#include "msp430x13x.h"
?? ??
void nop(void)
{
? _NOP();
? _NOP();
? _NOP();
}

void start(void)?? ??
{
? SCLEN &= (~(SDA+SCL));?
? _NOP();
? _NOP();
? _NOP();?
? SDAEN |= SDA; ??
? SCLEN |= SCL;??? ??
? return;
}
void stop(void)
{
? SDAEN |= SDA;???????? ?
? SCLEN &= (~SCL);??
? SDAEN &= (~SDA);??
? return;
}

unsigned char ControlByte(int AddressByte)
{
? unsigned char temp;

? _BIC_SR(0X0001);??//CLEAR SR 'C'
? temp = (char)(AddressByte>>8);
? temp <<= 1 ;
? temp &= 0X0E;
? temp += Code;
? return temp;
}

int shout( unsigned char data )?
{
?unsigned char mask,i,temp;
?unsigned char Value;

?Value = data;
?mask=0X80;

?for (i=0;i<=7;i++){

????? temp = (Value & mask);???????
????? if( temp !=0 ){??
????????? SDAEN &=? (~SDA);?
????????? SCLEN &=? (~SCL);?
???????? if( !( SDAIN & SDA ) ){
??????????? return 1;
????????? }
????? }
????? else {
??????? SDAEN |= SDA ; ??
??????? SCLEN &= (~SCL);?
????? }
???
??? mask>>=1;

??? SCLEN |= SCL; ???
?}
? SDAEN &= (~SDA);
? SCLEN &= (~SCL);

? if ( !(SDAIN & SDA )){
???? // return 1;
? }
?
? SCLEN |= SCL;
? return 0;
}

// 寫 Number 個(gè)字節(jié)到 E2 中
int WriteBlock(int number,unsigned char *dataadr,unsigned char *e2adr)
{
? unsigned char *p1;
? int i;
? unsigned char temp;
? unsigned int aaa;
? //unsigned char *temp1;
?
? _DINT();???
? SDADAT &= (~(SCL+SDA));?
? ????
? start();?????????????????????

? aaa = (int)(e2adr );
? temp = ControlByte(aaa);
? shout(temp);

? shout( (int)(e2adr));

? p1 = dataadr;

? for (i=1;i<=8;i++) {

???? shout(*p1);
???? p1++;
? }
? stop();?
? _EINT();?
?
//Write a block use the address and back..
?return 0;????????? ???//if error return 1? right return 0
}
// 寫N * 8個(gè)字節(jié)
int WriteN8Byte(int Number)
{
? unsigned char *e2adr,*dataadr;
? unsigned int i,j;

//int WriteBlock(int number,unsigned char *dataadr,unsigned char *e2adr)
? dataadr = (char*)0x200;
? e2adr = (char*)0x00;

? for( i=1;i<=Number;i++){
?
??? WriteBlock(8,dataadr,e2adr);
??? dataadr += 8;?
??? e2adr += 8;???
??? for (j=0;j<=3333;j++);???????????
???
? }

? return 0;
}

//; Clock out an acknowledge bit (low).
//; SCL expected low on entry. Return with SCL, SDA low.
void Ack(void)
{
? SDAEN |= SDA;
? SCLEN &= ~SCL;
? SCLEN |= SCL;
?
}
//; Clock out a negative acknowledge bit (high).
//; SCL expected low on entry. Return with SCL low, SDA high.
void Nak(void)
{
? SDAEN &= ~SDA;??????????????????? //; NAK bit
? SCLEN &= ~SCL;??????????????????? //; raise clock
? SCLEN |= SCL;???????????????????? //; drop clock

}
//由E2 中 讀8位 一個(gè)字節(jié) 數(shù)據(jù)
unsigned char shin(void)
{
? int i;
? unsigned char temp;
? unsigned char Mask;

? SDAEN &= ~SDA;????????????????? // make SDA an input
? temp =0;

//讀8位數(shù)據(jù)
? for( i=1;i<=8;i++) {
???
??? SCLEN &= ~SCL;??????????????? //SCL = H
??? Mask = 0;

??? if (SDAIN &SDA)
????? Mask = 1;
??? else
????? Mask =0;
//??? Mask = SDAIN & SDA;
??? Mask <<= (8 - i);
??? temp ^= Mask;
??? SCLEN |= SCL;???
? }

? return temp;
?}
// 24c256 512 頁 64字節(jié) 14-15bit Word Address!!!
//**********************************************************************
//? 讀取N 個(gè)字節(jié) 到RAM 中
//? 參數(shù)說明： number 讀取的個(gè)數(shù)，dataadr,讀到RAM 的地址?e2adr,E2地址
//**********************************************************************
int? ReadNByte(int number,unsigned char *dataadr,unsigned char *e2adr)
{
?int? i;?????????????
?unsigned char *p;?
?unsigned char temp;?????????????
?unsigned char temp1;
?
? _DINT(); ??
?SDADAT &= (~(SCL+SDA));
?
?p=dataadr;???

?start();???

? temp = ControlByte((int)(e2adr ));
? shout(temp);????
?
? shout((int)(e2adr ));????????

? start();

? temp |= 0X01;??????????
? shout(temp);?????????

? temp1=0;
? for (i=1;i<=number;i++){??????????????
??? temp1 = shin();
??? *p++ = temp1;

??? Ack();
? }
?Nak();
?stop();
?_EINT();

?return 0;
}