'''
 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

# Import MicoPython max7219 library
import max7219

# Import time
import time

#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 four MAX7219 devices.
display = max7219.Matrix8x8(spi, ss, 4)

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

#Define the scrolling message
scrolling_message = "test"

#Get the message length
length = len(scrolling_message)

#Calculate number of columns of the message
column = (length * 8)

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

#sleep for one one seconds
#time.sleep(1)

# Initial positions of LEDs
led1PosX, led1PosY = 0, 0
led2PosX, led2PosY = 1, 0


def set_led(x, y):
    display.pixel(x, y, 1)

def clear_display():
    display.fill(0)
    display.show()


# Unconditionally execute the loop
while True:
      
    clear_display()
    set_led(led1PosX, led1PosY)
    set_led(led2PosX, led2PosY)
    display.show()
    time.sleep(0.2)

    # Move LEDs
    led1PosX += 1
    led2PosX += 1

    # Check if LEDs need to move to the next row
    if led1PosX == 8 and led1PosY < 8:
        led1PosX = 0
        led1PosY += 1
    if led2PosX == 8 and led2PosY < 8:
        led2PosX = 0
        led2PosY += 1

    # Check if LEDs need to jump to the next section
    if led1PosY == 8:
        led1PosX = 8
        led1PosY = 0
    if led2PosY == 8:
        led2PosX = 8
        led2PosY = 0

    # Wrap around if necessary
    if led1PosX == 16 and led1PosY < 8:
        led1PosX = 8
        led1PosY += 1
    if led2PosX == 16 and led2PosY < 8:
        led2PosX = 8
        led2PosY += 1

    # Ensure LEDs stay within bounds
    if led1PosY == 8:
        led1PosY = 0
    if led2PosY == 8:
        led2PosY = 0

    # Restart pattern after reaching the end
    if led1PosX == 14 and led1PosY == 7 and led2PosX == 15 and led2PosY == 7:
        clear_display()
        set_led(led1PosX, led1PosY)
        set_led(led2PosX, led2PosY)
        display.show()
        time.sleep(0.2)

        led1PosX, led1PosY = 0, 0
        led2PosX, led2PosY = 1, 0
        print("Restart")