f0859ac954
The EVSYS is used to generate an interrupt from the event. This simplifies timing used in pulseio that conflicted with the auto-reload countdown. Fixes #3890
105 lines
3.7 KiB
C
105 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) 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.h"
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#include "py/obj.h"
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#include "shared-module/audiocore/RawSample.h"
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#include "shared-module/audiocore/WaveFile.h"
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#include "supervisor/background_callback.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_output;
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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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background_callback_t callback;
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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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uint8_t dma_allocate_channel(void);
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void dma_free_channel(uint8_t channel);
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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_output 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_output 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_output,
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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_disable_channel(uint8_t channel);
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void audio_dma_enable_channel(uint8_t channel);
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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_pause(audio_dma_t *dma);
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void audio_dma_resume(audio_dma_t *dma);
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bool audio_dma_get_paused(audio_dma_t *dma);
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void audio_dma_background(void);
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uint8_t find_sync_event_channel_raise(void);
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void audio_evsys_handler(void);
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#endif // MICROPY_INCLUDED_ATMEL_SAMD_AUDIO_DMA_H
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