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   REPLYADDR jjlarkin@highlandtechnology.com   
   REPLYTO 3:770/3.0 UUCP   
   MSGID:  1baf4b77   
   PID: SoupGate-Win32 v1.05   
   XPost: sci.electronics.design   
      
   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   
   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-Expa   
   sion/dp/B08RZCR7S8   
      
   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!   
      
   --- SoupGate-Win32 v1.05   
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