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added LED pixel code

commit b11e5f4bf484ee0738fd5a9ed85a6e307527b113 1 parent baf2204
raspberry@adafruit.com authored
Showing with 81 additions and 0 deletions.
  1. +81 −0 Adafruit_LEDpixels/Adafruit_LEDpixels.py
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81 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)
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