split between to device to have bluetooth or usb otg function.

main/usb_audio/usb_audio_host.c

@@ -2,18 +2,23 @@
  * USB Audio Host - USB Headset Unterstützung
  *
  * Verwendet ESP32-S3 USB OTG im Host-Modus für USB Audio Class Geräte
+ * Nur auf ESP32-S3 verfügbar (USB OTG Hardware)
  */
 
 #include <string.h>
 #include "usb_audio_host.h"
 #include "esp_log.h"
+#include "sdkconfig.h"
+
+static const char* TAG = "USB_AUDIO";
+
+#if CONFIG_IDF_TARGET_ESP32S3
+
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
 #include "freertos/ringbuf.h"
 #include "usb/usb_host.h"
 
-static const char* TAG = "USB_AUDIO";
-
 // USB Audio Class Definitionen
 #define USB_CLASS_AUDIO         0x01
 #define USB_SUBCLASS_AUDIOCONTROL   0x01
@@ -354,3 +359,77 @@ void usb_audio_host_register_button_callback(usb_button_callback_t callback)
 {
     s_button_callback = callback;
 }
+
+bool usb_audio_host_is_available(void)
+{
+    return true;
+}
+
+#else // Nicht ESP32-S3 - Stub-Implementierungen
+
+esp_err_t usb_audio_host_init(void)
+{
+    ESP_LOGW(TAG, "USB Audio Host nicht verfügbar (nur ESP32-S3)");
+    return ESP_ERR_NOT_SUPPORTED;
+}
+
+esp_err_t usb_audio_host_deinit(void)
+{
+    return ESP_OK;
+}
+
+usb_audio_state_t usb_audio_host_get_state(void)
+{
+    return USB_AUDIO_STATE_NOT_CONNECTED;
+}
+
+bool usb_audio_host_is_connected(void)
+{
+    return false;
+}
+
+esp_err_t usb_audio_host_get_info(usb_audio_info_t* info)
+{
+    (void)info;
+    return ESP_ERR_NOT_SUPPORTED;
+}
+
+esp_err_t usb_audio_host_start_stream(void)
+{
+    return ESP_ERR_NOT_SUPPORTED;
+}
+
+esp_err_t usb_audio_host_stop_stream(void)
+{
+    return ESP_OK;
+}
+
+esp_err_t usb_audio_host_send(const uint8_t* data, size_t len)
+{
+    (void)data;
+    (void)len;
+    return ESP_ERR_NOT_SUPPORTED;
+}
+
+esp_err_t usb_audio_host_set_volume(uint8_t volume)
+{
+    (void)volume;
+    return ESP_ERR_NOT_SUPPORTED;
+}
+
+esp_err_t usb_audio_host_set_mute(bool mute)
+{
+    (void)mute;
+    return ESP_ERR_NOT_SUPPORTED;
+}
+
+void usb_audio_host_register_state_callback(usb_audio_state_callback_t callback) { (void)callback; }
+void usb_audio_host_register_data_callback(usb_audio_data_callback_t callback) { (void)callback; }
+void usb_audio_host_register_button_callback(usb_button_callback_t callback) { (void)callback; }
+
+bool usb_audio_host_is_available(void)
+{
+    return false;
+}
+
+#endif // CONFIG_IDF_TARGET_ESP32S3

main/usb_audio/usb_audio_host.h

@@ -3,6 +3,7 @@
 #include <stdbool.h>
 #include <stdint.h>
 #include "esp_err.h"
+#include "sdkconfig.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -103,6 +104,11 @@ void usb_audio_host_register_state_callback(usb_audio_state_callback_t callback)
 void usb_audio_host_register_data_callback(usb_audio_data_callback_t callback);
 void usb_audio_host_register_button_callback(usb_button_callback_t callback);
 
+/**
+ * Prüft ob USB Audio Host verfügbar ist (Hardware-Support)
+ */
+bool usb_audio_host_is_available(void);
+
 #ifdef __cplusplus
 }
 #endif