stm32f3的i2c使用小结

<span style="font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;">这几天拿到了stm32f3discovery，拿到手的第一件事就是测试了硬件i2c，使用stm32cube生成库，测试对象为AD5934与ADG715。经过两天的调试，完美调通。中间也碰到了些问题。</span><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;">1、一开始用的I2C1，一仿真就会出现死机的情况。</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;"><span apple-tab-span="" style="word-wrap: break-word; word-break: break-all;">        </span>由于I2C1与swd接口重合，所以调用HAL_I2C_Init()函数后就死机，改成I2C2后问题解决。</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;">2、无法访问指定地址的设备</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;"><span apple-tab-span="" style="word-wrap: break-word; word-break: break-all;">        </span>库函数中的入口地址并不是7bit地址，需要输入8bit。我的设备地址为13，始终无法访问设备，改为26后解决。</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;">3、可以读写单个地址的数据，但是不能多字节读写。</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;"><span apple-tab-span="" style="word-wrap: break-word; word-break: break-all;">       (1)、对于多字节写， </span>库函数中的</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;">        HAL_StatusTypeDef HAL_I2C_Mem_Write(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint16_t MemAddress, uint16_t MemAddSize, uint8_t *pData, uint16_t Size, uint32_t Timeout)</div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;"><span line-height:="" 1="" 8em="" style="word-wrap: break-word; word-break: break-all;">       其中</span><span line-height:="" 25="" 2000007629395px="" style="word-wrap: break-word; word-break: break-all;">MemAddSize表示地址的位数，0表示7bit地址，1表示10bit地址。我误认为这个写的字节数，所以导致在写多字节的时候出错。</span></div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;"><span line-height:="" 25="" 2000007629395px="" style="word-wrap: break-word; word-break: break-all;">       (2)、对于多字节读，由于AD5934的读操作与库函数的读操作有些出入，所以导致一直读错误。在库函数中写完读的内存地址就开始读，而AD5934中写完block read后接着还要再写一个number bytes read然后才开始读。所以需要对库函数进行修改，新增一个函数，以适合AD5934的block read.</span></div><div style="word-wrap: break-word; word-break: break-all; font-family: Tahoma, 'Microsoft Yahei', Simsun; font-size: 14px; line-height: 25.2000007629395px;"><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;"><a target=_blank href="http://bbs.21ic.com/data/attachment/album/201504/26/203136h658z8f7k7f072k6.png" target="_blank" style="word-wrap: break-word; word-break: break-all; color: rgb(0, 102, 153); text-decoration: none;"><img src="http://bbs.21ic.com/data/attachment/album/201504/26/203136h658z8f7k7f072k6.png" style="word-wrap: break-word; word-break: break-all; border: none; max-width: 620px;" alt="" /></a></p><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;"><span line-height:="" 1="" 8em="" style="word-wrap: break-word; word-break: break-all;"><span apple-tab-span="" style="word-wrap: break-word; word-break: break-all;">        </span>stm32f3的i2c有三种模式：Reload、AutoEnd、SoftEnd模式。</span></p><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;"><span line-height:="" 1="" 8em="" style="word-wrap: break-word; word-break: break-all;">        i2c每发送完一个字节，就会产生TXIS标志，当发送完最后一个字节时：</span></p><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;"><span apple-tab-span="" style="word-wrap: break-word; word-break: break-all;">        </span>对于Reload模式，当字节大于255字节时，必须使用此模式，此模式下发送结束后，会产生tcr标志。</p><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;">        对于AutoEnd模式，发送后最后一个字节时，会自动产生STOP。</p><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;">        对于<span line-height:="" 25="" 2000007629395px="" style="word-wrap: break-word; word-break: break-all;">SoftEnd模式，发送完最后一个字节时，会产生</span>tc标志，对于发送过程中需要Restart的需要使用此模式。</p><p style="word-wrap: break-word; word-break: break-all; margin-top: 0px; margin-bottom: 0px; padding-top: 0px; padding-bottom: 0px;">        对于AD5934的读操作，可以事先工作在SoftEnd模式，发送完<span line-height:="" 25="" 2000007629395px="" style="word-wrap: break-word; word-break: break-all;">block read与number bytes read字节后，再转入AutoEnd模式进行Restart，读取完指定的字节后自动产生STOP。操作流程如下：</span></p></div>

