SPI zwischen STM32 und ESP8266

  hspi4.Instance = SPI4;

  hspi4.Init.Mode = SPI_MODE_MASTER;

  hspi4.Init.Direction = SPI_DIRECTION_2LINES;

  hspi4.Init.DataSize = SPI_DATASIZE_8BIT;

  hspi4.Init.CLKPolarity = SPI_POLARITY_LOW;

  hspi4.Init.CLKPhase = SPI_PHASE_1EDGE;

  hspi4.Init.NSS = SPI_NSS_SOFT;

  hspi4.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;

  hspi4.Init.FirstBit = SPI_FIRSTBIT_MSB;

  hspi4.Init.TIMode = SPI_TIMODE_DISABLE;

  hspi4.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;

  hspi4.Init.CRCPolynomial = 7;

  hspi4.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;

  hspi4.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;

  if (HAL_SPI_Init(&hspi4) != HAL_OK)

  {

    Error_Handler();

  }

  // ...

  GPIO_InitTypeDef GPIO_InitStruct = {0};

  if(spiHandle->Instance==SPI4)

  {

    /* SPI4 clock enable */

    __HAL_RCC_SPI4_CLK_ENABLE();

    __HAL_RCC_GPIOE_CLK_ENABLE();

    /**SPI4 GPIO Configuration    

    PE2     ------> SPI4_SCK

    PE5     ------> SPI4_MISO

    PE6     ------> SPI4_MOSI 

    */

    GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_5|GPIO_PIN_6;

    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

    GPIO_InitStruct.Pull = GPIO_NOPULL;

    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;

    GPIO_InitStruct.Alternate = GPIO_AF5_SPI4;

    HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);

  }

  NSS_LO;

  rc = HAL_SPI_TransmitReceive(&hspi4, txbuf, rxbuf, SIZE, TIMEOUT);

  NSS_HI;