SPI Transmit and Receive in STM32F207ZGT6

[vbk22398]

int main(void)

{

HAL_Init();

SystemClock_Config();

MX_GPIO_Init();

MX_SPI1_Init();

MX_USART3_UART_Init();

/* USER CODE BEGIN 2 */

----> HAL_SPI_Receive_IT(&hspi1, (uint8_t*) &rx_data, sizeof(rx_data));

/* USER CODE END 2 */

while (1)

{

HAL_SPI_Transmit(&hspi1, (uint8_t*) &test,sizeof(test), HAL_MAX_DELAY);

delay(10000);

}

}

I use SPI1 module in FullDuplexMaster Mode.
I use interrupt to receive data from the SPI Slave.
The Thing is that if I add the Line which is arrowed--->HAL_SPI_Receive_IT(), the sending is not happening.
I want to know why this is happening. help me why?

Thank You

[STTwo-32]

Helll @vbk22398 

I suggest you to take a look at this example to understand how it works.It should be helpful on your case.

Best Regards.

STTwo-32 

[AScha.3]

Try with (only using) : 

HAL_SPI_TransmitReceive(..);

on full duplex spi, always both happen together, transmit and receive, see rm :

[gbm]

Use HAL_SPI_TransmitReceive().