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esp32: support new audio driver in esp-idf v5

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This commit is contained in:
Dirk Helbig 2023-03-11 17:58:06 +01:00 committed by Matthias Ringwald
parent 4c7a1d3ad3
commit fe42c0dc45
3 changed files with 576 additions and 0 deletions
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7
port/esp32/components/btstack/CMakeLists.txt
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@ -44,6 +44,12 @@ set(src_dirs
"${IDF_PATH}/components/lwip/lwip/src/apps/http"
".")
if("${IDF_VERSION_MAJOR}.${IDF_VERSION_MINOR}" VERSION_GREATER_EQUAL "5.0")
set(exclude_srcs "btstack_audio_esp32_v4.c")
else()
set(exclude_srcs "btstack_audio_esp32_v5.c")
endif()
if(CONFIG_IDF_TARGET_ESP32)
list(APPEND src_dirs "src/classic")
endif()
@ -60,6 +66,7 @@ set(priv_requires
)
idf_component_register(SRC_DIRS "${src_dirs}"
EXCLUDE_SRCS "${exclude_srcs}"
INCLUDE_DIRS "${include_dirs}"
PRIV_INCLUDE_DIRS "${priv_include_dirs}"
PRIV_REQUIRES ${priv_requires})

8
port/esp32/components/btstack/btstack_audio_esp32.c → port/esp32/components/btstack/btstack_audio_esp32_v4.c
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@ -366,6 +366,9 @@ static int btstack_audio_esp32_sink_init(
return 0;
}
static uint32_t btstack_audio_esp32_sink_get_samplerate(void) {
return btstack_audio_esp32_sink_samplerate;
}
static void btstack_audio_esp32_sink_set_volume(uint8_t gain) {
#ifdef CONFIG_ESP_LYRAT_V4_3_BOARD
if (!btstack_audio_esp32_es8388_initialized) return;
@ -418,6 +421,7 @@ static void btstack_audio_esp32_sink_close(void){
static const btstack_audio_sink_t btstack_audio_esp32_sink = {
.init = &btstack_audio_esp32_sink_init,
.get_samplerate = &btstack_audio_esp32_sink_get_samplerate,
.set_volume = &btstack_audio_esp32_sink_set_volume,
.start_stream = &btstack_audio_esp32_sink_start_stream,
.stop_stream = &btstack_audio_esp32_sink_stop_stream,
@ -472,6 +476,9 @@ static int btstack_audio_esp32_source_init(
return 0;
}
static uint32_t btstack_audio_esp32_source_get_samplerate(void) {
return btstack_audio_esp32_source_samplerate;
}
static void btstack_audio_esp32_source_set_gain(uint8_t gain) {
#ifdef CONFIG_ESP_LYRAT_V4_3_BOARD
if (!btstack_audio_esp32_es8388_initialized) return;
@ -520,6 +527,7 @@ static void btstack_audio_esp32_source_close(void){
static const btstack_audio_source_t btstack_audio_esp32_source = {
.init = &btstack_audio_esp32_source_init,
.get_samplerate = &btstack_audio_esp32_source_get_samplerate,
.set_gain = &btstack_audio_esp32_source_set_gain,
.start_stream = &btstack_audio_esp32_source_start_stream,
.stop_stream = &btstack_audio_esp32_source_stop_stream,

561
port/esp32/components/btstack/btstack_audio_esp32_v5.c Normal file
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@ -0,0 +1,561 @@
/*
* Copyright (C) 2023 BlueKitchen GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* 4. Any redistribution, use, or modification is done solely for
* personal benefit and not for any commercial purpose or for
* monetary gain.
