Problems handling framing errors and SCI

barbercolman — Thu, 29 Oct 2020 09:27:40 GMT

I am using MQX 3.7 and CW10.1 on a MCF51JM. I have a serial communications handler that works for hours until the receiver gets hit with noise. When the receiver get a framing error the transmitter can not be enabled. I am not sure what is happening. My receive code

while ( fstatus(rs485_dev) ==TRUE ) {read(rs485_dev, &data, 1);

checks status and so does my tx code.

io=_io_ioctl( rs485_dev,IO_IOCTL_SERIAL_CAN_TRANSMIT, &io);
if io == MQX_OK){
fwrite(&data, 1, 1, rs485_dev);
}

I am not sure what to do next. Any suggestions?

Re: Problems handling framing errors and SCI

Tgomes — Fri, 25 Nov 2011 23:34:56 GMT

Hi,

I'm not sure, but I think you're testing the return of "IO_IOCTL_SERIAL_CAN_TRANSMIT" incorrectly. If the serial is busy, "io_ioctl" also will return MQX_OK. Instead of assigning a return to "io", try the following:

_io_ioctl (rs485_dev, IO_IOCTL_SERIAL_CAN_TRANSMIT, & io);

if (io) {
fwrite (& data, 1, 1, rs485_dev);
}

Regards,
Tgomes

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Problems handling framing errors and SCI

Re: Problems handling framing errors and SCI