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);
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?