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