关于I2C的指针问题

只看该作者 · 2020-4-3 21:12

uint32_t I2C_EE_PageWrite(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite)
{
  I2CTimeout = I2CT_LONG_TIMEOUT;

  while(I2C_GetFlagStatus(EEPROM_I2Cx, I2C_FLAG_BUSY))
  {
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(4);
  }

  /* Send START condition */
  I2C_GenerateSTART(EEPROM_I2Cx, ENABLE);

  I2CTimeout = I2CT_FLAG_TIMEOUT;
  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_MODE_SELECT))
  {
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(5);
  }

  /* Send EEPROM address for write */
  I2C_Send7bitAddress(EEPROM_I2Cx, EEPROM_ADDRESS, I2C_Direction_Transmitter);

  I2CTimeout = I2CT_FLAG_TIMEOUT;
  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
  {
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(6);
  }

  /* Send the EEPROM's internal address to write to */
  I2C_SendData(EEPROM_I2Cx, WriteAddr);

  I2CTimeout = I2CT_FLAG_TIMEOUT;
  /* Test on EV8 and clear it */
  while(! I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
  {
if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(7);
  }

  /* While there is data to be written */
  while(NumByteToWrite--)
  {
/* Send the current byte */
I2C_SendData(EEPROM_I2Cx, *pBuffer);

/* Point to the next byte to be written */
pBuffer++;

I2CTimeout = I2CT_FLAG_TIMEOUT;

/* Test on EV8 and clear it */
while (!I2C_CheckEvent(EEPROM_I2Cx, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
{
   if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(8);
}
  }

  /* Send STOP condition */
  I2C_GenerateSTOP(EEPROM_I2Cx, ENABLE);

  return 1;
}

oid I2C_EE_BufferWrite(u8* pBuffer, u8 WriteAddr, u16 NumByteToWrite)
{
  u8 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0;

  Addr = WriteAddr % I2C_PageSize;
  count = I2C_PageSize - Addr;
  NumOfPage =  NumByteToWrite / I2C_PageSize;
  NumOfSingle = NumByteToWrite % I2C_PageSize;

  /* If WriteAddr is I2C_PageSize aligned  */
  if(Addr == 0)
  {
/* If NumByteToWrite < I2C_PageSize */
if(NumOfPage == 0)
{
   I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
   I2C_EE_WaitEepromStandbyState();
}
/* If NumByteToWrite > I2C_PageSize */
else
{
   while(NumOfPage--)
   {
      I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);
         I2C_EE_WaitEepromStandbyState();
      WriteAddr +=  I2C_PageSize;
      pBuffer += I2C_PageSize;
   }

   if(NumOfSingle!=0)
   {
      I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
      I2C_EE_WaitEepromStandbyState();
   }
}
  }
  /* If WriteAddr is not I2C_PageSize aligned  */
  else
  {
/* If NumByteToWrite < I2C_PageSize */
if(NumOfPage== 0)
{
   I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
   I2C_EE_WaitEepromStandbyState();
}
/* If NumByteToWrite > I2C_PageSize */
else
{
   NumByteToWrite -= count;
   NumOfPage =  NumByteToWrite / I2C_PageSize;
   NumOfSingle = NumByteToWrite % I2C_PageSize;

   if(count != 0)
   {
      I2C_EE_PageWrite(pBuffer, WriteAddr, count);
      I2C_EE_WaitEepromStandbyState();
      WriteAddr += count;
      pBuffer += count;
   }

   while(NumOfPage--)
   {
      I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);
      I2C_EE_WaitEepromStandbyState();
      WriteAddr +=  I2C_PageSize;
      pBuffer += I2C_PageSize;
   }
   if(NumOfSingle != 0)
   {
      I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);
      I2C_EE_WaitEepromStandbyState();
   }
}
  }
}

火哥为什么pBuffer指针在I2C_EE_PageWrite函数中自加了 I2C_SendData(EEPROM_I2Cx, *pBuffer);

/* Point to the next byte to be written */
pBuffer++; 但是在I2C_EE_BufferWrite当中又加上页面大小呢？ while(NumOfPage--)    {
      I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);
         I2C_EE_WaitEepromStandbyState();
      WriteAddr +=  I2C_PageSize;
      pBuffer += I2C_PageSize;他自加的时候指针不是已经跳转了8次吗？再加不就多了吗？另外那个WriteAddr地址变量不是写一个数据就直接跳到下一个地址吗？为什么还是要加页面大小？他在页写的时候都没有地址变量自加，说明他是自己跳转啊，为什么还要加页面大小呢？请指教

2万 · 2020-4-7 09:55

帮顶一下，希望问题得到解决

关于I2C的指针问题

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