from machine import Pin,I2C,Timer
import time
from pico_i2c_lcd import I2cLcd

sda=Pin(0)
scl = Pin(1)

i2c = I2C(0, sda=sda , scl=scl ,freq = 400000)

devices = i2c.scan()

if len(devices)<=0:
    print("No devices found!")
else :
    print(hex(devices[0]))

i2c_addr = devices[0]
lcd=I2cLcd(i2c,i2c_addr,2,16)

R1 = [Pin(i+2,Pin.OUT) for i in range(4)]
R2 = [Pin(i+10,Pin.OUT) for i in range(4)]
R3 = [Pin(i+18,Pin.OUT) for i in range(4)]
carry = Pin(22,Pin.OUT)
for led in R1:
  led.low()
for led in R2:
  led.low()
for led in R3:
  led.low()
carry.low()
n=4


def fn(timer) :
  for i in range(2**n):
    for j in range(2**n):
      k=0
      delay=0.25
      a=bin(i)[2:]
      b=bin(j)[2:]
      c=bin(i+j)[2:]
      ex=0
      s=""
      while(ex+len(a)<4):
        s=s+"0"
        ex=ex+1
      s=s+a
      a=s
      ex=0
      s=""
      while(ex+len(b)<4):
        s=s+"0"
        ex=ex+1
      s=s+b
      b=s
      if len(c)>4:
        carry.high()
        delay=2
        k=1
      else:
        carry.low()
        delay=0.25
        ex=0
        s=""
        while(ex+len(c)<4):
          s=s+"0"
          ex=ex+1
        s=s+c
        c=s
      for p in range(n):
        R1[p].value(int(a[p]))
        R2[p].value(int(b[p]))
        R3[p].value(int(c[p+k]))
      lcd.putstr(f"{a}+{b}={c}")
      time.sleep(delay)
      lcd.clear()
t = Timer(period = 1000,mode = Timer.PERIODIC,callback = fn)