'''
 Demonstrates the use of MAX7219, Scrolling display.
 
 * Demonstrate to display the scrolling display.
 * Four numbers of the MAX7219 are connected in daisy chain.
 * 8x8 dot matrix module, (64 LEDs) is connected with each MAX7219
 * totally 8x8x4 = 256 LEDs forming with 8 rows of 32 columns Display area.
 
 * The Raspberry Pi Pico pin connections are MAX7219 given below:

 * MAX7219 VCC pin to VBUS
 * MAX7219 GND pin to GND
 * MAX7219 DIN pin to digital GPIO3
 * MAX7219 CS pin to digital GPIO5
 * MAX7219 CLOCK pin to digital GPIO2

 Name:- M.Pugazhendi
 Date:-  10thJul2021
 Version:- V0.1
 e-mail:- [email protected]
'''

# Import MicroPython libraries of PIN and SPI
from machine import Pin, SPI
from time import sleep

# Import MicoPython max7219 library
import max7219


#Intialize the SPI
spi = SPI(0, baudrate=10000000, polarity=1, phase=0, sck=Pin(2), mosi=Pin(3))
ss = Pin(5, Pin.OUT)

# Create matrix display instant, which has 1 MAX7219 devices.
display = max7219.Matrix8x8(spi, ss, 1)

#Set the display brightness. Value is 1 to 15.
display.brightness(1)

pattern = [
    0b10000000,
    0b01100000,
    0b10000001,
    0b00000000,
    0b00000000,
    0b00000000,
    0b00000000,
    0b00000000
]

# Function to display the pattern on the LED matrix
def show_pattern(pattern):
    for y in range(8):
        for x in range(8):
            pixel = (pattern[y] >> (7 - x)) & 1
            display.pixel(x, y, pixel)
    display.show()

# Clear the display
display.fill(0)
display.show()

# Show the pattern
show_pattern(pattern)

# Keep the pattern displayed
while True:
    sleep(1)