Distinguish two Controllers

sarah · ‎2016-01-13

Posted on January 13, 2016 at 11:03

Hello all,

how can i distinguish a stm32f405 from a stm32f415? Can i read this ID in a register somewhere on the controller?

Thanks for your help previously

Litina

Nesrine M_O · ‎2016-01-13

Posted on January 13, 2016 at 11:58

Hi litina,

The STM32F405/415 lines have the same device identifier, the main difference is that the STM32F415 integrates a crypto/hash processor.

So you can enable the clock of cryptographic module and then check the RCC_AHB2ENR register if the dedicated bit is set to 1 so it is 415 either its 405

-Syrine-

sarah · ‎2016-01-13

Posted on January 13, 2016 at 13:36

Hi Syrine,

thank you for your answer.

I enabled the clock of cryptographic modul on both controller types by writing 0x10 in the AHB2ENR register. Afterwards I read the register 0x40023834. In both cases I read an 0x10. Is that the wrong register?

Like expected on the 405 the coding didn't work and on 415 it worked.

But how can I distinguish without really testing the conding?

Radosław · ‎2016-01-13

Posted on January 13, 2016 at 14:38

This is good behavior. Write somthing to hash and read back. Clock bit in RCC still exists. But registers of HASH don't.