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List:       freebsd-arm
Subject:    Re: I2C/IIC working on RPI4 8GB?
From:       Klaus_Küchemann_via_freebsd-arm <freebsd-arm () freebsd ! org>
Date:       2021-04-30 14:22:29
Message-ID: F38325DB-DC0E-44F8-A256-A5D6A23925D0 () googlemail ! com
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> On 29 Apr 2021, at 19:17, Mark Millard <marklmi@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@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.
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