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标题: 【晒FRAM铁电存储器样片】+ STM32硬件IIC驱动FRAM成功 [打印本页]

作者: youki1234 时间: 2014-8-4 16:51 标题: 【晒FRAM铁电存储器样片】+ STM32硬件IIC驱动FRAM成功

现在大多数工业控制中都是使用的32位机器，而这些32位机器一般来说都有硬件IIC，使用硬件IIC不但节约CPU资源，同时也能得到更快的速度。最近在研究STM32，所以也就顺便测试了一下如何使用STM32的IIC来操作，核心代码包含IIC初始化，DMA初始化，中断处理函数。

IIC初始化函数
//*************************************************//
// 函数名  : I2C_Configuration                      //
// 功能 : 配置I2C                               //
// Input : None                                  //
// Output  : None                                  //
// Return  : None                                  //
//*************************************************//
void I2C_Configuration(void)
{
I2C_InitTypeDef  I2C_InitStructure;

/* I2C configuration */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = EEPROM_ADDRESS;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress =    I2C_AcknowledgedAddress_7bit;
#ifdef I2C_1
I2C_InitStructure.I2C_ClockSpeed = I2C_Speed_I1;
/* I2C Peripheral Enable */
I2C_Cmd(I2C1, ENABLE);
/* Apply I2C configuration after enabling it */
I2C_Init(I2C1, &I2C_InitStructure);
#endif

#ifdef I2C_2
I2C_InitStructure.I2C_ClockSpeed = I2C_Speed_I2;
/* I2C Peripheral Enable */
I2C_Cmd(I2C2, ENABLE);
/* Apply I2C configuration after enabling it */
I2C_Init(I2C2, &I2C_InitStructure);
#endif
}
//*************************************************//
// 函数名  : I2C_EE_Init                         //
// 功能 : 初始化I2C                               //
// Input : None                                  //
// Output  : None                                  //
// Return  : None                                  //
//*************************************************//
void I2C_EE_Init()
{
//配置时钟
RCC_Configuration_I2C();
//配置IO
GPIO_Configuration_I2C();
#ifdef I2C_DMA_I1
//配置NVIC
NVIC_Configuration_I2C_1();
#endif
#ifdef I2C_DMA_I2
//配置NVIC
NVIC_Configuration_I2C_2();
#endif
//配置I2C
I2C_Configuration();
}

IIC写入数据：
void I2C_EE_MultiByteWrite_I1(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite)
{
u8 i = 0;

if(NumByteToWrite > I2C_PageSize)
      NumByteToWrite = I2C_PageSize;

/* 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));

I2C_SendData(I2C1, (u8)WriteAddr);

/* Test on EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

for (i = 0; i < NumByteToWrite; i++,pBuffer++)
{
      I2C_SendData(I2C1, *pBuffer);
      /* Test on EV8 and clear it */
      while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}
/* Send STOP condition */
I2C_GenerateSTOP(I2C1, ENABLE);
}

IIC读取数据
void I2C_EE_MultiByteRead_I1(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)
{
u8 i = 0;

if(NumByteToRead > I2C_PageSize)
      NumByteToRead = I2C_PageSize;

/* 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));

I2C_SendData(I2C1, (u8)ReadAddr);

/* Test on EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

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

/* 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 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));

for (i = NumByteToRead; i > 0; i--,pBuffer++)
{
      if (i == 1)
      {
         I2C_AcknowledgeConfig(I2C1, DISABLE);
         while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
         *pBuffer = I2C_ReceiveData(I2C1);
         I2C_AcknowledgeConfig(I2C1, ENABLE);

      }
      else
      {
         I2C_AcknowledgeConfig(I2C1, ENABLE);
         while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));
         *pBuffer = I2C_ReceiveData(I2C1);
         i=i;
      }
}

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

}

关键函数就是这几个，具体程序可以看附件，直接拷贝到你的工程，更改下引脚用就行了

附件: 桌面.rar (2014-8-4 16:51, 5.05 KB) / 下载次数 956
http://bbs.eccn.com/attachment.php?aid=46245&k=81efdb6c119a496d082ccdea1c77d41d&t=1732220018&sid=03rlr4

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