Is SWCLK required for SWD ?
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‎2022-05-04 02:40 AM
The four wire interface from the ST-LINK V2 has no clock.
Where does it say that ST devices do not require a clock for SWD ?
Also why is it seemingly impossible to work through a hub ? This makes life very difficult.
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‎2022-05-04 02:54 AM
ST link V2 4 pin connector is for STM8 SWIM single wire interface. Focus on the 20 pin connector.
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‎2022-05-04 02:51 AM
SWD = Arm Serial Wire Debug.
Minimal wirering is monodir clock from debug probe to target chip, swdio is a bi directional signal. Ground is of course needed. In low power mode, sometime the core needs a reset pulse which the debug probe optionally provide.
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‎2022-05-04 02:54 AM
ST link V2 4 pin connector is for STM8 SWIM single wire interface. Focus on the 20 pin connector.
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‎2022-05-04 06:31 AM
Indeed, the 4-pin connector is marked "STM8", and the 20-pin is marked "STM32" on the unit itself, and this is CLEARLY documented in the User Manual:
https://www.st.com/en/development-tools/st-link-v2.html#documentation