Re: [Xenomai-help] RTDM & serial port

[Hannes Mayer <h.mayer@domain.hid>]

Hannes Mayer wrote:
[...]
> Just one further thing:
> I've modified rt_serial_uprog.c and I just open rtser0 for reading and 
> writing.
> That works, I can write to it and read data back from it, but:
> 
> In read_task_proc:
>     ret = rt_dev_ioctl(my_fd, RTSER_RTIOC_WAIT_EVENT, &rx_event );
> rt_dev_ioctl always returns -1 - it doesn't block.
[...]
> How can I get rt_dev_ioctl to block ?

AHA! Found it! :-)

There is
             if (!rtdm_in_rt_context())
                 return -EPERM;
in rt_16550_ioctl(...)

Silly me put a printf into it:
	ret = rt_task_set_mode(0, T_PRIMARY, NULL);
	[...]
	printf(RTASK_PREFIX "waiting for event\n");
	ret = rt_dev_ioctl(write_fd, RTSER_RTIOC_WAIT_EVENT, &rx_event );
so the whole thing was not in RT anymore.

Thanks again and best regards,
Hannes.