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pca9685pw.py
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import smbus
import time
import random
class Pca9685pw:
def __init__(self):
self.defaultBus = 0
self.bus = smbus.SMBus(self.defaultBus)
self.defaultAddress = 0b1000000
self.pca9685Mode1 = 0x0
self.pca9685Mode2 = 0x1
self.pca9685PreScale = 0xfe
self.pca9685OutDrv = 0x2
self.pca9685OutDrvOpenDrain = 0
self.pca9685OutDrvTotemPole = 1
self.ledBlockSize = 4
self.led0OnL = 6
self.led0OnH = 7
self.led0OffL = 8
self.led0OffH = 9
self.ledFull = 0x10 # bit4 used to set full On/Off
self.ledMaxOn = 4096-1.0 #0 based counter
def reset(self):
self.bus.write_byte_data(self.defaultAddress,self.pca9685Mode1, 0)
def prescaleFromFrequency(self,freq):
return int(round((25000000.0/(4096*freq))-1))
def readByteData(self,register):
return self.bus.read_byte_data(self.defaultAddress,register)
def writeByteData(self,register,value):
self.bus.write_byte_data(self.defaultAddress,register,value)
def setFrequency(self,freq):
prescalevalue = self.prescaleFromFrequency(freq)
oldmode = self.readByteData(self.pca9685Mode1)
newmode = oldmode&0x7f|0x10
self.writeByteData(self.pca9685Mode1,newmode)
self.writeByteData(self.pca9685PreScale,prescalevalue)
self.writeByteData(self.pca9685Mode1,oldmode)
time.sleep(0.005) #5 miliseconds
self.writeByteData(self.pca9685Mode1,(oldmode | 0x80)) #set restart bit (causes remembering where was when off)
def setTimes(self,ledNum,onTime,offTime):
print ledNum,onTime,offTime
ledOnL = self.led0OnL + self.ledBlockSize * ledNum
ledOnH = self.led0OnH + self.ledBlockSize * ledNum
ledOffL = self.led0OffL + self.ledBlockSize * ledNum
ledOffH = self.led0OffH + self.ledBlockSize * ledNum
onTimeL = onTime & 0xff
onTimeH = onTime >> 8
offTimeL = offTime & 0xff
offTimeH = offTime >> 8
#print ledOnL,ledOnH,ledOffL,ledOffH
#print onTimeL,onTimeH,offTimeL,offTimeH
self.writeByteData(ledOnL,onTimeL)
self.writeByteData(ledOnH,onTimeH)
self.writeByteData(ledOffL,offTimeL)
self.writeByteData(ledOffH,offTimeH)
def getTimes(self,ledNum):
ledOnL = self.led0OnL + self.ledBlockSize * ledNum
ledOnH = self.led0OnH + self.ledBlockSize * ledNum
ledOffL = self.led0OffL + self.ledBlockSize * ledNum
ledOffH = self.led0OffH + self.ledBlockSize * ledNum
onTimeL = self.readByteData(ledOnL)
onTimeH = self.readByteData(ledOnH)
offTimeL = self.readByteData(ledOffL)
offTimeH = self.readByteData(ledOffH)
#print ledOnL,ledOnH,ledOffL,ledOffH
#print onTimeL,onTimeH,offTimeL,offTimeH
print bin(onTimeL),bin(onTimeH),bin(offTimeL),bin(offTimeH)
def setFullOn(self,ledNum):
print 'On',ledNum
ledOnL = self.led0OnL + self.ledBlockSize * ledNum
ledOnH = self.led0OnH + self.ledBlockSize * ledNum
ledOffL = self.led0OffL + self.ledBlockSize * ledNum
ledOffH = self.led0OffH + self.ledBlockSize * ledNum
self.writeByteData(ledOnL,0)
self.writeByteData(ledOnH,self.ledFull)
self.writeByteData(ledOffL,0)
self.writeByteData(ledOffH,0)
def setFullOff(self,ledNum):
print 'Off',ledNum
ledOnL = self.led0OnL + self.ledBlockSize * ledNum
ledOnH = self.led0OnH + self.ledBlockSize * ledNum
ledOffL = self.led0OffL + self.ledBlockSize * ledNum
ledOffH = self.led0OffH + self.ledBlockSize * ledNum
self.writeByteData(ledOnL,0)
self.writeByteData(ledOnH,0)
self.writeByteData(ledOffL,0)
self.writeByteData(ledOffH,self.ledFull)
def setPercent(self,ledNum,percentOn):
print 'setPercent',ledNum,percentOn
timeOn = int((percentOn/100.0)*self.ledMaxOn)
if timeOn == 0:
return self.setFullOff(ledNum)
if timeOn == self.ledMaxOn:
return self.setFullOn(ledNum)
maxLeadIn = self.ledMaxOn - timeOn
start = 0 #random.randint(0,maxLeadIn)
stop = start+timeOn
self.setTimes(ledNum,start,stop)
def setColour(self,ledNum,red,green,blue):
print 'Colour: ',red,green,blue
self.setPercent(ledNum,(red/255.0*100))
self.setPercent(ledNum+1,(green/255.0*100))
self.setPercent(ledNum+2,(blue/255.0*100))
def getPercent(self,ledNum):
ledOnL = self.led0OnL + self.ledBlockSize * ledNum
ledOnH = self.led0OnH + self.ledBlockSize * ledNum
ledOffL = self.led0OffL + self.ledBlockSize * ledNum
ledOffH = self.led0OffH + self.ledBlockSize * ledNum
onTimeL = self.readByteData(ledOnL)
onTimeH = self.readByteData(ledOnH)
offTimeL = self.readByteData(ledOffL)
offTimeH = self.readByteData(ledOffH)
if (onTimeH == self.ledFull):
print 'getPercent',100
return 100
if (offTimeH == self.ledFull):
print 'getPercent',0
return 0
startOnTime = (onTimeH<<8) + onTimeL
startOffTime = (offTimeH<<8) + offTimeL
startTimeOn = startOffTime - startOnTime
percentOn = 100*(startTimeOn/self.ledMaxOn)
print 'getPercent',percentOn
return percentOn
def fadeToColour(self,ledNum,red,green,blue):
steps = 100
totalTime = 2.0
startRed = self.getPercent(ledNum)
startGreen = self.getPercent(ledNum+1)
startBlue = self.getPercent(ledNum+2)
endRed = (red/255.0*100)
endGreen = (green/255.0*100)
endBlue = (blue/255.0*100)
redDiff = endRed - startRed
greenDiff = endGreen - startGreen
blueDiff = endBlue - startBlue
print 'start',startRed,startGreen,startBlue
print 'end',endRed,endGreen,endBlue
for i in range(0,steps):
self.setPercent(ledNum,startRed+(redDiff/steps)*i)
self.setPercent(ledNum+1,startGreen+(greenDiff/steps)*i)
self.setPercent(ledNum+2,startBlue+(blueDiff/steps)*i)
time.sleep(totalTime/steps)
self.setColour(ledNum,red,green,blue)