stm32g031:trying to communicate with MC33HB2000EX over SPI

[SGian.1]

Hi there !

here i'm for another question, are a day i'm go crazy with the SPI interface . I try to comunicate with MC33HB2000EX 10 A H-bridge, SPI programmable brushed DC motor driver. The datasheet write that:

So i configure my SPI :

and when i send data with 

uint16_t spiData=0x2000;
uint16_t spiRxData = 0x0000;

i reset the CS pin

HAL_SPI_TransmitReceive_IT(&hspi1,(uint8_t*)&spiData,(uint8_t*)&spiRxData,1);

i wait the callback function and i set the CS pin 

no one data come out from MISO and i put on my analaizer and i don't understand why the clock start to logic high and no from logic low i don't know if is the real problem 

I hope someone can help me 

Thank you 

Sergio

[AA1]

First you need to understand how SPI works. To receive, you need to send something. I only see 16 clocks.

Try this:

// send command
HAL_SPI_Transmit_IT(&hspi1,(uint8_t*)&spiData,1);

// receive response
HAL_SPI_TransmitReceive_IT(&hspi1,(uint8_t*)&spiData,(uint8_t*)&spiRxData,1);

[SGian.1]

i try but still dosen't work 

from the datasheet

and i configurate my SPI in this way :

CPOL = low

CPHA 0 2 Edge 

Baud rate 500Khz

and my code is very simple

void HAL_SPI_TxRxCpltCallback(SPI_HandleTypeDef * hspi)
{
  
	test=1;
}
void HAL_SPI_TxCpltCallback(SPI_HandleTypeDef * hspi)
{
    test=1;
}

HAL_Delay(500);
HAL_GPIO_WritePin(GPIOA, SPI1_CS_Pin, GPIO_PIN_RESET);
HAL_SPI_Transmit_IT(&hspi1,(uint8_t*)&spiData,1);
while(test==0);
test=0;
HAL_SPI_TransmitReceive_IT(&hspi1,(uint8_t*)&spiData,(uint8_t*)&spiRxData,1);
while(test==0);
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }

[AA1]

As you did before, you should send 0x2000 and you are sending 0x0000.

[SGian.1]

Sorry, in the last post i try to send 0x0000 is another register , is correct what i did but still don't work. I find one doument on internet and this say 

what confuse me is CPOL and CPHA 

[AA1 · Accepted solution]

How do you know it doesn't work?

Show the signals.

I think CPOL = 0 (low) and CPHA = 1 (2nd edge). The other possibility is CPOL = 0 and CPHA = 0.

Maybe 0x2000 is not the right command.