stm32_eval_i2c_ee.c

STM32的SPI1与SPI2通信

#ifdef sEE_M24C08
  
  /*!< Send the EEPROM's internal address to write to : only one byte Address */
  I2C_SendData(sEE_I2C, WriteAddr);
  
#elif defined(sEE_M24C64_32)
  
  /*!< Send the EEPROM's internal address to write to : MSB of the address first */
  I2C_SendData(sEE_I2C, (uint8_t)((WriteAddr & 0xFF00) >> 8));

  /*!< Test on EV8 and clear it */
  sEETimeout = sEE_FLAG_TIMEOUT;  
  while(!I2C_CheckEvent(sEE_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
  {
    if((sEETimeout--) == 0) return sEE_TIMEOUT_UserCallback();
  }  
  
  /*!< Send the EEPROM's internal address to write to : LSB of the address */
  I2C_SendData(sEE_I2C, (uint8_t)(WriteAddr & 0x00FF));
  
#endif /*!< sEE_M24C08 */  
  
  /*!< Test on EV8 and clear it */
  sEETimeout = sEE_FLAG_TIMEOUT; 
  while(!I2C_CheckEvent(sEE_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
  {
    if((sEETimeout--) == 0) return sEE_TIMEOUT_UserCallback();
  }  
  
  /* Configure the DMA Tx Channel with the buffer address and the buffer size */
  sEE_LowLevel_DMAConfig((uint32_t)pBuffer, (uint8_t)(*NumByteToWrite), sEE_DIRECTION_TX);
    
  /* Enable the DMA Tx Channel */
  DMA_Cmd(sEE_I2C_DMA_CHANNEL_TX, ENABLE);
  
  /* If all operations OK, return sEE_OK (0) */
  return sEE_OK;
}

/**
  * @brief  Writes buffer of data to the I2C EEPROM.
  * @param  pBuffer : pointer to the buffer  containing the data to be written 
  *         to the EEPROM.
  * @param  WriteAddr : EEPROM's internal address to write to.
  * @param  NumByteToWrite : number of bytes to write to the EEPROM.
  * @retval None
  */
void sEE_WriteBuffer(uint8_t* pBuffer, uint16_t WriteAddr, uint16_t NumByteToWrite)
{
  uint8_t NumOfPage = 0, NumOfSingle = 0, count = 0;
  uint16_t Addr = 0;

  Addr = WriteAddr % sEE_PAGESIZE;
  count = sEE_PAGESIZE - Addr;
  NumOfPage =  NumByteToWrite / sEE_PAGESIZE;
  NumOfSingle = NumByteToWrite % sEE_PAGESIZE;
 
  /*!< If WriteAddr is sEE_PAGESIZE aligned  */
  if(Addr == 0) 
  {
    /*!< If NumByteToWrite < sEE_PAGESIZE */
    if(NumOfPage == 0) 
    {
      /* Store the number of data to be written */
      sEEDataNum = NumOfSingle;
      /* Start writing data */
      sEE_WritePage(pBuffer, WriteAddr, (uint8_t*)(&sEEDataNum));
      /* Wait transfer through DMA to be complete */
      sEETimeout = sEE_LONG_TIMEOUT;
      while (sEEDataNum > 0)
      {
        if((sEETimeout--) == 0) {sEE_TIMEOUT_UserCallback(); return;};
      }
      sEE_WaitEepromStandbyState();
    }
    /*!< If NumByteToWrite > sEE_PAGESIZE */
    else  
    {
      while(NumOfPage--)
      {
        /* Store the number of data to be written */
        sEEDataNum = sEE_PAGESIZE;        
        sEE_WritePage(pBuffer, WriteAddr, (uint8_t*)(&sEEDataNum)); 
        /* Wait transfer through DMA to be complete */
        sEETimeout = sEE_LONG_TIMEOUT;
        while (sEEDataNum > 0)
        {
          if((sEETimeout--) == 0) {sEE_TIMEOUT_UserCallback(); return;};
        }      
        sEE_WaitEepromStandbyState();
        WriteAddr +=  sEE_PAGESIZE;
        pBuffer += sEE_PAGESIZE;
      }

