28642ab10d
This evolves the API from 2.x (and breaks it). Playback devices are now separate from the samples themselves. This allows for greater playback flexibility. Two sample sources are audioio.RawSample and audioio.WaveFile. They can both be mono or stereo. They can be output to audioio.AudioOut or audiobusio.I2SOut. Internally, the dma tracking has changed from a TC counting block transfers to an interrupt generated by the block event sent to the EVSYS. This reduces the overhead of each DMA transfer so multiple can occure without using up TCs. Fixes #652. Fixes #522. Huge progress on #263
90 lines
3.5 KiB
C
90 lines
3.5 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) 2018 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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#ifndef MICROPY_INCLUDED_ATMEL_SAMD_AUDIO_DMA_H
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#define MICROPY_INCLUDED_ATMEL_SAMD_AUDIO_DMA_H
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#include "extmod/vfs_fat_file.h"
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#include "py/obj.h"
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#include "shared-module/audioio/RawSample.h"
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#include "shared-module/audioio/WaveFile.h"
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typedef struct {
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mp_obj_t sample;
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uint8_t dma_channel;
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uint8_t event_channel;
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uint8_t audio_channel;
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uint8_t bytes_per_sample;
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uint8_t beat_size;
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uint8_t spacing;
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bool loop;
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bool single_channel;
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bool signed_to_unsigned;
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bool unsigned_to_signed;
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bool first_buffer_free;
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uint8_t* first_buffer;
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uint8_t* second_buffer;
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bool first_descriptor_free;
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DmacDescriptor* second_descriptor;
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} audio_dma_t;
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typedef enum {
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AUDIO_DMA_OK,
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AUDIO_DMA_DMA_BUSY,
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AUDIO_DMA_MEMORY_ERROR,
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} audio_dma_result;
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uint32_t audiosample_sample_rate(mp_obj_t sample_obj);
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uint8_t audiosample_bits_per_sample(mp_obj_t sample_obj);
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uint8_t audiosample_channel_count(mp_obj_t sample_obj);
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void audio_dma_init(audio_dma_t* dma);
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void audio_dma_reset(void);
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// This sets everything up but doesn't start the timer.
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// Sample is the python object for the sample to play.
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// loop is true if we should loop the sample.
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// single_channel is true if we only output a single channel. When false, all channels will be
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// output.
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// audio_channel is the index of the channel to dma. single_channel must be false in this case.
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// output_signed is true if the dma'd data should be signed. False and it will be unsigned.
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// output_register_address is the address to copy data to.
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// dma_trigger_source is the DMA trigger source which cause another copy
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audio_dma_result audio_dma_setup_playback(audio_dma_t* dma,
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mp_obj_t sample,
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bool loop,
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bool single_channel,
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uint8_t audio_channel,
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bool output_signed,
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uint32_t output_register_address,
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uint8_t dma_trigger_source);
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void audio_dma_stop(audio_dma_t* dma);
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bool audio_dma_get_playing(audio_dma_t* dma);
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void audio_dma_background(void);
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#endif // MICROPY_INCLUDED_ATMEL_SAMD_AUDIO_DMA_H
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