diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_usbd.c b/bsp/stm32/libraries/HAL_Drivers/drv_usbd.c
index 9c29966ed0..182dd3a2d4 100644
--- a/bsp/stm32/libraries/HAL_Drivers/drv_usbd.c
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_usbd.c
@@ -28,12 +28,22 @@ static struct ep_id _ep_pool[] =
 #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},
+    {0x2,  USB_EP_ATTR_BULK,        USB_DIR_IN,     64, ID_UNASSIGNED},
+    {0x2,  USB_EP_ATTR_BULK,        USB_DIR_OUT,    64, ID_UNASSIGNED},
     {0x3,  USB_EP_ATTR_BULK,        USB_DIR_IN,     64, ID_UNASSIGNED},
-#if !defined(SOC_SERIES_STM32F1)
     {0x3,  USB_EP_ATTR_BULK,        USB_DIR_OUT,    64, ID_UNASSIGNED},
+#endif
+    {0x4,  USB_EP_ATTR_INT,         USB_DIR_IN,     64, ID_UNASSIGNED},
+    {0x4,  USB_EP_ATTR_INT,         USB_DIR_OUT,    64, ID_UNASSIGNED},
+    {0x5,  USB_EP_ATTR_INT,         USB_DIR_IN,     64, ID_UNASSIGNED},
+    {0x5,  USB_EP_ATTR_INT,         USB_DIR_OUT,    64, ID_UNASSIGNED},
+    {0x6,  USB_EP_ATTR_INT,         USB_DIR_IN,     64, ID_UNASSIGNED},
+    {0x6,  USB_EP_ATTR_INT,         USB_DIR_OUT,    64, ID_UNASSIGNED},
+    {0x7,  USB_EP_ATTR_BULK,        USB_DIR_IN,     64, ID_UNASSIGNED},
+    {0x8,  USB_EP_ATTR_BULK,        USB_DIR_IN,     64, ID_UNASSIGNED},
+    {0x9,  USB_EP_ATTR_BULK,        USB_DIR_IN,     64, ID_UNASSIGNED},
+#if !defined(SOC_SERIES_STM32F1)
+    {0x9,  USB_EP_ATTR_BULK,        USB_DIR_OUT,    64, ID_UNASSIGNED},
 #endif
     {0xFF, USB_EP_ATTR_TYPE_MASK,   USB_DIR_MASK,   0,  ID_ASSIGNED  },
 };
diff --git a/components/drivers/usb/usbdevice/class/cdc_vcom.c b/components/drivers/usb/usbdevice/class/cdc_vcom.c
index df5e03f54c..91b49d47de 100644
--- a/components/drivers/usb/usbdevice/class/cdc_vcom.c
+++ b/components/drivers/usb/usbdevice/class/cdc_vcom.c
@@ -100,7 +100,7 @@ static struct udevice_descriptor dev_desc =
     USB_CLASS_CDC,              //bDeviceClass;
     0x00,                       //bDeviceSubClass;
     0x00,                       //bDeviceProtocol;
-    CDC_MAX_PACKET_SIZE,          //bMaxPacketSize0;
+    CDC_MAX_PACKET_SIZE,        //bMaxPacketSize0;
     _VENDOR_ID,                 //idVendor;
     _PRODUCT_ID,                //idProduct;
     USB_BCD_DEVICE,             //bcdDevice;
@@ -498,6 +498,10 @@ static rt_err_t _function_enable(ufunction_t func)
     data->ep_out->buffer = rt_malloc(CDC_RX_BUFSIZE);
     RT_ASSERT(data->ep_out->buffer != RT_NULL);
 
+#ifdef RT_USING_SERIAL_V2
+    data->serial.serial_rx = &data->rx_ringbuffer;
+#endif
+
     data->ep_out->request.buffer = data->ep_out->buffer;
     data->ep_out->request.size = EP_MAXPACKET(data->ep_out);
 
@@ -882,10 +886,15 @@ static void vcom_tx_thread_entry(void* parameter)
             if (!data->connected)
             {
                 if(data->serial.parent.open_flag &
+#ifdef RT_USING_SERIAL_V1
 #ifndef VCOM_TX_USE_DMA
                          RT_DEVICE_FLAG_INT_TX
 #else
                          RT_DEVICE_FLAG_DMA_TX
+#endif
+#endif
+#ifdef RT_USING_SERIAL_V2
+                         RT_DEVICE_FLAG_TX_BLOCKING
 #endif
                 )
                 {
@@ -911,10 +920,15 @@ static void vcom_tx_thread_entry(void* parameter)
                 RT_DEBUG_LOG(RT_DEBUG_USB, ("vcom tx timeout\n"));
             }
             if(data->serial.parent.open_flag &
+#ifdef RT_USING_SERIAL_V1
 #ifndef VCOM_TX_USE_DMA
                          RT_DEVICE_FLAG_INT_TX
 #else
                          RT_DEVICE_FLAG_DMA_TX
+#endif
+#endif
+#ifdef RT_USING_SERIAL_V2
+                         RT_DEVICE_FLAG_TX_BLOCKING
 #endif
             )
             {