      if(NumOfSingle!=0)
      {
        /* Store the number of data to be written */
        sEEDataNum = NumOfSingle;          
        sEE_WritePage(pBuffer, WriteAddr, (uint8_t*)(&sEEDataNum));
        /* Wait transfer through DMA to be complete */
        sEETimeout = sEE_LONG_TIMEOUT;
        while (sEEDataNum > 0)
        {
          if((sEETimeout--) == 0) {sEE_TIMEOUT_UserCallback(); return;};
        }    
        sEE_WaitEepromStandbyState();
      }
    }
  }
  /*!< If WriteAddr is not sEE_PAGESIZE aligned  */
  else 
  {
    /*!< If NumByteToWrite < sEE_PAGESIZE */
    if(NumOfPage== 0) 
    {
      /*!< If the number of data to be written is more than the remaining space 
      in the current page: */
      if (NumByteToWrite > count)
      {
        /* Store the number of data to be written */
        sEEDataNum = count;        
        /*!< Write the data conained in same page */
        sEE_WritePage(pBuffer, WriteAddr, (uint8_t*)(&sEEDataNum));
        /* Wait transfer through DMA to be complete */
        sEETimeout = sEE_LONG_TIMEOUT;
        while (sEEDataNum > 0)
        {
          if((sEETimeout--) == 0) {sEE_TIMEOUT_UserCallback(); return;};
        }          
        sEE_WaitEepromStandbyState();      
        
        /* Store the number of data to be written */
        sEEDataNum = (NumByteToWrite - count);          
        /*!< Write the remaining data in the following page */
        sEE_WritePage((uint8_t*)(pBuffer + count), (WriteAddr + count), (uint8_t*)(&sEEDataNum));
        /* Wait transfer through DMA to be complete */
        sEETimeout = sEE_LONG_TIMEOUT;
        while (sEEDataNum > 0)
        {
          if((sEETimeout--) == 0) {sEE_TIMEOUT_UserCallback(); return;};
        }     
        sEE_WaitEepromStandbyState();        
      }      
      else      
      {
        /* Store the number of data to be written */
        sEEDataNum = NumOfSingle;         
        sEE_WritePage(pBuffer, WriteAddr, (uint8_t*)(&sEEDataNum));
        /* Wait transfer through DMA to be complete */
        sEETimeout = sEE_LONG_TIMEOUT;
        while (sEEDataNum > 0)
        {
          if((sEETimeout--) == 0) {sEE_TIMEOUT_UserCallback(); return;};
        }          
        sEE_WaitEepromStandbyState();        
      }     
    }
    /*!< If NumByteToWrite > sEE_PAGESIZE */
    else
    {
      NumByteToWrite -= count;
      NumOfPage =  NumByteToWrite / sEE_PAGESIZE;
      NumOfSingle = NumByteToWrite % sEE_PAGESIZE;
      
      if(count != 0)
      {  
        /* Store the number of data to be written */
        sEEDataNum = count;         
        sEE_WritePage(pBuffer, WriteAddr, (uint8_t*)(&sEEDataNum));
        /* Wait transfer through DMA to be complete */
        sEETimeout = sEE_LONG_TIMEOUT;
        while (sEEDataNum > 0)
        {
          if((sEETimeout--) == 0) {sEE_TIMEOUT_UserCallback(); return;};
        }     
        sEE_WaitEepromStandbyState();
        WriteAddr += count;
        pBuffer += count;
      } 
      
