what's the problem?

[idrissmc]

hello everyone,

can someone help me please, I can't understand why I can't receive 7, it's weird...

I sent 7 , i want to receive 7, but I receive 255, 0, 15.. all the values except 7, that's really insane.

[idrissmc]

this code for the F413H:

void HAL_SPI_MspInit(SPI_HandleTypeDef* hspi)

{

 GPIO_InitTypeDef GPIO_InitStruct = {0};

 if(hspi->Instance==SPI3)

 {

 /* USER CODE BEGIN SPI2_MspInit 0 */

 /* USER CODE END SPI2_MspInit 0 */

  /* Peripheral clock enable */

/*Enable SPI clock*/

  __HAL_RCC_SPI3_CLK_ENABLE();

  /*Enable GPIO SPI clock*/

  __HAL_RCC_GPIOB_CLK_ENABLE();

  /**SPI2 GPIO Configuration

  PB4   ------> SPI3_MISO

  PB5   ------> SPI3_MOSI

  PB12   ------> SPI3_SCK

  */

  GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_12;

  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

  GPIO_InitStruct.Pull = GPIO_NOPULL;

  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;

  GPIO_InitStruct.Alternate = GPIO_AF5_SPI3;

  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*GPIO_InitStruct.Pin = GPIO_PIN_12;

  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

  GPIO_InitStruct.Pull = GPIO_PULLUP;

  GPIO_InitStruct.Speed = GPIO_SPEED_FAST;

  GPIO_InitStruct.Alternate = GPIO_AF5_SPI3;

  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);*/

 /* USER CODE BEGIN SPI2_MspInit 1 */

 /* USER CODE END SPI2_MspInit 1 */

 }

}

static void MX_GPIO_Init(void)

{

GPIO_InitTypeDef GPIO_InitStruct = {0};

__HAL_RCC_GPIOA_CLK_ENABLE();

  /*Enable GPIO SPI clock*/

  __HAL_RCC_GPIOB_CLK_ENABLE();

  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_15, GPIO_PIN_RESET); // CS

GPIO_InitStruct.Pin = GPIO_PIN_15;

GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;

GPIO_InitStruct.Pull = GPIO_NOPULL;

GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;

HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

this code for the f411E:

void HAL_SPI_MspInit(SPI_HandleTypeDef *hspi)

{

 GPIO_InitTypeDef GPIO_InitStruct;

 /* Enable GPIO TX/RX clock */

 SPIx_SCK_GPIO_CLK_ENABLE();

 SPIx_MISO_GPIO_CLK_ENABLE();

 SPIx_MOSI_GPIO_CLK_ENABLE();

 /* Enable SPI clock */

 SPIx_CLK_ENABLE(); 

 /* SPI SCK GPIO pin configuration */

 GPIO_InitStruct.Pin    = SPIx_SCK_PIN;

 GPIO_InitStruct.Mode   = GPIO_MODE_AF_PP;

 GPIO_InitStruct.Pull   = GPIO_NOPULL;

 GPIO_InitStruct.Speed   = GPIO_SPEED_FREQ_VERY_HIGH;

 GPIO_InitStruct.Alternate = SPIx_SCK_AF;

 HAL_GPIO_Init(SPIx_SCK_GPIO_PORT, &GPIO_InitStruct);

 GPIO_InitStruct.Pin = SPIx_MISO_PIN;

 GPIO_InitStruct.Alternate = SPIx_MISO_AF;

 HAL_GPIO_Init(SPIx_MISO_GPIO_PORT, &GPIO_InitStruct);

 GPIO_InitStruct.Pin = SPIx_MOSI_PIN;

 GPIO_InitStruct.Alternate = SPIx_MOSI_AF;

 HAL_GPIO_Init(SPIx_MOSI_GPIO_PORT, &GPIO_InitStruct);   

}

static void MX_GPIO_init(void)

 {

GPIO_InitTypeDef GPIO_InitStruct = {0};

__HAL_RCC_GPIOA_CLK_ENABLE();

//__HAL_RCC_GPIOE_CLK_ENABLE();

__HAL_RCC_GPIOB_CLK_ENABLE();

HAL_GPIO_WritePin(GPIOB, GPIO_PIN_9, GPIO_PIN_RESET);

GPIO_InitStruct.Pin = GPIO_PIN_1;

GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;

GPIO_InitStruct.Pull = GPIO_NOPULL;

HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_9;

GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;

GPIO_InitStruct.Pull = GPIO_NOPULL;

GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;

HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

what do you think about the configuration?

[oleksandr.karbivsky]

What with SPI configuration? Who master, who slave?

[JChau]

I don't see any problem in my eyes, I still suspect this is hardware problem because sending and receiving 1 byte shouldn't be that problematic. Please confirm if data is correctly put into the wire with a oscillator/multimeter/logic analyzer(one easy way is to send 170 instead of 7, in that case miso pin has a frequency=CLK/2 and duty cycle=50%), if no it is sending software problem, but if yes than it is wire/receiver software problem.

[idrissmc]

@oleksandr.karbivsky​  the F413H is the slave and the F411E is the master!

[idrissmc]

@JChau​  I'll see that, else I'll use the CAN bus and I'll try with UART too

[oleksandr.karbivsky]

Share SPI configuration for both devices.

[JChau]

Yes please, because you have three unknown parts in your situation, sender/wire/receiver, so it is better to isolate the no-problem part 1 by 1.

[idrissmc]

@JChau​  if it’s the receiver is there any solution?

[idrissmc]

@oleksandr.karbivsky​  I described it above

[JChau]

You confirmed signal bits arrived the receiver correctly? If that's the case the only solution is to check the receiver code, you can also add a breakpoint in stm32f4xx_hal_spi.c line 697 and check the DR register by yourself when receiving in F413H. btw line 697 should reads like this:

/* Check the RXNE flag */
      if(__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_RXNE))
      {
        /* read the received data */
        (* (uint8_t *)pData)= *(__IO uint8_t *)&hspi->Instance->DR; //<--THIS LINE
        pData += sizeof(uint8_t);
        hspi->RxXferCount--;
      }

if DR register is indeed 0, it means hardware do really receive 0 so you must check again sender/wire. BTW you can also check DR in transmit in line 552 (in this case evaluate (*pData) in expression panel instead):

while (hspi->TxXferCount > 0U)
    {
      /* Wait until TXE flag is set to send data */
      if(__HAL_SPI_GET_FLAG(hspi, SPI_FLAG_TXE))
      {
        *((__IO uint8_t*)&hspi->Instance->DR) = (*pData); //<--THIS LINE
        pData += sizeof(uint8_t);
        hspi->TxXferCount--;
      }

 EDIT: Sorry my bad, TX line is wrong, updated.