Core Lock Up – Every Other Flash | Carmine Noviello - A blog about programming and electronics

Participant

Hello,

When flashing my MCU, I get a message that the core is locked up every other time that I flash using STM32CubeProgrammer. Can anyone help with why this is happening?

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dmartins

Participant

I was having the same problem. Changing “Reset mode” to “Hardware reset” on the ST-LINK configuration seems to have fixed it for me.

UM2237 on st.com, is the user guide for STM32 CubeProgrammer, which says this about the reset modes:

– Software system reset: Resets all the STM32 components except the debug via
the Cortex-M Application Interrupt and Reset Control Register (AIRCR).
– Hardware reset: Resets the STM32 device via the nRST pin. The RESET pin of the JTAG connector (pin 15) should be connected to the device reset pin.
– Core reset: Resets only the core Cortex-M via the Application Interrupt and Reset
Control Register (AIRCR).

https://www.st.com/content/ccc/resource/technical/document/user_manual/group0/76/3e/bd/0d/cf/4d/45/25/DM00403500/files/DM00403500.pdf/jcr:content/translations/en.DM00403500.pdf

I’m just getting started with STM32 so I can’t explain why software reset only works every other time, but hardware reset seems to work much more reliably.