Restore ST-Link Connection on B-L072Z-LRWAN1

Andrew Neil · ‎2022-05-10

In order to achieve minimum power drain on the B-L072Z-LRWAN1 discovery board, it is necessary to remove some solder bridges

See:

https://community.st.com/s/question/0D50X00009XkbSOSAZ/excess-current-consumption-running-bl072zlrwan1-from-battery

And:

https://community.st.com/s/question/0D50X00009q4M1zSAE/cant-power-bl072zlrwan1-with-battery

To be able to use the onboard ST-Link again, these connections need to be restored:

NRST: link CN4.3 to CN12.5;
SWD: fit two links on CN8;
VCOM: link CN5.1,2 to JP6.

Rather than have to mess about with 2 separate links for the SWD, a single-row 4-pin header can be adapted:

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.

Andrew Neil · ‎2022-05-10

It wasn't a question - just posting a tip.

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.

View solution in original post

Andrew Neil · ‎2022-05-10

It wasn't a question - just posting a tip.

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.