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   REPLYADDR jjlarkin@highlandtechnology.com   
   REPLYTO 3:770/3.0 UUCP   
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   PID: SoupGate-Win32 v1.05   
   XPost: sci.electronics.design   
      
   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-Kab   
   l/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-E   
   pansion/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. It seems like the pins are renamed on the   
   Pi 400, where pin 3 is GPIO8. Why would they do that?   
      
   --- SoupGate-Win32 v1.05   
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