2 #include <avr/interrupt.h>
3 #include <util/delay.h>
12 /* Synchronize to the phase lock */
14 while ((PLLCSR & _BV(PLOCK)) == 0)
18 TCCR1C = _BV(COM1D0) | _BV(COM1D1) | _BV(PWM1D);
19 TCCR1A = _BV(COM1A0) | _BV(COM1A1) | _BV(COM1B0) | _BV(COM1B1) | _BV(PWM1A) | _BV(PWM1B);
20 TCCR1B = _BV(7) // PWM1X: PWM inversion mode
21 | _BV(CS10) // no clock prescaling
24 OCR1C = 0xFF; // TOP value
27 OCR1D = OCR1B = OCR1A = 0; // initial stride is 0
29 DDRB &= ~(_BV( PB1 ) | _BV( PB3 ) | _BV( PB5 )); // tristate it
30 PORTB &= ~(_BV( PB1 ) | _BV( PB3 ) | _BV( PB5 )); // set to zero
33 void pwm_on(unsigned char n)
36 case 0: DDRB |= _BV(PB1); break;
37 case 1: DDRB |= _BV(PB3); break;
38 case 2: DDRB |= _BV(PB5); break;
42 void pwm_off(unsigned char n)
45 case 0: DDRB &= ~_BV(PB1); break;
46 case 1: DDRB &= ~_BV(PB3); break;
47 case 2: DDRB &= ~_BV(PB5); break;
51 void pwm_set(unsigned char n, unsigned char stride)
55 case 0: OCR1A = stride; break;
56 case 1: OCR1B = stride; break;
57 case 2: OCR1D = stride; break;
62 static void inline pwm_handler()