STM32H SPI low lever transfer

[ali_asadzadeh]

Hi,
I want to transfer 8bit data in Register mode, using STM32H,
here is my code snippet,

void SPIData8(int data){
SPI4->TXDR = data;
SPI4->CR2 = 1;
SPI4->CR1 = SPI_CR1_CSTART;
while(SPI4->SR & (SPI_SR_EOT));
}

But, this code does not work! any Ideas?

[Sal Ammoniac]

Please define “does not work”. We don’t have crystal balls...

[ali_asadzadeh]

Please define “does not work”. We don’t have crystal balls...

It does not make any SPI transaction

[Mecanix]

Need to see your main() and how you init the clock and spi modes. Have a look at the generic driver (stm32h7xx_ll_spi.h) and see if you haven't missed anything...

[Sal Ammoniac]

Yes, please show us all of your code.

The documentation for the SPI peripheral in the STM32H7 series is utter crap and reads like it was written by an eight year old for whom English is their fifth language.

[Mecanix]

The documentation for the SPI peripheral in the STM32H7 series is utter crap and reads like it was written by an eight year old for whom English is their fifth language.

LL's #UM2217
https://www.st.com/resource/en/user_manual/dm00392525-description-of-stm32h7-hal-and-lowlayer-drivers-stmicroelectronics.pdf

[Sal Ammoniac]

The documentation for the SPI peripheral in the STM32H7 series is utter crap and reads like it was written by an eight year old for whom English is their fifth language.

LL's #UM2217
https://www.st.com/resource/en/user_manual/dm00392525-description-of-stm32h7-hal-and-lowlayer-drivers-stmicroelectronics.pdf

That’s the documentation for the Hal and the LL drivers. I was referring to the description of the SPI peripheral in the STM32H7 Reference Manual. You know, the one that describes the operation of the peripheral at the register level?

Not everyone uses ST’s libraries—some of us write our own. Sometimes this is more difficult than it needs to be due to shitty documentation from the vendor. IMO, there’s no excuse for this. These documents should be written by a collaboration between technical writers and the engineers who designed the chip, and either the technical writer should be a native English speaker, or the entire document should be proofread by a native English speaker. The document I’m referring to above has so many grammatical and phrasing errors that it’s very difficult to extract the meaning from the text.

[jnz]

I'm going with he didn't turn the clocks on to the SPI and GPIO peripherals.

[ali_asadzadeh]

I'm going with he didn't turn the clocks on to the SPI and GPIO peripherals.

The clocks are On,do not worry,
Have you done any Direct register SPI transfer in H series? if so, please share the code.

[jnz]

I'm going with he didn't turn the clocks on to the SPI and GPIO peripherals.

The clocks are On,do not worry,
Have you done any Direct register SPI transfer in H series? if so, please share the code.

I didn't see that when you posted your code.