*
* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
* GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Please inquire about commercial licensing options at
* contact@bluekitchen-gmbh.com
*
*/
#define BTSTACK_FILE__ "btstack_audio_esp32.c"
/*
* btstack_audio_esp32.c
*
* Implementation of btstack_audio.h using polling ESP32 I2S driver
*
*/
#include "btstack_config.h"
#include "btstack_debug.h"
#include "btstack_audio.h"
#include "btstack_run_loop.h"
#include "freertos/FreeRTOS.h"
#include "freertos/queue.h"
#include "driver/gpio.h"
#include "driver/i2s_std.h"
#include "esp_log.h"
#include <inttypes.h>
#include <stdatomic.h>
#include <string.h>
#define LOG_TAG "AUDIO"
#ifdef CONFIG_I2S_ISR_IRAM_SAFE
#error CONFIG_I2S_ISR_IRAM_SAFE not supported
#endif
i2s_chan_handle_t tx_handle = NULL;
i2s_chan_handle_t rx_handle = NULL;
#ifdef CONFIG_ESP_LYRAT_V4_3_BOARD
#include "driver/i2c.h"
#include "es8388.h"
#define IIC_DATA (GPIO_NUM_18)
#define IIC_CLK (GPIO_NUM_23)
#endif
#if CONFIG_IDF_TARGET_ESP32C3
// Arbitrary choice - Strapping Pins 2,8,9 are used as outputs
#define BTSTACK_AUDIO_I2S_BCK GPIO_NUM_2
#define BTSTACK_AUDIO_I2S_WS GPIO_NUM_8
#define BTSTACK_AUDIO_I2S_OUT GPIO_NUM_9
#define BTSTACK_AUDIO_I2S_IN GPIO_NUM_10
#elif CONFIG_IDF_TARGET_ESP32S3
// ESP32-S3-Korvo-2 V3.0
#define BTSTACK_AUDIO_I2S_BCK GPIO_NUM_9
#define BTSTACK_AUDIO_I2S_WS GPIO_NUM_45
#define BTSTACK_AUDIO_I2S_OUT GPIO_NUM_8
#define BTSTACK_AUDIO_I2S_IN GPIO_NUM_10
#else
// ESP32-LyraT V4
#define BTSTACK_AUDIO_I2S_MCLK GPIO_NUM_0
#define BTSTACK_AUDIO_I2S_BCK GPIO_NUM_5
#define BTSTACK_AUDIO_I2S_WS GPIO_NUM_25
#define BTSTACK_AUDIO_I2S_OUT GPIO_NUM_26
#define BTSTACK_AUDIO_I2S_IN GPIO_NUM_35
#endif
// prototypes
#if 0
static void btstack_audio_esp32_sink_fill_buffer(void);
static void btstack_audio_esp32_source_process_buffer(void);
#endif
#define BTSTACK_AUDIO_I2S_NUM (I2S_NUM_0)
#define DRIVER_ISR_INTERVAL_MS 10 // dma interrupt cycle time in ms
#define DMA_BUFFER_COUNT 2
#define BYTES_PER_SAMPLE_STEREO 4
// one DMA buffer for max sample rate
#define MAX_DMA_BUFFER_SAMPLES (48000 * 2 * DRIVER_ISR_INTERVAL_MS/ 1000)
typedef enum {
BTSTACK_AUDIO_ESP32_OFF = 0,
BTSTACK_AUDIO_ESP32_INITIALIZED,
BTSTACK_AUDIO_ESP32_STREAMING
} btstack_audio_esp32_state_t;
static bool btstack_audio_esp32_i2s_installed;
static bool btstack_audio_esp32_i2s_streaming;
static uint32_t btstack_audio_esp32_i2s_samplerate;
static uint8_t btstack_audio_esp32_sink_num_channels;
static uint32_t btstack_audio_esp32_sink_samplerate;
static uint8_t btstack_audio_esp32_source_num_channels;
static uint32_t btstack_audio_esp32_source_samplerate;
static btstack_audio_esp32_state_t btstack_audio_esp32_sink_state;
static btstack_audio_esp32_state_t btstack_audio_esp32_source_state;
// client
static void (*btstack_audio_esp32_sink_playback_callback)(int16_t * buffer, uint16_t num_samples);
static void (*btstack_audio_esp32_source_recording_callback)(const int16_t * buffer, uint16_t num_samples);
#ifdef CONFIG_ESP_LYRAT_V4_3_BOARD
static bool btstack_audio_esp32_es8388_initialized;
static es8388_config_t es8388_i2c_cfg = AUDIO_CODEC_ES8388_DEFAULT();
void btstack_audio_esp32_es8388_init(void){
if (btstack_audio_esp32_es8388_initialized) return;
btstack_audio_esp32_es8388_initialized = true;
ESP_ERROR_CHECK(es8388_init(&es8388_i2c_cfg));
ESP_ERROR_CHECK(es8388_config_fmt(ES_MODULE_ADC_DAC, ES_I2S_NORMAL));
