import time
from machine import I2C, Pin, Timer
from I2C_LCD import I2CLcd

i2c = I2C(1, sda=Pin(14), scl=Pin(15), freq=400000)
devices = i2c.scan()
timer = Timer()

count = 0;
pause = False

def tick(timer):
    global count
    global buttonPause
    global buttonReset
    
    if (not pause):
        count = count + 1
        
    lcd.clear();
    lcd.move_to(0, 0)
    
    if (not pause):
        lcd.putstr("\x02 Laeuft")
    else:
        lcd.putstr("\x01 Pause")
        
    lcd.move_to(0, 1)
    lcd.putstr("%dmin %ds" %(count // 60, count % 60))
        
def button_handler(pin):
    if (pin.value() == 1): # only if pressed, not on release
        if pin == buttonPause:
            button_handlerPause(pin)
        else:
            button_handlerReset(pin)
    
def button_handlerReset(pin):
    global count;
    count = 0;
    #print("Button (%s) changed to: %r" % (pin, pin.value()))
    

def button_handlerPause(pin):
    global pause
    pause = not pause
    #print("Button (%s) changed to: %r" % (pin, pin.value()))


buttonPause = Pin(12, Pin.IN, Pin.PULL_DOWN)
buttonPause.irq(trigger = machine.Pin.IRQ_RISING, handler = button_handler)

buttonReset = Pin(13, Pin.IN, Pin.PULL_DOWN)
buttonReset.irq(trigger = machine.Pin.IRQ_RISING, handler = button_handler)

try:
    if devices != []:
        lcd = I2CLcd(i2c, devices[0], 2, 16)
       
        # custom symbols
        symbolRun = [
            0b00000,
            0b01110,
            0b10101,
            0b10111,
            0b10001,
            0b01110,
            0b00000,
            0b00000
        ]
        lcd.custom_char(1, symbolRun)
        
        symbolSand = [
            0b11111,
            0b10001,
            0b10001,
            0b01010,
            0b00100,
            0b01110,
            0b11111,
            0b11111
        ]
        lcd.custom_char(2, symbolSand)

        timer.init(freq=1, mode=Timer.PERIODIC, callback=tick)
     
    else:
        print("No address found")
except:
    pass