05. Connection modes

5. Connection Modes

The launcher has three persistent connection modes. The selected mode stays active until you change it.

A - Default / Blinker Buttons

Use this when the SWD interface is available.

SWD may be available because:

• the current firmware does not disable it;
• the VCU was powered while holding the turn indicator buttons, entering a service mode where SWD is available.

Try this mode first if you expect normal SWD access to work.

B - C45 / Clone ST-Link

Use this with common clone ST-LINK adapters.

Many clone adapters do not have a working reset pin. Mode B uses a guided connect-under-reset procedure instead. The launcher tells you when to connect C45 to GND and when to release it.

This is the most common mode because clone ST-LINK adapters are easy to buy.

C - C45 / Genuine ST-Link

Use this with a genuine ST-LINK adapter that has a working reset pin.

The adapter reset pin connects to the MCU nRST line. On these VCUs, that reset line is available at capacitor C45.

T - Countdown Timer

Mode B also shows:

[T] Set countdown timer

Use this if you need more or less time during the manual C45-to-GND steps.