INTL 3:770/1 3:770/3   
   REPLYADDR jl@650pot.com   
   REPLYTO 3:770/3.0 UUCP   
   MSGID: <8sebqid12ml78k9t81h7hvc4cn8l46r5hi@4ax.com> 1f6b1901   
   REPLY: <6dd5a036-cf40-4d24-9147-a7e1b238aae1n@googlegroups.com> d072f07d   
   PID: SoupGate-Win32 v1.05   
   XPost: sci.electronics.design   
      
   On Mon, 15 Jan 2024 13:21:14 -0800 (PST), Lasse Langwadt Christensen   
    wrote:   
      
   >mandag den 15. januar 2024 kl. 22.05.18 UTC+1 skrev john larkin:   
   >> The Raspberry Pi pico has its 3-pin SWD debug port. I'd like to   
   >> connect it to the 40-pin header on the back of the Pi400, to use the   
   >> 400 as the dev/debug platform for some RP2040-based boxes.   
   >>   
   >> Has anyone done this? What Pi400 pins connect to the SWD port?   
   >>   
   >> Googling doesn't help. I have the RP400 Beginners Guide book and it   
   >> doesn't mention doing this.   
   >>   
   >> Anybody have links about doing this?   
   >   
   >https://www.electronicshub.org/programming-raspberry-pi-pico-with-swd/   
      
   It doesn't say so, but when he says "raspberry pi" I think he means a   
   Pi3. I'll be using a Pi4, inside the Pi400 unit, but I expect the pins   
   are the same on its 40-pin header.   
      
   Oh, I found a reference in the book "Programming the Raspberry Pi   
   Pico/w  in C".  Looks like the same pins, GPIO24(18) and GPIO25(22).   
      
   Thanks   
      
   I'm designing a PCB that will have a 40 pin ribbon cable connector to   
   the Pi400 and a 20-pin ribbon to the various RP2040 target boards. It   
   will do the debug connection and have a bunch of scope mux's and DVM   
   mux's and stuff, to make it easy to time code execution and check the   
   power supplies and such.   
      
   Looks like I can power my board from the 40 pin header too.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)   
   SEEN-BY: 15/0 19/38 90/1 105/81 106/201 128/260 129/305 135/225 153/7715   
   SEEN-BY: 218/700 226/30 227/114 229/110 112 113 200 206 307 317 400   
   SEEN-BY: 229/426 428 470 550 616 664 700 266/512 282/1038 291/111   
   SEEN-BY: 292/854 320/219 322/757 342/200 396/45 460/58 633/280 281   
   SEEN-BY: 633/412 418 420 509 2744 712/848 770/1 3 100 330 340 772/210   
   SEEN-BY: 772/220 230 5020/400 5075/35   
   PATH: 770/3 1 633/280 229/426