STM32CUBEMX的低层功能以中断模式在两个stm32板之间进行I2C通信

问题描述

我正在一个需要两个stm32 (stm32f103rb and stm32f429zg)之间进行数据通信的项目。

我使用stm32f103rb-nucleo examples_ll (I2C _OneBoard_Communication_IT)，但它只工作一个字节，此后便停止工作。我希望它可以重复工作。

代码结构与在与stm32cubemx存储库相关的文件夹中编写示例的方式完全相同。

我不知道如何使它循环工作，而每次按下主按钮和从按钮时，通过按下按钮，通信就完成了。

我在这里放置了主完成回调函数：

void Master_Complete_Callback(void)
{
  if(ubNbDataToReceive == 3)
  {
    /* Prepare the generation of a Non ACKNowledge condition after next received bytes */
    LL_I2C_AckNowledgeNextData(I2C1,LL_I2C_NACK);
    
    /* Read character in Receive Data register.
    RXNE flag is cleared by reading data in RXDR register */
    aReceiveBuffer[ubReceiveIndex++] = LL_I2C_ReceiveData8(I2C1);
    ubNbDataToReceive--;

    /* disable Buffer Interrupts */
    LL_I2C_disableIT_BUF(I2C1);
  }
  else if(ubNbDataToReceive == 2)
  {
    /* Generate Stop condition */
    LL_I2C_GenerateStopCondition(I2C1);

    /* Read character from Receive Data register.
    RXNE flag is cleared by reading data in RXDR register */
    aReceiveBuffer[ubReceiveIndex++] = LL_I2C_ReceiveData8(I2C1);
    ubNbDataToReceive--;

    /* Read character from shift register.
    RXNE flag is cleared by reading data in RXDR register */
    aReceiveBuffer[ubReceiveIndex++] = LL_I2C_ReceiveData8(I2C1);
    ubNbDataToReceive--;
  }
  else
  {
    if(ubNbDataToReceive > 0)
    {
      /* Read character from shift register.
      RXNE flag is cleared by reading data in RXDR register */
      aReceiveBuffer[ubReceiveIndex++] = LL_I2C_ReceiveData8(I2C2);
      
      /* Update ubNbDataToReceive variable */
      ubNbDataToReceive--;
    }
  }

  if(ubNbDataToReceive == 0)
  {
    /* (1) disable I2C1 transfer event/error interrupts:
     *  - disable Events Interrupt
     *  - disable Error interrupts
     */
    LL_I2C_disableIT_EVT(I2C1);
    LL_I2C_disableIT_ERR(I2C1);

        LL_I2C_EnableIT_EVT(I2C1);
    LL_I2C_EnableIT_ERR(I2C1);
    /* Read Received character.
    RXNE flag is cleared by reading of RXDR register */
    if(aReceiveBuffer[ubReceiveIndex-1] == SLAVE_BYTE_TO_SEND)
    {
      /* Turn LED2 On:
       * - Expected byte has been received
       * - Master Rx sequence completed successfully
       */
            
      //LED_On();
            HAL_UART_Transmit_IT(&huart2,(uint8_t*)"#Data transfer is OK!$",strlen("#Data transfer is OK!$"));
            ubNbDataToTransmit     = sizeof(SLAVE_BYTE_TO_SEND);
            ubNbDataToReceive      = sizeof(SLAVE_BYTE_TO_SEND);
    }
    else
    {
      /* Call Error function */
      Error_Callback();
    }
  }
}

很容易理解，传输过程的结束是当我添加HAL_UART函数以将传输完成发送到串行端口时。

，但是在这段时间之后，它又工作了一次，然后停止了。 我检查了示波器的信号显示，并在第二次传输SCL引脚变为LOW后。 谢谢

解决方法

很长一段时间没有使用LL，但是使用LL_I2C_DisableIT_EVT(I2C1);进行单次传输后是否未禁用I2C中断？确保在下次传输之前再次启用它。

,

存在两个主设备无法通过I2C总线相互通信的情况。因为主设备没有 DEVICE_ADDRESS。主设备只能与从设备通信。