diff --git a/exp2/Core/Inc/variable.h b/exp2/Core/Inc/variable.h
index ca1c8fb..55d385e 100644
--- a/exp2/Core/Inc/variable.h
+++ b/exp2/Core/Inc/variable.h
@@ -9,6 +9,8 @@ extern "C" {
 typedef struct {
     uint8_t mMilSecCount;           // 毫秒计数
     uint8_t bTenMilSecOk;           // 10毫秒标志位
+    uint8_t mTenMilSecCount;        // 10毫秒计数
+    uint8_t bHundredMilSecOk;       // 100毫秒标志位
     uint8_t mTimeCount;             // 秒计数
     uint8_t bTimeOk;                // 秒标志位
 } stSysTickTimer;
diff --git a/exp2/Core/Src/main.c b/exp2/Core/Src/main.c
index 1cf3dbf..a5c334b 100644
--- a/exp2/Core/Src/main.c
+++ b/exp2/Core/Src/main.c
@@ -104,7 +104,9 @@ int main(void)
     if (sSysTickTimer.bTimeOk) {
       sSysTickTimer.bTimeOk = 0;
       HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);
-      
+    }
+    if (sSysTickTimer.bHundredMilSecOk) {
+      sSysTickTimer.bHundredMilSecOk = 0;
       HAL_GPIO_WritePin(FlashLeds_GPIO_Port, nShift, GPIO_PIN_SET);
 
 
diff --git a/exp2/Core/Src/stm32g4xx_it.c b/exp2/Core/Src/stm32g4xx_it.c
index 0be82fa..76a8846 100644
--- a/exp2/Core/Src/stm32g4xx_it.c
+++ b/exp2/Core/Src/stm32g4xx_it.c
@@ -192,9 +192,13 @@ void SysTick_Handler(void)
   if (++sSysTickTimer.mMilSecCount >= 10) {
     sSysTickTimer.mMilSecCount = 0;
     sSysTickTimer.bTenMilSecOk = 1;
-    if (++sSysTickTimer.mTimeCount >= 100) {
-      sSysTickTimer.mTimeCount = 0;
-      sSysTickTimer.bTimeOk = 1;
+    if (++sSysTickTimer.mTenMilSecCount >= 10) {
+      sSysTickTimer.mTenMilSecCount = 0;
+      sSysTickTimer.bHundredMilSecOk = 1;
+      if (++sSysTickTimer.mTimeCount >= 10) {
+        sSysTickTimer.mTimeCount = 0;
+        sSysTickTimer.bTimeOk = 1;
+      }
     }
   }
   /* USER CODE END SysTick_IRQn 1 */