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TLC5940.py
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TLC5940.py
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#!/usr/bin/python
import RPi.GPIO as GPIO
#import spidev
import spi
import time
from threading import Thread
XLAT=4
VPRG=17
BLANK=23
GSCLK=18
# setup rpi.gpio pins
GPIO.setmode(GPIO.BCM)
GPIO.setup(XLAT, GPIO.OUT)
GPIO.setup(VPRG, GPIO.OUT)
GPIO.setup(BLANK, GPIO.OUT)
GPIO.setup(GSCLK, GPIO.OUT)
# setup serial
#spi = spidev.SpiDev()
#spi.open(0,0)
spi.openSPI(speed=25000)
#constants
# VPRG settings for registers
regDC=1
regPWM=0
def runGSCLK():
i=0
while(1):
i+=1
if i>=1096:
print "reset"
GPIO.output(BLANK,1)
GPIO.output(BLANK,0)
i=0
else:
GPIO.output(GSCLK,1)
GPIO.output(GSCLK,0)
def buildvalue(values, register):
# need to convert values in port order (0->16) into byte order MSB first (16->0)
bitstream=[]
out=[]
if register==regDC:
reglength=6
elif register==regPWM:
reglength=12
else:
print "error unrecognised register"
return []
# for every element in array
for output in range(len(values)):
#print str(output) + " = " + str(values[output])
#print bin(values[output])[2:].zfill(reglength)
#print reglength
for char in bin(values[output])[2:].zfill(reglength)[::-1]:
if char=="1":
bitstream.append(1)
elif char =="0":
bitstream.append(0)
#print bitstream
#print bitstream[::-1]
for bitoffset in range(0,len(bitstream),8):
outbyte=0
for bit in range(8):
if bitstream[::-1][bitoffset+bit]==1:
outbyte+=2**(7-bit)
#print outbyte
out.append(outbyte)
#print out
return out
def setTLCvalue(data,DCMode):
# put the chip into DC mode
GPIO.output(VPRG, DCMode)
#print tuple(data)
spi.transfer(tuple(data))
# latch data
GPIO.output(XLAT, GPIO.HIGH)
#time.sleep(0.25)
GPIO.output(XLAT, GPIO.LOW)
GPIO.output(VPRG, GPIO.LOW)
def resetTLC():
# resets the chip to its default state
setTLCvalue([255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255],regPWM)
setTLCvalue(buildvalue([33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33,33],regDC),regDC)
if __name__ == "__main__":
resetTLC()
import math
for id in range(0, 16*5, 1):
val = [0]*id + [4000] + [0]*(16*5 - id - 1)
print val
setTLCvalue(buildvalue(val, regPWM), regPWM)
time.sleep(5)
exit()
# i=0
# for val in range(0,4096,100):
# print val
# red=val
# green=val
# blue=val
# setTLCvalue(buildvalue([red,green,blue,red,green,blue,red,green,blue,red,green,blue,red,green,blue,0,red,green,blue,red,green,blue,red,green,blue,red,green,blue,red,green,blue,0,red,green,blue,red,green,blue,red,green,blue,red,green,blue,red,green,blue,0],regPWM),regPWM)
# time.sleep(0.5)
# exit()
# for val in range(4096):
# print val
# setTLCvalue(buildvalue([0,0,val,0,0,val,0,0,val,0,0,val,0,0,val,0,0,0,val,0,0,val,0,0,val,0,0,val,0,0,val,0,0,0,val,0,0,val,0,0,val,0,0,val,0,0,val,0],regPWM),regPWM)
# time.sleep(0.01)
#
# # pulsate by changeing brightness
# while(1):
# val = int(4000*(math.sin(float(i))+1)/2)
# i+=0.01
# print val
# red=val
# green=val
# blue=val
# setTLCvalue(buildvalue([red,green,blue,red,green,blue,red,green,blue,red,green,blue,red,green,blue,0,red,green,blue,red,green,blue,red,green,blue,red,green,blue,red,green,blue,0,red,green,blue,red,green,blue,red,green,blue,red,green,blue,red,green,blue,0],regPWM),regPWM)
# time.sleep(0.01)