Posted by LaurentL on 2016-08-26 09:38

Hello,

STLink utility should be closed or at least not connected to the STLink of course.

And LIBUSB_ERROR_ACCESS seems exactly the message for that, it means the STLink has already opened the connection elsewhere.

And also close all other software that might connect to the STLink.

Check that you closed all debug sessions that might have still the STLink opened in SW4STM32.
Terminate the launch sessions with the red square (also in console window) and you can “Remove All Terminated launches” with the double cross button in console window.
Check you don’t have any openocd.exe running in background but that shouldn’t be the case.

The version of SW4STM32 plugins are ok.

So, seeing your messages, i made a mistake, the connection on STLink is done in “initializing PLDs”, not after.

Then, i don’t know, is it a custom board ?
If yes, did you connect the Reset line output from STlink to the STM32 reset input on your board ?

Rgds,
Laurent