09. ST LINK faq

ST-LINK FAQ

Is ST-LINK The Same As USB?

No. ST-LINK is a USB adapter that talks to the MCU through SWD pins.

Do I Need A Genuine ST-LINK?

No. Most users use clone adapters with mode B.

A genuine adapter can make reset handling cleaner, but it is not required for the common clone C45 workflow.

Can ST-LINK Power The VCU?

Sometimes a setup may use 3.3 V from ST-LINK, but this depends on the board and model guide.

Do not connect main power and ST-LINK 3.3 V at the same time unless the guide explicitly says to.

Why Does Wiring Matter So Much?

OpenOCD errors often look like software errors, but many failures are weak contact, swapped pins, missing ground, bad USB cables, or unstable reset timing.

What Should I Test First?

Run a full 128 KB dump before flashing anything.