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docs: Add debug probe pinout to README #205

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15 changes: 15 additions & 0 deletions README.md
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Expand Up @@ -83,3 +83,18 @@ To enable AutoBaud, configure the USB CDC port to the following custom baud rate

Changing the baud rate to any other value disables AutoBaud.

## Debugprobe Pinout

The Debug Probe pinout is as follows:

@lurch lurch Jun 10, 2026

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This isn't the "Debug Probe pinout" as the Debug Probe is this: https://www.raspberrypi.com/products/debug-probe/ 😉

This is the pinout for "a Pico running the debugprobe_on_pico.uf2 firmware" ?

@katshann-raspberry katshann-raspberry Jun 12, 2026

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Also duplication of info from the datasheet

@lurch Would the correct info be that which is on p17 of the current published datasheet?

@lurch lurch Jun 14, 2026

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It depends what the intention of this PR is...

  • If the intention is to document how to wire up a Debug Probe to a Pico H or Pico WH (which is what the header above implies) then the instructions on page 17 of the Getting-Started PDF are correct. (Note that there's already a separate issue for wiring up a Debug Probe to a non-H Pico).
  • If the intention is to document how to use one Pico to debug another Pico (which is what the content below implies), then the instructions on page 19 of the PDF are correct.


```
Pico A (Debugger) -> Pico B (System Under Test)

Pico A GND -> Pico B GND
Pico A GP2 -> Pico B SWCLK
Pico A GP3 -> Pico B SWDIO
Pico A GP4/UART1 TX -> Pico B GP1/UART0 RX
Pico A GP5/UART1 RX -> Pico B GP0/UART0 TX
```

More details can be found in Appendix A of the [Raspberry Pi Pico Getting Started Guide](https://datasheets.raspberrypi.com/pico/getting-started-with-pico.pdf).

@lurch lurch Jun 14, 2026

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This link should now be https://pip.raspberrypi.com/documents/RP-008276-DS