STM32 I2C AT24C02驅(qū)動

工程結(jié)構(gòu)圖：

1、main.c

#include"stm32f10x.h"
#include"usart1.h"
#include"led.h"
#include"i2c_at24c02.h"
#include

struct Contact{
u8 Name[15]; //姓名
u8 Phone[11];//電話
u8 BirthDay[10];//生日
}WgchnlnContact[3],NewContact;
struct Contact WgchnlnContact[3]={
{
"wgchnln",
"18682101373",
"1987-02-19",
},
{
"hezepan",
"18528473728",
"1987-10-28",
},
{
"lixiaowei",
"13527492729",
"1988-12-02",
}};

#ifdef Test

void I2C_Test(void)
{
u16 i;
u8 I2c_Buf[256];

printf("寫入的數(shù)據(jù)");

//填充緩沖
for(i=0;i<=255;i++)
{
I2c_Buf[i]=i;
printf("0x%x ",I2c_Buf[i]);
if(i == 9)
{
printf("");
}
}
printf("");

I2C_AT24Cx_Writes(0,I2c_Buf,256);//將I2C_Buf中順序遞增的數(shù)據(jù)寫入EERPOM中

//清緩沖
for(i=0;i<=255;i++)
{
I2c_Buf[i]=0;
}

printf("讀出的數(shù)據(jù)");
I2C_AT24Cx_Reads(0,I2c_Buf,256);//將EEPROM讀出數(shù)據(jù)順序保持到I2C_Buf中

//將I2C_Buf中的數(shù)據(jù)通過串口打印
for(i=0;i<256;i++)
{
if(I2c_Buf[i]!=i)
{
printf("錯誤:I2C EEPROM寫入與讀出的數(shù)據(jù)不一致");
while(1);
}
printf("0x%X ", I2c_Buf[i]);
if(i == 9)
{
printf("");
}
}
}
#endif

int main(void)
{
u8 ReadBuffer[36];
u8 i=0;
u8 j=0;
USART_Config(); //串口1初始化
printf("這是一個I2C-EEPROM-AT24C02演示實驗");

//Led_Init(); //LED初始化

I2C_AT24Cx_Init(); //I2C初始化

#ifdef Test
I2C_Test();
#endif

printf("寫入聯(lián)系人");
for(j=0;j<3;j++)
{
I2C_AT24Cx_Writes(0+j*36,WgchnlnContact[j].Name,15);
I2C_AT24Cx_Writes(15+j*36,WgchnlnContact[j].Phone,11);
I2C_AT24Cx_Writes(26+j*36,WgchnlnContact[j].BirthDay,10);
}
j=0;

printf("讀出聯(lián)系人");
for(j=0;j<3;j++)
{
I2C_AT24Cx_Reads(j*36,ReadBuffer,36);

for(i=0;i<15;i++)
{
NewContact.Name[i]=ReadBuffer[i];
}
i=0;
printf("姓名:%s",NewContact.Name);

for(i=0;i<11;i++)
{
NewContact.Phone[i]=ReadBuffer[i+15];
}
i=0;
printf("電話:%s",NewContact.Phone);//為什么打印第二個聯(lián)系人的號碼電話會把第一個聯(lián)系人的生日一同打印出來

for(i=0;i<10;i++)
{
NewContact.BirthDay[i]=ReadBuffer[i+26];
}
i=0;
printf("生日:%s",NewContact.BirthDay);

}
while(1);
}

2、今天的主角：i2c_at24c02.c

#include"stm32f10x.h"
#include"i2c_at24c02.h"

#define AT24Cx_Address 0xa0 //I2C芯片地址 EEPROM
#define AT24Cx_PageSize 8 //芯片內(nèi)部一頁容量


static void I2C_ATC24x_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_APB2PeriphClockCmd(I2C_SCL_GPIO_RCC,ENABLE); //沒有外部中斷,沒有重映射,所以不需要開啟復用功能


GPIO_InitStructure.GPIO_Pin =I2C_SCL_Pin|I2C_SDA_Pin;
GPIO_InitStructure.GPIO_Speed =GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF_OD; //設置管腳為復用功能開漏輸出 SDA是輸入輸出引腳

