stm32固件库I2C操作

作者: 光均 | 来源:发表于2020-11-02 01:43 被阅读0次

stm32固件库I2C操作
stm32固件库FSMC-SRAM操作
stm32固件库SPI操作
9.15总结
stm32固件库UART操作
stm32固件库Bitbang操作
STM32（5）：番外篇之stm32固件库工程搭建
stm32技术参考手册与stm32固件库文件下载
ST(意法半导体）官网下载STM32固件库的通用方法和步骤
STM32（4）：基于构件库的点亮LED

stm32固件库I2C操作

来源: 野火<零死角玩转STM32-F407>

野火eeprom.JPG

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

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



/* 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 I2C_OWN_ADDRESS7      0X0A   

/*I2C接口*/
#define EEPROM_I2C                          I2C1
#define EEPROM_I2C_CLK                      RCC_APB1Periph_I2C1
#define EEPROM_I2C_CLK_INIT                             RCC_APB1PeriphClockCmd

#define EEPROM_I2C_SCL_PIN                  GPIO_Pin_8                 
#define EEPROM_I2C_SCL_GPIO_PORT            GPIOB                       
#define EEPROM_I2C_SCL_GPIO_CLK             RCC_AHB1Periph_GPIOB
#define EEPROM_I2C_SCL_SOURCE               GPIO_PinSource8
#define EEPROM_I2C_SCL_AF                   GPIO_AF_I2C1

#define EEPROM_I2C_SDA_PIN                  GPIO_Pin_9                  
#define EEPROM_I2C_SDA_GPIO_PORT            GPIOB                       
#define EEPROM_I2C_SDA_GPIO_CLK             RCC_AHB1Periph_GPIOB
#define EEPROM_I2C_SDA_SOURCE               GPIO_PinSource9
#define EEPROM_I2C_SDA_AF                   GPIO_AF_I2C1

/*等待超时时间*/
#define I2CT_FLAG_TIMEOUT         ((uint32_t)0x1000)
#define I2CT_LONG_TIMEOUT         ((uint32_t)(10 * I2CT_FLAG_TIMEOUT))

/*信息输出*/
#define EEPROM_DEBUG_ON         0

#define EEPROM_INFO(fmt,arg...)           printf("<<-EEPROM-INFO->> "fmt"\n",##arg)
#define EEPROM_ERROR(fmt,arg...)          printf("<<-EEPROM-ERROR->> "fmt"\n",##arg)
#define EEPROM_DEBUG(fmt,arg...)          do{\
                                          if(EEPROM_DEBUG_ON)\
                                          printf("<<-EEPROM-DEBUG->> [%d]"fmt"\n",__LINE__, ##arg);\
                                          }while(0)

/* 
 * AT24C02 2kb = 2048bit = 2048/8 B = 256 B
 * 32 pages of 8 bytes each
 *
 * Device Address
 * 1 0 1 0 A2 A1 A0 R/W
 * 1 0 1 0 0  0  0  0 = 0XA0
 * 1 0 1 0 0  0  0  1 = 0XA1 
 */

/* EEPROM Addresses defines */
#define EEPROM_Block0_ADDRESS 0xA0   /* E2 = 0 */

================================

uint16_t EEPROM_ADDRESS;




static __IO uint32_t  I2CTimeout = I2CT_LONG_TIMEOUT;   


static uint32_t I2C_TIMEOUT_UserCallback(uint8_t errorCode);




/**
  * @brief  I2C1 I/O配置
  * @param  无
  * @retval 无
  */
static void I2C_GPIO_Config(void)
{

  GPIO_InitTypeDef  GPIO_InitStructure; 
   
  /*!< EEPROM_I2C Periph clock enable */
  EEPROM_I2C_CLK_INIT(EEPROM_I2C_CLK, ENABLE);
  
  /*!< EEPROM_I2C_SCL_GPIO_CLK and EEPROM_I2C_SDA_GPIO_CLK Periph clock enable */
  RCC_AHB1PeriphClockCmd(EEPROM_I2C_SCL_GPIO_CLK | EEPROM_I2C_SDA_GPIO_CLK, ENABLE);

  /*!< GPIO configuration */
  /* Connect PXx to I2C_SCL*/
  GPIO_PinAFConfig(EEPROM_I2C_SCL_GPIO_PORT, EEPROM_I2C_SCL_SOURCE, EEPROM_I2C_SCL_AF);
  /* Connect PXx to I2C_SDA*/
  GPIO_PinAFConfig(EEPROM_I2C_SDA_GPIO_PORT, EEPROM_I2C_SDA_SOURCE, EEPROM_I2C_SDA_AF);  
  
