diff --git a/targets/TARGET_STM/TARGET_STM32F0/serial_device.c b/targets/TARGET_STM/TARGET_STM32F0/serial_device.c
index 788e15b5804..65d56f65a90 100644
--- a/targets/TARGET_STM/TARGET_STM32F0/serial_device.c
+++ b/targets/TARGET_STM/TARGET_STM32F0/serial_device.c
@@ -281,8 +281,9 @@ void serial_clear(serial_t *obj)
     struct serial_s *obj_s = SERIAL_S(obj);
     UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
 
-    huart->TxXferCount = 0;
-    huart->RxXferCount = 0;
+    /* Clear RXNE and error flags */
+    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->RDR;
+    HAL_UART_ErrorCallback(huart);
 }
 
 void serial_break_set(serial_t *obj)
diff --git a/targets/TARGET_STM/TARGET_STM32F1/serial_device.c b/targets/TARGET_STM/TARGET_STM32F1/serial_device.c
index 849676cd467..eb7a66b7063 100644
--- a/targets/TARGET_STM/TARGET_STM32F1/serial_device.c
+++ b/targets/TARGET_STM/TARGET_STM32F1/serial_device.c
@@ -196,8 +196,9 @@ void serial_clear(serial_t *obj)
     struct serial_s *obj_s = SERIAL_S(obj);
     UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
 
-    huart->TxXferCount = 0;
-    huart->RxXferCount = 0;
+    /* Clear RXNE and error flags */
+    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->DR;
+    HAL_UART_ErrorCallback(huart);
 }
 
 void serial_break_set(serial_t *obj)
@@ -576,7 +577,7 @@ void serial_rx_abort_asynch(serial_t *obj)
 
     // clear flags
     __HAL_UART_CLEAR_FLAG(huart, UART_FLAG_RXNE);
-    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->DR; // Clear errors flag
+    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->DR; // Clear Rx empty flag
 
     // reset states
     huart->RxXferCount = 0;
diff --git a/targets/TARGET_STM/TARGET_STM32F2/serial_device.c b/targets/TARGET_STM/TARGET_STM32F2/serial_device.c
index 2cd79b1044b..4f9d32eaf86 100644
--- a/targets/TARGET_STM/TARGET_STM32F2/serial_device.c
+++ b/targets/TARGET_STM/TARGET_STM32F2/serial_device.c
@@ -253,8 +253,9 @@ void serial_clear(serial_t *obj)
     struct serial_s *obj_s = SERIAL_S(obj);
     UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
 
-    huart->TxXferCount = 0;
-    huart->RxXferCount = 0;
+    /* Clear RXNE and error flags */
+    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->DR; 
+    HAL_UART_ErrorCallback(huart);
 }
 
 void serial_break_set(serial_t *obj)
@@ -659,7 +660,7 @@ void serial_rx_abort_asynch(serial_t *obj)
 
     // clear flags
     __HAL_UART_CLEAR_FLAG(huart, UART_FLAG_RXNE);
-    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->DR; // Clear error flags
+    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->DR; // Clear Rx empty flags
 
     // reset states
     huart->RxXferCount = 0;
diff --git a/targets/TARGET_STM/TARGET_STM32F3/serial_device.c b/targets/TARGET_STM/TARGET_STM32F3/serial_device.c
index b7e47ff2d52..4b7b5087af7 100644
--- a/targets/TARGET_STM/TARGET_STM32F3/serial_device.c
+++ b/targets/TARGET_STM/TARGET_STM32F3/serial_device.c
@@ -228,7 +228,9 @@ void serial_clear(serial_t *obj)
     struct serial_s *obj_s = SERIAL_S(obj);
     UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
 
-    __HAL_UART_SEND_REQ(huart, UART_RXDATA_FLUSH_REQUEST);
+    /* Clear RXNE and error flags */
+    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->RDR;
+    HAL_UART_ErrorCallback(huart);
 }
 
 void serial_break_set(serial_t *obj)
diff --git a/targets/TARGET_STM/TARGET_STM32F4/serial_device.c b/targets/TARGET_STM/TARGET_STM32F4/serial_device.c
index 07e4e505bf6..42296cdd601 100644
--- a/targets/TARGET_STM/TARGET_STM32F4/serial_device.c
+++ b/targets/TARGET_STM/TARGET_STM32F4/serial_device.c
@@ -289,8 +289,9 @@ void serial_clear(serial_t *obj)
     struct serial_s *obj_s = SERIAL_S(obj);
     UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
 
-    huart->TxXferCount = 0;
-    huart->RxXferCount = 0;
+    /* Clear RXNE and error flags */
+    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->DR;
+    HAL_UART_ErrorCallback(huart);
 }
 
 void serial_break_set(serial_t *obj)
diff --git a/targets/TARGET_STM/TARGET_STM32F7/serial_device.c b/targets/TARGET_STM/TARGET_STM32F7/serial_device.c
index 01545d43854..a2a9f9327ac 100644
--- a/targets/TARGET_STM/TARGET_STM32F7/serial_device.c
+++ b/targets/TARGET_STM/TARGET_STM32F7/serial_device.c
@@ -252,8 +252,9 @@ void serial_clear(serial_t *obj)
     struct serial_s *obj_s = SERIAL_S(obj);
     UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
 
