gistfile1.txt

#!/usr/bin/env python

# Test code for Adafruit LED Pixels, uses hardware SPI

import RPi.GPIO as GPIO, time, os

DEBUG = 1
GPIO.setmode(GPIO.BCM)


def slowspiwrite(clockpin, datapin, byteout):
    GPIO.setup(clockpin, GPIO.OUT)
    GPIO.setup(datapin, GPIO.OUT)
    for i in range(8):
        if (byteout & 0x80):
            GPIO.output(datapin, True)
        else:
            GPIO.output(clockpin, False)
        byteout <<= 1
        GPIO.output(clockpin, True)
        GPIO.output(clockpin, False)


SPICLK = 18
SPIDO = 17

NUMPIXELS = 100

ledpixels = [0] * NUMPIXELS
kitstate = [0] * NUMPIXELS
FADESPEED = 16


def writestrip(pixels):
    spidev = file("/dev/spidev0.0", "w")
    for i in range(len(pixels)):
        spidev.write(chr((pixels[i] >> 16) & 0xFF))
        spidev.write(chr((pixels[i] >> 8) & 0xFF))
        spidev.write(chr(pixels[i] & 0xFF))
    spidev.close()
    time.sleep(0.002)


def Color(r, g, b):
    return ((r & 0xFF) << 16) | ((g & 0xFF) << 8) | (b & 0xFF)


def setpixelcolor(pixels, n, c):
    if (n >= len(pixels)):
        return
    pixels[n] = c


def colorwipe(pixels, c, delay):
    for i in range(len(pixels)):
        setpixelcolor(pixels, i, c)
        writestrip(pixels)
        time.sleep(delay)


def Wheel(WheelPos):
    if (WheelPos < 85):
        return Color(WheelPos * 3, 255 - WheelPos * 3, 0)
    elif (WheelPos < 170):
        WheelPos -= 85;
        return Color(255 - WheelPos * 3, 0, WheelPos * 3)
    else:
        WheelPos -= 170;
        return Color(0, WheelPos * 3, 255 - WheelPos * 3)

def kit(pixels, wait):
    vector = 1
    pos = 0
    while True:
        # Dim all pixels
        for i in range(NUMPIXELS):
            if kitstate[i] > FADESPEED:
                kitstate[i] -= FADESPEED
            else:
                kitstate[i] = 0
            setpixelcolor(pixels, i, Color(kitstate[i],0,0))
            
        # Light up new one
        pos += vector
        if pos > NUMPIXELS:
            vector = -1
            pos = NUMPIXELS-1
        if pos < 0:
            vector = 1
            pos = 1
        setpixelcolor(pixels, pos, Color(255,0,0))
        kitstate[pos] = 255
        
        writestrip(pixels)
        time.sleep(wait)

colorwipe(ledpixels, Color(255, 0, 0), 0.05)
colorwipe(ledpixels, Color(0, 255, 0), 0.05)
colorwipe(ledpixels, Color(0, 0, 255), 0.05)
while True:
    kit(ledpixels, 0.05)