Solved
STM32 SPI Cant Set SSM Bit
Hi, Im new to STM32 and Im writing a bare metal spi library however for some reason when I try to change the SSM bit in code it doesnt seem to work. Im able to change the SSM bit in debug mode.
void SPI_Enable(SPI_Com* spi)
{
SPI1_CLK_EN;
//Reset the whole CR1 register if someone decides to enable it using different options
//First disable SPI
spi->spiReg->SPI_CR1 &= ~(1 << 6);
spi->spiReg->SPI_CR1 = 0;
//CPOL and CPHA
spi->spiReg->SPI_CR1 |= (spi->spiConfig.CPHA);
spi->spiReg->SPI_CR1 |= (spi->spiConfig.CPOL << 1);
//Master, Slave mode
spi->spiReg->SPI_CR1 |= (spi->spiConfig.masterMode << 2);
//Set baud rate
spi->spiReg->SPI_CR1 |= (spi->spiConfig.baudRate << 3);
//MSB or LSB first
spi->spiReg->SPI_CR1 |= (spi->spiConfig.isLSB << 7);
//Data format
spi->spiReg->SPI_CR1 |= (spi->spiConfig.dataFormat << 11);
//Software Slave SSM and SSI bits
//spi->spiReg->SPI_CR1 |= (spi->spiConfig.isSoftwareSlave << 9);
spi->spiReg->SPI_CR1 |= (1 << 9);
spi->spiReg->SPI_CR1 |= (1 << 8);
//Set duplex modes
switch(spi->spiConfig.duplexMode)
{
case FULL_DUPLEX_MODE:
//You dont have to change since by default its in full duplex mode
break;
case HALF_DUPLEX_MODE:
spi->spiReg->SPI_CR1 |= (1 << 15);
break;
case RECIEVE_ONLY_MODE:
spi->spiReg->SPI_CR1 |= (1 << 10);
break;
}
//Bidi mode
spi->spiReg->SPI_CR1 |= (spi->spiConfig.bidiMode << 14);
//Set CS to high
SetOutputAdress(spi->CS, 1);
//Set busy to 0
spi->isBusy = 0;
spi->spiReg->SPI_CR1 |= (1 << 6);
}