113 lines
1.8 KiB
C
113 lines
1.8 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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static void init_sampletimer(void)
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{
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// Timer 0
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// set timer0 to CTC & prescaler 64 == 125k
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TCCR0A = (1 << WGM01);
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TCCR0B = (1 << CS00) | (1 << CS01);
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// count up to 5 :
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OCR0A = 3;
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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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// PB2 set to output:
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DDRB |= (1 << PORTB2);
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OCR1B = 0x001F; // preselect some default
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ICR1 = 0x00FF; // TOP-wert
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TCCR1A = (1 << COM1B1) | (1 << WGM11); // only b-chan , fastpwm (mode 14)
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TCCR1B = (1 << WGM13) | (1 << WGM12) | (1 << CS10); // Fastpwm, no prescale
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// TIMSK1 |= (1 << OCIE1B); //enable timer 1 Output compare
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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) | (1 << PORTC3) | (1 << PORTC1);
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PORTC = 1; //one led is on...
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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:
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DDRB |= (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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// init_motor();
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init_pwm();
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init_sampletimer();
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synth_init();
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// OCR1B = 0x00F0;
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sei();
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while(1) {}
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// never get here
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return 0;
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}
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// 25kHz
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ISR(TIMER0_COMPA_vect)
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{
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// test stuff
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/*
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static uint16_t counter = 0;
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static uint16_t pulsewidth = 0;
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static uint16_t maxcounter = 0x133;
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static uint16_t pulsecounter = 0;
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counter++;
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if (counter > maxcounter){
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counter = 0;
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};
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pulsecounter++;
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if (pulsecounter > 0x300){
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pulsecounter = 0;
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pulsewidth++;
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if (pulsewidth > maxcounter){
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pulsewidth = 0;
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}
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}
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OCR1B = ((counter > pulsewidth) ? 0xff : 0x00);
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*/
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OCR1B = synth_mix();
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}
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