random colors

/*
 * lights.c
 *
 * Created: 6/14/2013 11:30:35 PM
 *  Author: dtudury
 */ 

#ifndef F_CPU
#define F_CPU 1000000UL // or whatever may be your frequency
#endif


#include <avr/io.h>
#include <util/delay.h>


static uint16_t meters = 5;
static uint16_t ledsPerMeter = 32;
static uint16_t numLEDs = 5 * 32;
int *pixels;

int main(void)
{
  InitADC();
	
	DDRC = 0b00000011;
	
	pixels = (int *)malloc(numLEDs * 3);
	uint16_t i;

	
    while(1)
    {
		
		for(i=0; i<numLEDs; i++) {
			pixels[i * 3] += ReadADC(3) + 29 * i;// + ReadADC(1) + ReadADC(2) + ReadADC(3) + ReadADC(4) + ReadADC(5);
			pixels[i * 3 + 1] += ReadADC(4) + 33 * i;// + ReadADC(1) + ReadADC(2) + ReadADC(3) + ReadADC(4) + ReadADC(5);
			pixels[i * 3 + 2] += ReadADC(5) + 31 * i;// + ReadADC(1) + ReadADC(2) + ReadADC(3) + ReadADC(4) + ReadADC(5);
		}
		show();
    }
}
uint8_t map(uint8_t v) {
	return v % 127 | 0b10000000;
}
void show(uint16_t r, uint16_t g, uint16_t b) {
	uint16_t i;
	
	write8(0);
	write8(0);
	write8(0);
	write8(0);

	for (i=0; i<numLEDs*3; i++ ) {
		write8(map(pixels[i]));
	}
	for (i=0; i<meters; i++ ) {
		write8(0);
	}
//	_delay_ms(100);
}

void write8(uint8_t d) {
	for (uint8_t i=0; i<8; i++) {
		writeBit(d & _BV(7-i));
	}
}

void writeBit(uint8_t on) {
	if (on) PORTC = 0b00000010;
	else PORTC = 0b00000000;
		
	//toggle clock
	PORTC = 0b00000001;
	PORTC = 0b00000000;
}





void InitADC() {
	// Select Vref=AVcc
	ADMUX |= (1<<REFS0);
	//set prescaller to 128 and enable ADC
	ADCSRA |= (1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0)|(1<<ADEN);
}

int ReadADC(int ADCchannel) {
	//select ADC channel with safety mask
	ADMUX = (ADMUX & 0xF0) | (ADCchannel & 0x0F);
	//single conversion mode
	ADCSRA |= (1<<ADSC);
	// wait until ADC conversion is complete
	while( ADCSRA & (1<<ADSC) );
	return ADC;
}