diff --git a/source/bsp/bsp_config.h b/source/bsp/bsp_config.h
index bff21ce..f337322 100644
--- a/source/bsp/bsp_config.h
+++ b/source/bsp/bsp_config.h
@@ -81,9 +81,9 @@
 	#define D_uart0_BRT 	BRT_115200
 	#define D_uart0_SBIT 	SBIT_1
 	#define D_PIN_UART0		PIN_UART0_Rxd_30_Txd_31  //RXD, TXD
-	#define D_uart2_BRT 	BRT_115200
+	#define D_uart2_BRT 	BRT_9600
 	#define D_PIN_UART2 	PIN_UART2_Rxd_10_Txd_11	//RXD2, TXD2
-	#define D_uart3_BRT 	BRT_115200
+	#define D_uart3_BRT 	BRT_9600
 	#define D_PIN_UART3 	PIN_UART3_Rxd_00_Txd_01 //RXD3, TXD3
 	#define D_uart4_BRT 	BRT_115200
 	#define D_PIN_UART4 	PIN_UART4_Rxd_02_Txd_03 //RXD4, TXD4
diff --git a/source/msp/UART2.c b/source/msp/UART2.c
index c3342bd..a08e6f6 100644
--- a/source/msp/UART2.c
+++ b/source/msp/UART2.c
@@ -12,11 +12,20 @@ void L0_uart2_init(void)
 	AUXR |= 0x10;				   
 
 #elif (MainFre_22M == D_sys_MainFre) // 9600bps@22.1184MHz
+	#if (D_uart2_BRT == BRT_115200)
+	S2CON = 0x50;		//8位数据,可变波特率
+	AUXR |= 0x04;		//定时器时钟1T模式
+	T2L = 0xD0;			//设置定时初始值
+	T2H = 0xFF;			//设置定时初始值
+	AUXR |= 0x10;		//定时器2开始计时
+
+	#elif(D_uart2_BRT == BRT_9600)
 	S2CON = 0x50; // 8位数据,可变波特率
 	AUXR |= 0x04; //定时器时钟1T模式
 	T2L = 0xC0;	  //设置定时初始值
 	T2H = 0xFD;	  //设置定时初始值
 	AUXR |= 0x10; //定时器2开始计时
+	#endif
 
 #endif
 }
diff --git a/source/msp/UART3.c b/source/msp/UART3.c
index 917189c..67d17fb 100644
--- a/source/msp/UART3.c
+++ b/source/msp/UART3.c
@@ -12,6 +12,7 @@ void L0_uart3_init(void)
 	T4T3M |= 0x08;		//启动定时器3
 
 #elif (MainFre_22M == D_sys_MainFre)	//115200bps@22.1184MHz
+	#if (D_uart3_BRT == BRT_115200)
 	S3CON = 0x10;		//8位数据,可变波特率
 	S3CON |= 0x40;		//串口3选择定时器3为波特率发生器
 	T4T3M &= 0xFD;		//定时器时钟12T模式
@@ -19,6 +20,16 @@ void L0_uart3_init(void)
 	T3H = 0xFF;			//设置定时初始值
 	T4T3M |= 0x08;		//定时器3开始计时
 
+	#elif (D_uart3_BRT == BRT_9600)
+	S3CON = 0x10;		//8位数据,可变波特率
+	S3CON |= 0x40;		//串口3选择定时器3为波特率发生器
+	T4T3M |= 0x02;		//定时器时钟1T模式
+	T3L = 0xC0;			//设置定时初始值
+	T3H = 0xFD;			//设置定时初始值
+	T4T3M |= 0x08;		//定时器3开始计时
+
+	#endif
+
 #endif
 
 }
diff --git a/source/msp/UART4.C b/source/msp/UART4.C
index 9b4c134..17bc793 100644
--- a/source/msp/UART4.C
+++ b/source/msp/UART4.C
@@ -23,13 +23,23 @@ void L0_uart4_init(void)//115200bps@11.0592MHz
 #endif
 	
 	
-#elif (MainFre_22M == D_sys_MainFre)	//9600bps@22.1184MHz
+#elif (MainFre_22M == D_sys_MainFre)	
+	#if (D_uart4_BRT == BRT_115200)
+	S4CON = 0x10;		//8位数据,可变波特率
+	S4CON |= 0x40;		//串口4选择定时器4为波特率发生器
+	T4T3M |= 0x20;		//定时器时钟1T模式
+	T4L = 0xD0;			//设置定时初始值
+	T4H = 0xFF;			//设置定时初始值
+	T4T3M |= 0x80;		//定时器4开始计时
+
+	#elif (D_uart4_BRT == BRT_9600)	//9600bps@22.1184MHz
 	S4CON = 0x10;		//8位数据,可变波特率
 	S4CON |= 0x40;		//串口4选择定时器4为波特率发生器
 	T4T3M |= 0x20;		//定时器时钟1T模式
 	T4L = 0xC0;			//设置定时初始值
 	T4H = 0xFD;			//设置定时初始值
 	T4T3M |= 0x80;		//定时器4开始计时
+	#endif
 #endif
 }