请教一个28335SCI接收错误状态问题

根据RXERROR寄存器的定义，这个寄存器跟是否使用RXFIFO应该没什么关系
SCI receiver error flag.
The RX ERROR flag indicates that one of the error flags in the
receiver status register is set. RX ERROR is a logical OR of the
break detect, framing error, overrun, and parity error enable flags
(bits 5-2: BRKDT, FE, OE, and PE).
A 1 on this bit will cause an interrupt if the RX ERR INT ENA bit
(SCICTL1.6) is set. This bit can be used for fast error-condition
checking during the interrupt service routine. This error flag cannot
be cleared directly
it is cleared by an active SW RESET or by a system reset.
Reset type: SYSRSn
0h (R/W) = No error flags set
1h (R/W) = Error flag(s) set

后面两个问题我找其他负责SCI的工程师确认一下之后再回复你

以下是美国工程师的回复：
First thing to debug the issue would be to resolve the cause of RXERROR. This bit is set when any of the bits 5-2 of SCIRXST (receive status) register are set. So when the RXERROR bit is being set which of these bits (BRKDT, FE, OE, PE) are being set?

The only way to reset the RXERROR bit is using SCI software reset.

SciaRegs.SCICTL1.all =0x0003;

SciaRegs.SCICTL1.all =0x0023;

To trigger the receive interrupt because of RXERROR it is necessary to turn on the receive interrupt error enable (RXERRINTENA).

个人理解：接收状态下，SCIRXST的5-2位被置1之后RXERROR位就会被置1。所以，RXERROR被置1的时候BRKDT, FE, OE, PE其中应该有被置1的。复位RXERROR位的唯一方法是SCI软件复位。