Posted on May 17, 2011 at 09:54UM0006 says on page 288 about Reg RSECR use 0x000F to clear error flags
But their code Function UART_ClearFlag() in file 91x_uart.c on line 426 uses UART_ClearFlag_Mask which is 0xAA
If I use DMA & UART1 can I still use DR or RSECR Registers to get old/stale Error Info?
* May need to check for Framing Errors
* See Reg UART1->DR
* Overrun Error is bit 11
* Break Error is bit 10
* Parity Error is bit 9
* Framing Error is bit 8
******************
* Warning: Looks like there are two (2) places to read these errors
* The received data character must first be read from the UART_DR register
* before reading the error status associated with that data character
* from the UART_RSECR register. However, the status information can also
* be obtained by reading the UART_DR register.
******************
* To Clear Error bits See Reg UART1->RSECR bits 3 - 0
* Overrun Error is bit 3 & Read clears it
* Break Error is bit 2 & Read clears it
* Parity Error is bit 1 & Read clears it
* Framing Error is bit 0 & Read clears it
/*******************************************************************************
* Function Name : UART_ClearFlag
* Description : Clears the UARTx’s flags(Frame, Parity, Break, Overrun error).
* Input : - UARTx: where x can be 0,1or 2 to select the UART peripheral.
* Output : None
* Return : None
*******************************************************************************/
void UART_ClearFlag(UART_TypeDef* UARTx)
{
/* Clear the flag */
UARTx->RSECR = UART_ClearFlag_Mask;
}
