Example;Lazarus and GPIO

[feverish]

Can anyone please point to the .PAS file(s) of a Lazarus project actually working on Raspi using the GPIO? I have read several posts about wiringpi and how it MUST be run under /root but while trying to learn Linux I'm almost ashamed to admit I just can't get my head around wrapper files which then point to getting something sometimes unspecified from elsewhere and where to put them. The particular problems I have is in 'Uses . . . ' and where to put the entry in the .PAS file(s) and any 'includes' and where they must reside, plus any 'IFDEFs'.

[DirkS]

I have read several posts about wiringpi and how it MUST be run under /root

That should be 'run as root', it has to do with permissions, not with location. You just run it with 'sudo' on the command line, e.g.:

Code: Select all

sudo myprogram

The archive with the Lazarus / FPC wrapper (which I assume you're using) also contains an example program (raspberry.lpr)

Gr.
Dirk.

[feverish]

Sounds wonderful! I'd love to see the sample programme, but in this context, what archive? How and where can I get it, please?

[feverish]

Please accept my apologies for not more closely specifying what it is I am looking for. Having left the world of terminal applications a long time ago, I omitted to say I needed an interface with the GPIO with a Lazarus gui application I have already written except for the GPIO bit.. I propose to use my Raspi to control and monitor the performance of a heater driven through a solid-state relay. The visual display of temperature and time, temperature alarm display and settings, log files and buttons to control heater ON/OFF, logfile views are catered for. This to some extent echos an earlier Arduino project I wrote and used, which is one reason I found wiringpi an attractive idea.

[DirkS]

It really does not make a difference whether you're using a GUI or a console application for GPIO programming.

What you're probably looking for is a library with visual elements for meters, buttons etc. This has nothing to do with GPIO programming.
I know there are some libraries available, but I cannot find any ATM. You'll have to search the web for that, unless somebody else has a suggestion.

Gr.
Dirk.

[feverish]

Thanks. I have already written the application, using Lazarus, except for the small GPIO bit, and will use the buttons etc provided by Lazarus. I think I may have stumbled upon a way to use wiringpi.c If I have, I'll upload details to the projects forum. Meantime, thanks to all who offered help.

[gordon@drogon.net]

Thanks. I have already written the application, using Lazarus, except for the small GPIO bit, and will use the buttons etc provided by Lazarus. I think I may have stumbled upon a way to use wiringpi.c If I have, I'll upload details to the projects forum. Meantime, thanks to all who offered help.

You can always write it in C to use wiringPi

Maybe counter productive if you want to use Pascal though!

There's always BASIC too (RTB has wiringPi support...)

It's well over 25 years since I last looked at Pascal though...

-Gordon

[DirkS]

Thanks. I have already written the application, using Lazarus, except for the small GPIO bit, and will use the buttons etc provided by Lazarus. I think I may have stumbled upon a way to use wiringpi.c If I have, I'll upload details to the projects forum. Meantime, thanks to all who offered help.

I thought you were actually using the FPC wrapper for wiringpc...

If not, you can find a link on the Laz / FPC forum: http://www.lazarus.freepascal.org/index ... 404.0.html (I think you have to be registered on the forum to get access to the files)

Gr.
Dirk.