audio: replace es7210_adc_set_gain

Apparently the ESP32-S3-BOX-Lite uses different audio chips than the
other ESP32-S3-BOX variants. We unconditionally call
es7210_adc_set_gain() to set the MIC gain, and with ESP-ADF 2.7 and
ESP-IDF 5.3, using the new I2C driver, this causes a crash due to the
es7210 i2c_handle being NULL.

Fix this by using audio_codec_set_volume on the ADC audio handle.

Fixes: #437

Author: stintel

main/audio.c

@@ -4,7 +4,6 @@
 #include "audio_pipeline.h"
 #include "audio_thread.h"
 #include "board.h"
-#include "es7210.h"
 #include "esp_check.h"
 #include "esp_decoder.h"
 #include "esp_http_client.h"
@@ -1023,7 +1022,7 @@ void init_adc(void)
     };
 
     hdl_aha->audio_codec_config_iface(AUDIO_HAL_CODEC_MODE_ENCODE, &cfg_i2s);
-    es7210_adc_set_gain(ES7210_MIC_SELECT, config_get_int("mic_gain", DEFAULT_MIC_GAIN));
+    hdl_aha->audio_codec_set_volume(config_get_int("mic_gain", DEFAULT_MIC_GAIN));
 }
 
 esp_err_t init_audio(void)
@@ -1052,7 +1051,7 @@ esp_err_t init_audio(void)
     }
     free(speech_rec_mode);
     ESP_RETURN_ON_ERROR(start_rec(), TAG, "start_rec failed");
-    es7210_adc_set_gain(ES7210_MIC_SELECT, config_get_int("mic_gain", DEFAULT_MIC_GAIN));
+    hdl_aha->audio_codec_set_volume(config_get_int("mic_gain", DEFAULT_MIC_GAIN));
 
     ESP_LOGI(TAG, "app_main() - start_rec() finished");
 

main/shared.h

@@ -2,7 +2,3 @@
 #define DEFAULT_MIC_GAIN         14
 #define DEFAULT_SPEECH_REC_MODE  "WIS"
 #define DEFAULT_WAS_MODE         false
-
-#ifndef ES7210_MIC_SELECT
-#define ES7210_MIC_SELECT (ES7210_INPUT_MIC1 | ES7210_INPUT_MIC2)
-#endif