Arduino与Proteus仿真实例-I2C总线多个M24C01设备数据储存仿真

I2C总线多个M24C01设备数据储存仿真

I2C 总线是一种非常流行且功能强大的总线，用于主机（或多个主机）与单个或多个从设备之间的通信。下图说明了有多少不同的外设可以共享仅通过 2 条线连接到处理器的总线，这是 I2C 总线与其他接口相比可以提供的最大优势之一。

本次实例将实现4个M24C01串行(I2C)EEPROM设备连接到I2C总线上，进行单独控制数据存取。

在前面的文章中，对I2C以及M24C01设备驱动进行了详细介绍，请参考：

1、仿真电路原理图

开关SW2分别对四个M24C01设备进行选择，按键Read和Write分别对设备进行数据读写操作。

2、仿真代码实现

本次实例使用了如下开源库：

Eeprom24C01_02

演示代码如下：

#include <Eeprom24C01\_02.h>
#define EEPROM\_ADDRESS\_1 0x50
#define EEPROM\_ADDRESS\_2 0x51
#define EEPROM\_ADDRESS\_3 0x52
#define EEPROM\_ADDRESS\_4 0x53
int readPin = 2;
int writePin = 3;
int eepromSelectPin1 = 4;
int eepromSelectPin2 = 5;
int eepromSelectPin3 = 6;
int eepromSelectPin4 = 7;
int selectPin = -1;
uint8\_t counts1 = 1;
uint8\_t counts2 = 1;
uint8\_t counts3 = 1;
uint8\_t counts4 = 1;
byte readState;
byte writeState;

static Eeprom24C01_02 eeprom1(EEPROM_ADDRESS_1);
static Eeprom24C01_02 eeprom2(EEPROM_ADDRESS_2);
static Eeprom24C01_02 eeprom3(EEPROM_ADDRESS_3);
static Eeprom24C01_02 eeprom4(EEPROM_ADDRESS_4);

void read\_interrupt(){
  readState = 1;
}

void write\_interrupt(){
  writeState = 1;
}

void setup(){
  pinMode(readPin,INPUT);
  pinMode(writePin,INPUT);
  pinMode(eepromSelectPin1,INPUT);
  pinMode(eepromSelectPin2,INPUT);
  pinMode(eepromSelectPin3,INPUT);
  pinMode(eepromSelectPin4,INPUT);
  // 绑定中断
  attachInterrupt(digitalPinToInterrupt(readPin),read_interrupt,RISING);
  attachInterrupt(digitalPinToInterrupt(writePin),write_interrupt,RISING);
  
  Serial.begin(9600);

 // 设备初始化
  eeprom1.initialize();
  eeprom2.initialize();
  eeprom3.initialize();
  eeprom4.initialize();
  Serial.println("\*\*\*\*EEPROM 24C01 \*\*\*\*");
}

void loop(){
  // 第一个设备读写
  if(digitalRead(eepromSelectPin1) == HIGH){
    if(readState){
      int value = eeprom1.readByte(0);
      Serial.print("read device 1:");
      Serial.print(value);
      Serial.println();
      readState = 0;
    }
  
    if(writeState){
      Serial.print("write device 1:");
      Serial.print(counts1);
      Serial.println();
      eeprom1.writeByte(0, counts1);
      counts1++;
      writeState = 0;  
    }
  }

   // 第二个设备读写
  if(digitalRead(eepromSelectPin2) == HIGH){
    if(readState){
      int value = eeprom2.readByte(0);
      Serial.print("read device 2:");
      Serial.print(value);
      Serial.println();
      readState = 0;
    }
  
    if(writeState){
      Serial.print("write device 2:");
      Serial.print(counts2);
      Serial.println();
      eeprom2.writeByte(0, counts2);
      counts2++;
      writeState = 0;  
    }
  }

   // 第三个设备读写
  if(digitalRead(eepromSelectPin3) == HIGH){
    if(readState){
      int value = eeprom3.readByte(0);
      Serial.print("read device 3:");
      Serial.print(value);
      Serial.println();
      readState = 0;
    }
  
    if(writeState){
      Serial.print("write device 3:");
      Serial.print(counts3);
      Serial.println();
      eeprom3.writeByte(0, counts3);
      counts3++;
      writeState = 0;  
    }
  }

   // 第四个设备读写
  if(digitalRead(eepromSelectPin4) == HIGH){
    if(readState){
      int value = eeprom4.readByte(0);
      Serial.print("read device 4:");
      Serial.print(value);
      Serial.println();
      readState = 0;
    }
  
    if(writeState){
      Serial.print("write device 4:");
      Serial.print(counts4);
      Serial.println();
      eeprom4.writeByte(0, counts4);
      counts4++;
      writeState = 0;  
    }
  }
}