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Add warning for signal line connections on debug probe #4230

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Add warning for signal line connections on debug probe #4230

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Add warning for signal line connections
Manu3l0us Oct 28, 2025
1f89bdf
Update documentation/asciidoc/microcontrollers/debug-probe/introducti…
Manu3l0us Oct 28, 2025
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2 changes: 2 additions & 0 deletions documentation/asciidoc/microcontrollers/debug-probe/introduction.adoc
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Expand Up @@ -34,6 +34,8 @@ Yellow:: RX/SD (Input to Probe or I/O)

While the cable with three-pin JST-SH connectors is intended to be used with the https://rpltd.co/debug-spec[standard three-pin connector] which newer Raspberry Pi boards use for the SWD debug port and UART connectors.

WARNING: When the target is powered from a separate power source or computer, ensure a common reference before connecting signal lines. Either remove power from the target or connect GND between the target and the Raspberry Pi Debug Probe first; only after GND is connected may you attach RX, TX, SC, and SD. Potential voltage differences between the two systems can cause damage to the probe.

The Debug Probe has five LEDs, a red LED to indicate power, and four more activity indicator LEDs

image::images/debug-leds.png[width="70%"]
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