243 lines
9.4 KiB
C
243 lines
9.4 KiB
C
/*
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* This file is part of the Micro Python 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) 2017 Scott Shawcroft 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 <stdint.h>
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#include "lib/utils/context_manager_helpers.h"
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#include "py/objproperty.h"
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#include "py/runtime.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include "shared-bindings/audioio/AudioOut.h"
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//| .. currentmodule:: audioio
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//|
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//| :class:`AudioOut` -- Output an analog audio signal
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//| ========================================================
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//|
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//| AudioOut can be used to output an analog audio signal on a given pin.
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//|
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//| .. class:: AudioOut(pin, sample_source)
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//|
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//| Create a AudioOut object associated with the given pin. This allows you to
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//| play audio signals out on the given pin. Sample_source must be a `bytes-like object <https://docs.python.org/3/glossary.html#term-bytes-like-object>`_.
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//|
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//| The sample itself should consist of 16 bit samples and be mono.
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//| Microcontrollers with a lower output resolution will use the highest order
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//| bits to output. For example, the SAMD21 has a 10 bit DAC that ignores the
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//| lowest 6 bits when playing 16 bit samples.
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//|
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//| :param ~microcontroller.Pin pin: The pin to output to
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//| :param bytes-like sample_source: The source of the sample
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//|
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//| Simple 8ksps 440 Hz sin wave::
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//|
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//| import audioio
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//| import board
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//| import array
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//| import time
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//| import math
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//|
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//| # Generate one period of sine wav.
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//| length = 8000 // 440
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//| b = array.array("H", [0] * length)
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//| for i in range(length):
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//| b[i] = int(math.sin(math.pi * 2 * i / 18) * (2 ** 15) + 2 ** 15)
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//|
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//| with audioio.AudioOut(board.SPEAKER, sin_wave) as sample:
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//| sample.play(loop=True)
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//| time.sleep(1)
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//| sample.stop()
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//|
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//| Playing a wave file from flash::
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//|
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//| import board
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//| import audioio
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//| import digitalio
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//|
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//| # Required for CircuitPlayground Express
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//| speaker_enable = digitalio.DigitalInOut(board.SPEAKER_ENABLE)
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//| speaker_enable.switch_to_output(value=True)
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//|
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//| f = open("cplay-5.1-16bit-16khz.wav", "rb")
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//
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//| a = audioio.AudioOut(board.A0, f)
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//|
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//| print("playing")
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//| a.play()
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//| while a.playing:
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//| pass
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//| print("stopped")
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//|
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STATIC mp_obj_t audioio_audioout_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 2, 2, true);
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mp_obj_t pin_obj = args[0];
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assert_pin(pin_obj, false);
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const mcu_pin_obj_t *pin = MP_OBJ_TO_PTR(pin_obj);
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// We explicitly don't check whether the pin is free because multiple
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// AudioOuts may share it.
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// create PWM object from the given pin
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audioio_audioout_obj_t *self = m_new_obj(audioio_audioout_obj_t);
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self->base.type = &audioio_audioout_type;
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mp_buffer_info_t bufinfo;
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if (MP_OBJ_IS_TYPE(args[1], &fatfs_type_fileio)) {
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common_hal_audioio_audioout_construct_from_file(self, pin, MP_OBJ_TO_PTR(args[1]));
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} else if (mp_get_buffer(args[1], &bufinfo, MP_BUFFER_READ)) {
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if (bufinfo.len % 2 == 1) {
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mp_raise_ValueError("sample_source must be an even number of bytes (two per sample)");
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}
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common_hal_audioio_audioout_construct_from_buffer(self, pin, ((uint16_t*)bufinfo.buf), bufinfo.len / 2);
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} else {
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mp_raise_TypeError("sample_source must be a file or bytes-like object.");
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}
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return MP_OBJ_FROM_PTR(self);
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}
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//| .. method:: deinit()
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//|
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//| Deinitialises the PWMOut and releases any hardware resources for reuse.
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//|
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STATIC mp_obj_t audioio_audioout_deinit(mp_obj_t self_in) {
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audioio_audioout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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common_hal_audioio_audioout_deinit(self);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(audioio_audioout_deinit_obj, audioio_audioout_deinit);
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//| .. method:: __enter__()
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//|
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//| No-op used by Context Managers.
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//|
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// Provided by context manager helper.
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//| .. method:: __exit__()
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//|
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//| Automatically deinitializes the hardware when exiting a context.
