130 lines
1.9 KiB
C
130 lines
1.9 KiB
C
#include <inttypes.h>
|
|
#include <avr/io.h>
|
|
#include <avr/interrupt.h>
|
|
#include <util/delay.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "main.h"
|
|
|
|
|
|
// sample rate is 8M / (5 * 64) = 25000
|
|
|
|
enum {
|
|
synth_channel_count = 2
|
|
};
|
|
|
|
typedef struct {
|
|
uint16_t phase;
|
|
uint16_t speed;
|
|
|
|
} synth_channel_t;
|
|
|
|
typedef struct {
|
|
synth_channel_t channels[synth_channel_count];
|
|
uint16_t output;
|
|
} synth_t;
|
|
|
|
|
|
static synth_t synth;
|
|
|
|
static void synth_init(void)
|
|
{
|
|
// some test values
|
|
synth.channels[0].phase = 0;
|
|
synth.channels[0].speed = 1153;
|
|
|
|
synth.channels[1].phase = 0;
|
|
synth.channels[1].speed = 23456;
|
|
}
|
|
|
|
|
|
static inline void synth_mix(void)
|
|
{
|
|
synth.output = 0;
|
|
|
|
for(int i = 0; i < synth_channel_count; i++) {
|
|
synth_channel_t* chan = &synth.channels[i];
|
|
chan->phase += chan->speed;
|
|
|
|
synth.output += (chan->phase >> 16) & 0xff;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static inline void init_pwm(void)
|
|
{
|
|
//PB1 set to output:
|
|
DDRB |= (1<<PORTB2);
|
|
OCR1B = 0xefff; //preselect some default
|
|
ICR1 = 0xffff; // TOP-wert
|
|
|
|
TCCR1A = (1<<COM1B1) | (1<<WGM11); // only b-chan , fastpwm (mode 14)
|
|
TCCR1B = (1<<WGM13)|(1<<WGM12) | (1<<CS10); //Fastpwm, no prescale
|
|
|
|
return ;
|
|
}
|
|
|
|
static void init_leds(void)
|
|
{
|
|
//enable LED channels as output
|
|
DDRC |= (1 << PORTC0) | (1 << PORTC2) | (1 << PORTC3) | (1 << PORTC1);
|
|
PORTC = 1; //one led is on...
|
|
return;
|
|
}
|
|
|
|
inline void setleds(uint8_t state)
|
|
{
|
|
//set leds according to
|
|
PORTC |= (state | 0b00001111);
|
|
PORTC &= ~(state | 0b11110000);
|
|
return;
|
|
}
|
|
|
|
static void init_motor(void)
|
|
{
|
|
//vibration motor on B1:
|
|
DDRB |= (1 << PORTB1);
|
|
|
|
}
|
|
|
|
static void stupid_pwmtest(void)
|
|
{
|
|
uint8_t i, t, r;
|
|
ICR1 = 0xAA00;
|
|
t = r = 1;
|
|
for (;;) {
|
|
|
|
t = (r) ? (t+1) : (t-1);
|
|
|
|
ICR1 = (t << 7);
|
|
if(t == 0) r ^= 1;
|
|
for(i = 1; i < 100; i++) __asm("nop");
|
|
|
|
|
|
|
|
|
|
}
|
|
return; //never
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
|
|
//hardware initialisation:
|
|
init_leds();
|
|
init_motor();
|
|
init_pwm();
|
|
|
|
synth_init();
|
|
|
|
//just stupid test for now....
|
|
stupid_pwmtest();
|
|
|
|
//never get here
|
|
return 0;
|
|
}
|