101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
#include <stdint.h>
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#include <stdbool.h>
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#include <sys/param.h>
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#include "sequencer.h"
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#include "scheduler.h"
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#include "psg.h"
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void sequencerInit() {
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}
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void sequencerExec(void *handle) {
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static uint16_t lengths[e_L_LengthEnd];
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t_melodies *melodies = (t_melodies*) handle;
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if (melodies->firstRun) {
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melodies->firstRun = false;
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lengths[e_L_1_4] = 60000 / melodies->pace; // duration of a 1/4 tone in ms
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lengths[e_L_1_2] = lengths[e_L_1_4] << 1;
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lengths[e_L_1] = lengths[e_L_1_4] << 2;
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lengths[e_L_1_8] = lengths[e_L_1_4] >> 1;
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lengths[e_L_1_16] = lengths[e_L_1_4] >> 2;
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lengths[e_L_1_32] = lengths[e_L_1_4] >> 4;
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for (uint8_t i = 0; i < e_L_LengthEnd; i++) {
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lengths[i] /= SEQUENCER_PERIOD;
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}
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}
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for (uint8_t channel = 0; channel < melodies->numOfMelodies; channel++) {
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t_melody *melody = &(melodies->melodies[channel]);
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switch (melody->state) {
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case e_Init:
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psgAmplitude(channel, melody->amplitude);
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melody->state = e_PlayTone;
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break;
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case e_PlayTone:
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if (melody->tones[melody->idx].length == e_L_SyncMark) {
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if (melodies->sync == 0) {
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melodies->sync = melodies->numOfMelodies;
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}
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melodies->sync -= 1;
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melody->state = e_Sync;
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} else {
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if (melody->tones[melody->idx].length == e_L_EndMark) {
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melody->idx = 0;
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}
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psgPlayTone(channel, melody->tones[melody->idx].octave, melody->tones[melody->idx].note);
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melody->lengthCnt = (melody->tones[melody->idx].staccato) ? (lengths[melody->tones[melody->idx].length] / 2) : lengths[melody->tones[melody->idx].length];
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melody->state = e_HoldTone;
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}
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break;
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case e_Sync:
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if (melodies->sync == 0) {
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melody->state = e_SeparateTone;
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}
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break;
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case e_HoldTone:
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melody->lengthCnt -= 1;
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if (melody->lengthCnt == 0) {
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melody->state = (melody->tones[melody->idx].staccato) ? e_StaccatoBreak : e_SeparateTone;
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}
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break;
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case e_StaccatoBreak:
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psgPlayTone(channel, e_O_Null, e_Pause);
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melody->lengthCnt = lengths[melody->tones[melody->idx].length] / 2;
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melody->state = e_HoldStaccatoBreak;
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break;
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case e_HoldStaccatoBreak:
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melody->lengthCnt -= 1;
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if (melody->lengthCnt == 0) {
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melody->state = e_SeparateTone;
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}
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break;
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case e_SeparateTone:
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if (! (melody->tones[melody->idx].legato)) {
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psgPlayTone(channel, e_O_Null, e_Pause);
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}
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melody->idx += 1;
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melody->state = e_PlayTone;
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break;
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}
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}
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}
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uint16_t sequencerPlayMelodies(t_melodies *melodies) {
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for (uint8_t i = 0; i < NUM_OF_CHANNELS; i++) {
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melodies->melodies[i].idx = 0;
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melodies->melodies[i].lengthCnt = 0;
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melodies->melodies[i].state = e_Init;
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}
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melodies->sync = 0;
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melodies->firstRun = true;
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return schAdd(sequencerExec, (void*) melodies, 0, SEQUENCER_PERIOD);
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}
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