ESP_ERROR_CHECK(es8388_set_bits_per_sample(ES_MODULE_ADC_DAC, BIT_LENGTH_16BITS));
ESP_ERROR_CHECK(es8388_start(ES_MODULE_ADC_DAC));
ESP_ERROR_CHECK(es8388_set_volume(70));
ESP_ERROR_CHECK(es8388_set_mute(false));
}
#endif
// data source for integration with btstack run-loop
static btstack_data_source_t transport_data_source;
static volatile _Atomic uint32_t isr_bytes_read = 0;
static volatile _Atomic uint32_t isr_bytes_written = 0;
static void btstack_audio_esp32_stream_start(void){
if (btstack_audio_esp32_i2s_streaming) return;
// check if needed
bool needed = (btstack_audio_esp32_sink_state == BTSTACK_AUDIO_ESP32_STREAMING)
|| (btstack_audio_esp32_source_state == BTSTACK_AUDIO_ESP32_STREAMING);
if (!needed) return;
// clear isr exchange variables to avoid data source activation
atomic_store_explicit(&isr_bytes_written, 0, memory_order_relaxed);
atomic_store_explicit(&isr_bytes_read, 0, memory_order_relaxed);
// start data source
btstack_run_loop_enable_data_source_callbacks(&transport_data_source, DATA_SOURCE_CALLBACK_POLL);
btstack_run_loop_add_data_source(&transport_data_source);
btstack_audio_esp32_i2s_streaming = true;
}
static void btstack_audio_esp32_stream_stop(void){
if (btstack_audio_esp32_i2s_streaming == false) return;
// check if still needed
bool still_needed = (btstack_audio_esp32_sink_state == BTSTACK_AUDIO_ESP32_STREAMING)
|| (btstack_audio_esp32_source_state == BTSTACK_AUDIO_ESP32_STREAMING);
if (still_needed) return;
// stop data source
btstack_run_loop_disable_data_source_callbacks(&transport_data_source, DATA_SOURCE_CALLBACK_POLL);
btstack_run_loop_remove_data_source(&transport_data_source);
atomic_store_explicit(&isr_bytes_written, 0, memory_order_relaxed);
atomic_store_explicit(&isr_bytes_read, 0, memory_order_relaxed);
btstack_audio_esp32_i2s_streaming = false;
}
static IRAM_ATTR bool i2s_rx_callback(i2s_chan_handle_t handle, i2s_event_data_t *event, void *user_ctx)
{
atomic_store_explicit(&isr_bytes_read, event->size, memory_order_relaxed);
if( isr_bytes_read > 0 ) {
btstack_run_loop_poll_data_sources_from_irq();
return true;
}
return false;
}
volatile int32_t delta;
volatile uint32_t count = 0;
static IRAM_ATTR bool i2s_tx_callback(i2s_chan_handle_t handle, i2s_event_data_t *event, void *user_ctx)
{
// isr_bytes_written = event->size;
static uint32_t last = 0;
// static uint32_t count = 0;
uint32_t current = btstack_run_loop_get_time_ms();
if( last == 0 ) {
last = current;
}
count += event->size/BYTES_PER_SAMPLE_STEREO;
delta = current-last;
if( delta >= 1000 ) {
last = current;
count = 0;
}
atomic_store_explicit(&isr_bytes_written, event->size, memory_order_relaxed);
if( isr_bytes_written > 0 ) {
btstack_run_loop_poll_data_sources_from_irq();
return true;
}
return false;
}
static uint8_t btstack_audio_esp32_buffer[MAX_DMA_BUFFER_SAMPLES * BYTES_PER_SAMPLE_STEREO];
static void i2s_data_process(btstack_data_source_t *ds, btstack_data_source_callback_type_t callback_type) {
size_t bytes_written = 0;
size_t bytes_read = 0;
uint32_t write_block_size = atomic_load_explicit(&isr_bytes_written, memory_order_relaxed);
uint32_t read_block_size = atomic_load_explicit(&isr_bytes_read, memory_order_relaxed);
// ESP_LOGW(LOG_TAG, "d:%5"PRIu32" c:%5"PRIu32"", delta, count );
switch (callback_type){
case DATA_SOURCE_CALLBACK_POLL: {
// ESP_LOGW(LOG_TAG, "%s: w:%5"PRIu32" r:%5"PRIu32"", __FUNCTION__, write_block_size, read_block_size );
