TLC549 A/D-Converter communication in C
 

Hi Folks!

At school we build a temperature gauger. The device is connected to the serial port and uses the TLC549 A/D-Converter. The board layout can be found at http://www.wvss-projekte.de/index.ph...ekte&prj=tmess sorry, it's only in german. Our teacher has made a program for that device, but it's only for windows (runs in wine, too) but I want to program a Linux native version.

My problem is, that I don't know, how to communicate with the TCL549 with the Linux (POSIX) functions. I found a kernel modul, but that's not running with the 2.6 Linux Kernel.

Another try was with the outb, inb and ioperm functions, which gave me a segmentation fault as root and no connection as normal user.

A second try was with the open and fnctl functions. But I don't know how to change the state on specific lines of the serial port.

I hope, that someone has a solution for that problem.

PS: It's the first time that I make a program on this low level (near the hardware).

You can use this example to get you started. For more examples, use Google.

Thank you for your answer. But in the meantime I already found some code examples and the program I wrote is nearly ready. If it's ready, I'll post the sources here. But it can take a few days, because I'm on a holliday trip ne for 1 week.

If you're interested in a library to communicate with the TLC548/549 family of A/D-converters, you can now visit http://sourceforge.net/projects/libtlc54x and get a copy of the library I build to get my device working.

If want to build the temperature gauge from http://www.wvss-projekte.de/index.ph...ekte&prj=tmess you can use the following tool and the library, to get the temperature data. http://www.dopehouse.dyndns.org/Software/T-Mess-Linux

The tool shows the temperature in celsius, but it's easy to show it as fahrenheit. You just need to convert celsius to fahrenheit.

°F=(°C*(9/5))+32