diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_usart.c b/bsp/stm32/libraries/HAL_Drivers/drv_usart.c
index 6eb6fafdb93da56dcccf556b4acf4bd12ffa5cdc..fa404b2163629e8fd59394a1bce295ae3a4778a4 100644
--- a/bsp/stm32/libraries/HAL_Drivers/drv_usart.c
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_usart.c
@@ -251,6 +251,53 @@ static rt_err_t stm32_control(struct rt_serial_device *serial, int cmd, void *ar
     return RT_EOK;
 }
 
+rt_uint32_t stm32_uart_get_mask(rt_uint32_t word_length, rt_uint32_t parity)
+{
+    rt_uint32_t mask;
+    if (word_length == UART_WORDLENGTH_8B)
+    {
+        if (parity == UART_PARITY_NONE)
+        {
+            mask = 0x00FFU ;
+        }
+        else
+        {
+            mask = 0x007FU ;
+        }
+    }
+#ifdef UART_WORDLENGTH_9B
+    else if (word_length == UART_WORDLENGTH_9B)
+    {
+        if (parity == UART_PARITY_NONE)
+        {
+            mask = 0x01FFU ;
+        }
+        else
+        {
+            mask = 0x00FFU ;
+        }
+    }
+#endif
+#ifdef UART_WORDLENGTH_7B
+    else if (word_length == UART_WORDLENGTH_7B)
+    {
+        if (parity == UART_PARITY_NONE)
+        {
+            mask = 0x007FU ;
+        }
+        else
+        {
+            mask = 0x003FU ;
+        }
+    }
+    else
+    {
+        mask = 0x0000U;
+    }
+#endif
+    return mask;
+}
+
 static int stm32_putc(struct rt_serial_device *serial, char c)
 {
     struct stm32_uart *uart;
@@ -282,9 +329,9 @@ static int stm32_getc(struct rt_serial_device *serial)
 #if defined(SOC_SERIES_STM32L4) || defined(SOC_SERIES_STM32WL) || defined(SOC_SERIES_STM32F7) || defined(SOC_SERIES_STM32F0) \
     || defined(SOC_SERIES_STM32L0) || defined(SOC_SERIES_STM32G0) || defined(SOC_SERIES_STM32H7) \
     || defined(SOC_SERIES_STM32G4) || defined(SOC_SERIES_STM32MP1) || defined(SOC_SERIES_STM32WB)|| defined(SOC_SERIES_STM32F3)
-        ch = uart->handle.Instance->RDR & 0xff;
+        ch = uart->handle.Instance->RDR & stm32_uart_get_mask(uart->handle.Init.WordLength, uart->handle.Init.Parity);
 #else
-        ch = uart->handle.Instance->DR & 0xff;
+        ch = uart->handle.Instance->DR & stm32_uart_get_mask(uart->handle.Init.WordLength, uart->handle.Init.Parity);
 #endif
     }
     return ch;
diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_usart_v2.c b/bsp/stm32/libraries/HAL_Drivers/drv_usart_v2.c
index a2b6dc31bda110ea993198fb1b3e1d7e49bc81dc..038129beef7af2cbef1a526adf3e6cd938d73865 100644
--- a/bsp/stm32/libraries/HAL_Drivers/drv_usart_v2.c
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_usart_v2.c
@@ -302,6 +302,53 @@ static int stm32_putc(struct rt_serial_device *serial, char c)
     return 1;
 }
 
+rt_uint32_t stm32_uart_get_mask(rt_uint32_t word_length, rt_uint32_t parity)
+{
+    rt_uint32_t mask;
+    if (word_length == UART_WORDLENGTH_8B)
+    {
+        if (parity == UART_PARITY_NONE)
+        {
+            mask = 0x00FFU ;
+        }
+        else
+        {
+            mask = 0x007FU ;
+        }
+    }
+#ifdef UART_WORDLENGTH_9B
+    else if (word_length == UART_WORDLENGTH_9B)
+    {
+        if (parity == UART_PARITY_NONE)
+        {
+            mask = 0x01FFU ;
+        }
+        else
+        {
+            mask = 0x00FFU ;
+        }
+    }
+#endif
+#ifdef UART_WORDLENGTH_7B
+    else if (word_length == UART_WORDLENGTH_7B)
+    {
+        if (parity == UART_PARITY_NONE)
+        {
+            mask = 0x007FU ;
+        }
+        else
+        {
+            mask = 0x003FU ;
+        }
+    }
+    else
+    {
+        mask = 0x0000U;
+    }
+#endif
+    return mask;
+}
+
 static int stm32_getc(struct rt_serial_device *serial)
 {
     int ch;
@@ -311,7 +358,7 @@ static int stm32_getc(struct rt_serial_device *serial)
 
     ch = -1;
     if (__HAL_UART_GET_FLAG(&(uart->handle), UART_FLAG_RXNE) != RESET)
-        ch = UART_GET_RDR(&uart->handle);
+        ch = UART_GET_RDR(&uart->handle, stm32_uart_get_mask(uart->handle.Init.WordLength, uart->handle.Init.Parity));
     return ch;
 }
 
@@ -403,7 +450,7 @@ static void uart_isr(struct rt_serial_device *serial)
         rx_fifo = (struct rt_serial_rx_fifo *) serial->serial_rx;
         RT_ASSERT(rx_fifo != RT_NULL);
 
-        rt_ringbuffer_putchar(&(rx_fifo->rb), UART_GET_RDR(&uart->handle));
+        rt_ringbuffer_putchar(&(rx_fifo->rb), UART_GET_RDR(&uart->handle, stm32_uart_get_mask(uart->handle.Init.WordLength, uart->handle.Init.Parity)));
 
         rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
     }
diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_usart_v2.h b/bsp/stm32/libraries/HAL_Drivers/drv_usart_v2.h
index 4b2091b446e91df433c9f6f825da0b34199a3f74..defa740c534f308d6b7f8b1b8a1b8191728a4678 100644
--- a/bsp/stm32/libraries/HAL_Drivers/drv_usart_v2.h
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_usart_v2.h
@@ -24,11 +24,11 @@ int rt_hw_usart_init(void);
     || defined(SOC_SERIES_STM32L0) || defined(SOC_SERIES_STM32G0) || defined(SOC_SERIES_STM32H7) \
     || defined(SOC_SERIES_STM32G4)
 #define UART_SET_TDR(__HANDLE__, __DATA__)  ((__HANDLE__)->Instance->TDR = (__DATA__))
-#define UART_GET_RDR(__HANDLE__)            ((__HANDLE__)->Instance->RDR & 0xFF)
+#define UART_GET_RDR(__HANDLE__, MASK)            ((__HANDLE__)->Instance->RDR & MASK)
 
 #else
 #define UART_SET_TDR(__HANDLE__, __DATA__)  ((__HANDLE__)->Instance->DR = (__DATA__))
-#define UART_GET_RDR(__HANDLE__)            ((__HANDLE__)->Instance->DR & 0xFF)
+#define UART_GET_RDR(__HANDLE__, MASK)            ((__HANDLE__)->Instance->DR & MASK)
 #endif