GPIO_Init(I2C_SCL_GPIO, &GPIO_InitStructure);
}

static void I2C_Config(void)
{
I2C_InitTypeDef I2C_InitStructure;

RCC_APB1PeriphClockCmd(I2C_RCC,ENABLE);

I2C_DeInit(I2C);

I2C_InitStructure.I2C_ClockSpeed =100000; //100KHz I2C時鐘頻率
I2C_InitStructure.I2C_Mode =I2C_Mode_I2C; //I2C模式
I2C_InitStructure.I2C_DutyCycle =I2C_DutyCycle_2; //時鐘占空比
I2C_InitStructure.I2C_OwnAddress1 =0x30; //主機地址 可以任意的
I2C_InitStructure.I2C_Ack =I2C_Ack_Enable; //開啟ACK應答響應
I2C_InitStructure.I2C_AcknowledgedAddress =I2C_AcknowledgedAddress_7bit;//7位地址模式 非10為地址模式

I2C_Init(I2C,&I2C_InitStructure);

I2C_Cmd(I2C,ENABLE);

I2C_AcknowledgeConfig(I2C,ENABLE);
}

void I2C_AT24Cx_Init(void)
{
I2C_ATC24x_GPIO_Config();

I2C_Config();
}

void I2C_AT24Cx_Reads(u8 Address,u8 *ReadBuffer,u16 ReadNumber)
{
if(ReadNumber==0) //沒有需要讀取的數(shù)據(jù)
return;

while(I2C_GetFlagStatus(I2C,I2C_FLAG_BUSY));

I2C_AcknowledgeConfig(I2C, ENABLE);

I2C_GenerateSTART(I2C,ENABLE);
while(!I2C_CheckEvent(I2C,I2C_EVENT_MASTER_MODE_SELECT)); //檢查是不是主模式與起始位已經(jīng)發(fā)送 備注:這樣做的目的就是為了清空該事件

I2C_Send7bitAddress(I2C,AT24Cx_Address, I2C_Direction_Transmitter);
while (!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));//檢查數(shù)據(jù)是不是已經(jīng)發(fā)送地址完成

I2C_SendData(I2C, Address);
while (!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); //檢查數(shù)據(jù)是不是已經(jīng)發(fā)送完成

//需要讀取數(shù)據(jù)，這個時候需要變換數(shù)據(jù)傳輸方向，就要主機重新發(fā)送起始位
I2C_GenerateSTART(I2C, ENABLE);
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_MODE_SELECT));


I2C_Send7bitAddress(I2C,AT24Cx_Address, I2C_Direction_Receiver); //再一次發(fā)送EEPROM地址
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));

while(ReadNumber)
{

if(ReadNumber==1)
{
I2C_AcknowledgeConfig(I2C, DISABLE);//關(guān)閉應答
I2C_GenerateSTOP(I2C,ENABLE);//使能停止功能
}

while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_BYTE_RECEIVED)); //檢查是不是接受到了數(shù)據(jù)
*ReadBuffer=I2C_ReceiveData(I2C);
ReadBuffer++;
ReadNumber--;
}
I2C_AcknowledgeConfig(I2C, ENABLE);//允許應答模式
}

static void I2C_AT24Cx_WaitForComplete(void)
{
vu16 SR1_Tmp;
do
{

I2C_GenerateSTART(I2C1, ENABLE); //一旦發(fā)送起始位，主機等待讀取SR1，然后發(fā)送地址

SR1_Tmp = I2C_ReadRegister(I2C1, I2C_Register_SR1); //也是為了清除該事件

I2C_Send7bitAddress(I2C1,AT24Cx_Address, I2C_Direction_Transmitter);
}while(!(I2C_ReadRegister(I2C1, I2C_Register_SR1) & 0x0002)); //直到地址發(fā)送完成


I2C_ClearFlag(I2C, I2C_FLAG_AF); //前面如果出現(xiàn)過忙碌 就會出現(xiàn)應答錯誤現(xiàn)象

I2C_GenerateSTOP(I2C, ENABLE);
}

void I2C_AT24Cx_WriteByte(u8 Address,u8 WriteData)
{

I2C_GenerateSTART(I2C, ENABLE);
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_MODE_SELECT));

