add usb audio for pandora.

bsp/stm32/libraries/HAL_Drivers/drv_usbd.c

@@ -22,8 +22,13 @@ static struct udcd _stm_udc;
 static struct ep_id _ep_pool[] =
 {
     {0x0,  USB_EP_ATTR_CONTROL,     USB_DIR_INOUT,  64, ID_ASSIGNED  },
+#ifdef BSP_USBD_EP_ISOC
+    {0x1,  USB_EP_ATTR_ISOC,        USB_DIR_IN,     64, ID_UNASSIGNED},
+    {0x1,  USB_EP_ATTR_ISOC,        USB_DIR_OUT,    64, ID_UNASSIGNED},
+#else
     {0x1,  USB_EP_ATTR_BULK,        USB_DIR_IN,     64, ID_UNASSIGNED},
     {0x1,  USB_EP_ATTR_BULK,        USB_DIR_OUT,    64, ID_UNASSIGNED},
+#endif
     {0x2,  USB_EP_ATTR_INT,         USB_DIR_IN,     64, ID_UNASSIGNED},
     {0x2,  USB_EP_ATTR_INT,         USB_DIR_OUT,    64, ID_UNASSIGNED},
     {0x3,  USB_EP_ATTR_BULK,        USB_DIR_IN,     64, ID_UNASSIGNED},

bsp/stm32/stm32l475-atk-pandora/board/Kconfig

@@ -78,7 +78,35 @@ menu "Onboard Peripheral Drivers"
             bool "Enable Audio Record"
             default n
         endif
-        
+
+    menuconfig BSP_USING_USB_AUDIO
+        bool "Enable USB Audio"
+        select RT_USB_DEVICE_AUDIO
+        select BSP_USING_USBD
+        select BSP_USBD_EP_ISOC
+        select BSP_USING_AUDIO
+        default n
+
+        if BSP_USING_USB_AUDIO
+            config BSP_USING_USB_AUDIO_SPEAKER
+            bool "Enable USB Audio Spearker"
+            select RT_USB_DEVICE_AUDIO_SPEAKER
+            select BSP_USING_AUDIO_PLAY
+            default y
+
+            config BSP_USING_USB_AUDIO_MIC
+            bool "Enable USB Audio Mic"
+            select RT_USB_DEVICE_AUDIO_MIC
+            select BSP_USING_AUDIO_RECORD
+            default n
+
+            config _BSP_USB_DEVICE_COMPOSITE
+            bool
+            select RT_USB_DEVICE_COMPOSITE
+            default y
+            depends on BSP_USING_USB_AUDIO_SPEAKER && BSP_USING_USB_AUDIO_MIC
+        endif
+
     config BSP_USING_WIFI
             bool "Enable WiFi (AP6181)"
             select PKG_USING_WLAN_WICED
@@ -352,6 +380,11 @@ menu "On-chip Peripheral Drivers"
         select RT_USING_USB_DEVICE
         default n
 
+    config BSP_USBD_EP_ISOC
+        bool
+        default n
+        depends on BSP_USING_USBD
+
     config BSP_USING_STM32_SDIO
             bool "Enable SDIO"
             select RT_USING_SDIO