106 lines
1.7 KiB
C
106 lines
1.7 KiB
C
#include <inttypes.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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#include <stdlib.h>
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#include "main.h"
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#include "synth.h"
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#include "usart.h"
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static void init_sampletimer(void)
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{
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/*
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* Timer 0
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*/
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/* set timer0 to CTC & prescaler 64 → 125kHz increment */
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TCCR0A = (1 << WGM01);
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TCCR0B = (1 << CS00) | (1 << CS01);
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OCR0A = 6; /* TOP */
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TCNT0 = 0;
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/*enable interrupt*/
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TIMSK0 |= (1<<OCIE0A);
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}
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static inline void init_pwm(void)
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{
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/* set PB2 as output (buzzer pwm port):*/
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DDRB |= (1 << PORTB2);
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/* analog value preselection :*/
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OCR1B = 0x007F;
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/* Top value. Timer overflows here. Thus we have a resulting 8bit pwm */
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ICR1 = 0x00FF;
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/* only b-chan , fastpwm (mode 14), no prescale */
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TCCR1A = (1 << COM1B1) | (1 << WGM11);
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TCCR1B = (1 << WGM13 ) | (1 << WGM12) | (1 << CS10);
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return;
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}
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static void init_leds(void)
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{
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/* enable LED channels as output */
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DDRC |= (1 << PORTC0) | (1 << PORTC2) |
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(1 << PORTC3) | (1 << PORTC1) ;
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/* initially one led is on */
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PORTC = 1;
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return;
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}
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inline void setleds(uint8_t state)
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{
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/* set leds according to */
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PORTC |= (state | 0b00001111);
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PORTC &= ~(state | 0b11110000);
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return;
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}
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static void init_motor(void)
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{
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/* vibration motor on B1, initially off: */
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DDRB |= (1 << PORTB1);
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PORTB &= ~( 1<<PORTB1);
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}
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int main(void)
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{
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/* hardware initialisation: */
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init_leds();
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USART0_Init();
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// init_motor();
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init_pwm();
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init_sampletimer();
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/* syntesizer initialisation */
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synth_init();
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/* here the show begins:*/
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sei();
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for(;;) /* ever */ {
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//do something
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USART0_put_uint16(0x2342);
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USART0_crlf();
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};
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/* never */ return 0;
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}
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ISR(TIMER0_COMPA_vect)
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{
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/* calculate next analog sample value in synth mixer:*/
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OCR1B = synth_mix();
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}
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