Raspberry PI GPIO Example

[Eugene_Dakin]

Hello Sass,

Here are answers to some of your questions:

Program Raspberry Pi 4B Electronics with Xojo – pigpiod Library – mix of Xojo API1 and API2
Program Raspberry Pi 2B and 3B Electronics with Xojo – WiringPi – Xojo API 1

WiringPi is deprecated, which means that the library is not being updated. I do not know when the library would stop working.

@SASS_S

Does it mean both pigpio and wiring pi are maintained in the OS ?

Yes, both libraries are installed in the Raspberry Pi OS, and only pigpio is being updated.

@SASS_S

Is there any possibility of using the interrupts in Xojo itself instead of the IPCSocket

Here is the link where it is mentioned that the WiringPiISR is not safe with Xojo (contribution with @MarkusR ): gpio event at level change - #2 by Eugene_Dakin

@Julia_Truchsess

If you don’t want to get into interrupts, callbacks, IPC, Python and so forth, you can also just check the state of your inputs at intervals using a timer, depending on what amount of latency you can tolerate. Checking at say 100ms intervals should leave plenty of time for the processor to handle other tasks like the UI. Not sure how short the polling interval can be made before things get bogged down.

@Julia_Truchsess is a professional and this is likely your best option, if you are to use Xojo with the Raspberry Pi.