  /*!< Configure EEPROM_I2C pins: SCL */   
  GPIO_InitStructure.GPIO_Pin = EEPROM_I2C_SCL_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
  GPIO_Init(EEPROM_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);

  /*!< Configure EEPROM_I2C pins: SDA */
  GPIO_InitStructure.GPIO_Pin = EEPROM_I2C_SDA_PIN;
  GPIO_Init(EEPROM_I2C_SDA_GPIO_PORT, &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;    
  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;                            /* 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_OwnAddress1 =I2C_OWN_ADDRESS7; 
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable ;  
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; /* I2C的寻址模式 */
  I2C_InitStructure.I2C_ClockSpeed = I2C_Speed;                             /* 通信速率 */
  I2C_Init(EEPROM_I2C, &I2C_InitStructure);                                       /* I2C1 初始化 */
  I2C_Cmd(EEPROM_I2C, ENABLE);                                                      /* 使能 I2C1 */

  I2C_AcknowledgeConfig(EEPROM_I2C, 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 WriteAddr:写地址
  *     @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
  */
uint32_t I2C_EE_ByteWrite(u8* pBuffer, u8 WriteAddr)
{
  /* Send STRAT condition */
  I2C_GenerateSTART(EEPROM_I2C, ENABLE);

  I2CTimeout = I2CT_FLAG_TIMEOUT;

  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT))
  {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(0);
  }    

  /* Send EEPROM address for write */
  I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Transmitter);
  
  
  I2CTimeout = I2CT_FLAG_TIMEOUT;
  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
  {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(1);
  }    
      
  /* Send the EEPROM's internal address to write to */
  I2C_SendData(EEPROM_I2C, WriteAddr);
  
  I2CTimeout = I2CT_FLAG_TIMEOUT;

  /* Test on EV8 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))  
  {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(2);
  } 
  /* Send the byte to be written */
  I2C_SendData(EEPROM_I2C, *pBuffer); 
   
  I2CTimeout = I2CT_FLAG_TIMEOUT;

  /* Test on EV8 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
  {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(3);
  } 
  
  /* Send STOP condition */
  I2C_GenerateSTOP(EEPROM_I2C, ENABLE);
  
  return 1;
}

/**
  * @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
  *     @arg WriteAddr:写地址
  *     @arg NumByteToWrite:写的字节数
  * @retval  无
  */
uint32_t I2C_EE_PageWrite(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite)
{
  I2CTimeout = I2CT_LONG_TIMEOUT;

  while(I2C_GetFlagStatus(EEPROM_I2C, I2C_FLAG_BUSY))  
   {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(4);
  } 
  
  /* Send START condition */
  I2C_GenerateSTART(EEPROM_I2C, ENABLE);
  
  
  I2CTimeout = I2CT_FLAG_TIMEOUT;

  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT))
  {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(5);
  } 
  
  /* Send EEPROM address for write */
  I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Transmitter);
  
  I2CTimeout = I2CT_FLAG_TIMEOUT;

  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2C, 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_I2C, WriteAddr);  

  I2CTimeout = I2CT_FLAG_TIMEOUT;

  /* Test on EV8 and clear it */
  while(! I2C_CheckEvent(EEPROM_I2C, 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_I2C, *pBuffer); 

    /* Point to the next byte to be written */
    pBuffer++; 
  
    I2CTimeout = I2CT_FLAG_TIMEOUT;

    /* Test on EV8 and clear it */
    while (!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
    {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(8);
    } 
  }

  /* Send STOP condition */
  I2C_GenerateSTOP(EEPROM_I2C, ENABLE);
  
  return 1;
}

/**
  * @brief   从EEPROM里面读取一块数据 
  * @param   
  *     @arg pBuffer:存放从EEPROM读取的数据的缓冲区指针
  *     @arg WriteAddr:接收数据的EEPROM的地址
  *     @arg NumByteToWrite:要从EEPROM读取的字节数
  * @retval  无
  */
uint32_t I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)
{  
    I2CTimeout = I2CT_LONG_TIMEOUT;

  //*((u8 *)0x4001080c) |=0x80; 
    while(I2C_GetFlagStatus(EEPROM_I2C, I2C_FLAG_BUSY))   
    {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(9);
    }
  /* Send START condition */
  I2C_GenerateSTART(EEPROM_I2C, ENABLE);
  //*((u8 *)0x4001080c) &=~0x80;
  
  I2CTimeout = I2CT_FLAG_TIMEOUT;

  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT))
  {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(10);
   }

  /* Send EEPROM address for write */
  I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Transmitter);

  I2CTimeout = I2CT_FLAG_TIMEOUT;
 
  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) 
    {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(11);
   }
  /* Clear EV6 by setting again the PE bit */
  I2C_Cmd(EEPROM_I2C, ENABLE);

