# imports
import machine
import math
import time
from machine import Pin,Timer,ADC

#######################################
# Pin and constant definitions
#######################################
seven_segment_pins = [Pin(x,Pin.OUT)for x in range(7)]
seven_segment_dp_pin = Pin(7,Pin.OUT)
seven_segment_digit_pins = [Pin(x,Pin.OUT) for x in range(8,12)]
adc_pin = machine.ADC(26)
button_pin = machine.Pin(16,machine.Pin.IN, machine.Pin.PULL_UP)
#######################################
# Global variables
debounce = 0
interrupt_flag = 0
seven_segment_timer = machine.Timer(-1)
#######################################
display_value = 0
seven_segment_values = [
    0b11000000,
    0b01111001,
    0b00100100,
    0b00110000,
    0b00011001,
    0b00010010,
    0b00000010,
    0b01111000,
    0b00000000,
    0b00010000,
]

#######################################
# Function definitions
#######################################

# Function to read the ADC pin and
# to convert the digital value to a voltage level in the 0-3.3V range
# This function updates the value of the display_value global variable
def read_analogue_voltage(pin):  # We can use the pin parameter if needed
    global display_value
    adc_value = adc_pin.read_u16()
    voltage = adc_value * (3.3 / ((2**16) -1))
    print("voltage",voltage)
    display_value = voltage



# Function to disable timer that triggers scanning 7 segment displays
def disable_display_timer():
    global seven_segment_timer
    seven_segment_timer.deinit()
    
    pass

# Function to enable timer that triggers scanning 7 segment displays

def enable_display_timer():
    global seven_segment_timer
    seven_segment_timer.init(mode=Timer.PERIODIC, period=30, callback=scan_display)
    pass

# Function to handle scanning 7 segment displays
# Display the value stored in the display_value global variable
# on available 7-segment displays
def scan_display(timer_int):
    value = display_value *1000
    for i in range (4):
        digit_value = value %10
        dp_enable = i == 3
        display_digit(digit_value,i,dp_enable)
        value = value // 10 

# Function display the given value on the display with the specified index
# dp_enable specifies if the decimal pooint should be on or off
def display_digit(digit_value, digit_index, dp_enable=False):
    digit_value = int(digit_value)
    for i in range(7):
        seven_segment_pins[i].value(seven_segment_values[digit_value] >> i & 1)
    if dp_enable:
        seven_segment_dp_pin.value(0)
    else: seven_segment_dp_pin.value(1)

    seven_segment_digit_pins[digit_index].value(1)
    time.sleep(0.001)
    seven_segment_digit_pins[digit_index].value(0)
    
        

# Function to test avaiable 7-segment displays
def display_value_test():
    global display_value
    while True:
        #display_value += 1
        read_analogue_voltage(26)
        time.sleep(1)
        

def interrupts(pin):
    global debounce , interrupt_flag

    button_press = time.ticks_ms() - debounce
    if button_press >50:
        interrupt_flag = 1
        debounce = time.ticks_ms()

button_pin.irq(trigger=Pin.IRQ_FALLING, handler=interrupts)        
# Function to setup GPIO/ADC pins, timers and interrupts
def setup():
    enable_display_timer()

def main():

    while True:
        global interrupt_flag
        if interrupt_flag == 1:
            interrupt_flag = 0 
            read_analogue_voltage(26)


if __name__ == '__main__':
    setup()
    main()