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Why does enabling SPI peripheral in STM32 Nucleo L476RG change the master bit to 0?

Posted by lokii
4:03 am
21/11/2024

Guys I’m trying to implement the SPI in my stm32 Nucleo l476RG without hal drivers.

I have have implemented the spi configuration using spi_init function

then when it ready for the communication i enable the SPE: SPI enable using a seprate function which is

#define SPI_CR1_SPE            6

void SPI_PeripheralControl(SPI_RegDef_t *pSPIX, uint8_t EnOrDi)
{
    if(EnOrDi == ENABLE)
    {
        pSPIX->CR1 |= (1<<SPI_CR1_SPE);
    }
    else
    {
        pSPIX->CR1 &= ~(1<<SPI_CR1_SPE);
    }
}

the problem here is when pSPIX->CR1 |= (1<