H7 migration, send SPI without using HAL

[jean]

Hello dear community!

I've migrated from F7 to H7, everything fine so far.

To save CPU time I don't want to use HAL for sending two SPI bytes.

My F7 transmit SPI code was very simple and perfectly working :

SPI6->DR = byte_0;
SPI6->DR = byte_1;

But on the H7, the same code doesn't work :

SPI6->TXDR = byte_0;
SPI6->TXDR = byte_1;

In both F7 and H7 projects, this is always working (but time-consuming) :

HAL_SPI_Transmit(&hspi6, const_cast<uint8_t*>(buffer), 2, 1000);

Do you know why bypassing HAL is not possible on the H7 ?

Thanks!

Jean

[Andrew Neil]

Excellent - please mark that as the solution;

https://community.st.com/t5/community-guidelines/help-others-to-solve-their-issues/ta-p/575256

[pvsarath]

Hi Pavel A can you insert read & write functions.

[Pavel A.]

Something like this...

void SPI_TX_BYTE(uint8_t d)
{
    unsigned cnt = 20000;
    while (!LL_SPI_IsActiveFlag_TXP(SPIx)) {
        if (--cnt == 0) {
            Error_handler();
            return;
        }
    }
    LL_SPI_TransmitData8(SPIx, d);
}


uint8_t SPI_RX_BYTE()
{
    unsigned cnt = 20000;
    while (!LL_SPI_IsActiveFlag_RXP(SPIx)) {
        if (--cnt == 0) {
            Error_handler();
            return 0;
        }
    }

    return LL_SPI_ReceiveData8(SPIx);
}