I2C/IIC working on RPI4 8GB?

[Klaus Küchemann]

> On 29 Apr 2021, at 19:17, Mark Millard <marklmi at yahoo.com> wrote:
>> …..Looking around, I see:
> 
> https://github.com/raspberrypi/hats/blob/master/designguide.md
> 
...
> Am 30.04.2021 um 09:55 schrieb Mark Murray <markm at FreeBSD.org>:
> That's a useful document, thanks, but I'm not yet making much progress.……

…..

> . The pins 2/3 need to be configured to be BCM2835_FSEL_ALT0 (FSEL[2-3]=4), and pinctrl-0 is 0x17, but that doesn’t seem to help register GPFSEL0 fields FSEL3(11:9) and FSEL(8:6).
> 
> 
> Mark R V Murray


yet another useful document(at least that's what I hope to fix your usecase) :

https://www.raspberrypi.org/documentation/configuration/config-txt/gpio.md


K.