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esp32: audio use I2S config from LyraT v4.3 board

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This commit is contained in:
Matthias Ringwald 2021-12-28 17:03:33 +01:00
parent ea6419f9b7
commit 52a720ae15
2 changed files with 27 additions and 24 deletions
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17
port/esp32/README.md
View File

@ -52,17 +52,22 @@ There are different issues in the Bluetooth Controller of the ESP32 that is prov
### Audio playback
Audio playback is implemented by `btstack_audio_esp32.c`. It assumes an I2S Codec connected as follows:
Audio playback is implemented by `btstack_audio_esp32.c` and supports generic I2S codecs as well as the ES8388 on the [ESP32 LyraT v4.3](https://docs.espressif.com/projects/esp-adf/en/latest/design-guide/board-esp32-lyrat-v4.3.html) devkit.
It uses the first I2S interface with the following pin out:
ESP32 pin | I2S Pin
----------|---------
GPIO0 | MCK
GPIO5 | BCLK
GPIO25 | LRCK
GPIO26 | BCLK
GPIO22 | DATA
GPIO26 | DOUT
GPIO35 | DIN
We've used the MAX98357A on the [Adafruit breakout board](https://www.adafruit.com/product/3006). The simplest example is the mod_player, which plays back an 8 kB sound file and the a2dp_sink_demo implements a basic Bluetooth loudspeaker.
If support for the LyraT v4.3 is enabled, e.g. via menuconfig - Example Board Configuration --> ESP32 board --> ESP32-LyraT V4.3, CONFIG_ESP_LYRAT_V4_3_BOARD gets defined and the ES8388 will be configured as well.
We've also used the MAX98357A on the [Adafruit breakout board](https://www.adafruit.com/product/3006). The simplest example is the mod_player, which plays back an 8 kB sound file and the a2dp_sink_demo that implements a basic Bluetooth loudspeaker.
Audio input via I2S or ADC is not supported yet. We might have a look at it when [HFP/SCO via VHCI](https://github.com/espressif/esp-idf/issues/1118) is working on the ESP32.
### Multi-Threading

34
port/esp32/components/btstack/btstack_audio_esp32.c
View File

@ -187,30 +187,28 @@ static void btstack_audio_esp32_init(void){
i2s_driver_uninstall(BTSTACK_AUDIO_I2S_NUM);
}
// set i2s mode and pins based on sink / source state
// set i2s mode, sample rate and pins based on sink / source config
i2s_mode_t i2s_mode = I2S_MODE_MASTER;
int i2s_data_out_pin = I2S_PIN_NO_CHANGE;
int i2s_data_in_pin = I2S_PIN_NO_CHANGE;
#ifdef CONFIG_ESP_LYRAT_V4_3_BOARD
int i2s_bck_io_pin = GPIO_NUM_5;
#else
int i2s_bck_io_pin = 26;
#endif
btstack_audio_esp32_i2s_samplerate = 0;
if (btstack_audio_esp32_sink_state != BTSTACK_AUDIO_ESP32_OFF){
i2s_mode |= I2S_MODE_TX; // playback
btstack_audio_esp32_i2s_samplerate = btstack_audio_esp32_sink_samplerate;
#ifdef CONFIG_ESP_LYRAT_V4_3_BOARD
i2s_data_out_pin = GPIO_NUM_26;
#else
i2s_data_out_pin = 22;
#endif
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){
i2s_mode |= I2S_MODE_RX; // recording
btstack_audio_esp32_i2s_samplerate = btstack_audio_esp32_source_samplerate;
#ifdef CONFIG_ESP_LYRAT_V4_3_BOARD
i2s_data_in_pin = GPIO_NUM_35;
#endif
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_config_t config =
@ -227,7 +225,7 @@ static void btstack_audio_esp32_init(void){
i2s_pin_config_t pins =
{
.bck_io_num = i2s_bck_io_pin,
.bck_io_num = GPIO_NUM_5,
.ws_io_num = GPIO_NUM_25,
.data_out_num = i2s_data_out_pin,
.data_in_num = i2s_data_in_pin
@ -323,15 +321,15 @@ static void btstack_audio_esp32_sink_start_stream(void){
// validate samplerate
btstack_assert(btstack_audio_esp32_sink_samplerate == btstack_audio_esp32_i2s_samplerate);
// state
btstack_audio_esp32_sink_state = BTSTACK_AUDIO_ESP32_STREAMING;
// pre-fill HAL buffers
uint16_t i;
for (i=0;i<DMA_BUFFER_COUNT;i++){
btstack_audio_esp32_sink_fill_buffer();
}
// state
btstack_audio_esp32_sink_state = BTSTACK_AUDIO_ESP32_STREAMING;
btstack_audio_esp32_stream_start();
}