Merge branch 'feature/usbd_msc_mount_callback' into 'master'

USBD: update example of usb device msc by adding usage of new API.

Closes IDF-7369

See merge request espressif/esp-idf!23761

examples/peripherals/usb/device/tusb_msc/main/tusb_msc_main.c

@@ -231,12 +231,19 @@ static int console_status(int argc, char **argv)
 // exit from application
 static int console_exit(int argc, char **argv)
 {
+    tinyusb_msc_unregister_callback(TINYUSB_MSC_EVENT_MOUNT_CHANGED);
     tinyusb_msc_storage_deinit();
     printf("Application Exiting\n");
     exit(0);
     return 0;
 }
 
+// callback that is delivered when storage is mounted/unmounted by application.
+static void storage_mount_changed_cb(tinyusb_msc_event_t *event)
+{
+    ESP_LOGI(TAG, "Storage mounted to application: %s", event->mount_changed_data.is_mounted ? "Yes" : "No");
+}
+
 #ifdef CONFIG_EXAMPLE_STORAGE_MEDIA_SPIFLASH
 static esp_err_t storage_init_spiflash(wl_handle_t *wl_handle)
 {
@@ -339,17 +346,21 @@ void app_main(void)
     ESP_ERROR_CHECK(storage_init_spiflash(&wl_handle));
 
     const tinyusb_msc_spiflash_config_t config_spi = {
-        .wl_handle = wl_handle
+        .wl_handle = wl_handle,
+        .callback_mount_changed = storage_mount_changed_cb  /* First way to register the callback. This is while initializing the storage. */
     };
     ESP_ERROR_CHECK(tinyusb_msc_storage_init_spiflash(&config_spi));
+    ESP_ERROR_CHECK(tinyusb_msc_register_callback(TINYUSB_MSC_EVENT_MOUNT_CHANGED, storage_mount_changed_cb)); /* Other way to register the callback i.e. registering using separate API. If the callback had been already registered, it will be overwritten. */
 #else // CONFIG_EXAMPLE_STORAGE_MEDIA_SPIFLASH
     static sdmmc_card_t *card = NULL;
     ESP_ERROR_CHECK(storage_init_sdmmc(&card));
 
     const tinyusb_msc_sdmmc_config_t config_sdmmc = {
-        .card = card
+        .card = card,
+        .callback_mount_changed = storage_mount_changed_cb  /* First way to register the callback. This is while initializing the storage. */
     };
     ESP_ERROR_CHECK(tinyusb_msc_storage_init_sdmmc(&config_sdmmc));
+    ESP_ERROR_CHECK(tinyusb_msc_register_callback(TINYUSB_MSC_EVENT_MOUNT_CHANGED, storage_mount_changed_cb)); /* Other way to register the callback i.e. registering using separate API. If the callback had been already registered, it will be overwritten. */
 #endif  // CONFIG_EXAMPLE_STORAGE_MEDIA_SPIFLASH
 
     //mounted in the app by default