stm32f030的i2c（eeprom）调试分享

alisa123 提问时间：2016-1-13 16:43 /

之前在调试stm32的i2c花了很长时间，由于项目时间催的紧，硬件的i2c没能调试好，最后项目中采用了软件模拟的方式，由于软件等待时间CPU的效率有点低，后面自己花时间最终调通了硬件i2c，调试中自己的两点注意：1，调试i2c外接的器件接好一定要核对Ok(否则，后续努力也没用)；2,要弄清i2c通信原理，多参考前人的经验。现在分享代码如下：
void sReadI2C(INT8U* lubData,INT16U luwI2CAddr,INT8U lubDataLen) //从指定地址读取指定长度的数据
{
INT8U i;

// 等待总线空闲
while(I2C_GetFlagStatus(I2C1,I2C_FLAG_BUSY));
I2C_TransferHandling(I2C1,EepromAddr,1,I2C_SoftEnd_Mode,I2C_Generate_Start_Write);
while(I2C_GetFlagStatus(I2C1,I2C_FLAG_TXIS) == RESET);
I2C_SendData(I2C1,luwI2CAddr);
while(I2C_GetFlagStatus(I2C1,I2C_FLAG_TC) == RESET);
I2C_TransferHandling(I2C1,EepromAddr,lubDataLen,I2C_AutoEnd_Mode,I2C_Generate_Start_Read);
for(i=0;i<lubDataLen;i++)
{
  while(I2C_GetFlagStatus(I2C1,I2C_FLAG_RXNE) == RESET);
  lubData[i] = I2C_ReceiveData(I2C1);
}
while(I2C_GetFlagStatus(I2C1,I2C_FLAG_STOPF) == RESET);
I2C_ClearFlag(I2C1, I2C_ICR_STOPCF);
}

//从指定地址开始写指定个数的数据
void I2C_uWriteData(INT8U *WriteBuf,INT16U WriteAddr,INT8U WriteLen)
{
INT8U i;

// 等待总线空闲
while(I2C_GetFlagStatus(I2C1,I2C_FLAG_BUSY));
I2C_TransferHandling(I2C1,EepromAddr,1,I2C_Reload_Mode,I2C_Generate_Start_Write);
while(I2C_GetFlagStatus(I2C1,I2C_FLAG_TXIS) == RESET);
I2C_SendData(I2C1,WriteAddr);
while(I2C_GetFlagStatus(I2C1,I2C_FLAG_TCR) == RESET);
I2C_TransferHandling(I2C1,EepromAddr,WriteLen,I2C_AutoEnd_Mode,I2C_No_StartStop);
for(i=0;i<WriteLen;i++)
{
  while(I2C_GetFlagStatus(I2C1,I2C_FLAG_TXIS) == RESET);
  I2C_SendData(I2C1, WriteBuf[i]);
}
while(I2C_GetFlagStatus(I2C1,I2C_FLAG_STOPF) == RESET);
I2C_ClearFlag(I2C1, I2C_ICR_STOPCF);
}

//eeprom不能跨页连续写数据，对跨页写的数据进行处理
void sWriteI2C(INT8U* lubData,INT16U luwI2CAddr,INT8U lubDataLen)
{
INT16U NumOfPage = 0,NumOfSingle = 0,Addr = 0;
INT16U count = 0;

Addr = luwI2CAddr % 16;
count = 16 - Addr;
NumOfPage = lubDataLen / 16;
NumOfSingle = lubDataLen % 16;

while(I2C_GetFlagStatus(I2C1,I2C_FLAG_BUSY));
if(Addr == 0)
{
  if(NumOfPage == 0)
  {
I2C_uWriteData(lubData,luwI2CAddr,NumOfSingle);
I2c_delayms(5);
  }
  else
  {
while(NumOfPage--)
{
I2C_uWriteData(lubData,luwI2CAddr,16);
I2c_delayms(5);
luwI2CAddr +=  16;
lubData += 16;
}
if(NumOfSingle!=0)
{
I2C_uWriteData(lubData,luwI2CAddr,NumOfSingle);
I2c_delayms(5);
}
  }
}
else
{
  if(NumOfPage== 0)
  {
if (lubDataLen > count)
{
/* Write the data contained in same page */
I2C_uWriteData(lubData,luwI2CAddr,count);
I2c_delayms(5);
   /* Write the remaining data in the following page */
I2C_uWriteData((INT8U*)(lubData + count),luwI2CAddr + count,lubDataLen - count);
I2c_delayms(5);
}
else
{
I2C_uWriteData(lubData,luwI2CAddr,NumOfSingle);
I2c_delayms(5);
}
  }
  else
  {
lubDataLen -= count;
NumOfPage =  lubDataLen / 16;
NumOfSingle = lubDataLen % 16;
if(count != 0)
{
I2C_uWriteData(lubData,luwI2CAddr,count);
I2c_delayms(5);
luwI2CAddr += count;
lubData += count;
}
while(NumOfPage--)
{
I2C_uWriteData(lubData,luwI2CAddr,16);
I2c_delayms(5);
luwI2CAddr +=  16;
lubData += 16;
}
if(NumOfSingle != 0)
{
I2C_uWriteData(lubData,luwI2CAddr,NumOfSingle);
I2c_delayms(5);
}
  }
}
}