I2C1改I2C2 。求指导

不只是路人

/**

  * @brief   i2c EEPROM(AT24C02)应用函数bsp
  *********************************************
  * @attention
  *
  
  
  * 淘宝    :http://firestm32.taobao.com
  *
  *****************
  */

#include "bsp_i2c_ee.h"

/* STM32 I2C 快速模式 */
#define I2C_Speed              400000

/* 这个地址只要与STM32外挂的I2C器件地址不一样即可 */
#define I2C2_OWN_ADDRESS7      0X0A   

/* AT24C01/02每页有8个字节 */
#define I2C_PageSize           64

/* AT24C04/08A/16A每页有16个字节 */
//#define I2C_PageSize           16                       

uint16_t EEPROM_ADDRESS;

/**
  * @brief  I2C2 I/O配置
  * @param  无
  * @retval 无
  */
static void I2C_GPIO_Config(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;

        /* 使能与 I2C2 有关的时钟 */
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2,ENABLE);  
   
  /* PB6-I2C2_SCL、PB7-I2C2_SDA*/
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_10 | GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;               // 开漏输出
  GPIO_Init(GPIOB, &GPIO_InitStructure);
}

/**
  * @brief  I2C 工作模式配置
  * @param  无
  * @retval 无
  */
static void I2C_Mode_Configu(void)
{
  I2C_InitTypeDef  I2C_InitStructure;

  /* I2C 配置 */
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
       
        /* 高电平数据稳定，低电平数据变化 SCL 时钟线的占空比 */
  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
       
  I2C_InitStructure.I2C_OwnAddress1 =I2C2_OWN_ADDRESS7;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable ;
       
        /* I2C的寻址模式 */
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
       
        /* 通信速率 */
  I2C_InitStructure.I2C_ClockSpeed = I2C_Speed;
  
        /* I2C2 初始化 */
  I2C_Init(I2C2, &I2C_InitStructure);
  
        /* 使能 I2C2 */
  I2C_Cmd(I2C2, ENABLE);   
}

/**
  * @brief  I2C 外设(EEPROM)初始化
  * @param  无
  * @retval 无
  */
void I2C_EE_Init(void)
{

  I2C_GPIO_Config();

  I2C_Mode_Configu();

/* 根据头文件i2c_ee.h中的定义来选择EEPROM要写入的地址 */
#ifdef EEPROM_Block0_ADDRESS
  /* 选择 EEPROM Block0 来写入 */
  EEPROM_ADDRESS = EEPROM_Block0_ADDRESS;
#endif

#ifdef EEPROM_Block1_ADDRESS  
        /* 选择 EEPROM Block1 来写入 */
  EEPROM_ADDRESS = EEPROM_Block1_ADDRESS;
#endif

#ifdef EEPROM_Block2_ADDRESS  
        /* 选择 EEPROM Block2 来写入 */
  EEPROM_ADDRESS = EEPROM_Block2_ADDRESS;
#endif

#ifdef EEPROM_Block3_ADDRESS  
        /* 选择 EEPROM Block3 来写入 */
  EEPROM_ADDRESS = EEPROM_Block3_ADDRESS;
#endif
}

/**
  * @brief   将缓冲区中的数据写到I2C EEPROM中
  * @param   
  *                @arg pBuffer:缓冲区指针
  *               
  *     @arg NumByteToWrite:写的字节数
  * @retval  无
  */
void 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();
      }
    }
  }  
}

/**
  * @brief   写一个字节到I2C EEPROM中
  * @param   
  *                @arg pBuffer:缓冲区指针
  *                @arg WriteAddr:写地址
  * @retval  无
  */
void I2C_EE_ByteWrite(u8* pBuffer, u8 WriteAddr)
{
  /* Send STRAT condition */
  I2C_GenerateSTART(I2C2, ENABLE);

  /* 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));
      
  /* Send the EEPROM's internal address to write to */
  I2C_SendData(I2C2, WriteAddr);
  
  /* Test on EV8 and clear it */
  while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  /* Send the byte to be written */
  I2C_SendData(I2C2, *pBuffer);
   
  /* Test on EV8 and clear it */
  while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
  
  /* Send STOP condition */
  I2C_GenerateSTOP(I2C2, ENABLE);
}

/**
  * @brief   在EEPROM的一个写循环中可以写多个字节，但一次写入的字节数
  *          不能超过EEPROM页的大小，AT24C02每页有8个字节
  * @param   
  *                @arg pBuffer:缓冲区指针

  */
void I2C_EE_PageWrite(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite)
{
    while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY)); // Added by Najoua 27/08/2008
   
  /* Send START condition */
  I2C_GenerateSTART(I2C2, ENABLE);
  
  /* 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));  

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

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

  /* While there is data to be written */
  while(NumByteToWrite--)  
  {
    /* Send the current byte */
    I2C_SendData(I2C2, *pBuffer);

    /* Point to the next byte to be written */
    pBuffer++;
  
    /* Test on EV8 and clear it */
    while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
  }

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

/**
  * @brief  
  *       
  *     @arg NumByteToWrite:要从EEPROM读取的字节数
  * @retval  无
  */
void I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)
{  
  //*((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));
  
  /* */  
  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);
    }

    /*  */
    if(I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_RECEIVED))  
    {      
      /* Read a byte from the EEPROM */
      *pBuffer = I2C_ReceiveData(I2C2);

      /* Point to the next location where the byte read will be saved */
      pBuffer++;
      
      /* Decrement the read bytes counter */
      NumByteToRead--;        
    }   
  }

  /* Enable eption */
  I2C_AcknowledgeConfig(I2C2, ENABLE);
}

/**
  * @br
  */
void I2C_EE_WaitEepromStandbyState(void)      
{
  vu16 SR1_Tmp = 0;

  do
  {
    /* Send START condition */
    I2C_GenerateSTART(I2C2, ENABLE);
    /* Read I2C2 SR1 register */
    SR1_Tmp = I2C_ReadRegister(I2C2, I2C_Register_SR1);
    /* Send EEPROM address for write */
    I2C_Send7bitAddress(I2C2, EEPROM_ADDRESS, I2C_Direction_Transmitter);
  }while(!(I2C_ReadRegister(I2C2, I2C_Register_SR1) & 0x0002));
  
  /* Clear AF flag */
  I2C_ClearFlag(I2C2, I2C_FLAG_AF);
    /* STOP condition */   
    I2C_GenerateSTOP(I2C2, ENABLE);
}

flyleaf

注意外部要加上拉电阻