Path: ...!news-out.netnews.com!s1-1.netnews.com!feeder.usenetexpress.com!tr2.iad1.usenetexpress.com!usenet.blueworldhosting.com!diablo1.usenet.blueworldhosting.com!nnrp.usenet.blueworldhosting.com!.POSTED!not-for-mail
From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design,comp.sys.raspberry-pi
Subject: Re: RP400 40-pin connector
Date: Sun, 11 Aug 2024 16:22:04 -0400
Organization: BWH Usenet Archive (https://usenet.blueworldhosting.com)
Lines: 36
Message-ID: <v9b6he$a3u$1@nnrp.usenet.blueworldhosting.com>
References: <d21ibjdvt6odqium3ado62ob1e7sa6n9hc@4ax.com>
Injection-Date: Sun, 11 Aug 2024 20:22:06 -0000 (UTC)
Injection-Info: nnrp.usenet.blueworldhosting.com; logging-data="10366"; mail-complaints-to="usenet@blueworldhosting.com"
Cancel-Lock: sha1:Oh7JRMqKD06tdlXB6FnrK5pzL10= sha256:30yj//2K+4xJIeqzdCV2092GLSSMgrjddWByRoPrQbM= sha1:azJi89DFfw3g5u2B7X+vgo9cJos= sha256:QlkjsqYE99AnHj/G6xMecYavkZUpQt4ESP7+9V6ui38=
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157
X-Priority: 3
X-RFC2646: Format=Flowed; Original
X-Newsreader: Microsoft Outlook Express 6.00.2900.5931
X-MSMail-Priority: Normal
Bytes: 2503

"John Larkin" <jjlarkin@highlandtechnology.com> wrote in message news:d21ibjdvt6odqium3ado62ob1e7sa6n9hc@4ax.com...
>I want to use an Raspberry Pi 400 (the keyboard thing) as the
> dev/debug system for an RP2040 based product.
>
> https://www.amazon.com/Raspberry-Computer-Keyboard-Layout-Kabel/dp/B08QCQVWH2
>
> It has a 40-pin connector on the back. Various sources say that pins 1

This connector?
https://www.pi4j.com/1.3/images/pi4j-rpi-400-pinout.png

> 3 and 5 are either GPIO ports 8 9 and 7 or maybe 2 3 and 4.
>
> Sometimes the pins are labeled WPI and BCM. Wot's that?
>
> https://www.amazon.com/Coolwell-Waveshare-Raspberry-Adapter-Expansion/dp/B08RZCR7S8

If that's just a connector then continuity check it to the above drawing of the connector on the Pi.

>
> I can fix most mistakes there in software, just by reassigning port
> names. But two pins are critical, the SWDIO and SWCLK debug lines out
> to a Pi Pico or to the 2040 chip.
>
> I suspect that on the Pi 400 pin 18 is GPIO5 = SWDIO and pin 22 is
> GPIO6 = SWCLK.
>
> Is that right? Does that actually work?
>
> I also note that some people also connect the UART tx/rx between the
> Pi400 and a Pico for debugging. Should I do that too? Does it help
> software development?
>
> Thanks!