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c - STM32主/从SPI通信使用HAL_SPI_TransmitReceive()

问题描述

我正在尝试使用 HAL_SPI_TransmitReceive() 测试 SPI 主机，因为我将与 SPI 从机进行通信。SPI 从设备尚不可用。我有两个正在使用的 STM32F4 NUCLEO。一个将是主设备，一个假装是从设备。我已将它们连接在一起并使用以下代码：

Master_main.c

SPI_HandleTypeDef hspi2;

static void MX_SPI2_Init(void);

uint8_t spi_tx_data[9];
uint8_t spi_rx_data[9];

int main(void)
{
  MX_SPI2_Init();

  spi_tx_data[0] = 0;
  spi_tx_data[1] = 0;
  spi_tx_data[2] = 0;
  spi_tx_data[3] = 0;
  spi_tx_data[4] = 0;
  spi_tx_data[5] = 0;
  spi_tx_data[6] = 0;
  spi_tx_data[7] = 0;
  spi_tx_data[8] = 1;

  while (1)
  {
      static HAL_StatusTypeDef spi_error = HAL_OK;

      static uint32_t PreviousTicks_GreenLight = 0U;
      uint32_t CurrentTicks_GreenLight = HAL_GetTick();
      if((CurrentTicks_GreenLight - PreviousTicks_GreenLight) >= 500u)
      {
          HAL_GPIO_TogglePin(LD1_GPIO_Port, LD1_Pin);
          PreviousTicks_GreenLight = CurrentTicks_GreenLight;
      }

      static uint8_t runonce = 0;
      if (HAL_GPIO_ReadPin(USER_Btn_GPIO_Port, USER_Btn_Pin) != 0) {
          if (runonce != 1){

              HAL_GPIO_WritePin(GPIO_ADR1_GPIO_Port, GPIO_ADR1_Pin, 0);
              HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
              spi_error = HAL_SPI_TransmitReceive(&hspi2,spi_tx_data, spi_rx_data,18,0x01);
              HAL_Delay(1);
              HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
              HAL_GPIO_WritePin(GPIO_ADR1_GPIO_Port, GPIO_ADR1_Pin, 1);

              runonce = 1;
          }
      } else {
          runonce = 0;
      }

      static uint32_t PreviousTicks_RedLight = 0U;
      uint32_t CurrentTicks_RedLight = HAL_GetTick();
      if((CurrentTicks_RedLight - PreviousTicks_RedLight) >= 500u)
      {
          if ( spi_error == HAL_TIMEOUT || spi_error == HAL_ERROR){
              HAL_GPIO_TogglePin(LD3_GPIO_Port, LD3_Pin);
          } else {
              if ( spi_rx_data[8] == 2){
                  HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
              }
          }
          PreviousTicks_RedLight = CurrentTicks_RedLight;
      }
  }
}

static void MX_SPI2_Init(void)
{
  hspi2.Instance = SPI2;
  hspi2.Init.Mode = SPI_MODE_MASTER;
  hspi2.Init.Direction = SPI_DIRECTION_2LINES;
  hspi2.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi2.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi2.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi2.Init.NSS = SPI_NSS_SOFT;
  hspi2.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
  hspi2.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi2.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi2.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi2.Init.CRCPolynomial = 10;
  if (HAL_SPI_Init(&hspi2) != HAL_OK)
  {
    Error_Handler();
  }
}

slave_main.c

uint8_t spi_tx_data[9];
uint8_t spi_rx_data[9];

uint8_t rx_cmplt = 0;

void HAL_SPI_RxCpltCallback (SPI_HandleTypeDef *hspi) {
    static uint8_t rx_counter = 0;

    if ( rx_counter == 8 ){
        rx_cmplt = 1;
    } else {
        rx_counter++;
    }
    HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
}

int main(void)
{
  MX_SPI2_Init();

  spi_tx_data[0] = 0;
  spi_tx_data[1] = 0;
  spi_tx_data[2] = 0;
  spi_tx_data[3] = 0;
  spi_tx_data[4] = 0;
  spi_tx_data[5] = 0;
  spi_tx_data[6] = 0;
  spi_tx_data[7] = 0;
  spi_tx_data[8] = 2;

  while (1)
  {
      static HAL_StatusTypeDef spi_error = HAL_OK;

      static uint32_t PreviousTicks_GreenLight = 0U;
      uint32_t CurrentTicks_GreenLight = HAL_GetTick();
      if((CurrentTicks_GreenLight - PreviousTicks_GreenLight) >= 1000u)
      {
          HAL_GPIO_TogglePin(LD1_GPIO_Port, LD1_Pin);
          PreviousTicks_GreenLight = CurrentTicks_GreenLight;
      }

      static uint8_t runonce = 0;
      if (HAL_GPIO_ReadPin(GPIO_ADR1_GPIO_Port, GPIO_ADR1_Pin) != 1) {
          if (runonce != 1){

              HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
              //spi_error = HAL_SPI_TransmitReceive_IT(&hspi2, spi_tx_data, spi_rx_data, 18);
              spi_error = HAL_SPI_TransmitReceive(&hspi2,spi_tx_data, spi_rx_data,18,0x01);
              HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);

              runonce = 1;
          }
      } else {
          runonce = 0;
      }

      static uint32_t PreviousTicks_RedLight = 0U;
      uint32_t CurrentTicks_RedLight = HAL_GetTick();
      if((CurrentTicks_RedLight - PreviousTicks_RedLight) >= 500u)
      {
          if ( rx_cmplt == 1 ){
              if (spi_rx_data[8] == 1){
                  HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, 1);
              } else {
                  HAL_GPIO_WritePin(LD3_GPIO_Port, LD3_Pin, 1);
              }
          } else {
              if ( spi_error == HAL_TIMEOUT || spi_error == HAL_ERROR){
                  HAL_GPIO_TogglePin(LD3_GPIO_Port, LD3_Pin);
                  if (spi_error == HAL_TIMEOUT){
                      HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
                  }
              }
          }

          PreviousTicks_RedLight = CurrentTicks_RedLight;
      }
  }
}

static void MX_SPI2_Init(void)
{
  hspi2.Instance = SPI2;
  hspi2.Init.Mode = SPI_MODE_SLAVE;
  hspi2.Init.Direction = SPI_DIRECTION_2LINES;
  hspi2.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi2.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi2.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi2.Init.NSS = SPI_NSS_SOFT;
  hspi2.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi2.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi2.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi2.Init.CRCPolynomial = 10;
  if (HAL_SPI_Init(&hspi2) != HAL_OK)
  {
    Error_Handler();
  }
}

为了简单起见，我去掉了各种 MCU 初始化。我之前曾尝试使用 IT 版本的 TransmitRecieve，但没有成功传输。如果我多次使用主设备上的 USER 按钮，它确实会激活从设备上的相应灯，但不会在主设备上激活。

标签： cspinucleomcu

解决方案

我怀疑我有某种接线问题。我在混合物中添加了一个面包板并插入了一些 LED，不知何故，在将所有东西连接起来后，主从都正常工作。我确实更改了代码以使用 SPI 的一些 STM 示例，但那是在面包板之前。

从站.c

  static uint8_t runonce = 0;
  if (HAL_GPIO_ReadPin(GPIO_ADR1_GPIO_Port, GPIO_ADR1_Pin) != 1) {
      if (runonce != 1){


      switch(HAL_SPI_TransmitReceive(&hspi2, spi_tx_data, spi_rx_data, 9, 5000))
        {
        case HAL_OK:
          /* Communication is completed_____________________________________________*/
          /* Compare the sent and received buffers */
          if(spi_rx_data[8] == 1)
          {
              HAL_GPIO_TogglePin(LD1_GPIO_Port, LD1_Pin);
          }

          break;

        case HAL_TIMEOUT:
          /* A Timeout occurred_____________________________________________________*/
          /* Call Timeout Handler */
            HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);
          break;

          /* An Error occurred______________________________________________________*/
        case HAL_ERROR:
          /* Call Timeout Handler */
            HAL_GPIO_TogglePin(LD3_GPIO_Port, LD3_Pin);
          break;

        default:
          break;
        }

      runonce = 1;
  }
  } else {
      runonce = 0;
  }

大师.c

  static uint8_t runonce = 0;
  if (HAL_GPIO_ReadPin(USER_Btn_GPIO_Port, USER_Btn_Pin) != 0) {
      if (runonce != 1){


          HAL_GPIO_WritePin(GPIO_ADR1_GPIO_Port, GPIO_ADR1_Pin, 0);
          HAL_Delay(0x01);

          switch(HAL_SPI_TransmitReceive(&hspi2, spi_tx_data, spi_rx_data, 9, 5000))
            {
            case HAL_OK:
              /* Communication is completed_____________________________________________*/
              /* Compare the sent and received buffers */
              if(spi_rx_data[8] == 2)
              {
                  HAL_GPIO_WritePin(LD1_GPIO_Port, LD1_Pin, 1);
              }

              break;

            case HAL_TIMEOUT:
              /* A Timeout occurred_____________________________________________________*/
              /* Call Timeout Handler */
                HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, 1);
              break;

              /* An Error occurred______________________________________________________*/
            case HAL_ERROR:
              /* Call Timeout Handler */
                HAL_GPIO_WritePin(LD3_GPIO_Port, LD3_Pin, 1);
              break;

            default:
              break;
            }

          //HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);

          HAL_GPIO_WritePin(GPIO_ADR1_GPIO_Port, GPIO_ADR1_Pin, 1);

          runonce = 1;
      }
  } else {
      runonce = 0;
  }

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