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Subject: Re: DS1307 on rpi4B
From: Daniel O'Connor <darius@dons.net.au>
In-Reply-To: <CAJzLSnw5uuVhc9=HC5sCRv0nBzPXfbq_WVfYrmMg-h99hyRO-A@mail.gmail.com>
Date: Sun, 8 Dec 2024 14:10:54 +1030
Cc: FreeBSD ARM List <freebsd-arm@freebsd.org>
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Hi,

> On 8 Dec 2024, at 12:35, =E9=A2=A8=E4=BE=86=E6=95=A3=E4=BA=BA =
<furaisanjin@gmail.com> wrote:
> I modified config.txt to load this dtbo and add one more line to set =
GPIO pins in [pi4]
>=20
> gpio=3D12,13=3Da5,pu
>=20
> This works fine and RTC starts working. One strange thing is that =
"gpioctl -l -v" doesn't show correct pin setting somehow. I assumed =
there should be PU on pin 12 and 13.
>=20
> pin 12: 1       pin 12<>, =
caps:<IN,OUT,PU,PD,INTRLL,INTRLH,INTRER,INTREF,INTREB>
> pin 13: 1       pin 13<>, =
caps:<IN,OUT,PU,PD,INTRLL,INTRLH,INTRER,INTREF,INTREB>

Strange - I don't know if the pull ups on the SoC are suitable for I2C. =
The modules I have used have pull ups as real resistors - in internal =
pull-ups on SoCs tend to have a pretty broad range due to the way they =
are fabricated.

--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum