[STM32U545] OSPI write only

[Loïc1]

Hello,

I'm working on a projet where I need to drive 4 (or 2 x 4) GPIO at the same time with high speed on the STM32U545RE.

I'm trying to use the DualQuad SPI (with OSPI) but I can't have the clock working...

At first I tried to write a code with a send only type of frame (with no instruction and no address) but nothing was working.

Now I tried to use the example code from a STM32L5 but nothing seem to be working either.

Can you if someone already tried to do that ?

BR,

Loïc

[KDJEM.1]

Hello @Loïc1 and welcome to the community,

Could you please give more details about the use case.

Which memory are you using?

Could you please share your configuration?

I recommend you to look at these examples:

• STM32CubeU5/Projects/STM32U575I-EV/Examples/OCTOSPI at main · STMicroelectronics/STM32CubeU5 · GitHub
• STM32CubeG4/Projects/STM32G474E-EVAL/Examples/QSPI/QSPI_MemoryMappedDual at master · STMicroelectronics/STM32CubeG4 · GitHub

Thank you.

Kaouthar

[Loïc1]

Hi @KDJEM.1  Thank you for your quick answer.

The only thing I can say about the use case is that I don't use any kind of memory, I have a NUCLEO-U545REQ and I need to drive at high speed rate 4 I/O (or 8 I/O) at the same time.

I need to have a clock at 40MHz, and the other I/O at the same speed or faster.

I though the OSPI was the best option to do that but the problem is I need to use the QSPI (or OSPI) as a custom parallel serializer, and for that I need to use a send only system, with no opcode of anykind, only data.

Thank you,

Loïc

[KDJEM.1]

Hello @Loïc1 ;

I recommend you to look at OCTOSPI examples and AN5050 and get inspired to configure your project.

Do you need a fast slave interface with high throughput?, you can use a PSSI interface.

Thank you.

Kaouthar