int main( void )
{
// Stop watchdog timer to prevent time out reset
WDTCTL = WDTPW + WDTHOLD;
init();
UCA0CTL1 &= ~UCSWRST;
accelinit();
while(1)
{
readaccel();
UCA0TXBUF=msbyte;
while(UCA0STAT&0x01);
for(i=0;i<200;i++);// delay for a little bit before reading again
}
}
int main(void)
{
//LEDs
uint16_t hue = 0, brightness = BRI_LIMIT - 1, lastBrightness = brightness;
//motion
int16_t oldaccel[3], rawoldaccel[3], accel[3] = {0}, rawaccel[3] = {0};
int32_t dotp[3];
double flt_div, flt_acos;
int8_t int_acos;
//microphone
uint32_t histPower[HIST_SIZE] = {0}, histPowerIndex = 0;
uint32_t currentPower, avgPower = 0;
double scale;
//idle
uint16_t idleIters = 0, idleActivity = 0;
uint8_t idleMinutes = 0;
// Initialize io ports
ioinit();
// Initialize serial
serialinit();
stdout = &mystdout;
// print banner/battery check
banner();
// Initialize the timer
timerinit();
// Initialize audio capture
audioinit();
// Initialize accelerometer
accelinit();
// Enable interrupts
sei();
while(1)
{
// Wait until audio sample is ready
while(!curAudioPowerReady) {}
curAudioPowerReady = 0;
// Grab the current audio power
currentPower = curAudioPower;
//Read accelerometer, determine hue
oldaccel[0] = accel[0]; oldaccel[1] = accel[1]; oldaccel[2] = accel[2];
rawoldaccel[0] = rawaccel[0]; rawoldaccel[1] = rawaccel[1]; rawoldaccel[2] = rawaccel[2];
adxl345_getxyz(&rawaccel[0], &rawaccel[1], &rawaccel[2]);
//(lowpass filter the accelerometer data)
accel[0] = (rawoldaccel[0] + rawaccel[0]) / 2;
accel[1] = (rawoldaccel[1] + rawaccel[1]) / 2;
accel[2] = (rawoldaccel[2] + rawaccel[2]) / 2;
//theta = acos(a.b / |a||b|)
dotp[0] = accel[0] * oldaccel[0] + accel[1] * oldaccel[1] + accel[2] * oldaccel[2];
dotp[1] = accel[0] * accel[0] + accel[1] * accel[1] + accel[2] * accel[2];
dotp[2] = oldaccel[0] * oldaccel[0] + oldaccel[1] * oldaccel[1] + oldaccel[2] * oldaccel[2];
if(dotp[1] == 0) dotp[1] = 1;
if(dotp[2] == 0) dotp[2] = 1;
flt_div = dotp[0] / (sqrt(dotp[1]) * sqrt(dotp[2]));
flt_acos = acos(flt_div);
int_acos = (int8_t)(flt_acos * 180 / M_PI);
//the amount of motion varies pretty widely; it seems like the best
//aesthetic results are from motion-triggering
if(int_acos > 15)
{
hue += 15;
idleActivity++;
}
if(hue >= HUE_LIMIT) hue -= HUE_LIMIT;
//determine intensity (sliding scale)
avgPower -= histPower[histPowerIndex];
histPower[histPowerIndex] = currentPower;
avgPower += histPower[histPowerIndex];
histPowerIndex++;
if(histPowerIndex >= HIST_SIZE) histPowerIndex = 0;
//scale should vary between 0.5ish and 1.5ish... clamp to [0,1]
scale = (float)(currentPower * HIST_SIZE) / avgPower;
scale -= 0.5;
if(scale > 1.0) scale = 1.0;
if(scale < 0.0) scale = 0.0;
//perception mapping: y=x^4 to give it a concave shape
scale = scale*scale*scale*scale;
brightness = BRI_MIN + (BRI_MAX-BRI_MIN) * scale;
if(brightness < lastBrightness)
brightness = (brightness + lastBrightness) / 2;
lastBrightness = brightness;
//Update LED colors
send_hsb(hue, SATURATION, brightness);
//Handle console
dispatch_console();
// Idle check
idleIters++;
if(idleIters >= ITERS_PER_MINUTE) {
if(idleActivity >= IDLE_ACTIVITY_THRESHOLD) {
// Activity!!! Reset idle minutes
idleMinutes = 0;
} else {
// Not enough activity, mark minute as idle
idleMinutes++;
}
// Shutdown if idle for too long
if(idleMinutes >= IDLE_MINUTES_UNTIL_SHUTDOWN) {
shutdown(0);
}
// Reset iteration counts
idleIters = 0;
idleActivity = 0;
}
// Idle backstop check
if(get_ticks() >= MINUTES_UNTIL_SHUTDOWN * 60) {
shutdown(0);
}
}
}
