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from machine import UART, Pin, freq
from time import sleep, sleep_us
import network

p_zvd=Pin(32,Pin.IN)
p_scr=Pin(33,Pin.OUT)
p_tx=17
p_rx=16
delay=0

def pin_cb(p):
    global delay
    sleep_us(delay)
    p_scr.on()
    sleep_us(400)
    p_scr.off()

#enable max CPU frequency to avoid jittering
#freq(240000000)

#disable wifi to avoid jitter in IRQ
sta_if=network.WLAN(network.STA_IF)
ap_if=network.WLAN(network.AP_IF)
sta_if.active(False)
ap_if.active(False)

#setup irq callback
p_zvd.irq(trigger=Pin.IRQ_FALLING | Pin.IRQ_RISING, handler=pin_cb)

#setup UART
uart1=UART(1, baudrate=115200, tx=p_tx,rx=p_rx)

timeout=0

while True:
    try:
        consigne = uart1.readline()
    except e:
        print(e)
    if consigne == None:
        print('none')
        # setup a timeout
        # ensure full power if communication failed
        # to avoid cold water situation
        timeout+=1
        if timeout>=10:
            delay=0
    else:
        try:
            delay=int(consigne.decode('utf-8'))
        except:
            delay=0    
        print('{}'.format(delay))
        #reset timeout counter when communication resume
        timeout=0
    sleep(5)