Been working on the Nucleo H5 dev board for about a month. Everything with the built-in ST-Link/V3 was fine until randomly yesterday, the board would no longer get out of reset when the ST-Link is powered.
Board powers up and boots if getting power from the USB-OTG port AND the ST-Link is unplugged. Tried with STProgrammer and GDB in VSCode debugger, neither can connect to the target chip. To be clear, the STLink enumerates and works OK, but the MCU is held in reset state.
Board is held in reset state when ST-Link gets power/host connection. Attempting to flash the board always gives "Reason: Target held under reset.".
All solder jumpers and physical jumpers are in the default positions
Fixes I've tried:
- Any set of settings via the STProgrammer, including Soft Reset, the "under reset" connection type, etc. Any time STLink is powered from host, the board is held reset and will not connect still.
- Updating the STLink/V3 drivers/firmware multiple times.
- Connecting the STLink in hot--plug mode, which still holds board in reset state when powered.
- Shorting, holding the STLink reset jumpers during power up, etc.
Issue randomly started after seemingly no specific cause.
