STM32的I2C-EEPROM已調試成功

萬利的I2C-EEPROM例程有些問題，經本人兩個晝夜的反復試驗，已修改完善。

修改了兩個地方，在void I2C_EE_BufferWrite(u8* pBuffer, u8 WriteAddr, u16 NumByteToWrite)寫操作函數和void I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)讀操作函數體內的開頭先要執行一句I2C_EE_WaitEepromStandbyState();

這樣在以后調用寫操作函數和讀操作函數時就不用執行I2C_EE_WaitEepromStandbyState()了。但上電復位后先要執行一次讀操作，以后就可以無限制的隨便調用這兩個函數了。

詳細如下。

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
#include "i2c_ee.h"
#include"delay.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define I2C_Speed 10000
#define I2C1_SLAVE_ADDRESS7 0xA0

#define I2C_PageSize 4

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
u16 EEPROM_ADDRESS;

/* Private function prototypes -----------------------------------------------*/

void I2C_Configuration(void);

/*******************************************************************************
* Function Name : I2C_Configuration
* Description : I2C Configuration
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void I2C_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;

/* Configure I2C1 pins: SCL and SDA */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;//開漏輸出
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* I2C configuration */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;//設置 I2C為 I2C模式
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;//I2C快速模式 Tlow / Thigh = 2

I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS7;//設置第一個設備地址
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;//使能應答
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;//應答 7位地址
I2C_InitStructure.I2C_ClockSpeed = I2C_Speed;//設置時鐘頻率
/* I2C Peripheral Enable */
I2C_Cmd(I2C1, ENABLE);//使能I2C外設
/* Apply I2C configuration after enabling it */
I2C_Init(I2C1, &I2C_InitStructure);
}

/*******************************************************************************
* Function Name : I2C_EE_Init
* Description : Initializes peripherals used by the I2C EEPROM driver.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void I2C_EE_Init()
{
/* I2C configuration */
I2C_Configuration();

/* depending on the EEPROM Address selected in the i2c_ee.h file */
#ifdef EEPROM_Block0_ADDRESS
/* Select the EEPROM Block0 to write on */
EEPROM_ADDRESS = EEPROM_Block0_ADDRESS;
#endif
#ifdef EEPROM_Block1_ADDRESS
/* Select the EEPROM Block1 to write on */
EEPROM_ADDRESS = EEPROM_Block1_ADDRESS;
#endif
#ifdef EEPROM_Block2_ADDRESS
/* Select the EEPROM Block2 to write on */
EEPROM_ADDRESS = EEPROM_Block2_ADDRESS;
#endif
#ifdef EEPROM_Block3_ADDRESS
/* Select the EEPROM Block3 to write on */
EEPROM_ADDRESS = EEPROM_Block3_ADDRESS;
#endif
}

/*******************************************************************************
* Function Name : I2C_EE_BufferWrite
* Description : Writes buffer of data to the I2C EEPROM.
* Input : - pBuffer : pointer to the buffer containing the data to be
* written to the EEPROM.
* - WriteAddr : EEPROMs internal address to write to.
* - NumByteToWrite : number of bytes to write to the EEPROM.
* Output : None
* Return : None
pBuffer：指向要寫入數據數組的指針
WriteAddr：24c02中要寫入數據的首地址
NumByteToWrite：寫入的字節數
*******************************************************************************/
void I2C_EE_BufferWrite(u8* pBuffer, u8 WriteAddr, u16 NumByteToWrite)//將緩沖器的數據寫入EEPROM
{
u8 NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0;

Addr = WriteAddr % I2C_PageSize;//寫入地址是每頁的第幾位
count = I2C_PageSize - Addr;//在開始的一頁要寫入的個數
NumOfPage = NumByteToWrite / I2C_PageSize;//要寫入的頁數
NumOfSingle = NumByteToWrite % I2C_PageSize;//不足一頁的個數
I2C_EE_WaitEepromStandbyState();//EEPROM設為待命狀態
/* If WriteAddr is I2C_PageSize aligned */
if(Addr == 0) //寫入地址是頁的開始
{
/* If NumByteToWrite < I2C_PageSize */
if(NumOfPage == 0) //數據小于一頁
{
I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);//寫少于一頁的數據
I2C_EE_WaitEepromStandbyState();//EEPROM設為待命狀態
}
/* If NumByteToWrite > I2C_PageSize */
else //數據大于等于一頁
{
while(NumOfPage--)//要寫入的頁數
{
I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize); //寫一頁的數據
I2C_EE_WaitEepromStandbyState();//EEPROM設為待命狀態
WriteAddr += I2C_PageSize;
pBuffer += I2C_PageSize;
}

