added LED pixel code

Author: raspberry@adafruit.com

Adafruit_LEDpixels/Adafruit_LEDpixels.py

@@ -0,0 +1,81 @@
+#!/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
+
+ledpixels = [0] * 25
+
+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, r, g, b):
+	if (n >= len(pixels)):
+		return
+	pixels[n] = Color(r,g,b)
+
+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 rainbowCycle(pixels, wait):
+	for j in range(256): # one cycle of all 256 colors in the wheel
+    	   for i in range(len(pixels)):
+# tricky math! we use each pixel as a fraction of the full 96-color wheel
+# (thats the i / strip.numPixels() part)
+# Then add in j which makes the colors go around per pixel
+# the % 96 is to make the wheel cycle around
+      		setpixelcolor(pixels, i, Wheel( ((i * 256 / len(pixels)) + j) % 256) )
+	   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:
+	rainbowCycle(ledpixels, 0.00)