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flash programming disable

Abhishek_nr
Associate II

‎2025-02-28 4:59 AM - last edited on ‎2025-02-28 5:42 AM by

hello everyone..

I am using the STM32F429 Discovery board and want to prevent reprogramming of the internal flash after initially flashing the firmware. Once the code is programmed, it should continue to run normally, but no further programming access should be allowed. How can I achieve this? Please suggest an implementation method.

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Andrew Neil
Guru

‎2025-02-28 5:05 AM

See Read Protection (RDP) and/or Proprietary code readout protection (PCROP) in the Reference Manual.

Despite the names, they do also restrict writing to (ie, programming) the Flash ...

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.
TDK
Guru

‎2025-02-28 5:57 AM

Write 1 to the relevant write protection bits in the option bytes. This can be done in code or in STM32CubeProgrammer.

TDK_0-1740751016626.png

 

You can undo this to write code again.

If you want to permanently prevent access, set RDP level 2, which is quite restrictive and is irreversible.

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