led-strip/main.c

#define F_CPU 8000000UL
#include <util/delay.h>
#include <avr/io.h>
#include <avr/interrupt.h>

#define PATTERN_COUNT 4

typedef struct
{
	unsigned char r;
	unsigned char g;
	unsigned char b;
	int time_hold;
}rgbval;
volatile uint16_t ms;
volatile int  counts;

ISR(TIMER0_OVF_vect)
{
		count();
}
void count(void)
{
	//counts=0;//0..65535 
	counts++;
	if(counts>=31)
	{
			counts=0;
			if(ms<60000)//1 minute
			{
					ms++;
			}
			else
			{
					ms=0;
			}
	}
}

int main (void)
{            
	rgbval pattern[6][PATTERN_COUNT]={	{{0,0,0,10},		{0,0,0,10},		{0,0,0,10},			{0,0,0,10}},
										{{1,1,1,10},		{1,1,153,20}, 	{200,50,39,10}, 	{204,255,153,20}},
										{{1,1,1,10},		{10,255,0,10},	{1,1,255,20},		{1,200,1,20}},
										{{1,1,5,10},		{1,1,255,10},	{1,1,5,10},			{1,1,255,10}},
										{{252,102,3,10},	{161,67,47,10},	{118,120,74,10},	{83,120,74,20}},
										{{87,119,122,10}, {95,87,122,10},	{52, 69, 56,10},	{83, 84, 72,10}}};
	int i=0,i2=0,i3;
	int r,g,b = 0;
	int set=0;
	int input=0;
	uint16_t pre_delay=0;
	ms =0;
	counts = 0;	 
//disable prescaler	
	CLKPR = (1<<CLKPR);
	CLKPR = 0x00;
//#######OC0A auf ausgang
	DDRB = (1 << PB0 )|(1<<PB1)|(1<<PB4);
	cli();
//#######Timer0-setup#####			|Phase correct pwm
	TCCR0A = (1<<COM0A1)|(1<<COM0B1)|(1<<WGM00)|(1<<WGM00);	//mode
	TCCR0B = (1<<CS00)|(1<<CS00);				//frequency /256 = 31250Hz , 1 t0 period = 8.192ms 1 increment = 0.032ms strangly prescaler of 1 results in expected results as prescaler was 256
//	PLLCSR |= (1 << PLLE) | (1 << PCKE);
//######Timer1-setup
	TCCR1 = (1<<COM1A0)|(1<<COM1A1)|(1<<CTC1)|(1<<CS12)|(1<<CS10);//|(1<<CS11)|(1<<CS13);	//frequencyi //iinverting PWM because 0 dtc not possible
	GTCCR = (1<<PWM1B)|(1<<COM1B0);				//mode + overrun clear, Set on compare match
	OCR1C = 255;						// clear timer at 255	
//######PWM_VALUE$
//timer 0
	OCR0A = 1;
	OCR0B = 1;
//timer 1
	OCR1B = 1;
//######Configure Pullups
	PORTB |= (1<<PB2);
//Interupts
	TIMSK |= (1<<TOIE0);//interrupt on overflow = one timer cycle
	TIFR |= (1<<TOV0);
	TCNT0 = 0;
//enable global interrupts
	sei();
   while(1)
   {
	   for(i=1;i<PATTERN_COUNT;i++)
	   {
			r = pattern[i2][i].r;
			g = pattern[i2][i].g;
			b = pattern[i2][i].b;
			if(i==(PATTERN_COUNT-1)) {i= -1;}
			//reset timer counter	
			while(1)
			{
			//input handling
				input=PINB;
				if(((input & (1<<PB2)) == 0 && set==0))
				{
							set=1;
							i=0;
							i2++;
							if(i2==6)
							{
									i2=0;
							}
							//cycle through and stop pwm at value 0
							//Visual feedback "mode change"
							for(i3=0;i3<i2;i3++)
							{	
										OCR0A=1;OCR0B=1;OCR1B=1;	
										_delay_ms(30);
										OCR0A=255;OCR0B=255;OCR1B=255;
										_delay_ms(30);
							}
				}
				else if(((input & (1<<PB2)) != 0))
				{
						set=0;
				
				}
			//Pattern handling		
				if(r < pattern[i2][i+1].r) {r++;}
				if(r > pattern[i2][i+1].r) {r--;}	
				if(g < pattern[i2][i+1].g) {g++;}
				if(g > pattern[i2][i+1].g) {g--;}	
				if(b < pattern[i2][i+1].b) {b++;}
				if(b > pattern[i2][i+1].b) {b--;}			
				OCR0A = g;//green
				OCR0B = r;//red
				OCR1B = b;//blue
			//	_delay_ms(10);	
				pre_delay = ms;		
				while((ms-pre_delay) < pattern[i2][i+1].time_hold){};
				if(r == pattern[i2][i+1].r && g == pattern[i2][i+1].g && b == pattern[i2][i+1].b) break;
			}
	   }
   }  
   return 0;                 
}