3個(gè)atmega16之間的（TWI互相通信）+（中斷形式仿真）

//1號(hào)主機(jī):
#include

#include
#include
#include

#defineucharunsigned char
#defineSTATUS(TWSR&0xf8)
#defineSLA_W0x32
#defineSLA_R0x33
#defineSLAVER_ADDRESS0x32
#defineSTART0x08
#defineRE_START0x10
#defineMT_SLA_WRITE_ACK0x18
#defineMT_SLA_READ_ACK0x40
#defineMT_DATA_ACK0x28
#defineMT_READ_ACK0x58

void Start(void)
{
TWCR=(1<while(!(TWCR&(1<}
void Stop(void)
{
TWCR=(1<}
void Load(uchar i)
{
TWDR=i;
TWCR=(1<while(!(TWCR&(1<}
void Get(unsigned char *d)
{
TWCR=(1<while(!(TWCR&(1<*d= TWDR;
}
void ERROR(uchar state)
{Stop();
}

uchar SendByte(uchar k,uchar data)
{
//啟動(dòng)I2C
Start();
if(STATUS!=START) //{ERROR(STATUS);return 0;}
puts("Start ERRor");
//發(fā)送從機(jī)地址（寫(xiě)），等待回應(yīng)， 錯(cuò)誤檢測(cè)
Load(k);
if(STATUS!=MT_SLA_WRITE_ACK) //{ERROR(STATUS);return 0;}
puts("SLA_W RROR");

//發(fā)送數(shù)據(jù)，等待回應(yīng)，錯(cuò)誤檢測(cè)
Load(data);
if(STATUS!=MT_DATA_ACK) //{ERROR(STATUS);return 0;}
puts("Date Error");
Stop();
return 1;//發(fā)送成功，返回1；

}
void Init_Io(void)
{
DDRC&=~((1<PORTC|= (1<// TWCR=(1<TWAR=0x04; //| (1<TWCR=(1<TWBR=32;//波特率 100K8M晶振
sei();
}
void Init_cj(void)
{
DDRC&=~((1<PORTC|= (1<//TWI接口初始化,從器件模式
TWAR=0x04; //| (1<TWCR=(1<sei();
}

void main()
{
uchar temp=0;
Init_Io();
SendByte(0x06,0xf3);
(TWCR = (1<_delay_ms(50);
SendByte(0x08,0xff);
while(1);

}

SIGNAL(SIG_2WIRE_SERIAL)

{
uchar temp1,temp2;
temp1=STATUS;
temp2=TWDR;
if(temp1==0x80)
{
DDRA=0xff;
PORTA=temp2;
//DDRA=0xff;
//lcd(10,0,"ri");
// lcdnum(0,1,temp2);
}
TWCR=(1<

}

//2號(hào)從機(jī)

#include
#include
#include
#define uchar unsigned char
#define STATUS (TWSR&0xf8)
#define SLA_W0x32
#define SLA_R0x33
#define TWI_ADDRESS0x32
#define START0x08
#define RE_START0x10
#define MT_SLA_WRITE_ACK0x18
#define MT_SLA_READ_ACK0x40
#define MT_DATA_ACK0x28
#define MT_READ_ACK0x58
#define TW_SR_DATA_ACK0x80
void Start(void)
{
TWCR=(1<while(!(TWCR&(1<}
void Stop(void)
{
TWCR=(1<}
void Load(uchar i)
{
TWDR=i;
TWCR=(1<while(!(TWCR&(1<}
void Get(unsigned char *d)
{
TWCR=(1<while(!(TWCR&(1<*d= TWDR;
}
void ERROR(uchar state)
{Stop();
}

uchar WriteByte(uchar data)
{
//啟動(dòng)I2C
Start();
if(STATUS!=START) {ERROR(STATUS);return 0;}

//發(fā)送從機(jī)地址（寫(xiě)），等待回應(yīng)， 錯(cuò)誤檢測(cè)
Load(SLA_W);
if(STATUS!=MT_SLA_WRITE_ACK) {ERROR(STATUS);return 0;}

//發(fā)送數(shù)據(jù)，等待回應(yīng)，錯(cuò)誤檢測(cè)
Load(data);
if(STATUS!=MT_DATA_ACK) {ERROR(STATUS);return 0;}