if(NumOfSingle!=0)//剩余數據小于一頁
{
I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);//寫少于一頁的數據
I2C_EE_WaitEepromStandbyState();//EEPROM設為待命狀態
}
}
}
/* If WriteAddr is not I2C_PageSize aligned */
else //寫入地址不是頁的開始
{
/* If NumByteToWrite < I2C_PageSize */
if(NumOfPage== 0) //數據小于一頁
{
I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);//寫少于一頁的數據
I2C_EE_WaitEepromStandbyState();//EEPROM設為待命狀態
}
/* If NumByteToWrite > I2C_PageSize */
else//數據大于等于一頁
{
NumByteToWrite -= count;
NumOfPage = NumByteToWrite / I2C_PageSize; //重新計算要寫入的頁數
NumOfSingle = NumByteToWrite % I2C_PageSize;//重新計算不足一頁的個數

if(count != 0)//在此處count一定不為0，此判斷條件好象有點多余
{
I2C_EE_PageWrite(pBuffer, WriteAddr, count);//將開始的空間寫滿一頁
I2C_EE_WaitEepromStandbyState();//EEPROM設為待命狀態
WriteAddr += count;
pBuffer += count;
}

while(NumOfPage--)//要寫入的頁數
{
I2C_EE_PageWrite(pBuffer, WriteAddr, I2C_PageSize);//寫一頁的數據
I2C_EE_WaitEepromStandbyState();//EEPROM設為待命狀態
WriteAddr += I2C_PageSize;
pBuffer += I2C_PageSize;
}
if(NumOfSingle != 0)//剩余數據小于一頁
{
I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle); //寫少于一頁的數據
I2C_EE_WaitEepromStandbyState();//EEPROM設為待命狀態
}
}
}
}

/*******************************************************************************
* Function Name : I2C_EE_ByteWrite
* Description : Writes one byte to the I2C EEPROM.
* Input : - pBuffer : pointer to the buffer containing the data to be
* written to the EEPROM.
* - WriteAddr : EEPROMs internal address to write to.
* Output : None
* Return : None
pBuffer：指向要寫入數據數組的指針
WriteAddr：24c02中要寫入數據的首地址
*******************************************************************************/
void I2C_EE_ByteWrite(u8* pBuffer, u8 WriteAddr)//寫一個字節到EEPROM
{
/* Send STRAT condition */
I2C_GenerateSTART(I2C1, ENABLE);//產生 I2Cx傳輸 START條件

/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); //檢查最近一次 I2C事件是否是輸入的事件

/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);//向指定的從 I2C設備傳送地址字,選擇發送方向
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));//檢查最近一次 I2C事件是否是輸入的事件

/* Send the EEPROMs internal address to write to */
I2C_SendData(I2C1, WriteAddr);//通過外設 I2Cx發送地址
/* Test on EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));//檢查最近一次 I2C事件是否是輸入的事件

/* Send the byte to be written */
I2C_SendData(I2C1, *pBuffer); //通過外設 I2Cx發送數據

/* Test on EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));//檢查最近一次 I2C事件是否是輸入的事件
/* Send STOP condition */
I2C_GenerateSTOP(I2C1, ENABLE);//產生 I2Cx傳輸 STOP條件
}

/*******************************************************************************
* Function Name : I2C_EE_PageWrite
* Description : Writes more than one byte to the EEPROM with a single WRITE
* cycle. The number of byte cant exceed the EEPROM page size.
* Input : - pBuffer : pointer to the buffer containing the data to be
* written to the EEPROM.
* - WriteAddr : EEPROMs internal address to write to.
* - NumByteToWrite : number of bytes to write to the EEPROM.
* Output : None
* Return : None
pBuffer：指向要寫入數據數組的指針
WriteAddr：24c02中要寫入數據的首地址
NumByteToWrite：寫入的字節數
*******************************************************************************/
void I2C_EE_PageWrite(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite)//寫少于一頁的數據
{
/* Send START condition */
I2C_GenerateSTART(I2C1, ENABLE);//產生 I2Cx傳輸 START條件
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); //檢查最近一次 I2C事件是否是輸入的事件
/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);//向指定的從 I2C設備傳送地址字,選擇發送方向

/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); //檢查最近一次 I2C事件是否是輸入的事件

/* Send the EEPROMs internal address to write to */
I2C_SendData(I2C1, WriteAddr); //通過外設 I2Cx發送地址

