diff --git a/bspMCU/bsp_uart.c b/bspMCU/bsp_uart.c
index 4a809e7..bc53450 100644
--- a/bspMCU/bsp_uart.c
+++ b/bspMCU/bsp_uart.c
@@ -40,7 +40,7 @@ static void bsp_uart_set_baudrate(UART_HandleTypeDef *_pUartHandle, uint32_t _ui
     }
 }
 
-TUartUserData *UART_userdata_init(int _iID, uint32_t _uiBaudRate, uint32_t _uiSize)
+TUartUserData *UART_userdata_init(int _iID, int32_t _uiBaudRate, uint32_t _uiSize)
 {
     if (_iID < 0 || _iID >= (sizeof(g_ptUartTab)/sizeof(g_ptUartTab[0]))) 
         return NULL;
diff --git a/bspMCU/include/bsp_uart.h b/bspMCU/include/bsp_uart.h
index bd28bb9..794aedc 100644
--- a/bspMCU/include/bsp_uart.h
+++ b/bspMCU/include/bsp_uart.h
@@ -32,7 +32,7 @@ typedef struct
 #endif
 }TUartUserData;
 
-extern TUartUserData *UART_userdata_init(int _iID, uint32_t _uiBaudRate, uint32_t _uiSize);
+extern TUartUserData *UART_userdata_init(int _iID, int32_t _uiBaudRate, uint32_t _uiSize);
 extern void UART_IT_init(TComCtrl *_ptComCtrl);
 extern void UART_DMA_RX_IRQHandler(TComCtrl *_ptComCtrl);
 extern void UART_RX_IRQHandler(TComCtrl *_ptComCtrl);