HAL_StatusTypeDef HAL_I2C_Mem_Read_AD5934_Block(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint16_t MemAddress, uint16_t MemAddSize, uint8_t *pData, uint16_t Size, uint32_t Timeout){  uint32_t Sizetmp = 0;  /* Check the parameters */  assert_param(IS_I2C_MEMADD_SIZE(MemAddSize));    if(hi2c->State == HAL_I2C_STATE_READY)  {        if((pData == NULL) || (Size == 0))     {      return  HAL_ERROR;                                        }    if(__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_BUSY) == SET)    {      return HAL_BUSY;    }    /* Process Locked */    __HAL_LOCK(hi2c);        hi2c->State = HAL_I2C_STATE_MEM_BUSY_RX;    hi2c->ErrorCode = HAL_I2C_ERROR_NONE;    /*    //Send Slave Address and Memory Address     if(I2C_RequestMemoryRead(hi2c, DevAddress, MemAddress, MemAddSize, Timeout) != HAL_OK)    {      if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)      {        // Process Unlocked         __HAL_UNLOCK(hi2c);        return HAL_ERROR;      }      else      {        // Process Unlocked         __HAL_UNLOCK(hi2c);        return HAL_TIMEOUT;      }    }*/        I2C_TransferConfig(hi2c,DevAddress,MemAddSize+1, I2C_SOFTEND_MODE, I2C_GENERATE_START_WRITE);          /* Wait until TXIS flag is set */    if(I2C_WaitOnTXISFlagUntilTimeout(hi2c, Timeout) != HAL_OK)    {      if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)      {        return HAL_ERROR;      }      else      {        return HAL_TIMEOUT;      }    }        /* If Memory address size is 8Bit */    if(MemAddSize == I2C_MEMADD_SIZE_8BIT)    {      /* Send Memory Address */      hi2c->Instance->TXDR = __HAL_I2C_MEM_ADD_LSB(MemAddress);        }          /* If Mememory address size is 16Bit */    else    {      /* Send MSB of Memory Address */      hi2c->Instance->TXDR = __HAL_I2C_MEM_ADD_MSB(MemAddress);             /* Wait until TXIS flag is set */      if(I2C_WaitOnTXISFlagUntilTimeout(hi2c, Timeout) != HAL_OK)      {        if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)        {          return HAL_ERROR;        }        else        {          return HAL_TIMEOUT;        }      }            /* Send LSB of Memory Address */      hi2c->Instance->TXDR = __HAL_I2C_MEM_ADD_LSB(MemAddress);      }       /* Wait until TXIS flag is set */    if(I2C_WaitOnTXISFlagUntilTimeout(hi2c, Timeout) != HAL_OK)    {      if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)      {        return HAL_ERROR;      }      else      {        return HAL_TIMEOUT;      }    }        hi2c->Instance->TXDR = Size;         /* Wait until TC flag is set */    if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_TC, RESET, Timeout) != HAL_OK)          {      return HAL_TIMEOUT;    }            /* Send Slave Address */    /* Set NBYTES to write and reload if size > 255 and generate RESTART */    /* Size > 255, need to set RELOAD bit */    if(Size > 255)    {      I2C_TransferConfig(hi2c,DevAddress,255, I2C_RELOAD_MODE, I2C_GENERATE_START_READ);      Sizetmp = 255;    }    else    {      I2C_TransferConfig(hi2c,DevAddress,Size, I2C_AUTOEND_MODE, I2C_GENERATE_START_READ);      Sizetmp = Size;    }        do    {        /* Wait until RXNE flag is set */      if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_RXNE, RESET, Timeout) != HAL_OK)            {        return HAL_TIMEOUT;      }                /* Read data from RXDR */      (*pData++) = hi2c->Instance->RXDR;      /* Decrement the Size counter */      Sizetmp--;      Size--;         if((Sizetmp == 0)&&(Size!=0))      {        /* Wait until TCR flag is set */        if(I2C_WaitOnFlagUntilTimeout(hi2c, I2C_FLAG_TCR, RESET, Timeout) != HAL_OK)              {          return HAL_TIMEOUT;        }                if(Size > 255)        {          I2C_TransferConfig(hi2c,DevAddress,255, I2C_RELOAD_MODE, I2C_NO_STARTSTOP);          Sizetmp = 255;        }        else        {          I2C_TransferConfig(hi2c,DevAddress,Size, I2C_AUTOEND_MODE, I2C_NO_STARTSTOP);          Sizetmp = Size;        }      }    }while(Size > 0);    /* No need to Check TC flag, with AUTOEND mode the stop is automatically generated */    /* Wait until STOPF flag is reset */     if(I2C_WaitOnSTOPFlagUntilTimeout(hi2c, I2C_TIMEOUT_STOPF) != HAL_OK)    {      if(hi2c->ErrorCode == HAL_I2C_ERROR_AF)      {        return HAL_ERROR;      }      else      {        return HAL_TIMEOUT;      }    }    /* Clear STOP Flag */    __HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_STOPF);      /* Clear Configuration Register 2 */    __HAL_I2C_RESET_CR2(hi2c);        hi2c->State = HAL_I2C_STATE_READY;        /* Process Unlocked */    __HAL_UNLOCK(hi2c);        return HAL_OK;  }  else  {    return HAL_BUSY;  }}