-    __HAL_UART_CLEAR_IT(huart, UART_FLAG_TXE);
-    __HAL_UART_CLEAR_IT(huart, UART_FLAG_RXNE);
+    /* Clear RXNE and error flags */
+    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->RDR;
+    HAL_UART_ErrorCallback(huart);
 }
 
 void serial_break_set(serial_t *obj)
diff --git a/targets/TARGET_STM/TARGET_STM32H7/serial_device.c b/targets/TARGET_STM/TARGET_STM32H7/serial_device.c
index e29634334ae..7acdfc8f64a 100644
--- a/targets/TARGET_STM/TARGET_STM32H7/serial_device.c
+++ b/targets/TARGET_STM/TARGET_STM32H7/serial_device.c
@@ -265,8 +265,9 @@ void serial_clear(serial_t *obj)
     struct serial_s *obj_s = SERIAL_S(obj);
     UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
 
-    __HAL_UART_CLEAR_IT(huart, UART_FLAG_TXE);
-    __HAL_UART_CLEAR_IT(huart, UART_FLAG_RXNE);
+    /* Clear RXNE and error flags */
+    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->RDR;
+    HAL_UART_ErrorCallback(huart);
 }
 
 void serial_break_set(serial_t *obj)
diff --git a/targets/TARGET_STM/TARGET_STM32L0/serial_device.c b/targets/TARGET_STM/TARGET_STM32L0/serial_device.c
index 2345e585483..3df454d63b5 100644
--- a/targets/TARGET_STM/TARGET_STM32L0/serial_device.c
+++ b/targets/TARGET_STM/TARGET_STM32L0/serial_device.c
@@ -222,8 +222,9 @@ void serial_clear(serial_t *obj)
     struct serial_s *obj_s = SERIAL_S(obj);
     UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
 
-    huart->TxXferCount = 0;
-    huart->RxXferCount = 0;
+    /* Clear RXNE and error flags */
+    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->RDR;
+    HAL_UART_ErrorCallback(huart);
 }
 
 void serial_break_set(serial_t *obj)
diff --git a/targets/TARGET_STM/TARGET_STM32L1/serial_device.c b/targets/TARGET_STM/TARGET_STM32L1/serial_device.c
index 743ce4815db..5ec25dfb24c 100644
--- a/targets/TARGET_STM/TARGET_STM32L1/serial_device.c
+++ b/targets/TARGET_STM/TARGET_STM32L1/serial_device.c
@@ -222,8 +222,9 @@ void serial_clear(serial_t *obj)
     struct serial_s *obj_s = SERIAL_S(obj);
     UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
 
-    huart->TxXferCount = 0;
-    huart->RxXferCount = 0;
+    /* Clear RXNE and error flags */
+    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->DR;
+    HAL_UART_ErrorCallback(huart);
 }
 
 void serial_break_set(serial_t *obj)
diff --git a/targets/TARGET_STM/TARGET_STM32L4/serial_device.c b/targets/TARGET_STM/TARGET_STM32L4/serial_device.c
index 594a13e8ad9..a43233df460 100644
--- a/targets/TARGET_STM/TARGET_STM32L4/serial_device.c
+++ b/targets/TARGET_STM/TARGET_STM32L4/serial_device.c
@@ -241,8 +241,9 @@ void serial_clear(serial_t *obj)
     struct serial_s *obj_s = SERIAL_S(obj);
     UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
 
-    huart->TxXferCount = 0;
-    huart->RxXferCount = 0;
+    /* Clear RXNE and error flags */
+    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->RDR;
+    HAL_UART_ErrorCallback(huart);
 }
 
 void serial_break_set(serial_t *obj)
diff --git a/targets/TARGET_STM/TARGET_STM32WB/serial_device.c b/targets/TARGET_STM/TARGET_STM32WB/serial_device.c
index 3891a6c2f5d..7128c8e9f81 100644
--- a/targets/TARGET_STM/TARGET_STM32WB/serial_device.c
+++ b/targets/TARGET_STM/TARGET_STM32WB/serial_device.c
@@ -186,8 +186,9 @@ void serial_clear(serial_t *obj)
     struct serial_s *obj_s = SERIAL_S(obj);
     UART_HandleTypeDef *huart = &uart_handlers[obj_s->index];
 
-    huart->TxXferCount = 0;
-    huart->RxXferCount = 0;
+    /* Clear RXNE and error flags */
+    volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->RDR;
+    HAL_UART_ErrorCallback(huart);
 }
 
 void serial_break_set(serial_t *obj)