Freenove Ultimate Starter Kit, Руководство пользователя

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217 Chapter 19 74HC595 & LED Matrix █ www.freenove.com
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Python Code 19.1.1 LEDMatrix
First observe the project result, and then analyze the code.
1.
Use cd command to enter 19.1.1_LEDMatrix directory of Python language.
cd ~/Freenove_Ultimate_Starter_Kit_for_Raspberry_Pi/Code/Python_Code/19.1.1_LEDMatrix
2. Use python command to execute python code “LEDMatrix.py”.
python LEDMatrix.py
After the program is executed, LEDMatrix will display a smiling face, and then the display scrolling character
"0-F", circularly.
The following is the program code:
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i m port RPi . GPIO a s GPIO
i m port time
LSBFIRST = 1
MSBFIRST = 2
#define the pins connect to 74HC595
dataPin = 11 #DS Pin of 74HC595(Pin14)
latchPin = 13 #ST_CP Pin of 74HC595(Pin12)
clockPin = 15 #SH_CP Pin of 74HC595(Pin11)
pic = [ 0x1c , 0x22 , 0x51 , 0x45 , 0x45 , 0x51 , 0x22 , 0x1c ] # data of smiling face
data = [ #data of "0-F"
0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , # " "
0x00 , 0x00 , 0x3E , 0x41 , 0x41 , 0x3E , 0x00 , 0x00 , # "0"
0x00 , 0x00 , 0x21 , 0x7F , 0x01 , 0x00 , 0x00 , 0x00 , # "1"
0x00 , 0x00 , 0x23 , 0x45 , 0x49 , 0x31 , 0x00 , 0x00 , # "2"
0x00 , 0x00 , 0x22 , 0x49 , 0x49 , 0x36 , 0x00 , 0x00 , # "3"
0x00 , 0x00 , 0x0E , 0x32 , 0x7F , 0x02 , 0x00 , 0x00 , # "4"
0x00 , 0x00 , 0x79 , 0x49 , 0x49 , 0x46 , 0x00 , 0x00 , # "5"
0x00 , 0x00 , 0x3E , 0x49 , 0x49 , 0x26 , 0x00 , 0x00 , # "6"
0x00 , 0x00 , 0x60 , 0x47 , 0x48 , 0x70 , 0x00 , 0x00 , # "7"
0x00 , 0x00 , 0x36 , 0x49 , 0x49 , 0x36 , 0x00 , 0x00 , # "8"
0x00 , 0x00 , 0x32 , 0x49 , 0x49 , 0x3E , 0x00 , 0x00 , # "9"
0x00 , 0x00 , 0x3F , 0x44 , 0x44 , 0x3F , 0x00 , 0x00 , # "A"
0x00 , 0x00 , 0x7F , 0x49 , 0x49 , 0x36 , 0x00 , 0x00 , # "B"
0x00 , 0x00 , 0x3E , 0x41 , 0x41 , 0x22 , 0x00 , 0x00 , # "C"
0x00 , 0x00 , 0x7F , 0x41 , 0x41 , 0x3E , 0x00 , 0x00 , # "D"
0x00 , 0x00 , 0x7F , 0x49 , 0x49 , 0x41 , 0x00 , 0x00 , # "E"
0x00 , 0x00 , 0x7F , 0x48 , 0x48 , 0x40 , 0x00 , 0x00 , # "F"
0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00 , # " "
]
d e f setup ( ):
GPIO . setmode ( GPIO . BOARD ) # Number GPIOs by its physical location
GPIO . setup ( dataPin , GPIO . OUT )
GPIO . setup ( latchPin , GPIO . OUT )
GPIO . setup ( clockPin , GPIO . OUT )