diff --git a/arch/arm/cortex_m/src/fault.c b/arch/arm/cortex_m/src/fault.c
index 704cdaf55e8250de368d811347df0d0dab9d9b2e..eb33ab69d40969c7e4fb7e5dda2952aca72ea4d0 100644
--- a/arch/arm/cortex_m/src/fault.c
+++ b/arch/arm/cortex_m/src/fault.c
@@ -298,12 +298,12 @@ VOID BackTraceSub(UINTPTR sp)
     }
 
     while ((stackPointer < stackBottom) && (count < OS_MAX_BACKTRACE)) {
-        if (((*(UINT32 *)stackPointer) >= (UINT32)(text_start)) &&
-            ((*(UINT32 *)stackPointer) <= (UINT32)(text_end)) &&
-            (IS_ALIGNED(*((UINT32 *)stackPointer - 1), THUM_OFFSET))) {
+        if ((*(UINT32 *)stackPointer >= (UINT32)text_start) &&
+            (*(UINT32 *)stackPointer <= (UINT32)text_end) &&
+            IS_ALIGNED(*(UINT32 *)stackPointer - 1, THUM_OFFSET)) {
 
             /* Get the entry address of current function. */
-            UINTPTR checkBL = CalculateTargetAddress (*(UINT32 *)stackPointer - 1);
+            UINTPTR checkBL = CalculateTargetAddress(*(UINT32 *)stackPointer - 1);
             if ((checkBL == 0) || (checkBL == tmpJump)) {
                 stackPointer += STACK_OFFSET;
                 continue;
diff --git a/targets/Cloud_STM32F429IGTx_FIRE/Src/tim.c b/targets/Cloud_STM32F429IGTx_FIRE/Src/tim.c
index 14010089e975794e6984a74a520f55496cb56506..c2c9a4b3fafb0409fee5b04663fb8d82c5628e19 100644
--- a/targets/Cloud_STM32F429IGTx_FIRE/Src/tim.c
+++ b/targets/Cloud_STM32F429IGTx_FIRE/Src/tim.c
@@ -113,8 +113,8 @@ UINT64 Timer3Getcycle(VOID)
 
     if (swCycles <= bacCycle) {
         cycleTimes++;
-        bacCycle = swCycles;
     }
+    bacCycle = swCycles;
     return swCycles + cycleTimes * TIMER3_RELOAD;
 }
 
@@ -130,7 +130,9 @@ VOID StmTimerHwiCreate(VOID)
     ret = LOS_HwiCreate(TIM_IRQ, 0, 0, TIM3_IRQHandler, 0); // 16: cortex-m irq num shift
     if (ret != 0) {
         printf("ret of TIM3 LOS_HwiCreate = %#x\n", ret);
+        return;
     }
+    HAL_TIM_Base_Start_IT(&htim3);
 }
 
 UINT64 StmGetTimerCycles(Timer_t num)
diff --git a/targets/STM32F072_Nucleo/Src/tim.c b/targets/STM32F072_Nucleo/Src/tim.c
index 7e51a0b641da5376710f823e75902b109cf49d0b..be4f62b450155d5ecc853fadb001599ff9553686 100644
--- a/targets/STM32F072_Nucleo/Src/tim.c
+++ b/targets/STM32F072_Nucleo/Src/tim.c
@@ -133,8 +133,8 @@ UINT64 Timer3Getcycle(VOID)
 
     if (swCycles <= bacCycle) {
         cycleTimes++;
-        bacCycle = swCycles;
     }
+    bacCycle = swCycles;
     return swCycles + cycleTimes * TIMER3_RELOAD;
 }
 
@@ -150,7 +150,9 @@ VOID StmTimerHwiCreate(VOID)
     ret = LOS_HwiCreate(TIM_IRQ, 0, 0, TIM3_IRQHandler, 0); // 16: cortex-m irq num shift
     if (ret != 0) {
         printf("ret of TIM3 LOS_HwiCreate = %#x\n", ret);
+        return;
     }
+    HAL_TIM_Base_Start_IT(&htim3);
 }
 
