hi guys, I'm working with stm32l412kb and I'm having an issue. I want to talk SPI with 2 components I have. I want to communicate with one of those 2using the SPI machine and with the 2nd i want to bit-banging (same pins connected). what should I do?

[Gbasi.1]

HAL_GPIO_WritePin(dac_cs_GPIO_Port, dac_cs_Pin, GPIO_PIN_RESET);////Select SPI

DAC_Data = (DAC_Data&0x0FFF)<<2 ;

uint8_t DAC_Data1= (uint8_t)((DAC_Data>>8)&0x00FF);

uint8_t DAC_Data2= (uint8_t)(DAC_Data&0x00FF);

HAL_SPI_Transmit(&hspi1,DAC_Data1,10,100);

HAL_SPI_Transmit(&hspi1,DAC_Data2,10,100);

HAL_GPIO_WritePin(dac_cs_GPIO_Port, dac_cs_Pin, GPIO_PIN_SET);//Deselect SPI

int BitNo;

dis_intrpt ; //Stop interrupts

//***************** bits banging*****************

if(RegAdd&(0x01<<5)) {MOSI_H;}// mosi_h means mosi=1

else MOSI_L;//Assert 6th address bit to MOSI line// mosi_l means mosi=0

HAL_GPIO_WritePin(GPIOA, spi_cs_Pin, GPIO_PIN_SET); //Select SPI

//EA=0; //Stop interrupts

for(BitNo=5;BitNo>0;BitNo--)

{

delay_1u(10);

SCLK_H;delay_1u(10); //Raise clock and wait H width

SCLK_L; //Lower clock and

if(RegAdd&(0x01<<(BitNo-1))) {MOSI_H;}

else MOSI_L;//Assert Reg add bit to MOSI line

}

[berendi]

Set the SCLK and MOSI pins as GPIO output before bit-banging in the GPIO MODER register. Set them back to alternate mode when using the SPI controller.

Check the datasheet of the bit-banged slave. Does it really require CS high during transmit?

BTW the SPI controller should support 6 bit transfers, check the description of SPI control register 2 (SPIx_CR2) in the reference manual.