111 lines
3.7 KiB
C
111 lines
3.7 KiB
C
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2023 Jeff Epler for Adafruit Industries
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include "shared-bindings/synthio/LFO.h"
|
|
#include "shared-module/synthio/LFO.h"
|
|
#include <math.h>
|
|
|
|
#define ONE (MICROPY_FLOAT_CONST(1.))
|
|
#define ZERO (MICROPY_FLOAT_CONST(0.))
|
|
|
|
mp_float_t common_hal_synthio_lfo_tick(mp_obj_t self_in) {
|
|
synthio_lfo_obj_t *lfo = MP_OBJ_TO_PTR(self_in);
|
|
|
|
mp_float_t rate = synthio_block_slot_get(&lfo->rate) * synthio_global_rate_scale;
|
|
|
|
mp_float_t accum = lfo->accum + rate;
|
|
int len = lfo->waveform_bufinfo.len / 2;
|
|
mp_float_t frac = accum - MICROPY_FLOAT_C_FUN(floor)(accum);
|
|
size_t idx = (int)(frac * len);
|
|
|
|
if (lfo->once) {
|
|
if (rate > 0) {
|
|
if (accum >= ONE) {
|
|
frac = ONE;
|
|
idx = len - 1;
|
|
}
|
|
} else if (rate < 0 && accum < ZERO) {
|
|
frac = ZERO;
|
|
idx = 0;
|
|
}
|
|
}
|
|
|
|
lfo->accum = frac;
|
|
|
|
int16_t *waveform = lfo->waveform_bufinfo.buf;
|
|
assert(idx < lfo->waveform_bufinfo.len / 2);
|
|
mp_float_t scale = synthio_block_slot_get(&lfo->scale);
|
|
mp_float_t offset = synthio_block_slot_get(&lfo->offset);
|
|
mp_float_t value = MICROPY_FLOAT_C_FUN(ldexp)(waveform[idx], -15) * scale + offset;
|
|
|
|
return value;
|
|
}
|
|
|
|
mp_obj_t common_hal_synthio_lfo_get_waveform_obj(synthio_lfo_obj_t *self) {
|
|
return self->waveform_obj;
|
|
}
|
|
|
|
mp_obj_t common_hal_synthio_lfo_get_rate_obj(synthio_lfo_obj_t *self) {
|
|
return self->rate.obj;
|
|
}
|
|
|
|
void common_hal_synthio_lfo_set_rate_obj(synthio_lfo_obj_t *self, mp_obj_t arg) {
|
|
synthio_block_assign_slot(arg, &self->rate, MP_QSTR_rate);
|
|
}
|
|
|
|
mp_obj_t common_hal_synthio_lfo_get_scale_obj(synthio_lfo_obj_t *self) {
|
|
return self->scale.obj;
|
|
}
|
|
void common_hal_synthio_lfo_set_scale_obj(synthio_lfo_obj_t *self, mp_obj_t arg) {
|
|
synthio_block_assign_slot(arg, &self->scale, MP_QSTR_scale);
|
|
}
|
|
|
|
mp_obj_t common_hal_synthio_lfo_get_offset_obj(synthio_lfo_obj_t *self) {
|
|
return self->offset.obj;
|
|
}
|
|
void common_hal_synthio_lfo_set_offset_obj(synthio_lfo_obj_t *self, mp_obj_t arg) {
|
|
synthio_block_assign_slot(arg, &self->offset, MP_QSTR_offset);
|
|
}
|
|
|
|
bool common_hal_synthio_lfo_get_once(synthio_lfo_obj_t *self) {
|
|
return self->once;
|
|
}
|
|
void common_hal_synthio_lfo_set_once(synthio_lfo_obj_t *self, bool arg) {
|
|
self->once = arg;
|
|
}
|
|
|
|
mp_float_t common_hal_synthio_lfo_get_value(synthio_lfo_obj_t *self) {
|
|
return self->base.value;
|
|
}
|
|
|
|
mp_float_t common_hal_synthio_lfo_get_phase(synthio_lfo_obj_t *self) {
|
|
return self->accum;
|
|
}
|
|
|
|
void common_hal_synthio_lfo_retrigger(synthio_lfo_obj_t *self) {
|
|
self->accum = 0;
|
|
}
|