#! /usr/bin/env python

from serial import serialposix as ser
import time
import math
import random


serport = ser.Serial ( port='/dev/ttyACM0', baudrate=115200 )
time.sleep ( 1 ) # wait for the Arduino bootloader to quit

def linear ( val ):	return max ( 0, min ( 127, int ( 127 * val**2 ) ) )
def picfunc ( pix, t ): return picfunc_xyz ( pix % 4, (pix / 4) % 4, (pix / 16) % 4, t )

def picfunc_xyz ( x, y, z, t ):
	return linear ( math.sin ( 2 * t + (x + y + z)/3. ) ** 2 )


t = 0.0
try:
	while True:
		time.sleep ( 0.01 )
		t += 0.01
		serport.write ( chr ( 255 ) + ''.join ( map ( chr, [linear ( random.random ( ) ** 256 ) for x in range ( 64 )] ) ) )
except KeyboardInterrupt:
	serport.write ( chr ( 255 ) + ''.join ( map ( chr, [0 for x in range ( 64 )] ) ) )
	serport.close ( )