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[DeviceDriver] stm32: Remove explicity clear of RXNE flag

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According to STM32 Manual, the USART RXNE flag will be clear automatically after
read to the USART_DR register[1], so the call to USART_ClearITPendingBit is
unnecessary.

[1]: See RM0090 Reference Manual p.992, Bit 5
This commit is contained in:
ItsEddy
2015-04-07 20:37:59 +08:00
parent a3919b90fe
commit ced7d5a34f
2 changed files with 0 additions and 10 deletions
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4
bsp/stm32f0x/drivers/usart.c
View File

@@ -152,8 +152,6 @@ void USART1_IRQHandler(void)
if(USART_GetITStatus(uart->uart_device, USART_IT_RXNE) != RESET)
{
rt_hw_serial_isr(&serial1, RT_SERIAL_EVENT_RX_IND);
/* clear interrupt */
USART_ClearITPendingBit(uart->uart_device, USART_IT_RXNE);
}
if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
{
@@ -186,8 +184,6 @@ void USART2_IRQHandler(void)
if(USART_GetITStatus(uart->uart_device, USART_IT_RXNE) != RESET)
{
rt_hw_serial_isr(&serial2, RT_SERIAL_EVENT_RX_IND);
/* clear interrupt */
USART_ClearITPendingBit(uart->uart_device, USART_IT_RXNE);
}
if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
{

6
bsp/stm32f40x/drivers/usart.c
View File

@@ -177,8 +177,6 @@ void USART1_IRQHandler(void)
if (USART_GetITStatus(uart->uart_device, USART_IT_RXNE) != RESET)
{
rt_hw_serial_isr(&serial1, RT_SERIAL_EVENT_RX_IND);
/* clear interrupt */
USART_ClearITPendingBit(uart->uart_device, USART_IT_RXNE);
}
if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
{
@@ -211,8 +209,6 @@ void USART2_IRQHandler(void)
if (USART_GetITStatus(uart->uart_device, USART_IT_RXNE) != RESET)
{
rt_hw_serial_isr(&serial2, RT_SERIAL_EVENT_RX_IND);
/* clear interrupt */
USART_ClearITPendingBit(uart->uart_device, USART_IT_RXNE);
}
if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
{
@@ -245,8 +241,6 @@ void USART3_IRQHandler(void)
if (USART_GetITStatus(uart->uart_device, USART_IT_RXNE) != RESET)
{
rt_hw_serial_isr(&serial3, RT_SERIAL_EVENT_RX_IND);
/* clear interrupt */
USART_ClearITPendingBit(uart->uart_device, USART_IT_RXNE);
}
if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
{