uint16_t num_samples = write_block_size/BYTES_PER_SAMPLE_STEREO;
if( num_samples > 0 ) {
(*btstack_audio_esp32_sink_playback_callback)((int16_t *) btstack_audio_esp32_buffer, num_samples);
// duplicate samples for mono
if (btstack_audio_esp32_sink_num_channels == 1){
int16_t *buffer16 = (int16_t *) btstack_audio_esp32_buffer;
for (int16_t i=num_samples-1;i >= 0; i--){
buffer16[2*i ] = buffer16[i];
buffer16[2*i+1] = buffer16[i];
}
}
ESP_ERROR_CHECK(i2s_channel_write(tx_handle, btstack_audio_esp32_buffer, write_block_size, &bytes_written, 0 ));
btstack_assert( bytes_written == write_block_size );
atomic_store_explicit(&isr_bytes_written, 0, memory_order_relaxed);
}
num_samples = read_block_size/BYTES_PER_SAMPLE_STEREO;
if( num_samples > 0 ) {
ESP_ERROR_CHECK(i2s_channel_read(rx_handle, btstack_audio_esp32_buffer, read_block_size, &bytes_read, 0 ));
btstack_assert( bytes_read == read_block_size );
// drop second channel if configured for mono
int16_t * buffer16 = (int16_t *)btstack_audio_esp32_buffer;
if (btstack_audio_esp32_source_num_channels == 1){
for (uint16_t i=0;i<num_samples;i++){
buffer16[i] = buffer16[2*i];
}
}
(*btstack_audio_esp32_source_recording_callback)((int16_t *) btstack_audio_esp32_buffer, num_samples);
atomic_store_explicit(&isr_bytes_read, 0, memory_order_relaxed);
}
break;
}
default:
break;
}
}
/**
* dma_frame_num * slot_num * data_bit_width / 8 = dma_buffer_size <= 4092
* dma_frame_num <= 511
* interrupt_interval = dma_frame_num / sample_rate = 511 / 144000 = 0.003549 s = 3.549 ms
* dma_desc_num > polling_cycle / interrupt_interval = cell(10 / 3.549) = cell(2.818) = 3
* recv_buffer_size > dma_desc_num * dma_buffer_size = 3 * 4092 = 12276 bytes
*
*/
static void btstack_audio_esp32_init(void){
ESP_LOGW(LOG_TAG, "audio init");
// de-register driver if already installed
if (btstack_audio_esp32_i2s_installed){
ESP_LOGW(LOG_TAG, "allready initialized, skipping init!\n");
return;
}
// set i2s mode, sample rate and pins based on sink / source config
btstack_audio_esp32_i2s_samplerate = 0;
if (btstack_audio_esp32_sink_state != BTSTACK_AUDIO_ESP32_OFF){
if (btstack_audio_esp32_i2s_samplerate != 0){
btstack_assert(btstack_audio_esp32_i2s_samplerate == btstack_audio_esp32_sink_samplerate);
}
btstack_audio_esp32_i2s_samplerate = btstack_audio_esp32_sink_samplerate;
}
if (btstack_audio_esp32_source_state != BTSTACK_AUDIO_ESP32_OFF){
if (btstack_audio_esp32_i2s_samplerate != 0){
btstack_assert(btstack_audio_esp32_i2s_samplerate == btstack_audio_esp32_source_samplerate);
}
btstack_audio_esp32_i2s_samplerate = btstack_audio_esp32_source_samplerate;
}
i2s_chan_config_t chan_cfg = I2S_CHANNEL_DEFAULT_CONFIG(BTSTACK_AUDIO_I2S_NUM, I2S_ROLE_MASTER);
chan_cfg.dma_frame_num = DRIVER_ISR_INTERVAL_MS * btstack_audio_esp32_i2s_samplerate / 1000;
chan_cfg.dma_desc_num = DMA_BUFFER_COUNT;
btstack_assert( chan_cfg.dma_frame_num <= 4092 ); // as of https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/i2s.html
chan_cfg.auto_clear = true; // Auto clear the legacy data in the DMA buffer
ESP_ERROR_CHECK(i2s_new_channel(&chan_cfg, &tx_handle, &rx_handle));
i2s_std_config_t std_cfg = {
.clk_cfg = {
.sample_rate_hz = btstack_audio_esp32_i2s_samplerate,
.clk_src = I2S_CLK_SRC_APLL,
.mclk_multiple = I2S_MCLK_MULTIPLE_256, // for 16bit data
},
.slot_cfg = I2S_STD_PHILIPS_SLOT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_STEREO),
