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STM32F042 SWD IDCODE error

Question asked by gajdusek.josef.001 on Aug 22, 2015
Latest reply on Aug 24, 2015 by Clive One
I have a problem with debugging an STM32F042 board. When the debugger (ST Nucleo) asks for IDCODE, the MCU responds with an error (trace shown below). At first, I thought that the bootloader is the problem, so I flashed a bunch of zeroes onto the start of the flash to disable it, but it persists. Any clues on what might be causing this?swd-error.png