On Mon, May 06, 2002 at 08:29:18PM +0200, Bart Vandewoestyne wrote: > Greg KH wrote: > > > > You do not need to write any kernel module, this can all be done from > > userspace. Please see one of the many Linux Serial Programming HOWTOs > > that are available. > > I've beel looking in this HOWTO (not *that* thoroughly, just took a > quick look and watched the programming examples) and as far as I can > see, all these examples *do* use a _file descriptor_ and 'interact' > with the serial port by sending and writing data to that _file > descriptor_... and that's *not* what I have to do: i have to program > the UART directly, that is 'set individual bits on the UART' up until > i manage to send something out and receive something... Um, that's the only way to talk to a serial port from Linux (open(), read(), and write() on the /dev node, and then use tcgetattr() and friends to set and get line settings.) > I guess I will be needing the inb, outb or ioctl system calls, right? If you have to talk directly to the serial port hardware, then you will have to write a kernel driver. But since there already is a kernel driver written for the serial port, I would suggest looking at how it works. And I would also not suggest asking world-wide mailing lists for help with homework :) Good luck, greg k-h -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