.gpio_cfg = {
.mclk = BTSTACK_AUDIO_I2S_MCLK,
.bclk = BTSTACK_AUDIO_I2S_BCK,
.ws = BTSTACK_AUDIO_I2S_WS,
.dout = BTSTACK_AUDIO_I2S_OUT,
.din = BTSTACK_AUDIO_I2S_IN,
.invert_flags = {
.mclk_inv = false,
.bclk_inv = false,
.ws_inv = false,
},
},
};
ESP_ERROR_CHECK(i2s_channel_init_std_mode(tx_handle, &std_cfg));
ESP_ERROR_CHECK(i2s_channel_init_std_mode(rx_handle, &std_cfg));
i2s_event_callbacks_t cbs = {
.on_recv = i2s_rx_callback,
.on_recv_q_ovf = NULL,
.on_sent = i2s_tx_callback,
.on_send_q_ovf = NULL,
};
ESP_ERROR_CHECK(i2s_channel_register_event_callback(rx_handle, &cbs, NULL));
ESP_ERROR_CHECK(i2s_channel_register_event_callback(tx_handle, &cbs, NULL));
// log_info("i2s init samplerate %" PRIu32 ", samples per DMA buffer: %u",
// btstack_audio_esp32_sink_samplerate, btstack_audio_esp32_samples_per_dma_buffer);
#ifdef CONFIG_ESP_LYRAT_V4_3_BOARD
btstack_audio_esp32_es8388_init();
#endif
btstack_audio_esp32_i2s_installed = true;
btstack_run_loop_set_data_source_handler(&transport_data_source, i2s_data_process);
ESP_LOGW(LOG_TAG, "audio init done.");
}
static void btstack_audio_esp32_deinit(void){
if (btstack_audio_esp32_i2s_installed == false) return;
// check if still needed
bool still_needed = (btstack_audio_esp32_sink_state != BTSTACK_AUDIO_ESP32_OFF)
|| (btstack_audio_esp32_source_state != BTSTACK_AUDIO_ESP32_OFF);
if (still_needed) return;
// uninstall driver
log_info("i2s close");
ESP_ERROR_CHECK(i2s_del_channel(rx_handle));
ESP_ERROR_CHECK(i2s_del_channel(tx_handle));
btstack_run_loop_disable_data_source_callbacks(&transport_data_source, DATA_SOURCE_CALLBACK_POLL);
btstack_run_loop_remove_data_source(&transport_data_source);
btstack_audio_esp32_i2s_installed = false;
}
static int btstack_audio_esp32_sink_init(
uint8_t channels,
uint32_t samplerate,
void (*playback)(int16_t * buffer, uint16_t num_samples)){
btstack_assert(playback != NULL);
btstack_assert((1 <= channels) && (channels <= 2));
// store config
btstack_audio_esp32_sink_playback_callback = playback;
btstack_audio_esp32_sink_num_channels = channels;
btstack_audio_esp32_sink_samplerate = samplerate;
btstack_audio_esp32_sink_state = BTSTACK_AUDIO_ESP32_INITIALIZED;
// init i2s and codec
btstack_audio_esp32_init();
return 0;
}
static uint32_t btstack_audio_esp32_sink_get_samplerate(void) {
return btstack_audio_esp32_sink_samplerate;
}
static void btstack_audio_esp32_sink_set_volume(uint8_t gain) {
#ifdef CONFIG_ESP_LYRAT_V4_3_BOARD
if (!btstack_audio_esp32_es8388_initialized) return;
uint8_t volume_0_100 = (uint8_t) ((((uint16_t) gain) * 100) / 128);
es8388_set_volume( volume_0_100 );
#else
UNUSED(gain);
#endif
}
static void btstack_audio_esp32_sink_start_stream(void){
if (btstack_audio_esp32_sink_state != BTSTACK_AUDIO_ESP32_INITIALIZED) return;
// validate samplerate
btstack_assert(btstack_audio_esp32_sink_samplerate == btstack_audio_esp32_i2s_samplerate);
// state
btstack_audio_esp32_sink_state = BTSTACK_AUDIO_ESP32_STREAMING;
// note: conceptually, it would make sense to pre-fill all I2S buffers and then feed new ones when they are
// marked as complete. But the corresponding function i2s_channel_preload_data is not in the v5.0.1 release
// version
btstack_audio_esp32_stream_start();
ESP_ERROR_CHECK(i2s_channel_enable(tx_handle));
}
static void btstack_audio_esp32_sink_stop_stream(void){
