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

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

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Jan Kiszka wrote:
> 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);

The first error, copy&paste: This must be just "rtser0".

> 	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.

BTW, a generic serial dump tool should, of course, also take the port
number as parameter.

Jan


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