112 lines
2.1 KiB
C
112 lines
2.1 KiB
C
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/*
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* main.c
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*
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* Created on: 30.10.2011
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* Author: dojoe
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*/
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#include <inttypes.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/power.h>
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#include <avr/sleep.h>
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#include <avr/pgmspace.h>
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//register uint8_t int_ctr asm("r18");
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uint8_t int_ctr;
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#if defined(__AVR_ATmega32U4__)
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ISR(TIMER0_OVF_vect)
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#elif defined(__AVR_ATtiny9__)
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ISR(TIM0_OVF_vect)
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#else
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#error "warghs"
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#endif
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{
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int_ctr = (int_ctr + 1) & 3;
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}
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#define NOISEPLUG_BIATCH
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#include "sound1.c"
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#if 0
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static inline uint8_t next_sample(const uint32_t t)
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{
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// return t*(42&t>>10);
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// return t*((42&t>>10)%14);
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// return (t*5&t>>7)|(t*3&t>>10);
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// return t*9&t>>4|t*5&t>>7|t*3&t/1024;
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// return (t*9&t>>4|t*5&t>>7|t*3&t/1024)-1;
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// return t>>4|t&((t>>5)/(t>>7-(t>>15)&-t>>7-(t>>15)));
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// return (int)(t/1e7*t*t+t)%127|t>>4|t>>5|t%127+(t>>16)|t;
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uint8_t a = t>>6&1?t>>5:-t>>4;
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uint8_t b = t>>6^t>>8|t>>12|t&63;
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return random();
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// return ((t>>6^t>>8|t>>12|t&63)&127)+((t>>6&1?t>>6:-t>>5)&63);
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// return t << 3;
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}
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#endif
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int main()
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{
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#if defined(__AVR_ATmega32U4__)
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#define SAMPLE_L OCR0A
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clock_prescale_set(clock_div_2);
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DDRB = 1 << PB7 | 1 << PB2; // PB7 == OC0A
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TCNT0 = 0;
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OCR0A = 0;
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TCCR0A = 3 << WGM00 | 2 << COM0A0; // Fast PWM mode, positive polarity
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TCCR0B = 1 << CS00; // Select main clock, no prescaling
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TIMSK0 = 1 << TOIE0; // enable overflow interrupt
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TIFR0 = 1 << TOV0; // make sure it happens
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set_sleep_mode(SLEEP_MODE_IDLE);
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sei();
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#elif defined(__AVR_ATtiny9__)
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#define SAMPLE_L OCR0AL
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CCP = 0xD8;
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CLKMSR = 0;
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CCP = 0xD8;
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CLKPSR = 0;
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PUEB = 0;
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DDRB = (1 << PB0) | (1 << PB2);
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TCNT0 = 0;
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OCR0A = 0;
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TCCR0A = (1 << WGM00) | (2 << COM0A0);
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TCCR0B = (1 << WGM02) | (1 << CS00);
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TCCR0C = 0;
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TIMSK0 = 1 << TOIE0;
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set_sleep_mode(SLEEP_MODE_IDLE);
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sei();
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TIFR0 = 1 << TOV0;
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#else
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#error "not supported"
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#endif
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uint8_t sample = 0;
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#ifdef __AVR_ATmega32U4__
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DDRE = 1 << PE6;
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uint16_t t = 0;
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#endif
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while (1) {
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sleep_mode();
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if (int_ctr == 0) {
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//PORTB = 1 << PB2;
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SAMPLE_L = sample;
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sample = next_sample();
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//PORTB = 0;
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#ifdef __AVR_ATmega32U4__
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PORTE = (t & 4096) ? 1 << PE6 : 0;
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t++;
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#endif
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}
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}
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}
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