diff --git a/board/STM8L052R8T6/USER/main.c b/board/STM8L052R8T6/USER/main.c
index 0edb4729..eea2cc79 100644
--- a/board/STM8L052R8T6/USER/main.c
+++ b/board/STM8L052R8T6/USER/main.c
@@ -5,37 +5,34 @@
 #include "rtc.h"
 #include "tim.h"
 
+// this is a stm8 rtc demo UART1 print,the baud rate is 57600.
+// LED GPIOB0
 
-//this is a stm8 rtc demo UART1 print,the baud rate is 57600.
-//LED GPIOB0
-
-//Init LED IO
+// Init LED IO
 void LED_GPIO_Init(void)
 {
 
     GPIO_Init(GPIOB, GPIO_Pin_0, GPIO_Mode_Out_PP_Low_Slow);
 }
 
-//set the GPIOB0 Pin to high
+// set the GPIOB0 Pin to high
 void LED_On(void)
 {
     GPIO_SetBits(GPIOB, GPIO_Pin_0);
 }
 
-//set the GPIOB0 Pin to low
+// set the GPIOB0 Pin to low
 void LED_Off(void)
 {
     GPIO_ResetBits(GPIOB, GPIO_Pin_0);
 }
 
-//About 1 second, not exactly, just for demonstration purposes
+// About 1 second, not exactly, just for demonstration purposes
 void Delay(unsigned int time)
 {
     unsigned int i;
-    while (time--)
-    {
-        for (i = 300; i > 0; i--)
-        {
+    while (time--) {
+        for (i = 300; i > 0; --i) {
             asm("nop");
         }
     }
@@ -60,45 +57,6 @@ void disp_rtc(void)
     UART1_Send_String(" \r\n");
 }
 
-#if 0
-int main(void)
-{
-    LED_GPIO_Init();
-    LED_On();
-
-    UART1_Init(57600); //Init the UART1 and the baud rate is 57600
-    UART1_Send_String("RTC Demo Code\r\n");
-
-    RTC_Setting_Init(); //Init RTC
-
-    while (1)
-    {
-
-        RTC_Get_Time();
-        UART1_Send_String("Current Time:");
-        UART1_Send_Dec(clock.cYear, 2); //YY-MM-DD
-        UART1_Send_String("-");
-        UART1_Send_Dec(clock.cMonth, 2);
-        UART1_Send_String("-");
-        UART1_Send_Dec(clock.cDay, 2);
-
-        UART1_Send_String(" "); //HH:MM:SS
-        UART1_Send_Dec(clock.cHour, 2);
-        UART1_Send_String(":");
-        UART1_Send_Dec(clock.cMinute, 2);
-        UART1_Send_String(":");
-        UART1_Send_Dec(clock.cSecond, 2);
-        UART1_Send_String(" ");
-
-        LED_On();
-        Delay(200);
-        LED_Off();
-        Delay(200);
-    }
-}
-
-#endif
-
 void task1_entry(void *arg)
 {
     while (1) {
@@ -139,12 +97,11 @@ int main(void)
                         4,
                         task1_stack, sizeof(task1_stack),
                         0);
-#if 1
+
     tos_task_create(&task2, "task2", task2_entry, NULL,
                         4,
                         task2_stack, sizeof(task2_stack),
                         0);
-#endif
 
     tos_knl_start();