I2C_Send7bitAddress(I2C,AT24Cx_Address, I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); //實際就是等待收到EEPROM的ACK應答信號(收到ACK后，硬件會做相應的置位)


I2C_SendData(I2C, Address);
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

I2C_SendData(I2C, WriteData);
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED));


I2C_GenerateSTOP(I2C, ENABLE); //這里的設置停止為與接收時不同 這里是寫入最后一個數(shù)據(jù)之后設置停止位

I2C_AT24Cx_WaitForComplete();
}

void I2C_AT24Cx_WritePage(u8 Address,u8 *WriteData,u16 WriteNumber)
{
while(I2C_GetFlagStatus(I2C, I2C_FLAG_BUSY));

I2C_GenerateSTART(I2C, ENABLE);
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_MODE_SELECT));

I2C_Send7bitAddress(I2C,AT24Cx_Address, I2C_Direction_Transmitter);
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));


I2C_SendData(I2C,Address);
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

while(WriteNumber--)
{
I2C_SendData(I2C,*WriteData);
WriteData++;
while(!I2C_CheckEvent(I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}


I2C_GenerateSTOP(I2C, ENABLE);
}

void I2C_AT24Cx_Writes(u8 Address,u8 *WriteData,u16 WriteNumber)
{
u8 Temp;


Temp=Address%AT24Cx_PageSize;
if(Temp)//存在頁不對齊的現(xiàn)象
{
Temp=AT24Cx_PageSize-Temp;//求出頁不對齊的數(shù)量
I2C_AT24Cx_WritePage(Address,WriteData,Temp);
Address+=Temp;
WriteData+=Temp;
WriteNumber-=Temp;
I2C_AT24Cx_WaitForComplete();
}

while(WriteNumber)
{

if(WriteNumber>=AT24Cx_PageSize)
{
I2C_AT24Cx_WritePage(Address,WriteData,AT24Cx_PageSize);
Address+=AT24Cx_PageSize;
WriteData+=AT24Cx_PageSize;
WriteNumber-=AT24Cx_PageSize;
I2C_AT24Cx_WaitForComplete();
}

else
{
I2C_AT24Cx_WritePage(Address,WriteData,WriteNumber);
WriteNumber=0;
I2C_AT24Cx_WaitForComplete();
}
}
}

i2c_at24c02.h

#ifndef _I2C_AT24C02_H
#define _I2C_AT24C02_H

#include"stm32f10x.h"

#define I2C I2C1
#define I2C_RCC RCC_APB1Periph_I2C1

#define I2C_SCL_GPIO_RCC RCC_APB2Periph_GPIOB
#define I2C_SCL_GPIO GPIOB
#define I2C_SCL_Pin GPIO_Pin_6

#define I2C_SDA_GPIO_RCC RCC_APB2Periph_GPIOB
#define I2C_SDA_GPIO GPIOB
#define I2C_SDA_Pin GPIO_Pin_7

void I2C_AT24Cx_Init(void); //I2C外設與AT24C02初始化

void I2C_AT24Cx_Reads(u8 Address,u8 *ReadBuffer,u16 ReadNumber); //從AT24C02中讀取數(shù)據(jù) EEPROM

void I2C_AT24Cx_WriteByte(u8 Address,u8 WriteData); //寫入一字節(jié)數(shù)據(jù)

void I2C_AT24Cx_WritePage(u8 Address,u8 *WriteData,u16 WriteNumber); //寫入一頁之內(nèi)數(shù)據(jù)

void I2C_AT24Cx_Writes(u8 Address,u8 *WriteData,u16 WriteNumber); //寫入任意數(shù)量的數(shù)據(jù) 流程：寫入也不對齊部分--寫入整頁部分(假如需要)--寫入最后不足一頁的
#endif

剩下的串口驅(qū)動與LED驅(qū)動分別見：《STM32 串口例程之查詢收發(fā)》、《STM32 基于庫函數(shù)控制按鍵 蜂鳴器 LED顯示》完全一樣的。這里就不在重復上代碼了。

以上，結(jié)束。