Chapter 27 Solder Circuit Board
Finally, in a “for” cycle with i=64, modulate output pulse width of PWM square wave. And the progress, from
the beginning of implementing the for cycle to the end, is a PWM cycle. In the cycle, there is another for cycle
with j=8. And in this cycle, compare the cycle number “i” to the value of the array to determine output high
or low level. At last, the data will be sent to 74HC595.
for i in range( 0,64): #The cycle of PWM is 64 cycles
data = 0 #This loop of output data
for j in range(0,8): #Calculate the output state of this loop
if(i < pluseWidth[j+index]): #Calculate the LED state according to the
pulse width
data |= 1<<j #Calculate the data
outData(data) #Send the data to 74HC595
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