from machine import Pin, SPI
import max7219
import gc
from utime import sleep
spi = SPI(1, 10_000_000, sck=Pin(14), mosi=Pin(15), miso=Pin(12))
screen = max7219.Max7219(32, 8, spi, Pin(9))


def zfl(s, width):
# Pads the provided string with leading 0's to suit the specified 'chrs' length
# Force # characters, fill with leading 0's
  return '{:0>{w}}'.format(s, w=width)

def scroll_text(s,timing):
  length = len(s)    
  column = (length * 8) #Calculate number of columns of the message
  for i in range(32,-column,-1):
    screen.fill(0)   
    screen.text(s,i,1,1)            
    screen.show()          
    sleep(timing)



while 1:
    #Define the scrolling message
    msg = "RASPBERRY PI PICO AND MAX7219 -- 8x8 DOT MATRIX SCROLLING DISPLAY"
    scroll_text(msg,0.01)
    gc.collect()