Raspberry Pi 5 -> GPIO Package Can it Support as of Today ????

[jldigi40]

I have been playing with the current latest 3.10 GPIO Nuget Package and worked on Rasperry Pi 4.

When use on Pi 5 get exception error ...

1/5/2024 4:49:05 PM :  Cannot open-create Input Device ?....System.IO.IOException: Error while requesting event listener for pin 17, error code: 16
   at System.Device.Gpio.Drivers.LibGpiodDriverEventHandler.SubscribeForEvent(SafeLineHandle pinHandle)

I get same error if change pinnaming or any pin mode setting.

Onlu Open and Close Pin causes no exception

I believe Pi4 and 5 the registers on board a different to drive the 40 pin I/O pins ?

Can I get confirmation Pi5 is not supported as of today using this GPIO ?

Funny think I2C drivers for PI 4 work on PI 5 as use this also, but GPIO is failing.

[pgrawehr]

Which driver are you using? We did have confirmation that Libgpiod should work on the Raspberry Pi 5. It is expected that the RaspberryPi3Driver is not working, as that uses an interface that is not available on the Pi5.

Please show a simple example that causes the above error.

[krwq]

The error message suggests that comes from Libgpiod. @jldigi40 I'm not sure the events are supported on Pi 5, I'd start with regular Read/Write before trying that. Also you might want to try to pass different gpio chip, I recall the chip might be 1 on RPi5 rather than default 0 (but I might misremember). Here's how you do that: new GpioController(PinNumberingScheme.Logical, new LibGpiodDriver(gpioChip: 1))

We should add proper support sometime in the near future so that gets picked up automatically

[jldigi40]

Hello ALL,

Thanks, quick response, I had a play with recommended using LibGpiodDriver as recommended and if use LibGpiodDriver(gpioChip: 1) I get exception to creating a GpioController Object. If run LibGpiodDriver(gpioChip: 0), get no exception

var controller = new GpioController(PinNumberingScheme.Logical, new LibGpiodDriver(gpioChip: 0));
// new LibGpiodDriver(gpioChip: 0) work Pi5

//// DIO6

controller.OpenPin(24, PinMode.InputPullUp);

controller.OpenPin(24).ValueChanged += pin24Change;

Also the event handling like attach handler to 'ValueChanged' works all ok so far

I need to run some real world test simulate inputs and see if reacts correctly..... cross fingers

Just some background,

I have a PI and an Industrial IO Carrier from 'UniPi' - Product is UniPi 1.1 Lite - https://www.unipi.technology/unipi-1-1-lite-p83

It has 6 optically isolated inputs (0-24V) and 6 relays - controlled from I2C MCP 23008 chip , this I have working - ie output control ( pi3-4 and now pi 5) End project is a product dev R&D-POC for a Industrial Edge Device Handler.

I need IO to monitor machine inputs the unit will be attached too - ie legacy machinery so need to control some outputs also as well as three separate industry protocols (TCP-IP) based. Basing solution on Blazor for a Web Interface and C# backend for protocol and application Edge IO control.

[huesla]

For Pi5 you have to use GPIO chip 4 instead of 0, as compared to Pi4. This is because Pi5 has a slightly different GPIO line schema. Use the gpioinfo command for more information, it comes with the libgpiod package.

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