from machine import Pin, SoftI2C
import time


i2c = SoftI2C(scl=Pin(22), sda=Pin(21))

pcf8574_address = 0x20  # Beispieladresse, ändern Sie dies entsprechend Ihrer Verdrahtung 

#i2c.writeto(PCF8575_ADDRESS, b'\xff')  # Hier wird das Byte 0x00 an den PCF8575 geschrieben (--> alles an)

#data = i2c.readfrom(PCF8575_ADDRESS, 1)  # Hier wird ein Byte von PCF8575 gelesen
# vorher müssen die Ports initialisiert werden i2c.writeto(PCF8575_ADDRESS, b'\xff')

# LED-Matrix Konfiguration (4x4)
rows = [0b00001111, 0b00001111, 0b00001111, 0b00001111]  # Reihen P0-P3
cols = [0b11110000, 0b11110000, 0b11110000, 0b11110000]  # Spalten P4-P7

def write_pcf8574(data):
    i2c.writeto(pcf8574_address, bytearray([data]))

def clear_matrix():
    write_pcf8574(0b11111111)  # Alle LEDs aus

def set_led(row, col, state):
    if state:
        # LED einschalten
        write_pcf8574(rows[row] & ~(1 << col))
    else:
        # LED ausschalten
        write_pcf8574(rows[row] | (1 << col))

def light_pattern():
    for i in range(4):
        for j in range(4):
            set_led(i, j, True)
            time.sleep(0.1)
            set_led(i, j, False)

while True:
    #i2c.writeto(pcf8574_address, b'\x10') # Oben links P0 =0 P4=1 ->  10 
    #i2c.writeto(pcf8574_address, b'\xFE') # Obere Reihe links P0 =0 P1-3=1    P4-P7=1 ->  FE 
  
    set_led(1,1,True)
    #light_pattern()