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prepare playback if's

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This commit is contained in:
twobit 2012-08-06 03:44:37 +02:00
parent fa4e023f21
commit c201133ee9
1 changed files with 36 additions and 11 deletions
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47
firmware/synth.c
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@ -1,17 +1,8 @@
#include <inttypes.h> #include <inttypes.h>
// sample rate is 8M / (3 * 64) // sample rate is 8M / (3 * 64)
enum { enum { WAVE_PULSE, WAVE_SAW, };
synth_channel_count = 2,
};
enum {
WAVE_PULSE,
WAVE_SAW,
};
typedef struct { typedef struct {
uint8_t wave; uint8_t wave;
@ -26,8 +17,23 @@ typedef struct {
} synth_channel_t; } synth_channel_t;
enum {
synth_channel_count = 2,
tick_length = 500,
row_length = 6,
pattern_length = 16
};
typedef struct { typedef struct {
synth_channel_t channels[synth_channel_count]; synth_channel_t channels[synth_channel_count];
int16_t sample;
int8_t tick;
int8_t row;
int8_t seq;
} synth_t; } synth_t;
static synth_t synth; static synth_t synth;
@ -49,8 +55,27 @@ void synth_init(void)
uint16_t synth_mix(void) uint16_t synth_mix(void)
{ {
uint16_t output = 0; if(synth.sample == 0) {
// new tick
if(synth.tick == 0) {
// new row
if(synth.row == 0) {
// new pattern
}
}
}
if(++synth.sample == tick_length) {
synth.sample = 0;
if(++synth.tick == row_length) {
synth.tick = 0;
if(++synth.row == pattern_length) {
synth.row = 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];