Stop();
return 1;//發(fā)送成功，返回1；


}
unsigned char ReadByte(unsigned char addr,
unsigned char *p_data)
{
//啟動(dòng)I2C
Start();
if(STATUS!=START) {ERROR(STATUS);return 0;}

//發(fā)送從機(jī)地址（寫(xiě)），等待回應(yīng)， 錯(cuò)誤檢測(cè)
Load(SLA_W);
if(STATUS!=MT_SLA_WRITE_ACK) {ERROR(STATUS);return 0;}
//發(fā)送EEPROM地址，等待回應(yīng)，錯(cuò)誤檢測(cè)
Load(addr);
if(STATUS!=MT_DATA_ACK) {ERROR(STATUS);return 0;}
//再次啟動(dòng)I2C
Start();
if(STATUS!=RE_START) {ERROR(STATUS);return 0;}
//發(fā)送從機(jī)地址(讀)，等待回應(yīng)， 錯(cuò)誤檢測(cè)
Load(SLA_R);
if(STATUS!=MT_SLA_READ_ACK) {ERROR(STATUS);return 0;}
//讀取I2C數(shù)據(jù)
Get(p_data);
if(STATUS!=MT_READ_ACK) {ERROR(STATUS);return 0;}
//發(fā)送Stop，結(jié)束讀I2C操作。
Stop();
return 1;


}
void Init_Io(void)
{
DDRC&=~((1<PORTC|= (1<//TWI接口初始化,從器件模式
TWAR=0x06; //| (1<TWCR=(1<sei();
}
void main()
{
// uchar temp1,temp2;
Init_Io();
//startlcd();
//lcd(0,0,"nimabi");
_delay_ms(30);
DDRD=0xff;
PORTD=0xff;

while(1)
{
}
}
SIGNAL(SIG_2WIRE_SERIAL)
{
uchar temp1,temp2;
temp1=STATUS;
temp2=TWDR;
if(temp1==0x80)
{
DDRA=0xff;
PORTA=temp2;
DDRA=0xff;
//lcd(10,0,"ri");
// lcdnum(0,1,temp2);
}
TWCR=(1<}

//3號(hào)從機(jī)

#include
#include

#include

#define uchar unsigned char
#define STATUS (TWSR&0xf8)
#define SLA_W0x32
#define SLA_R0x33
#define TWI_ADDRESS0x32
#define START0x08
#define RE_START0x10
#define MT_SLA_WRITE_ACK0x18
#define MT_SLA_READ_ACK0x40
#define MT_DATA_ACK0x28
#define MT_READ_ACK0x58
#define TW_SR_DATA_ACK0x80

void Start(void)
{
TWCR=(1<while(!(TWCR&(1<}
void Stop(void)
{
TWCR=(1<}
void Load(uchar i)
{
TWDR=i;
TWCR=(1<while(!(TWCR&(1<

}

void Get(unsigned char *d)
{
TWCR=(1<while(!(TWCR&(1<*d= TWDR;
}
void ERROR(uchar state)
{Stop();
}

uchar SendByte(uchar k,uchar data)
{
//啟動(dòng)I2C
Start();
if(STATUS!=START) //{ERROR(STATUS);return 0;}
puts("Start ERRor");
//發(fā)送從機(jī)地址（寫(xiě)），等待回應(yīng)， 錯(cuò)誤檢測(cè)
Load(k);
if(STATUS!=MT_SLA_WRITE_ACK) //{ERROR(STATUS);return 0;}
puts("SLA_W RROR");

//發(fā)送數(shù)據(jù)，等待回應(yīng)，錯(cuò)誤檢測(cè)
Load(data);
if(STATUS!=MT_DATA_ACK) //{ERROR(STATUS);return 0;}
puts("Date Error");
Stop();
return 1;//發(fā)送成功，返回1；

}

unsigned char ReadByte(unsigned char addr,
unsigned char *p_data)
{
//啟動(dòng)I2C
Start();
if(STATUS!=START) {ERROR(STATUS);return 0;}

//發(fā)送從機(jī)地址（寫(xiě)），等待回應(yīng)， 錯(cuò)誤檢測(cè)
Load(SLA_W);
if(STATUS!=MT_SLA_WRITE_ACK) {ERROR(STATUS);return 0;}