diff --git a/.platformio/packages/framework-cmsis-at32f40/libraries/AT32_USB-FS-Device_Driver/src/usb_init.c b/.platformio/packages/framework-cmsis-at32f40/libraries/AT32_USB-FS-Device_Driver/src/usb_init.c
index 673abe3..a17a70b 100644
--- a/.platformio/packages/framework-cmsis-at32f40/libraries/AT32_USB-FS-Device_Driver/src/usb_init.c
+++ b/.platformio/packages/framework-cmsis-at32f40/libraries/AT32_USB-FS-Device_Driver/src/usb_init.c
@@ -88,6 +88,8 @@ void USB_BluePill_Reenumerate()
   */
 void USB_Init(void)
 {
+  /*if use USB SRAM_Size = 768 Byte, default is 512 Byte*/
+  Set_USB768ByteMode();
   //reenumerate();
   //USB_BluePill_Reenumerate();
   pInformation = &Device_Info;