+class LPD8806:
+ def __init__(self, bus, device, num_leds):
+ self.spi = spidev.SpiDev()
+ self.spi.open(bus, device)
+ self.spi.mode=0b00
+ self.spi.max_speed_hz=int(2e6)
+ self.num_leds = num_leds
+ self.latch()
+ self.l = [(0, 0, 0)] * num_leds
+ self.update()
+
+ def set(self, i, red=0, green=0, blue=0):
+ if red > 127 or green > 127 or blue >> 127 or red < 0 or green < 0 or blue < 0:
+ raise Exception("Bad RGB Value")
+ self.l[i] = (red, green, blue)
+
+ def latch(self):
+ self.spi.writebytes([0x0 for i in range((self.num_leds+31)/32)])
+
+ def update(self):
+ l = []
+ for i in range(self.num_leds):
+ red, green, blue = self.l[i]
+ l.append(0x80 | green)
+ l.append(0x80 | red)
+ l.append(0x80 | blue)
+ self.spi.writebytes(l)
+ self.latch()
+