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//|
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STATIC mp_obj_t audioio_audioout_obj___exit__(size_t n_args, const mp_obj_t *args) {
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(void)n_args;
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common_hal_audioio_audioout_deinit(args[0]);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(audioio_audioout___exit___obj, 4, 4, audioio_audioout_obj___exit__);
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//| .. method:: play(loop=False)
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//|
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//| Plays the sample once when loop=False and continuously when loop=True.
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//| Does not block. Use `playing` to block.
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//|
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STATIC mp_obj_t audioio_audioout_obj_play(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
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enum { ARG_loop };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_loop, MP_ARG_BOOL, {.u_bool = false} },
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};
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audioio_audioout_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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common_hal_audioio_audioout_play(self, args[ARG_loop].u_bool);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(audioio_audioout_play_obj, 1, audioio_audioout_obj_play);
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//| .. method:: stop()
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//|
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//| Stops playback of this sample. If another sample is playing instead, it
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//| won't be stopped.
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//|
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STATIC mp_obj_t audioio_audioout_obj_stop(mp_obj_t self_in) {
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audioio_audioout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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common_hal_audioio_audioout_stop(self);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_1(audioio_audioout_stop_obj, audioio_audioout_obj_stop);
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//| .. attribute:: playing
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//|
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//| True when the audio sample is being output.
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//|
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STATIC mp_obj_t audioio_audioout_obj_get_playing(mp_obj_t self_in) {
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audioio_audioout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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return mp_obj_new_bool(common_hal_audioio_audioout_get_playing(self));
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}
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MP_DEFINE_CONST_FUN_OBJ_1(audioio_audioout_get_playing_obj, audioio_audioout_obj_get_playing);
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const mp_obj_property_t audioio_audioout_playing_obj = {
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.base.type = &mp_type_property,
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.proxy = {(mp_obj_t)&audioio_audioout_get_playing_obj,
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(mp_obj_t)&mp_const_none_obj,
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(mp_obj_t)&mp_const_none_obj},
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};
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//| .. attribute:: frequency
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//|
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//| 32 bit value that dictates how quickly samples are loaded into the DAC
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//| in Hertz (cycles per second). When the sample is looped, this can change
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//| the pitch output without changing the underlying sample.
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//|
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STATIC mp_obj_t audioio_audioout_obj_get_frequency(mp_obj_t self_in) {
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audioio_audioout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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return MP_OBJ_NEW_SMALL_INT(common_hal_audioio_audioout_get_frequency(self));
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}
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MP_DEFINE_CONST_FUN_OBJ_1(audioio_audioout_get_frequency_obj, audioio_audioout_obj_get_frequency);
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STATIC mp_obj_t audioio_audioout_obj_set_frequency(mp_obj_t self_in, mp_obj_t frequency) {
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audioio_audioout_obj_t *self = MP_OBJ_TO_PTR(self_in);
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common_hal_audioio_audioout_set_frequency(self, mp_obj_get_int(frequency));
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(audioio_audioout_set_frequency_obj, audioio_audioout_obj_set_frequency);
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const mp_obj_property_t audioio_audioout_frequency_obj = {
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.base.type = &mp_type_property,
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.proxy = {(mp_obj_t)&audioio_audioout_get_frequency_obj,
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(mp_obj_t)&audioio_audioout_set_frequency_obj,
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(mp_obj_t)&mp_const_none_obj},
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};
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STATIC const mp_rom_map_elem_t audioio_audioout_locals_dict_table[] = {
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// Methods
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{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&audioio_audioout_deinit_obj) },
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{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
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{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&audioio_audioout___exit___obj) },
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{ MP_ROM_QSTR(MP_QSTR_play), MP_ROM_PTR(&audioio_audioout_play_obj) },
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{ MP_ROM_QSTR(MP_QSTR_stop), MP_ROM_PTR(&audioio_audioout_stop_obj) },
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// Properties
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{ MP_ROM_QSTR(MP_QSTR_playing), MP_ROM_PTR(&audioio_audioout_playing_obj) },
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{ MP_ROM_QSTR(MP_QSTR_frequency), MP_ROM_PTR(&audioio_audioout_frequency_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(audioio_audioout_locals_dict, audioio_audioout_locals_dict_table);
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const mp_obj_type_t audioio_audioout_type = {
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{ &mp_type_type },
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.name = MP_QSTR_AudioOut,
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.make_new = audioio_audioout_make_new,
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.locals_dict = (mp_obj_dict_t*)&audioio_audioout_locals_dict,
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};
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