from machine import Pin, I2C
import time

#time.sleep(0.1)
def BCD2Bin(num):
    auxd = num & 0xF0
    auxd = auxd >> 4
    auxu = num & 0x0F
    return auxd*10 + auxu

def Bin2BCD(num):
    auxd = num // 10
    auxd = auxd << 4
    auxu = num % 10
    return auxd | auxu

def readTime():
    resp = [0, 0, 0]
    info = i2c.readfrom_mem(104, 0, 3)
    for i in range(3):
        resp[i] = BCD2Bin(info[2-i])
    return resp

def writeTime(info):
    datos = [0, 0, 0]
    for i in range(3):
        datos[i] = Bin2BCD(info[2-i])
    i2c.writeto_mem(104, 0, bytearray(datos))

i2c = I2C(0, scl=Pin(17), sda=Pin(16), freq=100000)

hora = readTime()
print("Hora actual: ", hora)
writeTime([10, 20, 30])
hora = readTime()
print("Nueva hora: ", hora)