# This code will move the smiley across the 4 displays. The `display_smiley` function now takes a `position` parameter to determine which display should show the smiley. The `while` loop updates the position every second, making the smiley move from one display to the next.


from machine import Pin, SPI
from time import sleep

# Initialiseer SPI
spi = SPI(1, baudrate=1000000, polarity=0, phase=0, sck=Pin(18), mosi=Pin(23))
ss = Pin(5, Pin.OUT)
ss.value(1)

# MAX7221 registers
DECODE_MODE = 0x09
INTENSITY = 0x0A
SCAN_LIMIT = 0x0B
SHUTDOWN = 0x0C
DISPLAY_TEST = 0x0F

# Smiley patroon (8x8)
SMILEY = [
    0b00111100,  # Rij 1
    0b01000010,  # Rij 2
    0b10100101,  # Rij 3
    0b10000001,  # Rij 4
    0b10100101,  # Rij 5
    0b10011001,  # Rij 6
    0b01000010,  # Rij 7
    0b00111100   # Rij 8
]

def write_to_max7221(register, data, display):
    """Schrijf data naar een register van de MAX7221."""
    ss.value(0)
    spi.write(bytearray([register, data] * display))
    ss.value(1)

def setup_max7221():
    """Configureer de MAX7221 voor gebruik."""
    for display in range(4):
        write_to_max7221(SHUTDOWN, 0x01, display)  # Normale werking
        write_to_max7221(DISPLAY_TEST, 0x00, display)  # Display test uit
        write_to_max7221(DECODE_MODE, 0x00, display)  # Geen decodeermodus
        write_to_max7221(SCAN_LIMIT, 0x07, display)  # Gebruik alle 8 digits
        write_to_max7221(INTENSITY, 0x08, display)  # Helderheid (0x00 - 0x0F)

def display_smiley(position):
    """Toon een smiley op het dot-matrix display."""
    for row, data in enumerate(SMILEY, start=1):
        for display in range(4):
            if display == position:
                write_to_max7221(row, data, display)
            else:
                write_to_max7221(row, 0x00, display)

# Setup MAX7221 en toon smiley
setup_max7221()

position = 0
while True:
    display_smiley(position)
    position = (position + 1) % 4  # Verplaats de smiley naar de volgende display
    sleep(1)