noiseplug/avr/noiseplug.c
2012-07-31 21:42:53 +02:00

112 lines
2.1 KiB
C

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