Subj : Re: RP400 40-pin connector To : jjlarkin@highlandtechnology.com From : Jan Panteltje Date : Mon Aug 12 2024 00:03:52 XPost: sci.electronics.design On a sunny day (Sun, 11 Aug 2024 13:59:36 -0700) it happened John Larkin wrote in : >On Sun, 11 Aug 2024 16:22:04 -0400, "Edward Rawde" > wrote: > >>"John Larkin" 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 > >Yes. > >> >>> 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. > >The real question is whether pin 3 is GPIO8 or GPIO2, and which two >pins are the SW debug. > >On the Pi4, pin 3 is GPIO2. GPIO2 and I2C1 sda >It seems like the pins are renamed on the >Pi 400, where pin 3 is GPIO8. Why would they do that? Yes, https://www.pi4j.com/1.4/pins/rpi-400.html But see the warning, also about reconfiguring the serial port for hardware Have not tried it, no 400 here. There were also changes between Pi1 and Pi2 IIRC: https://panteltje.nl/panteltje/newsflex/download.html#freq_pi encountered that... Why? The world is changing... --- SoupGate-Win32 v1.05 * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3) .