移植I2C硬件读错误

fjqzzhangzhibin · 发表于 2015-11-3 19:58:21

移植了一段硬件I2C读数据的代码，发现他读的第一字节是对的，接下来的数据就是错的。哪位大神能帮忙看下，我怀疑是应答信号出问题？
void I2C_EE_BufferRead(uint8_t* pBuffer, uint8_t ReadAddr, uint8_t NumByteToRead)
{
uint8_t buf;
//*((u8 *)0x4001080c) |=0x80;
while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY)); // Added by Najoua 27/08/2008


/* Send START condition */
I2C_GenerateSTART(I2C2, ENABLE);
//*((u8 *)0x4001080c) &=~0x80;

/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C2, EEPROM_ADDRESS, I2C_Direction_Transmitter);

/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

/* Clear EV6 by setting again the PE bit */
I2C_Cmd(I2C2, ENABLE);

/* Send the EEPROM's internal address to write to */
I2C_SendData(I2C2, ReadAddr);

/* Test on EV8 and clear it */
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

/* Send STRAT condition a second time */
I2C_GenerateSTART(I2C2, ENABLE);

/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));

/* Send EEPROM address for read */
I2C_Send7bitAddress(I2C2, EEPROM_ADDRESS, I2C_Direction_Receiver);

/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

/* While there is data to be read */
while(NumByteToRead)
{
if(NumByteToRead == 1)
{
/* Disable Acknowledgement */
I2C_AcknowledgeConfig(I2C2, DISABLE);

/* Send STOP Condition */
I2C_GenerateSTOP(I2C2, ENABLE);
}

/* Test on EV7 and clear it */
if(I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_RECEIVED))
{
/* Read a byte from the EEPROM */
*pBuffer = I2C_ReceiveData(I2C2);
buf= *pBuffer;

/* Point to the next location where the byte read will be saved */
pBuffer++;

/* Decrement the read bytes counter */
NumByteToRead--;
}
}

/* Enable Acknowledgement to be ready for another reception */
I2C_AcknowledgeConfig(I2C2, ENABLE);
}