m workin on d code which i hv copied here...d logic dt svicent provided me, 2 hv variabl amplitude,requires a lot 2 b changed in ds code..findin cumbersome,cn u suggest 4 d same..
n yes..thru makin changes in d luk up tabl nly,i generated d oder waves..so i hope dose changes wud b applicabl 4 oder waves as wel..
n can sum1 clear dis doubt of mine...OCR1A define the top value for the counter, hence also its resolution.The counter value increases until a Compare Match occurs with OCR1A and then counter is cleared.
i wanted 2 knw wat exactly it means 2 defining d top value of counter,how cum compare match occurs at top value of counter..it can be at any value i guess n dt shud decide PWM's on tim...
plz suggest...
thank you alll..
Code for generation of Sine Wave
#include <avr\io.h>
#include <avr\interrupt.h>
#include <avr/pgmspace.h>
const uint8_t sinewave[] PROGMEM=
{
0x80,0x83,0x86,0x89,0x8c,0x8f,0x92,0x95,0x98,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0xae,
0xb0,0xb3,0xb6,0xb9,0xbc,0xbf,0xc1,0xc4,0xc7,0xc9,0xcc,0xce,0xd1,0xd3,0xd5,0xd8,
0xda,0xdc,0xde,0xe0,0xe2,0xe4,0xe6,0xe8,0xea,0xec,0xed,0xef,0xf0,0xf2,0xf3,0xf5,
0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfc,0xfd,0xfe,0xfe,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0xfe,0xfd,0xfc,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,
0xf6,0xf5,0xf3,0xf2,0xf0,0xef,0xed,0xec,0xea,0xe8,0xe6,0xe4,0xe2,0xe0,0xde,0xdc,
0xda,0xd8,0xd5,0xd3,0xd1,0xce,0xcc,0xc9,0xc7,0xc4,0xc1,0xbf,0xbc,0xb9,0xb6,0xb3,
0xb0,0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,0x98,0x95,0x92,0x8f,0x8c,0x89,0x86,0x83,
0x80,0x7c,0x79,0x76,0x73,0x70,0x6d,0x6a,0x67,0x63,0x60,0x5d,0x5a,0x57,0x54,0x51,
0x4f,0x4c,0x49,0x46,0x43,0x40,0x3e,0x3b,0x38,0x36,0x33,0x31,0x2e,0x2c,0x2a,0x27,
0x25,0x23,0x21,0x1f,0x1d,0x1b,0x19,0x17,0x15,0x13,0x12,0x10,0x0f,0x0d,0x0c,0x0a,
0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x03,0x02,0x01,0x01,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x02,0x03,0x03,0x04,0x05,0x06,0x07,0x08,
0x09,0x0a,0x0c,0x0d,0x0f,0x10,0x12,0x13,0x15,0x17,0x19,0x1b,0x1d,0x1f,0x21,0x23,
0x25,0x27,0x2a,0x2c,0x2e,0x31,0x33,0x36,0x38,0x3b,0x3e,0x40,0x43,0x46,0x49,0x4c,
0x4f,0x51,0x54,0x57,0x5a,0x5d,0x60,0x63,0x67,0x6a,0x6d,0x70,0x73,0x76,0x79,0x7c
};
uint8_t i=0;
ISR(TIMER1_COMPA_vect){
OCR1A=pgm_read_byte(&sinewave);
i++;
}
int main(void) {
//Port D pins as input
DDRD=0x00;
//Enable internal pull ups
PORTD=0xFF;
//Set PORTB1 pin as output
DDRB=0xFF;
// initial OCR1A value
OCR1A=0x80;
//Output compare OC1A 8 bit non inverted PWM
TCCR1A=0x91;
//start timer without prescaler
TCCR1B=0x01;
//enable output compare interrupt for OCR1A
TIMSK=0x10;
//enable global interrupts
sei();
while (1) {
//loop for ever. Interrupts will do the job.
}
}