#!/usr/bin/env python2.7
# python script to register an interrupt that will monitor for when a coin is entered and will process the 'coin' function by emulating a key press which is mapped in MAME
#sends the C and D keys one after the next. C and D are mapped to Coin1 and Coin2 so each actual coin entered allows for a two player game

import RPi.GPIO as GPIO
import logging
import datetime
import time
from evdev import UInput, ecodes as e

verbose=False
ui=UInput()
logging.basicConfig(filename='/home/pi/coin.log',level=logging.DEBUG)

def my_callback(channel):
	logging.debug('Coin Inserted at %s',datetime.datetime.now())
	if (verbose):
		print "\nCoin"
	ui.write(e.EV_KEY, e.KEY_C, 1)
	ui.syn()
	time.sleep(0.10)
	ui.write(e.EV_KEY, e.KEY_C, 0)
	ui.syn()
	time.sleep(0.10)
	ui.write(e.EV_KEY, e.KEY_D, 1)
	ui.syn()
	time.sleep(0.10)
	ui.write(e.EV_KEY, e.KEY_D, 0)
	ui.syn()

try:
	GPIO.setmode(GPIO.BCM)
	# GPIO 21 set up as an input, pulled up (normally closed circuit), connected to 3V3 on coin input from accepter machine
	GPIO.setup(21, GPIO.IN, pull_up_down=GPIO.PUD_UP)
	GPIO.add_event_detect(21, GPIO.FALLING, callback=my_callback)
	while (True):
		wait = True

finally:
	ui.close()
	GPIO.cleanup()