album art
    display.updateAlbumArt()
    # test setting up the overlay
    display.updateOverlay()
    # test pushing the update to the display
    display.updateDisplay()
    # wait before continuing
    time.sleep(1.0)