'''
 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, 1)

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

def display_bitmap(display, bitmap):
    # Loop through each row in the bitmap
    for y, row in enumerate(bitmap):
        # Loop through each bit in the row
        for x in range(8):
            # Check if the bit is set (1)
            if row & (1 << (7 - x)):
                # Set the pixel at the corresponding position
                display.pixel(x, y, 1)
            else:
                # Clear the pixel at the corresponding position
                display.pixel(x, y, 0)

    # Update the display
    display.show()



face_select_1 = [
    0b00000000,
    0b11100000,
    0b10100111,
    0b11100000,
    0b00000000,
    0b01000010,
    0b01111110,
    0b00000000,
]

face_idle_1 = [
    0b00000000,
    0b11100111,
    0b10100101,
    0b11100111,
    0b00000000,
    0b01000010,
    0b01111110,
    0b00000000,
]

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


reference_time = time.time()


while (time.time() - reference_time) <= 5:
    display_bitmap(display, face_select_1)

display_clear()