  /* Send the EEPROM's internal address to write to */
  I2C_SendData(EEPROM_I2C, ReadAddr);  

     I2CTimeout = I2CT_FLAG_TIMEOUT;

  /* Test on EV8 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
    {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(12);
   }
  /* Send STRAT condition a second time */  
  I2C_GenerateSTART(EEPROM_I2C, ENABLE);
  
     I2CTimeout = I2CT_FLAG_TIMEOUT;

  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_MODE_SELECT))
    {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(13);
   }
  /* Send EEPROM address for read */
  I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Receiver);
  
     I2CTimeout = I2CT_FLAG_TIMEOUT;

  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
    {
    if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(14);
   }
  /* While there is data to be read */
  while(NumByteToRead)  
  {
    if(NumByteToRead == 1)
    {
      /* Disable Acknowledgement */
      I2C_AcknowledgeConfig(EEPROM_I2C, DISABLE);
      
      /* Send STOP Condition */
      I2C_GenerateSTOP(EEPROM_I2C, ENABLE);
    }

        
        I2CTimeout = I2CT_LONG_TIMEOUT;
        while(I2C_CheckEvent(EEPROM_I2C, I2C_EVENT_MASTER_BYTE_RECEIVED)==0)  
        {
            if((I2CTimeout--) == 0) return I2C_TIMEOUT_UserCallback(3);
        }   
        {
          /* Read a byte from the device */
      *pBuffer = I2C_ReceiveData(EEPROM_I2C);

      /* 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(EEPROM_I2C, ENABLE);
  
  return 1;
}

/**
  * @brief  Wait for EEPROM Standby state 
  * @param  无
  * @retval 无
  */
void I2C_EE_WaitEepromStandbyState(void)      
{
  vu16 SR1_Tmp = 0;

  do
  {
    /* Send START condition */
    I2C_GenerateSTART(EEPROM_I2C, ENABLE);
    /* Read EEPROM_I2C SR1 register */
    SR1_Tmp = I2C_ReadRegister(EEPROM_I2C, I2C_Register_SR1);
    /* Send EEPROM address for write */
    I2C_Send7bitAddress(EEPROM_I2C, EEPROM_ADDRESS, I2C_Direction_Transmitter);
  }while(!(I2C_ReadRegister(EEPROM_I2C, I2C_Register_SR1) & 0x0002));
  
  /* Clear AF flag */
  I2C_ClearFlag(EEPROM_I2C, I2C_FLAG_AF);
  /* STOP condition */    
  I2C_GenerateSTOP(EEPROM_I2C, ENABLE); 
}



/**
  * @brief  Basic management of the timeout situation.
  * @param  errorCode：错误代码，可以用来定位是哪个环节出错.
  * @retval 返回0，表示IIC读取失败.
  */
static  uint32_t I2C_TIMEOUT_UserCallback(uint8_t errorCode)
{
  /* Block communication and all processes */
  EEPROM_ERROR("I2C 等待超时!errorCode = %d",errorCode);
  
  return 0;
}

============================

#define  EEP_Firstpage      0x00

/**
  * @brief  I2C(AT24C02)读写测试
  * @param  无
  * @retval 正常返回1 ，不正常返回0
  */
uint8_t I2C_Test(void)
{
    u16 i;

    EEPROM_INFO("写入的数据");
    
    for ( i=0; i<=255; i++ ) //填充缓冲
  {   
    I2c_Buf_Write[i] = i;

    printf("0x%02X ", I2c_Buf_Write[i]);
    if(i%16 == 15)    
        printf("\n\r");    
   }

  //将I2c_Buf_Write中顺序递增的数据写入EERPOM中 
    I2C_EE_BufferWrite( I2c_Buf_Write, EEP_Firstpage, 256);
  
  EEPROM_INFO("写成功");
   
  EEPROM_INFO("读出的数据");
  //将EEPROM读出数据顺序保持到I2c_Buf_Read中
    I2C_EE_BufferRead(I2c_Buf_Read, EEP_Firstpage, 256); 
   
  //将I2c_Buf_Read中的数据通过串口打印
    for (i=0; i<256; i++)
    {   
        if(I2c_Buf_Read[i] != I2c_Buf_Write[i])
        {
            printf("0x%02X ", I2c_Buf_Read[i]);
            EEPROM_ERROR("错误:I2C EEPROM写入与读出的数据不一致");
            return 0;
        }
    printf("0x%02X ", I2c_Buf_Read[i]);
    if(i%16 == 15)    
        printf("\n\r");
    
    }
  EEPROM_INFO("I2C(AT24C02)读写测试成功");
    return 1;
}

===============

    I2C_EE_Init();
                aa=I2C_Test();

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