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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" ?


```
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).