 UINT64 StmGetTimerCycles(Timer_t num)
diff --git a/targets/STM32F103_FIRE_Arbitrary/Src/tim.c b/targets/STM32F103_FIRE_Arbitrary/Src/tim.c
index 5247c756578090117217ec098337770fb7f54b16..76c52cf192a3bd2878415183b1023e3350ad35ac 100644
--- a/targets/STM32F103_FIRE_Arbitrary/Src/tim.c
+++ b/targets/STM32F103_FIRE_Arbitrary/Src/tim.c
@@ -35,17 +35,14 @@ void MX_TIM3_Init(void)
     TIM_MasterConfigTypeDef sMasterConfig = { 0 };
 
     htim3.Instance = TIM3;
-    htim3.Init.Prescaler = 3600 - 1;
+    htim3.Init.Prescaler = 7200 - 1;
     htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
     htim3.Init.Period = 50000 - 1;
     htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
     if (HAL_TIM_Base_Init(&htim3) != HAL_OK) {
         Error_Handler();
     }
-    sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_ETRMODE2;
-    sClockSourceConfig.ClockPolarity = TIM_CLOCKPOLARITY_NONINVERTED;
-    sClockSourceConfig.ClockPrescaler = TIM_CLOCKPRESCALER_DIV1;
-    sClockSourceConfig.ClockFilter = 0;
+    sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
     if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK) {
         Error_Handler();
     }
@@ -58,7 +55,6 @@ void MX_TIM3_Init(void)
 
 void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *tim_baseHandle)
 {
-    GPIO_InitTypeDef GPIO_InitStruct = { 0 };
     if (tim_baseHandle->Instance == TIM3) {
         /* USER CODE BEGIN TIM3_MspInit 0 */
 
@@ -66,15 +62,6 @@ void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *tim_baseHandle)
         /* TIM3 clock enable */
         __HAL_RCC_TIM3_CLK_ENABLE();
 
-        __HAL_RCC_GPIOD_CLK_ENABLE();
-        /* *TIM3 GPIO Configuration
-        PD2     ------> TIM3_ETR
-        */
-        GPIO_InitStruct.Pin = GPIO_PIN_2;
-        GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
-        GPIO_InitStruct.Pull = GPIO_NOPULL;
-        HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
-
         /* TIM3 interrupt Init */
         HAL_NVIC_SetPriority(TIM3_IRQn, 0, 0);
         HAL_NVIC_EnableIRQ(TIM3_IRQn);
@@ -93,11 +80,6 @@ void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef *tim_baseHandle)
         /* Peripheral clock disable */
         __HAL_RCC_TIM3_CLK_DISABLE();
 
-        /* *TIM3 GPIO Configuration
-        PD2     ------> TIM3_ETR
-        */
-        HAL_GPIO_DeInit(GPIOD, GPIO_PIN_2);
-
         /* TIM3 interrupt Deinit */
         HAL_NVIC_DisableIRQ(TIM3_IRQn);
         /* USER CODE BEGIN TIM3_MspDeInit 1 */
@@ -129,8 +111,8 @@ UINT64 Timer3Getcycle(VOID)
 
     if (swCycles <= bacCycle) {
         cycleTimes++;
-        bacCycle = swCycles;
     }
+    bacCycle = swCycles;
     return swCycles + cycleTimes * TIMER3_RELOAD;
 }
 
@@ -146,7 +128,9 @@ VOID StmTimerHwiCreate(VOID)
     ret = LOS_HwiCreate(TIM_IRQ, 0, 0, TIM3_IRQHandler, 0); // 16: cortex-m irq num shift
     if (ret != 0) {
         printf("ret of TIM3 LOS_HwiCreate = %#x\n", ret);
+        return;
     }
+    HAL_TIM_Base_Start_IT(&htim3);
 }
 
 UINT64 StmGetTimerCycles(Timer_t num)
diff --git a/targets/STM32F407_ATK_Explorer/Src/tim.c b/targets/STM32F407_ATK_Explorer/Src/tim.c
index 4f297ae11810ca3cdbbdd44aa24a9df0cc035f3c..13f165fac63b6c90a2da8d984c5308f4c17447ad 100644
--- a/targets/STM32F407_ATK_Explorer/Src/tim.c
+++ b/targets/STM32F407_ATK_Explorer/Src/tim.c
@@ -43,10 +43,7 @@ void MX_TIM3_Init(void)
     if (HAL_TIM_Base_Init(&htim3) != HAL_OK) {
         Error_Handler();
     }
-    sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_ETRMODE2;
-    sClockSourceConfig.ClockPolarity = TIM_CLOCKPOLARITY_NONINVERTED;
-    sClockSourceConfig.ClockPrescaler = TIM_CLOCKPRESCALER_DIV1;
-    sClockSourceConfig.ClockFilter = 0;
+    sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
     if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK) {
         Error_Handler();
     }
@@ -59,25 +56,12 @@ void MX_TIM3_Init(void)
 
 void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *tim_baseHandle)
 {
-    GPIO_InitTypeDef GPIO_InitStruct = { 0 };
     if (tim_baseHandle->Instance == TIM3) {
         /* USER CODE BEGIN TIM3_MspInit 0 */
 
