Re: i2c-slave-testunit over i2c-gpio bus

Matwey V. Kornilov
2025-02-18T10:21:52Z

вт, 18 февр. 2025 г. в 13:02, Wolfram Sang <wsa@sang-engineering.com>:

>
>
> > Thanks. But isn't it possible to attach an interrupt handler to SCL
> > GPIO? Or do you mean that the latency for IRQ handling is too high?
>
> Way too high for most systems. I made the in-kernel sloppy GPIO logic
> analyzer. From that experience, even with constant polling using an
> isolated CPU core, you would need at least a dedicatded 300MHz core to
> monitor 100kHz. With interrupts, it will probably be a magnitutde more.
> I scrapped that idea for the above analyzer, too slow.
>

Thanks for sharing this. Initially, I didn't realize this.