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cf21dfda64
* i2s can send now buffers * adding mono and stereo, with blocking and non blocking support * fixing crash * cosmetic changes * we dont need the & 0xffff * using unsigned integers since we'll never be using negative numbers
74 lines
3.4 KiB
C
74 lines
3.4 KiB
C
/*
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i2s.h - Software I2S library for esp8266
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Copyright (c) 2015 Hristo Gochkov. All rights reserved.
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This file is part of the esp8266 core for Arduino environment.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef I2S_h
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#define I2S_h
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/*
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How does this work? Basically, to get sound, you need to:
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- Connect an I2S codec to the I2S pins on the ESP.
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- Start up a thread that's going to do the sound output
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- Call i2s_begin()
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- Call i2s_set_rate() with the sample rate you want.
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- Generate sound and call i2s_write_sample() with 32-bit samples.
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The 32bit samples basically are 2 16-bit signed values (the analog values for
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the left and right channel) concatenated as (Rout<<16)+Lout
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i2s_write_sample will block when you're sending data too quickly, so you can just
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generate and push data as fast as you can and i2s_write_sample will regulate the
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speed.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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void i2s_begin(); // Enable TX only, for compatibility
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bool i2s_rxtx_begin(bool enableRx, bool enableTx); // Allow TX and/or RX, returns false on OOM error
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void i2s_end();
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void i2s_set_rate(uint32_t rate);//Sample Rate in Hz (ex 44100, 48000)
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void i2s_set_dividers(uint8_t div1, uint8_t div2);//Direct control over output rate
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float i2s_get_real_rate();//The actual Sample Rate on output
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bool i2s_write_sample(uint32_t sample);//32bit sample with channels being upper and lower 16 bits (blocking when DMA is full)
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bool i2s_write_sample_nb(uint32_t sample);//same as above but does not block when DMA is full and returns false instead
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bool i2s_write_lr(int16_t left, int16_t right);//combines both channels and calls i2s_write_sample with the result
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bool i2s_read_sample(int16_t *left, int16_t *right, bool blocking); // RX data returned in both 16-bit outputs.
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bool i2s_is_full();//returns true if DMA is full and can not take more bytes (overflow)
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bool i2s_is_empty();//returns true if DMA is empty (underflow)
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bool i2s_rx_is_full();
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bool i2s_rx_is_empty();
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uint16_t i2s_available();// returns the number of samples than can be written before blocking
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uint16_t i2s_rx_available();// returns the number of samples than can be written before blocking
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void i2s_set_callback(void (*callback) (void));
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void i2s_rx_set_callback(void (*callback) (void));
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// writes a buffer of frames into the DMA memory, returns the amount of frames written
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// A frame is just a int16_t for mono, for stereo a frame is two int16_t, one for each channel.
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uint16_t i2s_write_buffer_mono(int16_t *frames, uint16_t frame_count);
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uint16_t i2s_write_buffer_mono_nb(int16_t *frames, uint16_t frame_count);
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uint16_t i2s_write_buffer(int16_t *frames, uint16_t frame_count);
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uint16_t i2s_write_buffer_nb(int16_t *frames, uint16_t frame_count);
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#ifdef __cplusplus
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}
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#endif
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#endif
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