Hello,
The UART contains many status flags that can be cleared by different way. See a reference manual - UART device.
For example RDRF flag is cleare by the following way:
Receive Data Register Full Flag
RDRF is set when the number of datawords in the receive buffer is equal to or more than the number
indicated by RWFIFO[RXWATER]. A dataword that is in the process of being received is not included in
the count. To clear RDRF, read S1 when RDRF is set and then read D. ...
The KSDK 1.2.0 contains the following function for clearing flags (see the file KSDK_1.2.0\platform\hal\src\uart\fsl_uart_hal.c) but the function can clear several flags only (other flags are cleared by different ways):
/*FUNCTION**********************************************************************
*
* Function Name : UART_HAL_ClearStatusFlag
* Description : Clear an individual and specific UART status flag.
* This function allows the user to clear an individual and specific UART
* status flag. Refer to structure definition uart_status_flag_t for list of
* status bits.
*
*END**************************************************************************/
uart_status_t UART_HAL_ClearStatusFlag(UART_Type * base, uart_status_flag_t statusFlag)
Best Regards,
Marek Neuzil
