hi, I am trying to use it in the same pin for two different purposes. I'm setting 4 pins for SPI comm and after I finish using them as SPIpins I need them as normal gpio. I tried to toggle them with set and reset but didn't go so well. what should I

[Gbasi.1]

for exmple, this is a part of the code:

void DAC_AD5621_Write ( uint64_t DAC_Data)

{

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

}

while (1)

 {

 HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5,GPIO_PIN_RESET);

 delay_1u(10);

 HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5,GPIO_PIN_SET);

}

[TDK]

Initialize them as GPIO output pins after using them as SPI. If they're still in AF mode, output level will be ignored.

[Gbasi.1]

hi, thank you for help.

can you sharpen the concept "AF mode"?

[JGerb]

You may just be able to change the MODER register to change them from AF (Alternate Function) to input or output mode, using MODIFY_REG(GPIOA->MODER,***,yyy) where *** is a suitable mask to turn those bits off, and yyy are bits to set in the register. Replace GPIOA with the I/O bank you are using - e.g. GPIOA/B/C etc.

[TDK]

> can you sharpen the concept "AF mode"?

Look up alternate function mode in the reference manual.