      while(NumOfPage--)
      {
        /* Store the number of data to be written */
        sEEDataNum = sEE_PAGESIZE;          
        sEE_WritePage(pBuffer, WriteAddr, (uint8_t*)(&sEEDataNum));
        /* Wait transfer through DMA to be complete */
        sEETimeout = sEE_LONG_TIMEOUT;
        while (sEEDataNum > 0)
        {
          if((sEETimeout--) == 0) {sEE_TIMEOUT_UserCallback(); return;};
        }        
        sEE_WaitEepromStandbyState();
        WriteAddr +=  sEE_PAGESIZE;
        pBuffer += sEE_PAGESIZE;  
      }
      if(NumOfSingle != 0)
      {
        /* Store the number of data to be written */
        sEEDataNum = NumOfSingle;           
        sEE_WritePage(pBuffer, WriteAddr, (uint8_t*)(&sEEDataNum)); 
        /* Wait transfer through DMA to be complete */
        sEETimeout = sEE_LONG_TIMEOUT;
        while (sEEDataNum > 0)
        {
          if((sEETimeout--) == 0) {sEE_TIMEOUT_UserCallback(); return;};
        }         
        sEE_WaitEepromStandbyState();
      }
    }
  }  
}

/**
  * @brief  Wait for EEPROM Standby state.
  * 
  * @note  This function allows to wait and check that EEPROM has finished the 
  *        last Write operation. It is mostly used after Write operation: after 
  *        receiving the buffer to be written, the EEPROM may need additional 
  *        time to actually perform the write operation. During this time, it 
  *        doesn't answer to I2C packets addressed to it. Once the write operation 
  *        is complete the EEPROM responds to its address.
  *        
  * @note  It is not necessary to call this function after sEE_WriteBuffer() 
  *        function (sEE_WriteBuffer() already calls this function after each
  *        write page operation).    
  * 
  * @param  None
  * @retval sEE_OK (0) if operation is correctly performed, else return value 
  *         different from sEE_OK (0) or the timeout user callback.
  */
uint32_t sEE_WaitEepromStandbyState(void)      
{
  __IO uint16_t tmpSR1 = 0;
  __IO uint32_t sEETrials = 0;

  /*!< While the bus is busy */
  sEETimeout = sEE_LONG_TIMEOUT;
  while(I2C_GetFlagStatus(sEE_I2C, I2C_FLAG_BUSY))
  {
    if((sEETimeout--) == 0) return sEE_TIMEOUT_UserCallback();
  }

  /* Keep looping till the slave acknowledge his address or maximum number 
     of trials is reached (this number is defined by sEE_MAX_TRIALS_NUMBER define
     in stm32_eval_i2c_ee.h file) */
  while (1)
  {
    /*!< Send START condition */
    I2C_GenerateSTART(sEE_I2C, ENABLE);

    /*!< Test on EV5 and clear it */
    sEETimeout = sEE_FLAG_TIMEOUT;
    while(!I2C_CheckEvent(sEE_I2C, I2C_EVENT_MASTER_MODE_SELECT))
    {
      if((sEETimeout--) == 0) return sEE_TIMEOUT_UserCallback();
    }    

    /*!< Send EEPROM address for write */
    I2C_Send7bitAddress(sEE_I2C, sEEAddress, I2C_Direction_Transmitter);
    
    /* Wait for ADDR flag to be set (Slave acknowledged his address) */
    sEETimeout = sEE_LONG_TIMEOUT;
    do
    {     
      /* Get the current value of the SR1 register */
      tmpSR1 = sEE_I2C->SR1;
      
      /* Update the timeout value and exit if it reach 0 */
      if((sEETimeout--) == 0) return sEE_TIMEOUT_UserCallback();
    }
    /* Keep looping till the Address is acknowledged or the AF flag is 
       set (address not acknowledged at time) */
    while((tmpSR1 & (I2C_SR1_ADDR | I2C_SR1_AF)) == 0);
     
    /* Check if the ADDR flag has been set */
    if (tmpSR1 & I2C_SR1_ADDR)
    {
      /* Clear ADDR Flag by reading SR1 then SR2 registers (SR1 have already 
         been read) */
      (void)sEE_I2C->SR2;
      
      /*!< STOP condition */    
      I2C_GenerateSTOP(sEE_I2C, ENABLE);
        
      /* Exit the function */
      return sEE_OK;
    }
    else
    {
      /*!< Clear AF flag */
      I2C_ClearFlag(sEE_I2C, I2C_FLAG_AF);                  
    }
    
