from utime import sleep, ticks_ms
from machine import Pin, Timer

import util
from segment import SegmentDisplay

#######################################
# Pin and constant definitions
#######################################
BTN_ID = 16

DGT_START = 8
DGT_COUNT = 4 

SEG_START = 0
SEG_COUNT = 7

DOT_ID = 7

ADC_ID = 26

#######################################
# Global variables
#######################################
display_value = 0

last_btn_timestamp = 0

segment_display = None
adc_reader = None

def update_analogue_voltage():
    global display_value

    readings = []

    for _ in range(16): # read 16 times
        readings.append(adc_reader.read_voltage())
    
    display_value = round(sum(readings) / len(readings), 4) # average
    print(f"Voltage: {display_value*1000} mV")


def scan_display(timer_id):
    segment_display.scan(display_value)


def btn_interrupt(pin):
    global last_btn_timestamp

    timestamp = ticks_ms()

    if timestamp - last_btn_timestamp > 200:
        update_analogue_voltage()
        last_btn_timestamp = timestamp
    
        # print(f"Temp: {adc_reader.read_temp()}°C")
        # Try uncommenting the above line


def setup():
    global segment_display
    global adc_reader

    print("Starting...")

    adc_reader = util.ADCReader(ADC_ID)

    segment_display = SegmentDisplay(
        digits = util.init_pins(DGT_START, DGT_COUNT, mode=Pin.OUT),
        segments = util.init_pins(SEG_START, SEG_COUNT, reverse=True, mode=Pin.OUT),
        dot = Pin(DOT_ID, mode=Pin.OUT)
    )

    btn = Pin(BTN_ID, Pin.IN, Pin.PULL_DOWN)
    btn.irq(handler=btn_interrupt, trigger=Pin.IRQ_FALLING)

    display_timer = Timer()
    display_timer.init(mode=Timer.PERIODIC, period=100, callback=scan_display)



if __name__ == '__main__':
    setup()