/* Test on EV8 and clear it */
while(! I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); //檢查最近一次 I2C事件是否是輸入的事件

/* While there is data to be written */
while(NumByteToWrite--)
{
/* Send the current byte */
I2C_SendData(I2C1, *pBuffer); //通過外設 I2Cx發送數據

/* Point to the next byte to be written */
pBuffer++;
/* Test on EV8 and clear it */
while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));//檢查最近一次 I2C事件是否是輸入的事件
}

/* Send STOP condition */
I2C_GenerateSTOP(I2C1, ENABLE);//產生 I2Cx傳輸 STOP條件
}

/*******************************************************************************
* Function Name : I2C_EE_BufferRead
* Description : Reads a block of data from the EEPROM.
* Input : - pBuffer : pointer to the buffer that receives the data read
* from the EEPROM.
* - ReadAddr : EEPROMs internal address to read from.
* - NumByteToRead : number of bytes to read from the EEPROM.
* Output : None
* Return : None
pBuffer：指向要保存讀出數據的數組的指針
ReadAddr：24c02中要讀出數據的首地址
NumByteToRead：讀出的字節數
*******************************************************************************/
void I2C_EE_BufferRead(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)//將EEPROM的數據讀入緩沖器
{
I2C_EE_WaitEepromStandbyState();//EEPROM設為待命狀態
/* Send START condition */
I2C_GenerateSTART(I2C1, ENABLE);//產生 I2Cx傳輸 START條件
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));//檢查最近一次 I2C事件是否是輸入的事件
/* In the case of a single data transfer disable ACK before reading the data */
if(NumByteToRead==1)
{
I2C_AcknowledgeConfig(I2C1, DISABLE);//使能或者失能指定 I2C的應答功能
}
/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);//向指定的從 I2C設備傳送地址字,選擇發送方向

/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));//檢查最近一次 I2C事件是否是輸入的事件
/* Clear EV6 by setting again the PE bit */
I2C_Cmd(I2C1, ENABLE);//使能或者失能 I2C外設

/* Send the EEPROMs internal address to write to */
I2C_SendData(I2C1, ReadAddr); //通過外設 I2Cx發送地址

/* Test on EV8 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));//檢查最近一次 I2C事件是否是輸入的事件
/* Send STRAT condition a second time */
I2C_GenerateSTART(I2C1, ENABLE);//產生 I2Cx傳輸 START條件
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));//檢查最近一次 I2C事件是否是輸入的事件
/* Send EEPROM address for read */
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Receiver);//向指定的從 I2C設備傳送地址字,選擇接收方向
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));//檢查最近一次 I2C事件是否是輸入的事件
/* While there is data to be read */
while(NumByteToRead)
{
/* Test on EV7 and clear it */
if(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED)) //檢查最近一次 I2C事件是否是輸入的事件
{
if(NumByteToRead == 2)
{
/* Disable Acknowledgement */
I2C_AcknowledgeConfig(I2C1, DISABLE);//使能或者失能指定 I2C的應答功能
}

if(NumByteToRead == 1)
{
/* Send STOP Condition */
I2C_GenerateSTOP(I2C1, ENABLE);//產生 I2Cx傳輸 STOP條件
}

/* Read a byte from the EEPROM */
*pBuffer = I2C_ReceiveData(I2C1);//返回通過 I2Cx最近接收的數據

/* 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(I2C1, ENABLE);//使能或者失能指定 I2C的應答功能
}

/*******************************************************************************
* Function Name : I2C_EE_WaitEepromStandbyState
* Description : Wait for EEPROM Standby state
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void I2C_EE_WaitEepromStandbyState(void) //EEPROM設為待命狀態
{
vu16 SR1_Tmp = 0;

do
{
/* Send START condition */
I2C_GenerateSTART(I2C1, ENABLE);//產生 I2Cx傳輸 START條件
/* Read I2C1 SR1 register */
SR1_Tmp = I2C_ReadRegister(I2C1, I2C_Register_SR1);//讀取指定的 I2C寄存器 I2C_SR1 并返回其值
/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C1, EEPROM_ADDRESS, I2C_Direction_Transmitter);//向指定的從 I2C設備傳送地址字 ,選擇發送方向
}while(!(I2C_ReadRegister(I2C1, I2C_Register_SR1) & 0x0002));//地址發送結束
/* Clear AF flag */
I2C_ClearFlag(I2C1, I2C_FLAG_AF);//清除 I2Cx的應答錯誤標志位