Re: [Xenomai-help] adding PCI support to 16550A.c

[Jan Kiszka <jan.kiszka@domain.hid>]

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Bachman Kharazmi wrote:
>> You can copy this code almost unmodified into an application and compile
>> it against the Xenomai POSIX skin. The serial port configuration apart
>> (same under Linux, though), it will open "rtser<whatever>", even if
>> given like "/dev/rtser...", and work on that port as if it where a Linux
>> one. Life can be simple, sometimes.
> 
> Simple? ;)
> I've tried to write a c-program which basiclly should open the device
> rtser0 and write 100x to it and then close.
> 
> The simple program can be found here: http://pastebin.ca/693873
> 
> I've connected the serial cable to a reading terminal, but there's no
> data at all, when I run the binary. :/
> 

[Untested late-night hack after some Maß of beer - please excuse
potential nonsense.]

POSIX skin
----------
(use xeno-config --posix-cflags --posix-ldflags as compiler args)

#include bla bla bla

static const struct rtser_config write_config = {
        .config_mask       = RTSER_SET_BAUD,
        .baud_rate         = 115200,
};

int main(int argc, char *argv[])
{
	int fd;

	fd = open("/dev/rtser0", O_RDWR);
	ioctl(fd, RTSER_RTIOC_SET_CONFIG, &write_config);
	write(fd, argv[1], strlen(argv[1]));
	close(fd);

	return 0;
}


Native skin
-----------

...
int main(int argc, char *argv[])
{
	int fd;
	RT_TASK task;

	fd = rt_dev_open("/dev/rtser0", O_RDWR);
	rt_dev_ioctl(fd, RTSER_RTIOC_SET_CONFIG, &write_config);

	rt_task_shadow(&task, NULL, 0, 0); /* may be done earlier,
                                              but not later */

	rt_dev_write(fd, argv[1], strlen(argv[1]));
	rt_dev_close(fd);

	return 0;
}


Similar is imaginable for reading from the serial port.

Completed and tested versions, maybe also taking the baudrate as
argument, will be happily accepted to the examples or tools repos.

Jan


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