MQX Software SolutionsのトピックRe: Serial ioctl functions

Serial ioctl functions

ARQuattr — Thu, 29 Oct 2020 09:10:48 GMT

I'm using MQX on a 52259 and I need to send a break sequence on a UART port.

This is what I'm doing:

FILE_PTR fh_ptr = NULL;   

fh_ptr = (pointer)fopen("ttyb:", (pointer) (IO_SERIAL_XON_XOFF));

ioctl(fh_ptr, IO_IOCTL_SERIAL_START_BREAK, NULL);
_time_delay(200);
ioctl(fh_ptr, IO_IOCTL_SERIAL_STOP_BREAK, NULL);

My understanding is that I should see the Tx line go low for 200ms after doing this. But I'm not sure I have the right commands, eg. I'm guess at the NULL argument. The only documentation I could find on this was the "MQX I/O Drivers User's Guide". I don't see a lot of detail in there on how to use the ioctl function, especially with these commands.

Is there some other documentation on the serial ioctl commands?

Thanks,

Angelo

Re: Serial ioctl functions

PetrM — Fri, 03 Dec 2010 22:54:37 GMT

Sorry, the serial driver documentation is simply not good.

Those two commands are not implemented yet.

PetrM

Re: Serial ioctl functions

ARQuattr — Mon, 10 Jan 2011 08:49:32 GMT

Thank you PetrM, it's good at least to get confirmation that I'm having the same issues as others.

For now, I'm doing this:

    MCF_UART1_UCR = MCF_UART_UCR_START_BREAK;
   _time_delay(200);
    MCF_UART1_UCR = MCF_UART_UCR_STOP_BREAK;