    /* Check if the maximum allowed numbe of trials has bee reached */
    if (sEETrials++ == sEE_MAX_TRIALS_NUMBER)
    {
      /* If the maximum number of trials has been reached, exit the function */
      return sEE_TIMEOUT_UserCallback();
    }
  }
}

/**
  * @brief  This function handles the DMA Tx Channel interrupt Handler.
  * @param  None
  * @retval None
  */
void sEE_I2C_DMA_TX_IRQHandler(void)
{
  /* Check if the DMA transfer is complete */ 
  if(DMA_GetFlagStatus(sEE_I2C_DMA_FLAG_TX_TC) != RESET)
  {  
    /* Disable the DMA Tx Channel and Clear all its Flags */  
    DMA_Cmd(sEE_I2C_DMA_CHANNEL_TX, DISABLE);
    DMA_ClearFlag(sEE_I2C_DMA_FLAG_TX_GL);

    /*!< Wait till all data have been physically transferred on the bus */
    sEETimeout = sEE_LONG_TIMEOUT;
    while(!I2C_GetFlagStatus(sEE_I2C, I2C_FLAG_BTF))
    {
      if((sEETimeout--) == 0) sEE_TIMEOUT_UserCallback();
    }
    
    /*!< Send STOP condition */
    I2C_GenerateSTOP(sEE_I2C, ENABLE);
    
    /* Perform a read on SR1 and SR2 register to clear eventualaly pending flags */
    (void)sEE_I2C->SR1;
    (void)sEE_I2C->SR2;
    
    /* Reset the variable holding the number of data to be written */
    *sEEDataWritePointer = 0;  
  }
}

/**
  * @brief  This function handles the DMA Rx Channel interrupt Handler.
  * @param  None
  * @retval None
  */
void sEE_I2C_DMA_RX_IRQHandler(void)
{
  /* Check if the DMA transfer is complete */
  if(DMA_GetFlagStatus(sEE_I2C_DMA_FLAG_RX_TC) != RESET)
  {      
    /*!< Send STOP Condition */
    I2C_GenerateSTOP(sEE_I2C, ENABLE);    
    
    /* Disable the DMA Rx Channel and Clear all its Flags */  
    DMA_Cmd(sEE_I2C_DMA_CHANNEL_RX, DISABLE);
    DMA_ClearFlag(sEE_I2C_DMA_FLAG_RX_GL);
    
    /* Reset the variable holding the number of data to be read */
    *sEEDataReadPointer = 0;
  }
}

#ifdef USE_DEFAULT_TIMEOUT_CALLBACK
/**
  * @brief  Basic management of the timeout situation.
  * @param  None.
  * @retval None.
  */
uint32_t sEE_TIMEOUT_UserCallback(void)
{
  /* Block communication and all processes */
  while (1)
  {   
  }
}
#endif /* USE_DEFAULT_TIMEOUT_CALLBACK */

#ifdef USE_DEFAULT_CRITICAL_CALLBACK
/**
  * @brief  Start critical section: these callbacks should be typically used
  *         to disable interrupts when entering a critical section of I2C communication
  *         You may use default callbacks provided into this driver by uncommenting the 
  *         define USE_DEFAULT_CRITICAL_CALLBACK.
  *         Or you can comment that line and implement these callbacks into your 
  *         application.
  * @param  None.
  * @retval None.
  */
void sEE_EnterCriticalSection_UserCallback(void)
{
  __disable_irq();  
}

/**
  * @brief  Start and End of critical section: these callbacks should be typically used
  *         to re-enable interrupts when exiting a critical section of I2C communication
  *         You may use default callbacks provided into this driver by uncommenting the 
  *         define USE_DEFAULT_CRITICAL_CALLBACK.
  *         Or you can comment that line and implement these callbacks into your 
  *         application.
  * @param  None.
  * @retval None.
  */
void sEE_ExitCriticalSection_UserCallback(void)
{
  __enable_irq();
}
#endif /* USE_DEFAULT_CRITICAL_CALLBACK */

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */  

/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/