if (btstack_audio_esp32_sink_state != BTSTACK_AUDIO_ESP32_STREAMING) return;
// state
btstack_audio_esp32_sink_state = BTSTACK_AUDIO_ESP32_INITIALIZED;
ESP_ERROR_CHECK(i2s_channel_disable(tx_handle));
btstack_audio_esp32_stream_stop();
}
static void btstack_audio_esp32_sink_close(void){
if (btstack_audio_esp32_sink_state == BTSTACK_AUDIO_ESP32_STREAMING) {
btstack_audio_esp32_sink_stop_stream();
}
// state
btstack_audio_esp32_sink_state = BTSTACK_AUDIO_ESP32_OFF;
btstack_audio_esp32_deinit();
}
static const btstack_audio_sink_t btstack_audio_esp32_sink = {
.init = &btstack_audio_esp32_sink_init,
.get_samplerate = &btstack_audio_esp32_sink_get_samplerate,
.set_volume = &btstack_audio_esp32_sink_set_volume,
.start_stream = &btstack_audio_esp32_sink_start_stream,
.stop_stream = &btstack_audio_esp32_sink_stop_stream,
.close = &btstack_audio_esp32_sink_close
};
const btstack_audio_sink_t * btstack_audio_esp32_sink_get_instance(void){
return &btstack_audio_esp32_sink;
}
static int btstack_audio_esp32_source_init(
uint8_t channels,
uint32_t samplerate,
void (*recording)(const int16_t * buffer, uint16_t num_samples)
){
btstack_assert(recording != NULL);
// store config
btstack_audio_esp32_source_recording_callback = recording;
btstack_audio_esp32_source_num_channels = channels;
btstack_audio_esp32_source_samplerate = samplerate;
btstack_audio_esp32_source_state = BTSTACK_AUDIO_ESP32_INITIALIZED;
// init i2s and codec
btstack_audio_esp32_init();
return 0;
}
static uint32_t btstack_audio_esp32_source_get_samplerate(void) {
return btstack_audio_esp32_source_samplerate;
}
static void btstack_audio_esp32_source_set_gain(uint8_t gain) {
#ifdef CONFIG_ESP_LYRAT_V4_3_BOARD
if (!btstack_audio_esp32_es8388_initialized) return;
// ES8388 supports 0..24 dB gain in 3 dB steps
uint8_t gain_db = (uint8_t) ( ((uint16_t) gain) * 24 / 127);
es8388_set_mic_gain( (es_codec_mic_gain_t) gain_db );
#else
UNUSED(gain);
#endif
}
static void btstack_audio_esp32_source_start_stream(void){
if (btstack_audio_esp32_source_state != BTSTACK_AUDIO_ESP32_INITIALIZED) return;
// validate samplerate
btstack_assert(btstack_audio_esp32_source_samplerate == btstack_audio_esp32_i2s_samplerate);
// state
btstack_audio_esp32_source_state = BTSTACK_AUDIO_ESP32_STREAMING;
btstack_audio_esp32_stream_start();
ESP_ERROR_CHECK(i2s_channel_enable(rx_handle));
}
static void btstack_audio_esp32_source_stop_stream(void){
if (btstack_audio_esp32_source_state != BTSTACK_AUDIO_ESP32_STREAMING) return;
// state
btstack_audio_esp32_source_state = BTSTACK_AUDIO_ESP32_INITIALIZED;
ESP_ERROR_CHECK(i2s_channel_disable(rx_handle));
btstack_audio_esp32_stream_stop();
}
static void btstack_audio_esp32_source_close(void){
if (btstack_audio_esp32_source_state == BTSTACK_AUDIO_ESP32_STREAMING) {
btstack_audio_esp32_source_stop_stream();
}
// state
btstack_audio_esp32_source_state = BTSTACK_AUDIO_ESP32_OFF;
btstack_audio_esp32_deinit();
}
static const btstack_audio_source_t btstack_audio_esp32_source = {
.init = &btstack_audio_esp32_source_init,
.get_samplerate = &btstack_audio_esp32_source_get_samplerate,
.set_gain = &btstack_audio_esp32_source_set_gain,
.start_stream = &btstack_audio_esp32_source_start_stream,
.stop_stream = &btstack_audio_esp32_source_stop_stream,
.close = &btstack_audio_esp32_source_close
};
const btstack_audio_source_t * btstack_audio_esp32_source_get_instance(void){
return &btstack_audio_esp32_source;
}