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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 {
synth_channel_t channels[synth_channel_count];
uint16_t output;
} synth_t;
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)
{
@ -44,49 +39,49 @@ static void synth_init(void)
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++) {
synth_channel_t *chan = &synth.channels[i];
chan->phase += chan->speed;
synth.output += (chan->phase >> 8) & 0xff;
output += ((chan->phase >> 8) & 0xff) / 2;
}
return output;
}
static void init_sampletimer(void)
{
// Timer 0
//
//set timer0 to CTC & prescaler 64 == 125k
// set timer0 to CTC & prescaler 64 == 125k
TCCR0A = (1 << WGM01);
TCCR0B = (1 << CS00) | (1 << CS01);
//count up to 5 :
// count up to 5 :
OCR0A = 3;
TCNT0=0;
//enable interrupt
TCNT0 = 0;
// enable interrupt
TIMSK0 |= (1<<OCIE0A);
}
static inline void init_pwm(void)
{
//PB2 set to output:
// PB2 set to output:
DDRB |= (1 << PORTB2);
OCR1B = 0x001F; //preselect some default
OCR1B = 0x001F; // preselect some default
ICR1 = 0x00FF; // TOP-wert
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;
}
static void init_leds(void)
{
//enable LED channels as output
// enable LED channels as output
DDRC |= (1 << PORTC0) | (1 << PORTC2) | (1 << PORTC3) | (1 << PORTC1);
PORTC = 1; //one led is on...
return;
@ -94,7 +89,7 @@ static void init_leds(void)
inline void setleds(uint8_t state)
{
//set leds according to
// set leds according to
PORTC |= (state | 0b00001111);
PORTC &= ~(state | 0b11110000);
return;
@ -102,7 +97,7 @@ inline void setleds(uint8_t state)
static void init_motor(void)
{
//vibration motor on B1:
// vibration motor on B1:
DDRB |= (1 << PORTB1);
}
@ -113,68 +108,50 @@ static void init_motor(void)
int main(void)
{
//hardware initialisation:
// hardware initialisation:
init_leds();
//init_motor();
// init_motor();
init_pwm();
init_sampletimer();
//sample_pending = 0;
//synth_init();
//OCR1B = 0x00F0;
synth_init();
// OCR1B = 0x00F0;
sei();
while(1) {}
while(1){
//PORTC ^= 0b1;
}
while(1);
while(1) {
while (0 == sample_pending) ;
sample_pending = 0;
synth_mix();
}
//never get here
// never get here
return 0;
}
/*ISR(TIMER1_COMPB_vect)
{
OCR1B = 0x00F0;
} */
//25kHz
// 25kHz
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++;
if (counter > maxcounter){
counter = 0;
};
pulsecounter++;
if (pulsecounter > 0x0200){
if (pulsecounter > 0x300){
pulsecounter = 0;
pulsewidth++;
if (pulsewidth > maxcounter){
pulsewidth = 0;
}
}
OCR1B = ((counter > pulsewidth) ? 0xff : 0x00);
*/
OCR1B = ((counter > pulsewidth) ? maxcounter : 0x00);
//OCR1B = counter;
//OCR1B = OCR1B + 4;
if (OCR1B > 0x007F) {
// OCR1B = 0x00F;
}
PORTC ^= 0b01;
//ICR1 = synth.output;
//sample_pending = 1;
OCR1B = synth_mix();
}