How to ensure that an SPI master sends exactly 16 clock pulses to the slave?

Question

I'm using this current sensor: TLI4970-D050T4 According to the datasheet:

How can the SPI master send exactly 16 clock pulses to the slave, so I don't receive the 0's?

When I'm reading this sensor, I get a lot of 0's. So, I thought that it might be the reason, that I'm sending more than 16 clocks pulses. I'm using an STM32 Nucleo running at 2 MHz, but the SPI clock has been prescaled to 1 MHz. I would appreciate any advice. This is the code that I use to read the sensor and calculate current:

while (1)
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET);
HAL_SPI_Receive(&hspi1, (uint8_t *)&SPIRx, 2, 10);
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET);
motorCurrent=motor_current();

float motor_current() {

    float Iout;
    float BIout;
    int16_t Bit15;
     Bit15 = SPIRx&0x8000;
            if(Bit15==0x8000){
                HAL_GPIO_WritePin(GPIOB, GPIO_PIN_4, GPIO_PIN_SET);
            }
            else {
                BIout= SPIRx&0x1FFF;
                Iout = (BIout-4096)/80;
            }
        return Iout;
     }

Answer 1

You are using HAL_SPI_Receive() wrong, second parameter should be your buffer not SPI register. Other potential problem is that you have short timeout (fourth parameter) with slow SPI clock.

You can also make living easier if you look at your hspi1 configuration and change data size to 16 bits.

EDIT

If second parameter is your buffer and not SPI register, that I would still increase timeout and check if HAL_SPI_Receive() return success or error.