For a school assignment, i have to write a program that uses a nullmodem to let 2 computers communicate with each other by exchanging some data and doing some simple calculations with the data they exchange. We can choose which programming language we use... i thought C would be the best choice considering the following: We are not allowed to do it 'the POSIX way'... that means, just opening a file descriptor to /dev/ttySX and writing and reading from that file descriptor isn't the way we should do it... we really have to set and change bits from the UART (16550 or 16450 that is i guess...) Now my question is: what would be the best 'tactic' to do this? Can this be done completely in userland or do i have to write a kernel module for that (I have the Linux device driver book here, so i think i could manage writing a simple module...) I've been looking on the Internet for information on how to do this, but the best things i can come up with are pages illustrating how it is done 'the POSIX' way and pages which present me DOS-code... some examples of such DOS code are: http://www.beyondlogic.org/serial/buff1024.c http://www-personal.engin.umich.edu/~hphe/lab/rs232.html I'm looking for how to do this kind of stuff 'the linux way'... where should i start, what would be the 'nicest' way of programming this and where can i find more info or examples? Thanks, Bart PS: the full assignment (only in Dutch... sorry) is at http://mc303.ulyssis.org/downloads/Opgave2.jpg -- Ing. Bart Vandewoestyne Bart.Vandewoestyne@pandora.be Hugo Verrieststraat 48 GSM: +32 (0)478 397 697 B-8550 Zwevegem http://users.pandora.be/vandewoestyne ---------------------------------------------------------------------- "Any fool can know, the point is to understand." - Albert Einstein -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
