diff --git a/usrc/app/exth2o2_sensor.cpp b/usrc/app/exth2o2_sensor.cpp
index 3b4a03a..c8dca8b 100644
--- a/usrc/app/exth2o2_sensor.cpp
+++ b/usrc/app/exth2o2_sensor.cpp
@@ -14,7 +14,7 @@ ExtH2O2Sensor* ExtH2O2Sensor::ins() {
   static ExtH2O2Sensor instance;
   return &instance;
 }
-void ExtH2O2Sensor::initialize(s) {
+void ExtH2O2Sensor::initialize() {
   H2O2ExtBoard::HUART2_INIT(19200, UART_STOPBITS_2);
   H2O2ExtBoard::HADC1_INIT();
 
diff --git a/usrc/board/hal/h2o2_ext_board.cpp b/usrc/board/hal/h2o2_ext_board.cpp
index ee42ef1..1ad7c8e 100644
--- a/usrc/board/hal/h2o2_ext_board.cpp
+++ b/usrc/board/hal/h2o2_ext_board.cpp
@@ -80,7 +80,7 @@ void H2O2ExtBoard::HUART2_INIT(int baudrate, uint32_t StopBits) {
   GPIO_InitStruct.Pull      = GPIO_NOPULL;
   GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_VERY_HIGH;
   GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
-  HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
+  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
   /* USART2 interrupt Init */
   HAL_NVIC_SetPriority(USART2_IRQn, 5, 0);
diff --git a/usrc/board/hal/large_space_dm_power_ctrl_board.cpp b/usrc/board/hal/large_space_dm_power_ctrl_board.cpp
index 5f2cc0e..c7cc83f 100644
--- a/usrc/board/hal/large_space_dm_power_ctrl_board.cpp
+++ b/usrc/board/hal/large_space_dm_power_ctrl_board.cpp
@@ -85,7 +85,7 @@ void LargeSpaceDmPowerCtrlBoardHal::HUART2_INIT(int baudrate, uint32_t StopBits)
   PD5     ------> USART2_TX
   PD6     ------> USART2_RX
   */
-  GPIO_InitStruct.Pin       = GPIO_PIN_2 | GPIO_PIN_3;
+  GPIO_InitStruct.Pin       = GPIO_PIN_5 | GPIO_PIN_6;
   GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
   GPIO_InitStruct.Pull      = GPIO_NOPULL;
   GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_VERY_HIGH;