56 lines
2.0 KiB
C
56 lines
2.0 KiB
C
/**
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* MIT License
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*
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* Copyright (c) 2022 Vincent Mistler
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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
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell 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
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#pragma once
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#include <stdlib.h>
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#include <string.h>
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#include <hardware/pio.h>
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#include <hardware/clocks.h>
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#include <hardware/dma.h>
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#include "audio_i2s.pio.h"
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typedef struct i2s_config_t
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{
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uint32_t sample_freq;
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uint16_t channel_count;
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uint8_t data_pin;
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uint8_t clock_pin_base;
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PIO pio;
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uint8_t sm;
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uint8_t dma_channel;
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uint16_t dma_trans_count;
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uint16_t *dma_buf;
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uint8_t volume;
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} i2s_config_t;
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i2s_config_t i2s_get_default_config(void);
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void i2s_init(i2s_config_t *i2s_config);
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void i2s_write(const i2s_config_t *i2s_config,const int16_t *samples,const size_t len);
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void i2s_dma_write(i2s_config_t *i2s_config,const int16_t *samples);
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void i2s_volume(i2s_config_t *i2s_config,uint8_t volume);
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void i2s_increase_volume(i2s_config_t *i2s_config);
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void i2s_decrease_volume(i2s_config_t *i2s_config);
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