Sir,
I've posted this question on a newsgroup, but got no response. Is there a cuaa-guru out there ? :-)
Sorry, but I cannot answer your questions, since I am stuck in a much earlier stage of serial programming in FreeBSD/Unix.
I'm in a Windows-environment only. A Windowns machine can communicate via the serial port with one of our data acquisition equipement (it's a chemistry lab here). The serial data exchange is well documented in the equipement manuals; e.g. 9600 baud, 8 bits, no stop bit etc. in duplex mode receiving and sending data/commands. The Windows C-program is directly manipulating the registers on the 16550A RS232 port, it's interrupt driven and works like a charm.
I want to this data acquisition using a FreeBSD OS. Strange enough, all documentation I can find is related to terminal or console serial setups. Is nobody using FreeBSD/Unix for data acquisition in research environment?
So where do I start? I'd thought a good starting point to learn how things work, would be at first implementing:
int main()
{
int fd = <????>;
struct termios t;
speed_t s1, s2;tcgetattr(fd, &t); s1 = cfgetispeed(&t); s2 = cfgetospeed(&t); }
But what is fd in this context of serial port communication?
----
And eh, is this actually the right way to go for data acquisition?
Thanks,
Rob Lahaye Seoul National University - Korea
Thanks ! Jean-Marc Francois Universit� de Li�ge
--------------- I got a strange problem.
I want to send a binary string to a small device I made via /dev/cuaa0.
The port settings should be 19200, 8N1 (no RTS/CTS, no XON/XOFF). Looks simple.
I've written a small program using the standard POSIX API : tcgetattr and the like.
When I launch my program, it doesn't work (well, it works with Linux but not with FreeBSD).
If I first launch minicom (and ask it to setup the serial port), let it in the
background and launch my program, it works.
The problem is that the dump of the 'stuct termios' my program is using with or without
minicom is the same, so that's not the problem (stty -f /dev/cuaa0 gives the same output
also).
I thought all the serial settings were in this structure; where am I wrong ?
Thank if you can help (if you can't, thanks for reading anyway :-) ), JM
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