LED_Matrix.py Source Code

The Python source code of LED_Matrix.py is provided for your reference.

'''
Please make sure the LED Dot Matrix is connected to the correct pins.
The following table describes how to connect LED Dot Matrix to the 40-pin header.
-----------------------------------------
___MAX7219_______Pin Number_____Pin Name
    VCC             2           5V Power
    GND             34           GND
    DIN             40          GPIO44
    CS              38          GPIO61
    CLK             36          GPIO36
----------------------------------------
'''

import VisionFive.gpio as GPIO
import sys
import time

DIN = 40
CS  = 38
CLK = 36
#Configure the direction of DIN, CS, and CLK as out.
GPIO.setup(DIN, GPIO.OUT)
GPIO.setup(CS, GPIO.OUT)
GPIO.setup(CLK, GPIO.OUT)

#Display logo data.
buffer = ['01111000', '01000000', '01111000', '01001111', '01111001', '00001111', '00000001', '00001111']

#LED turn off data.
buffer_off = ['0', '0', '0', '0', '0', '0', '0', '0']

def sendbyte(bytedata):
    for bit in range(0, 8):
        if ((bytedata << bit) & 0x80):
            GPIO.output(DIN, GPIO.HIGH)
        else:
            GPIO.output(DIN, GPIO.LOW)

        #Configure the voltage level of CLK as high.
        GPIO.output(CLK, GPIO.HIGH)
        #Configure the voltage level of CLK as low.
        GPIO.output(CLK, GPIO.LOW)


def WriteToReg(regaddr, bytedata):
    #Configure the voltage level of cs as high.
    GPIO.output(CS, GPIO.HIGH)
    #Configure the voltage level of led_pin as low.
    GPIO.output(CS,GPIO.LOW)
    GPIO.output(CLK, GPIO.LOW)
    sendbyte(regaddr)
    sendbyte(bytedata)
    GPIO.output(CS, GPIO.HIGH)

def WriteALLReg():
    time.sleep(0.1)
    for i in range(0, 8):
        #Write data to register address. Finally the LED matrix displays StarFive logo.
        WriteToReg(i+1, int(buffer[i], 2))
    time.sleep(5)

    #Display logo.
    for i in range(0, 10):
        for j in range(0, 8):
            #Write data to the register address. Finally turn off the LED matrix.
            WriteToReg(j+1, int(buffer_off[j], 2))
        time.sleep(0.1)
        for j in range(0, 8):
            #Write data to the register address. Finally the LED matrix displays with StarFive logo.
            WriteToReg(j+1, int(buffer[j], 2))
        time.sleep(0.1)

def initData():
    WriteToReg(0x09, 0x00) #Set the decode mode.
    WriteToReg(0x0a, 0x03) #Set the brightness.
    WriteToReg(0x0b, 0x07) #Set the scan limitation.
    WriteToReg(0x0c, 0x01) #Set the power mode.
    WriteToReg(0x0f, 0x00) 

def main():
    initData()
    while True:
        WriteALLReg()

if __name__ == "__main__":
    sys.exit(main())