         /* USER CODE END TIM3_MspInit 0 */
         /* TIM3 clock enable */
         __HAL_RCC_TIM3_CLK_ENABLE();
-
-        __HAL_RCC_GPIOD_CLK_ENABLE();
-        /* *TIM3 GPIO Configuration
-        PD2     ------> TIM3_ETR
-        */
-        GPIO_InitStruct.Pin = GPIO_PIN_2;
-        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
-        GPIO_InitStruct.Pull = GPIO_NOPULL;
-        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
-        GPIO_InitStruct.Alternate = GPIO_AF2_TIM3;
-        HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
-
         /* USER CODE BEGIN TIM3_MspInit 1 */
 
         /* USER CODE END TIM3_MspInit 1 */
@@ -92,12 +76,6 @@ void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef *tim_baseHandle)
         /* USER CODE END TIM3_MspDeInit 0 */
         /* Peripheral clock disable */
         __HAL_RCC_TIM3_CLK_DISABLE();
-
-        /* *TIM3 GPIO Configuration
-        PD2     ------> TIM3_ETR
-        */
-        HAL_GPIO_DeInit(GPIOD, GPIO_PIN_2);
-
         /* USER CODE BEGIN TIM3_MspDeInit 1 */
 
         /* USER CODE END TIM3_MspDeInit 1 */
@@ -128,8 +106,8 @@ UINT64 Timer3Getcycle(VOID)
 
     if (swCycles <= bacCycle) {
         cycleTimes++;
-        bacCycle = swCycles;
     }
+    bacCycle = swCycles;
     return swCycles + cycleTimes * TIMER3_RELOAD;
 }
 
@@ -145,7 +123,9 @@ VOID StmTimerHwiCreate(VOID)
     ret = LOS_HwiCreate(TIM_IRQ, 0, 0, TIM3_IRQHandler, 0); // 16: cortex-m irq num shift
     if (ret != 0) {
         printf("ret of TIM3 LOS_HwiCreate = %#x\n", ret);
+        return;
     }
+    HAL_TIM_Base_Start_IT(&htim3);
 }
 
 UINT64 StmGetTimerCycles(Timer_t num)
diff --git a/targets/STM32F769IDISCOVERY/Src/tim.c b/targets/STM32F769IDISCOVERY/Src/tim.c
index 57364f754730f8c098cc4fd7c650c513383d2ebd..49d304553830358624d20ca514242d91013b5a1a 100644
--- a/targets/STM32F769IDISCOVERY/Src/tim.c
+++ b/targets/STM32F769IDISCOVERY/Src/tim.c
@@ -105,8 +105,8 @@ UINT64 Timer3Getcycle(VOID)
 
     if (swCycles <= bacCycle) {
         cycleTimes++;
-        bacCycle = swCycles;
     }
+    bacCycle = swCycles;
     return swCycles + cycleTimes * TIMER3_RELOAD;
 }
 
@@ -122,7 +122,9 @@ VOID StmTimerHwiCreate(VOID)
     ret = LOS_HwiCreate(TIM_IRQ, 0, 0, TIM3_IRQHandler, 0); // 16: cortex-m irq num shift
     if (ret != 0) {
         printf("ret of TIM3 LOS_HwiCreate = %#x\n", ret);
+        return;
     }
+    HAL_TIM_Base_Start_IT(&htim3);
 }
 
 UINT64 StmGetTimerCycles(Timer_t num)
diff --git a/targets/STM32L431_BearPi/Src/tim.c b/targets/STM32L431_BearPi/Src/tim.c
index 06e5bf7fd9d91013d18a8dea1004f2f1038c1b12..2adf9de560f3d53e39be685047ca68be8342e917 100644
--- a/targets/STM32L431_BearPi/Src/tim.c
+++ b/targets/STM32L431_BearPi/Src/tim.c
@@ -106,8 +106,8 @@ UINT64 Timer7Getcycle(VOID)
 
     if (swCycles <= bacCycle) {
         cycleTimes++;
-        bacCycle = swCycles;
     }
+    bacCycle = swCycles;
     return swCycles + cycleTimes * TIMER7_RELOAD;
 }
 
@@ -123,7 +123,9 @@ VOID StmTimerHwiCreate(VOID)
     ret = LOS_HwiCreate(TIM_IRQ, 0, 0, TIM7_IRQHandler, 0); // 16: cortex-m irq num shift
     if (ret != 0) {
         printf("ret of TIM7 LOS_HwiCreate = %#x\n", ret);
+        return;
     }
+    HAL_TIM_Base_Start_IT(&htim7);
 }
 
 UINT64 StmGetTimerCycles(Timer_t num)