import max7219
from machine import Pin, SPI
import time

NUM_DEVICES = 4
CS_PIN = 4

spi = SPI(
    2,
    baudrate=10_000_000,
    polarity=0,
    phase=0,
    sck=Pin(18),
    mosi=Pin(23)
)

cs = Pin(CS_PIN, Pin.OUT)

display = max7219.Matrix8x8(spi, cs, NUM_DEVICES)
display.brightness(5)

DISPLAY_WIDTH = NUM_DEVICES * 8

def scroll_text(text, delay=0.06):
    text_width = len(text) * 8
    for x in range(DISPLAY_WIDTH, -text_width, -1):
        display.fill(0)
        display.text(text,x, 0, 1)
        display.show()
        time.sleep(delay)

while True:
    scroll_text("HELLO")
    time.sleep(1)