diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/cmcng.h b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/cmcng.h
index d14c76b..65bf887 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/cmcng.h
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/cmcng.h
@@ -19,7 +19,7 @@
 #define     HARDWARE_VER_SUB          1
 
 
-#define     BUFF_STACK_SIZE         512 //128
+#define     BUFF_STACK_SIZE         64
 
 #define             MAX_UART_TXRX_LEN               32
 
@@ -91,15 +91,6 @@ extern Pkg_Uart g_pkg_uart_1;
 extern Pkg_Uart g_pkg_uart_2;
 
 
-#define  RX_BUFFER_LEN              BUFF_STACK_SIZE
-
-typedef struct
-{
-    volatile uint8_t DMA_USE_BUFFER;
-    uint8_t          Rx_Buffer[2][RX_BUFFER_LEN];
-
-} USART_DMA_UNIT;
-
 
 
 typedef struct _DBN_BLE_STATE_