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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Scott Shawcroft 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.
*/
#ifndef MICROPY_INCLUDED_RASPBERRYPI_AUDIO_DMA_OUT_H
#define MICROPY_INCLUDED_RASPBERRYPI_AUDIO_DMA_OUT_H
#include "py/obj.h"
#include "supervisor/background_callback.h"
#include "src/rp2_common/hardware_dma/include/hardware/dma.h"
typedef struct {
mp_obj_t sample;
uint8_t *buffer[2];
size_t buffer_length[2];
uint32_t channels_to_load_mask;
uint32_t output_register_address;
background_callback_t callback;
uint8_t channel[2];
uint8_t audio_channel;
uint8_t output_size;
uint8_t sample_spacing;
uint8_t output_resolution; // in bits
uint8_t sample_resolution; // in bits
bool loop;
bool single_channel_output;
bool signed_to_unsigned;
bool unsigned_to_signed;
bool output_signed;
bool playing_in_progress;
} audio_dma_t;
typedef enum {
AUDIO_DMA_OK,
AUDIO_DMA_DMA_BUSY,
AUDIO_DMA_MEMORY_ERROR,
} audio_dma_result;
void audio_dma_init(audio_dma_t *dma);
void audio_dma_deinit(audio_dma_t *dma);
void audio_dma_reset(void);
// This sets everything up but doesn't start the timer.
// Sample is the python object for the sample to play.
// loop is true if we should loop the sample.
// single_channel_output is true if we only output a single channel. When false, all channels will be
// output.
// audio_channel is the index of the channel to dma. single_channel_output must be false in this case.
// output_signed is true if the dma'd data should be signed. False and it will be unsigned.
// output_register_address is the address to copy data to.
// dma_trigger_source is the DMA trigger source which cause another copy
audio_dma_result audio_dma_setup_playback(audio_dma_t *dma,
mp_obj_t sample,
bool loop,
bool single_channel_output,
uint8_t audio_channel,
bool output_signed,
uint8_t output_resolution,
uint32_t output_register_address,
uint8_t dma_trigger_source);
void audio_dma_stop(audio_dma_t *dma);
bool audio_dma_get_playing(audio_dma_t *dma);
void audio_dma_pause(audio_dma_t *dma);
void audio_dma_resume(audio_dma_t *dma);
bool audio_dma_get_paused(audio_dma_t *dma);
#endif // MICROPY_INCLUDED_RASPBERRYPI_AUDIO_DMA_OUT_H
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