Seatalk input, MacArthur HAT and rpi5. Options?

[gpatsiaouras]

There are no hardware limitations on Raspberry 5, even Raspberry 3 can bit banging any GPIO at 4800 baud. The current limitation of the Raspberry 5 is the software. The hardware architecture changed a lot on Raspberry 5 and the pigpio library no longer works on it. This library was the only one capable of bit banging 4800 baud 9bit and there are no plans to update it.

I have been doing some testing with current and active libraries, but none are ready for this. I want to do one last test before throwing in the towel.  I am pretty sure this will work, but we may need help here.

I want to try libgpiod - gpiomon. It has nanosecond granularity and allows for biases, edges, and even buffering, so I think it can work. Any help is welcome.

Hi Sailloog,

That's good to hear (that it's not a hardware issue) because I'd really like to use the HAT instead of an external solution.
I can definitely offer help, I am a software engineer myself as my day job, eEspecially if it's python/javascript. Hardware I do as a hobby. If you can give me some pointers or specific things I can do to help you, maybe some links to docs/github repo, I can get to it.

Thanks!

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I'm pretty happy with my SeaTalk->NMEA converter.from YakBitz.  They have a wired and a USB version. Both are $69(aus) delivered. https://www.yakbitz.com/Default.aspx

That is a good alternative yeah, if all shit hits the fan with the rpi5 and gpios. 69$ for shipping to europe is quite good. Thanks I'll keep it in mind

There are a few options discussed in this thread.

Seems like gpiozero is the "recommended" way forward, and the documentation seems to imply it can do bit banging.
https://gpiozero.readthedocs.io/en/stable/api_pins.html

I'm not an expert, but hopefully this helps?

Yes appending to what sailoog mentioned since the GPIOs software is the culprit it makes a lot of sense to work towards a rpi5 specific solution. That's a good starting point thanks.