Hi,

I am developing a free pascal software in Linux, which uses the parallel digital input/output card (with intel 8255) in an industrial PC. I was able to compile and run without problems with FP 2.0.4.

Now, that the oldlinux unit is removed in the latest FPC, I cannot compile the program any more.
The error messages are:
- identifier not found "fdOpen"
- identifier not found "fdWrite"
- identifier not found "fdRead"

I have tried replacing the oldlinux with other FP units including: SysUtils, Baseunix, Unix, UnixUtil, but it did not help.

Only adding the Unix-unit helped a bit, because then the following error messages disappeared (constants):
- Intentifier not found "OpenRdWr"
- Intentifier not found "OpenSync"

Could someone tell, what to do in order to compile the code with: fdOpen, fdWrite and fdRead in FP 2.2.X Or is there another solution to access the parallel IO-cards, may be there is a piece of software for this already ?

Regards
- Iisakki

Hi!

It seems you have a driver for this card and want to talk to the driver via a Linux device (in /dev/). My first thought was you wanted to access x86 IO ports (using IN and OUT instructions).

Simply use the online help to find the desired functions, e.g. http://community.freepascal.org:10000/docs-html/rtl/baseunix/fpopen This also lists the constants used for the access mode.

Bye
Hansi

You can use the ports unit. Read here:

http://wiki.lazarus.freepascal.org/Hardware_Access#Using_ioperm_to_access_ports_on_Linux

If you are using real files or named devices you could switch to using "sysutils". There you'll find "FileOpen", "FileREad" and so on. The modes are called "fmOpenRead", ...

Search through the rtl.pdf. I think these should be cross platform. For using "BaseUnix" the same doc has the names of the modes in the chapter fitting the unit name.

Thanks for the help, problem solved
- Iisakki