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
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?
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.
What debug software are you planning to use? OpenOCD?
The pinout seems to be quite flexible - look at interface/raspberrypi-gpio-connector.cfg in the OpenOCD sources / distribution.
If you want something nice with level translation that handles power sequencing between Pi and Target board, the JTAG Hat should do what you want:
cu Michael
It is linked in the description:
cu Michael
This is a first pass at the dev board.
The pushbuttons look primitive but will probably work.
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