SWCLK idles high on STLink V3-MINIE; low on STLink V3-SET

kamnxt · ‎2026-04-09

Was trying to figure out an issue I was having with the SWDCLK pin, and realized there was a difference between the STLink V3-MINIE and the V3-SET.
When idle (either just plugged into a computer, or after programming), the SWDCLK idles high on the MINIE, while on the SET it idles low.
Is this an intentional difference? Is there any way to make the SWDCLK idle low on the MINIE as well?

Andrew Neil · ‎2026-04-09

Explained here by @S C

A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.

kamnxt · ‎2026-04-10

Ah... that explains things.
Considering there is no way to disable the level shifter, would have been nice if there at least was a way to choose if it should idle high or low.
Kind of a weird oversight considering ST also has some MCUs (for example in the G0 family) where the pin is used both as SWCLK and BOOT0...