#!/usr/bin/python

import os,time,sys,math

rmbl = 0

def send(cmd,rid,data):
        x=""
        for i in [cmd,rid]+data:
                x = x + chr(i)
        x=chr((len(data)+2))+x

        hid = open("/tmp/hid","w")
        hid.write(x)
        hid.flush()
        hid.close()

CMD_SET_REPORT = 0x52

RID_LEDS = 0x11

def setleds(p1,p2,p3,p4):
        aux = 0
        if p1:
                aux |= 0x10
        if p2:
                aux |= 0x20
        if p3:
                aux |= 0x40
        if p4:
                aux |= 0x80
        if rmbl:
                aux |= 0x01
        send(CMD_SET_REPORT,RID_LEDS,[aux])

DL_MAX = 20

dl_acc = 0

setleds(0,0,0,0)
time.sleep(2)

def deltasigma_leds(brightness):
        global dl_acc
        dl_acc += brightness
        if dl_acc >= DL_MAX:
                dl_acc -= DL_MAX
                setleds(1,1,1,1)
        else:
                setleds(0,0,0,0)


for i in range(20000):
        v = (math.sin((i/400.0)-math.pi/2)+1)*(DL_MAX-1)/2
        deltasigma_leds(v)