diff --git a/Core/Src/gpio.c b/Core/Src/gpio.c
index 18e2ad1..8599df8 100644
--- a/Core/Src/gpio.c
+++ b/Core/Src/gpio.c
@@ -57,8 +57,8 @@ void MX_GPIO_Init(void)
   HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
   HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
   HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-  //__HAL_RCC_GPIOA_CLK_DISABLE();
-  //__HAL_RCC_GPIOB_CLK_DISABLE();
+  __HAL_RCC_GPIOA_CLK_DISABLE();
+  __HAL_RCC_GPIOB_CLK_DISABLE();
   __HAL_RCC_GPIOC_CLK_DISABLE();
 
   /*Configure GPIO pin Output Level */
@@ -109,7 +109,7 @@ void MX_GPIO_Init(void)
   GPIO_InitStruct.Pull = GPIO_PULLUP;
   HAL_GPIO_Init(BUT1_GPIO_Port, &GPIO_InitStruct);
 
-
+  __HAL_RCC_GPIOB_CLK_ENABLE();
   /*Configure GPIO pins : TOF_C_INT_Pin */
 #if defined(TOF_1)
   GPIO_InitStruct.Pin = TOF_C_INT_Pin;
diff --git a/Core/Src/main.c b/Core/Src/main.c
index bbadc1e..8be6462 100644
--- a/Core/Src/main.c
+++ b/Core/Src/main.c
@@ -116,6 +116,8 @@ int main(void)
   MX_LoRaWAN_Init();
 
   /* USER CODE BEGIN 2 */
+  HAL_UART_DeInit(&huart2);
+
   vcom_DeInit();
   //HAL_Delay(3000);
 
diff --git a/Core/Src/stm32_lpm_if.c b/Core/Src/stm32_lpm_if.c
index 29e070b..a2044c9 100644
--- a/Core/Src/stm32_lpm_if.c
+++ b/Core/Src/stm32_lpm_if.c
@@ -80,17 +80,19 @@ const struct UTIL_LPM_Driver_s UTIL_PowerDriver =
 
 void PWR_EnterOffMode(void)
 {
-#if 1
+#if 0
 	//HAL_GPIO_WritePin(GPIOB, GPIO_PIN_2, GPIO_PIN_RESET); /* LED OFF */
 	  HAL_SuspendTick();
 	  HAL_UART_DeInit(&huart2);
 	  //LL_PWR_ClearFlag_WU();
-	  __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);
+	  //__HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);
 	  __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
+	  __HAL_PWR_CLEAR_FLAG(PWR_FLAG_LPMODES);
 	  //LL_PWR_ClearFlag_WU();
 	  HAL_PWR_EnterSTANDBYMode();
 #endif
-
+	  HAL_SuspendTick();
+	  HAL_PWR_EnterSTANDBYMode();
 #if 0
 	LED_OFF;
 	HAL_UART_DeInit(&huart2);
@@ -110,7 +112,7 @@ void PWR_ExitOffMode(void)
   /* USER CODE BEGIN ExitOffMode_1 */
 #if 1
 	HAL_ResumeTick();
-	  __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);
+	  //__HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);
 	//HAL_GPIO_WritePin(GPIOB, GPIO_PIN_2, GPIO_PIN_SET); /* LED ON */
 	return;
 #endif
@@ -126,7 +128,11 @@ void PWR_ExitOffMode(void)
 void PWR_EnterStopMode(void)
 {
   /* USER CODE BEGIN EnterStopMode_1 */
-
+	HAL_UART_DeInit(&huart2);
+	vcom_DeInit();
+	HAL_GPIO_DeInit(GPIOA,GPIO_PIN_All);
+	HAL_GPIO_DeInit(GPIOB,GPIO_PIN_All);
+	HAL_GPIO_DeInit(GPIOC,GPIO_PIN_All);
   /* USER CODE END EnterStopMode_1 */
   HAL_SuspendTick();
   /* Clear Status Flag before entering STOP/STANDBY Mode */
diff --git a/Core/Src/sys_app.c b/Core/Src/sys_app.c
index 994787b..466d467 100644
--- a/Core/Src/sys_app.c
+++ b/Core/Src/sys_app.c
@@ -123,6 +123,7 @@ void SystemApp_Init(void)
   UTIL_LPM_Init();
   /* Disable Stand-by mode */
   UTIL_LPM_SetOffMode((1 << CFG_LPM_APPLI_Id), UTIL_LPM_DISABLE);
+  UTIL_LPM_SetOffMode((1 << CFG_LPM_UART_TX_Id), UTIL_LPM_ENABLE);
 
 #if defined (LOW_POWER_DISABLE) && (LOW_POWER_DISABLE == 1)
   /* Disable Stop Mode */