Freenove Ultimate Starter Kit User Manual

Chapter 19 74HC595 & LED Matrix
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def shiftOut(dPin,cPin,order,val):
for i in range(0,8):
GPIO.output(cPin,GPIO.LOW);
if(order == LSBFIRST):
GPIO.output(dPin,(0x01&(val>>i)==0x01) and GPIO.HIGH or GPIO.LOW)
elif(order == MSBFIRST):
GPIO.output(dPin,(0x80&(val<<i)==0x80) and GPIO.HIGH or GPIO.LOW)
GPIO.output(cPin,GPIO.HIGH);
def loop():
w hile Tr ue:
for j in range(0,500):# Repeat enough times to display the smiling face a period
of time
x=0x80
for i in range(0,8):
GPIO. output(latchPin,GPIO.LOW)
shiftOut(dataPin,clockPin,MSBFIRST,pic[i]) #first shift data of line
information to first stage 74HC959
shiftOut(dataPin,clockPin,MSBFIRST,~x) #then shift data of column
information to second stage 74HC959
GPIO. output(latchPin,GPIO.HIGH)# Output data of two stage 74HC595 at the
same time
time. sleep(0.001)# display the next column
x>>=1
for k in range(0,len(data)-8):#len(data) total number of "0-F" columns
for j in range(0,20):# times of repeated displaying LEDMatrix in every frame,
the bigger the "j", the longer the display time.
x= 0x80 # Set the column information to start from the first column
f or i in range(k,k+8):
GPIO. output(latchPin,GPIO.LOW)
shiftOut(dataPin,clockPin,MSBFIRST,data[i])
shiftOut(dataPin,clockPin,MSBFIRST,~x)
GPIO. output(latchPin,GPIO.HIGH)
time. sleep(0.001)
x>>=1
def destroy(): # When 'Ctrl+C' is pressed, the function is executed.
GPIO. cleanup()
if __name__ == '__main__': # Program starting from here
p rint ('Program is starting...' )
setup()
try:
loop()

Freenove Ultimate Starter Kit Specifications

General

Brand	Freenove
Model	Ultimate Starter Kit
Category	Single board computers
Language	English