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polyphonie

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This commit is contained in:
twobit 2012-08-06 01:45:37 +02:00
parent e854e40974
commit a2dca81d7c
1 changed files with 34 additions and 57 deletions
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91
firmware/main.c
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@ -24,15 +24,10 @@ typedef struct {
typedef struct { typedef struct {
synth_channel_t channels[synth_channel_count]; synth_channel_t channels[synth_channel_count];
uint16_t output;
} synth_t; } synth_t;
static synth_t synth; static synth_t synth;
uint8_t counter = 0;
uint8_t pulsewidth = 0;
uint16_t maxcounter = 0xFF;
uint16_t pulsecounter = 0;
static void synth_init(void) static void synth_init(void)
{ {
@ -44,49 +39,49 @@ static void synth_init(void)
synth.channels[1].speed = 1728; synth.channels[1].speed = 1728;
} }
static inline void synth_mix(void) static inline uint16_t synth_mix(void)
{ {
synth.output = 0; uint16_t output = 0;
for (int i = 0; i < synth_channel_count; i++) { for (int i = 0; i < synth_channel_count; i++) {
synth_channel_t *chan = &synth.channels[i]; synth_channel_t *chan = &synth.channels[i];
chan->phase += chan->speed; chan->phase += chan->speed;
output += ((chan->phase >> 8) & 0xff) / 2;
synth.output += (chan->phase >> 8) & 0xff;
} }
return output;
} }
static void init_sampletimer(void) static void init_sampletimer(void)
{ {
// Timer 0 // Timer 0
// // set timer0 to CTC & prescaler 64 == 125k
//set timer0 to CTC & prescaler 64 == 125k
TCCR0A = (1 << WGM01); TCCR0A = (1 << WGM01);
TCCR0B = (1 << CS00) | (1 << CS01); TCCR0B = (1 << CS00) | (1 << CS01);
//count up to 5 : // count up to 5 :
OCR0A = 3; OCR0A = 3;
TCNT0=0; TCNT0 = 0;
//enable interrupt // enable interrupt
TIMSK0 |= (1<<OCIE0A); TIMSK0 |= (1<<OCIE0A);
} }
static inline void init_pwm(void) static inline void init_pwm(void)
{ {
//PB2 set to output: // PB2 set to output:
DDRB |= (1 << PORTB2); DDRB |= (1 << PORTB2);
OCR1B = 0x001F; //preselect some default OCR1B = 0x001F; // preselect some default
ICR1 = 0x00FF; // TOP-wert ICR1 = 0x00FF; // TOP-wert
TCCR1A = (1 << COM1B1) | (1 << WGM11); // only b-chan , fastpwm (mode 14) TCCR1A = (1 << COM1B1) | (1 << WGM11); // only b-chan , fastpwm (mode 14)
TCCR1B = (1 << WGM13) | (1 << WGM12) | (1 << CS10); //Fastpwm, no prescale TCCR1B = (1 << WGM13) | (1 << WGM12) | (1 << CS10); // Fastpwm, no prescale
//TIMSK1 |= (1 << OCIE1B); //enable timer 1 Output compare // TIMSK1 |= (1 << OCIE1B); //enable timer 1 Output compare
return; return;
} }
static void init_leds(void) static void init_leds(void)
{ {
//enable LED channels as output // enable LED channels as output
DDRC |= (1 << PORTC0) | (1 << PORTC2) | (1 << PORTC3) | (1 << PORTC1); DDRC |= (1 << PORTC0) | (1 << PORTC2) | (1 << PORTC3) | (1 << PORTC1);
PORTC = 1; //one led is on... PORTC = 1; //one led is on...
return; return;
@ -94,7 +89,7 @@ static void init_leds(void)
inline void setleds(uint8_t state) inline void setleds(uint8_t state)
{ {
//set leds according to // set leds according to
PORTC |= (state | 0b00001111); PORTC |= (state | 0b00001111);
PORTC &= ~(state | 0b11110000); PORTC &= ~(state | 0b11110000);
return; return;
@ -102,7 +97,7 @@ inline void setleds(uint8_t state)
static void init_motor(void) static void init_motor(void)
{ {
//vibration motor on B1: // vibration motor on B1:
DDRB |= (1 << PORTB1); DDRB |= (1 << PORTB1);
} }
@ -113,69 +108,51 @@ static void init_motor(void)
int main(void) int main(void)
{ {
//hardware initialisation: // hardware initialisation:
init_leds(); init_leds();
//init_motor(); // init_motor();
init_pwm(); init_pwm();
init_sampletimer(); init_sampletimer();
//sample_pending = 0;
//synth_init(); synth_init();
//OCR1B = 0x00F0; // OCR1B = 0x00F0;
sei(); sei();
while(1) {}
while(1){ // never get here
//PORTC ^= 0b1;
}
while(1);
while(1) {
while (0 == sample_pending) ;
sample_pending = 0;
synth_mix();
}
//never get here
return 0; return 0;
} }
/*ISR(TIMER1_COMPB_vect)
{
OCR1B = 0x00F0;
} */
//25kHz // 25kHz
ISR(TIMER0_COMPA_vect) ISR(TIMER0_COMPA_vect)
{ {
// test stuff
/*
static uint16_t counter = 0;
static uint16_t pulsewidth = 0;
static uint16_t maxcounter = 0x133;
static uint16_t pulsecounter = 0;
counter++; counter++;
if (counter > maxcounter){ if (counter > maxcounter){
counter = 0; counter = 0;
}; };
pulsecounter++; pulsecounter++;
if (pulsecounter > 0x0200){ if (pulsecounter > 0x300){
pulsecounter = 0; pulsecounter = 0;
pulsewidth++; pulsewidth++;
if (pulsewidth > maxcounter){ if (pulsewidth > maxcounter){
pulsewidth = 0; pulsewidth = 0;
} }
} }
OCR1B = ((counter > pulsewidth) ? 0xff : 0x00);
*/
OCR1B = synth_mix();
OCR1B = ((counter > pulsewidth) ? maxcounter : 0x00);
//OCR1B = counter;
//OCR1B = OCR1B + 4;
if (OCR1B > 0x007F) {
// OCR1B = 0x00F;
}
PORTC ^= 0b01;
//ICR1 = synth.output;
//sample_pending = 1;
} }