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LeeK · 2023-10-27

Hi,Probably a dump question but wanted to make sure I got it right.On a STM32 MCU, lets sayPB0/PB1 (scl/sda) have AF4 as I2C1PB5/PB6 (scl/sda) have AF4 as I2C1If I configure all PB0/PB1/PB5/PB6 to use AF4 as I2C1,Enabling/reading/writing on I2C1 work...

LeeK · 2023-09-29

Hi,On a STM32 F7, I would like to lock access to the FLASH_CR by writing a wrong key to the FLASH_KEYR register. Writing a wrong key results in a bus fault (disabling the bus fault raises it to a hard fault).Could someone help me with a way to write ...

LeeK · 2023-10-29

It is a STM32F746.Thank you for the link. Really helpful.Ya dynamically changing the AF of the pins would work but was wondering the behavior with multiple pairs assigned to same I2C.

LeeK · 2023-10-02

Apologize waclawek.janadding a FLASH register read (an extra ldr got added in assembly) actually solved the issue. I had some older debug code which was masking your solution.I will try adding additional DSBs as you and Pavel suggested.

LeeK · 2023-10-02

Nope. Still enters the bus fault handler.

LeeK · 2023-09-30

Hi,Did you mean something like this?__set_FAULTMASK(1);FLASH->KEYR = 0;variable = FLASH->CR;SCB->SHCSR &= ~SCB_SHCSR_BUSFAULTPENDED_Msk;__set_FAULTMASK(0);Wondering how this disables the bus fault.

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Multiple GPIO same I2C peripheral/alternate function

STM32 F7: lock flash CR and avoid bus fault

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Re: STM32 F7: lock flash CR and avoid bus fault