from machine import Pin
from esp32_gpio_lcd import GpioLcd
from time import sleep

lcd = GpioLcd(rs_pin=Pin(4),
                  enable_pin=Pin(17),
                  d4_pin=Pin(5),
                  d5_pin=Pin(18),
                  d6_pin=Pin(21),
                  d7_pin=Pin(22),
                  num_lines=2, num_columns=20)

Key_up   = const(0)
Key_down = const(1)

key = [['1', '2', '3', 'A'], ['4', '5', '6', 'B'], ['7', '8', '9', 'C'], ['*', '0', '#', 'D']]

# Dinh nghia chan
rows = [2,4,5,19] 
colums = [12,27,26,25] 

# Dinh nghia chan hang
pin_rows = [Pin(pin_name, mode=Pin.OUT) for pin_name in rows]

# dinh nghia chan cot
pin_colums = [Pin(pin_name, mode=Pin.IN, pull=Pin.PULL_DOWN) for pin_name in colums]

#khoi tao keypad

def initialization():
    """khoi tao"""
    for row in range(0,4):
        for col in range(0,4):
            pin_rows[row].value(0)

def scan(row, column):
    """ quet phim """

    # dung cac phim len muc 1
    pin_rows[row].value(1)
    key = None

    # xac thuc khi nhan phim
    if pin_colums [column].value() == Key_down:
        key = Key_down
    if pin_colums [column].value() == Key_up:
        key = Key_up
    pin_rows [row].value(0)
    return key
    
# dua cac phim ve muc 0
initialization()
lcd.putstr("An phim: ")
while True:
   
    for row in range(4):
        for column in range(4):
            keypad = scan(row, column)
            if keypad == Key_down:
                lcd.putstr(str(key[row][column]))
                last_key_press = key[row][column]
                sleep(0.5)