硬件IIC

冥王神话

今天写了个硬件IIC程序，写的是存一个数据，然后读出来（这个和书上的代码不同，书上的代码不能确定字节地址的）。直接烧录到开发板上用串口查看，发现得到的数值比预计的多1，然后仿真看数值，结果是一样的，求解。

#define  EEP_Firstbyte                0x01
u8 I2c_Buf_Write;
u8 I2c_Buf_Read;


void I2C_EE_ByteWrite(u8 pBuffer, u8 WriteAddr)
{
  /* Send STRAT condition */
  I2C_GenerateSTART(I2C1, ENABLE);

  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));  

  /* Send EEPROM address for write */
  I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);

  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

  /* Send the EEPROM's internal address to write to */
  I2C_SendData(I2C1, WriteAddr);

  /* Test on EARM and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  /* Send the byte to be written */
  I2C_SendData(I2C1, pBuffer);

  /* Test on EARM and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  /* Send STOP condition */
  I2C_GenerateSTOP(I2C1, ENABLE);
}



void I2C_EE_ByteRead(u8 ReadAddr)
{  
        //*((u8 *)0x4001080c) |=0x80;
        while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY)); // Added by Najoua 27/08/2008   
       
        /* Send START condition */
        I2C_GenerateSTART(I2C1, ENABLE);
        //*((u8 *)0x4001080c) &=~0x80;
       
        /* Test on EV5 and clear it */
        while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
       
        /* Send EEPROM address for write */
        I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);
       
        /* Test on EV6 and clear it */
        while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
       
        /* Clear EV6 by setting again the PE bit */
        I2C_Cmd(I2C1, ENABLE);
       
        /* Send the EEPROM's internal address to write to */
        I2C_SendData(I2C1, ReadAddr);  
       
        /* Test on EARM and clear it */
        while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
       
        /* Send STRAT condition a second time */  
        I2C_GenerateSTART(I2C1, ENABLE);
       
        /* Test on EV5 and clear it */
        while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
       
        /* Send EEPROM address for read */
        I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Receiver);
       
        /* Test on EV6 and clear it */
        while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
       
        I2c_Buf_Read = I2C_ReceiveData(I2C1);

//        while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));

        I2C_AcknowledgeConfig(I2C1, DISABLE);       
        /* Send STOP Condition */
        I2C_GenerateSTOP(I2C1, ENABLE);
}


void I2C_Test(void)
{       
        printf("写入的数据\n\r");
        I2c_Buf_Write=10;
        I2C_EE_ByteWrite(I2c_Buf_Write, EEP_Firstbyte);
        I2C_EE_WaitEepromStandbyState();
        printf("\n\r写成功\n\r");
       
        printf("\n\r读出的数据\n\r");       
        I2C_EE_ByteRead(EEP_Firstbyte);
        if(I2c_Buf_Read != I2c_Buf_Write)
        {
                printf("0x%02X ", I2c_Buf_Read);
                printf("错误:I2C EEPROM写入与读出的数据不一致\n\r");
                return;
        }
        printf("0x%02X \n", I2c_Buf_Read);

        printf("I2C(AT24C02)读写测试成功\n\r");
}

冥王神话

这是仿真，然后打印的结果。

冥王神话

说错了，不仿真，全速运行的结果是0xA1，怎么成了EEPROM的接收地址了？反正仿真打印结果是对的。

冥王神话

不仿真，全速运行的结果。