I2C模块 外接EEPROM和相关知识点

/*
* File: main.c
* Author: Colder
*
* Created on 2016-11-17,5:02
*
*/

#include <stdio.h>
#include <stdlib.h>
#include "p30f6014.h"

unsigned long int i;
unsigned int WriteTable[16] = {0x00,0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88,0x99,0xaa,0xbb,0xcc,0xdd,0xee,0xff};
unsigned int ReadTable[16];

unsigned int ControlByteW = 0xa0;
unsigned int ControlByteR = 0xa1;

unsigned int AddressH = 0x00;
unsigned int AddressL = 0x00;

void ConfigeI2CEEPROM(){

SRbits.IPL = 7;//禁用中断
TRISG = TRISG&0xfeff;
I2CCONbits.I2CEN = 1;//s使能I2C模块
I2CBRG = 0xFA;
}

void PageWrite(){

I2CCONbits.SEN = 1;
while(I2CCONbits.SEN == 1);
I2CTRN = ControlByteW;
while(I2CSTATbits.TRSTAT == 1);
I2CTRN = AddressH;
while(I2CSTATbits.TRSTAT == 1);
I2CTRN = AddressL;
while(I2CSTATbits.TRSTAT == 1);
for(i = 0;i<16;i++){

I2CTRN = WriteTable[i];
while(I2CSTATbits.TRSTAT == 1);
}
I2CCONbits.PEN = 1;
while(I2CSTATbits.TRSTAT == 1);
}

void PageRead(){

I2CCONbits.SEN = 1;
while(I2CCONbits.SEN == 1);
I2CTRN = ControlByteW;
while(I2CSTATbits.TRSTAT == 1);
I2CTRN = AddressH;
while(I2CSTATbits.TRSTAT == 1);
I2CTRN = AddressL;
while(I2CSTATbits.TRSTAT == 1);
I2CCONbits.RSEN = 1;
while(I2CCONbits.RSEN == 1);
I2CTRN = ControlByteR;
while(I2CSTATbits.TRSTAT == 1);
for(i=0;i<16;i++){

I2CCONbits.RCEN = 1;
while(I2CSTATbits.RBF == 0);
ReadTable[i] = I2CRCV;
I2CCONbits.ACKDT = 0;
if(i==15)
I2CCONbits.ACKDT = 1;
I2CCONbits.ACKEN = 1;
while(I2CCONbits.ACKEN == 1);
}
I2CCONbits.PEN = 1;
while(I2CCONbits.PEN == 1);
}
int main(){

ConfigeI2CEEPROM();
PORTGbits.RG8 = 0;
PageWrite();
for(i=0;i<650000;i++);
PageRead();
while(1);
}

//***********************************
// I2CRCV 接收寄存器
// I2CTRN 发送寄存器
// I2CBRG 波特率发生器
// I2CCON 控制寄存器
// I2CSTAT 状态寄存器
// I2CADD 地址寄存器

//************************************
// I2CCON下的重要标志位:
// ACKDT 应答数据位(工作于主控器件模式,适用于主控器件的接受过程),当软件起动应答序列时将发送该值
// ACKEN 应答序列使能位(工作于主控器件,适用于主控器件接受过程).
// RCEN 接收使能位(作为主控器件工作时)
// PEN 停止条件使能位(作为主控器件工作时)
// SEN 起动条件使能位-(起动后序列结束时,由硬件清0)

//************************************
// I2CSTAT下的重要标志位:
// TRSTAT 发送状态位 (1-主控器件正在发送过程中)
// RBF 接收缓冲器满状态位(1-接收完成,I2CRCV满/0-接收未完成,I2CRCV空)

//***********************************

// SI2CIF为从动器件中断,在检测到地址为从动器件地址时激活中断.下列事件会产生SI2CIF中断:

//1.检测到有效器件地址(包括广播呼叫方式的地址)

//2.发送数据的请求

//3.接收到数据