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hardware-test-setup.md

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Hardware Test Setup (Picoprobe + Pico Target)

This guide documents a practical hardware setup for integration and deployment tests.

Goal

Use one RP2040 board as a debug probe (Picoprobe firmware) and one raspberry pi nano board as the target.

The host PC is connected by USB to:

  • the probe board
  • the target board

In addition, the probe UART is connected to target UART pins 1-3, and probe SWD is connected to target SWD.

Realistic wiring diagram

 PC USB #1 ------------------------------> Probe Pico (Picoprobe firmware)
 PC USB #2 ------------------------------> Target Pico (device under test)


 Probe Pico header pins (physical)                 Target Pico header pins (physical)
 ------------------------------------------------  -----------------------------------
 pin 4  (GP2  / SWCLK) -------------------------->  SWCLK debug pin
 pin 5  (GP3  / SWDIO) <------------------------->  SWDIO debug pin
 pin 8  (GND) ----------------------------------->  GND debug pin

 pin 6  (GP4  / UART TX) ------------------------>  pin 2 (GP1 / UART0_RX)
 pin 7  (GP5  / UART RX) <------------------------  pin 1 (GP0 / UART0_TX)
 pin 8  (GND) ----------------------------------->  pin 3 (GND)

Connection table

UART wiring to target Pico (requested pin set 1-3)

Target Pico pin Signal Connect to probe
1 GP0 / UART0_TX Probe RX
2 GP1 / UART0_RX Probe TX
3 GND Probe GND

SWD wiring to target Pico debug pins

Target signal Connect to probe
SWCLK Probe SC / SWCLK
SWDIO Probe SD / SWDIO
GND Probe GND

On Pico/Pico W, SWD uses dedicated debug pads/pins (not the 1..40 GPIO header).

If the probe is another Pico running debugprobe_on_pico

Probe Pico mapping with physical pin numbers:

Probe Pico physical pin GPIO Role
4 GP2 SWCLK
5 GP3 SWDIO
6 GP4 UART TX (to target RX pin 2)
7 GP5 UART RX (from target TX pin 1)
8 GND Ground

Practical notes

  • Keep a common ground between probe and target before attaching signal lines.
  • UART must be crossed (TX -> RX, RX -> TX).
  • SWDIO is bidirectional; connect it as a single data line between probe and target.
  • Keep both boards at 3.3V logic.
  • For this repository:
    • integration tests mainly use target USB CDC
    • deployment tests use SWD operations (probe-rs) and USB behavior checks

References