Why OCTOSPI registers aren't accessible on NUCLEO-L4R5ZI-P?

[AGEBE.1]

Hi,

I'm trying to configure manually OCTOSPI registers in order to implement Hyperbus protocol but when I try to write registers it has no effect...

I'm using that command:

OCTOSPI1->CR = OCTOSPI1->CR | (0x1 << 0);

But the register keep it's value 0.

[Imen.D]

Hello @AGEBE.1​ ,

Have a look at this article, which will help you to configure OctoSPI, it's applicable for STM32L4 series.

Imen

[Tesla DeLorean]

Can you see any other registers, are they all zero?

Make sure all clocks are enabled

1. //enable peripherals
2. RCC->AHB3ENR |= RCC_AHB3ENR_OSPI1EN;
3. RCC->AHB2ENR |= RCC_AHB2ENR_OSPIMEN;

On H7 there's also IOMNGREN (AHB3) OCTOSPI*M*

[AGEBE.1]

The other peripherial was all zero yes.

But thank you, you solved my problem!

[AGEBE.1]

But where did you find this information?

I can't find the bit associated to OSPI. According to stm32l4r5xx.h file, this bit is supposed to be the 8th of this register:

#define RCC_AHB3ENR_OSPI1EN_Pos             (8U)

[Tesla DeLorean · Accepted solution]

>>But where did you find this information?

I understand the problem space, an elephant with a tesseract if you will..

https://www.st.com/resource/en/reference_manual/dm00310109-stm32l4-series-advanced-armbased-32bit-mcus-stmicroelectronics.pdf

[AGEBE.1]

Thanks a lot!