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   XPost: sci.electronics.design   
      
   On a sunny day (Sun, 11 Aug 2024 11:53:20 -0700) it happened John Larkin   
    wrote in   
   :   
      
   >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-Exp   
   nsion/dp/B08RZCR7S8   
      
   Expensive   
   Just some ideas... things I used with normals Pis :-)   
   https://www.panteltje.com/pub/rtl_sdr_dump1090_via_FDS132_matrix   
   display_Raspberry_Pi_driver_IMG_4149.JPG   
   https://www.panteltje.nl/pub/FDS132_matrix_display_Raspberry_Pi_   
   nterface_board_IMG_4129.JPG   
   https://panteltje.nl/pub/raspberry_pi_interface_to_pic_programme   
   _IXIMG_1345.JPG   
      
      
   >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 dunno, have no 400 here.   
      
      
   >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?   
      
   Debugging via RS232 is a good thing.   
      
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