答案仅供参考，有错误欢迎指正，非常感谢！！！

        文件较多，代码较长，感谢查看！！！

目录

题目分析

main.h

main.c

Init.h

Init.c

SMG.h

SMG.c

DSQ.h

DSQ.c

YanShi.h

YanShi.c

JZKey.h

JZKey.c

onewire.h

onewire.c

iic.h

iic.c

CSB.h

CSB.c

ChuanKou.h

ChuanKou.c

题目分析

        这套题说真滴，是真的恶心，有一说一哈，估计能想出这套题的老师也是真的骚。最后的串口出现的问题，给我整了一天，人直接被整傻了，不过还好都给整出来了。

        这里重点讨论一下接收指令和返回数据的格式。

它题目要求是这样子的：

 我的理解是：“rn”不作转义字符，看到是啥，返回就是啥。还有，这套题我用了3个定时器。

main.h

#ifndef __MAIN_H_
#define __MAIN_H_

#define uchar unsigned char
#define uint unsigned int
	
#include 
#include 
#include 

#include "Init.h"
#include "SMG.h"
#include "DSQ.h"
#include "YanShi.h"
#include "JZKey.h"
#include "onewire.h"
#include "iic.h"
#include "CSB.h"
#include "ChuanKou.h"

void SMG_XianShi();
void LED_XianShi();

#endif

main.c

#include "main.h"

uchar flag2=0;//定时器2标志位
uchar key_num=0;//键值
uchar jie_mian=0;//界面
uchar S13_AnTime_flag=0;//S13按键按下的时间标志位
uchar S12_AnTime_flag=0;//S12按键按下的时间标志位
uchar xian_shi=0;//显示
uchar can_shu=0;//参数
char WenDu_CanShu=30;//温度参数
char JuLi_CanShu=35;//距离参数
uint ci_shu=0;//次数
uchar DAC_KaiQi_flag=1;//DAC输出功能开启标志位
long int S12_KeyTime=0;//按键12按下的时间
long int S13_KeyTime=0;//按键13按下的时间
float wen_du;//温度
int WenDu_XianShi;//显示的温度
int ju_li;//距离
int WenDu_CanShu1=30;//温度参数，确定值
int JuLi_CanShu1=35;//距离参数，确定值
uchar zhi_ling[8];//接收到的指令
uchar i=0;//指令字符串的下标
uchar code ShuJu_ZhiLing[]="ST\r\n";//数据指令
uchar code CanShu_ZhiLing[]="PARA\r\n";//参数指令
uchar ZhiLing_TF=1;//指令的对错判断结果
uchar CSB_CaiJi_flag=100;//超声波采集虚拟中断标志位
uchar ChuanKou_time=0;//串口接收到错误指令的等待时间

void main(){
	uchar j;
	char FanHui_date[15];//向串口返回的数据
	uchar key_num_old;//上一个键值
	Init_BZ();
	SMG_Init();
	ChuanKou_Init();
	DSQ_2_Init();
	JZKey_Init();
	while(1){
		//采集温度
		wen_du=DS18B20_GetWenDu();
		WenDu_XianShi=wen_du*100;
		
		//采集键值
		key_num_old=key_num;
		key_num=JZKey_GetKeynum();
		if(key_num!=key_num_old||S13_AnTime_flag!=0||S12_AnTime_flag!=0){
			if(S13_AnTime_flag==1){//S13按键为短按
				jie_mian++;
				jie_mian=jie_mian%2;
				xian_shi=0;
				can_shu=0;
				S13_AnTime_flag=0;
				if(jie_mian==0){
					if(WenDu_CanShu!=WenDu_CanShu1||JuLi_CanShu!=JuLi_CanShu1){//如果参数发生变化
						ci_shu++;//参数变动次数加l
						IIC_EEPROM_XieDate(10,ci_shu&0x00ff);
						Delay10ms();
						IIC_EEPROM_XieDate(11,ci_shu>>8);
					}
					WenDu_CanShu1=WenDu_CanShu;
					JuLi_CanShu1=JuLi_CanShu;
				}
			}
			else if(S13_AnTime_flag==2){//S13按键为长按
				DAC_KaiQi_flag++;//任何界面状态下，长按S13按键，可切换 DAC输出功能
				DAC_KaiQi_flag=DAC_KaiQi_flag%2;
				S13_AnTime_flag=0;
			}
			else if(S12_AnTime_flag==1){//S12按键为短按
				if(jie_mian){//参数界面
					can_shu++;
					can_shu=can_shu%2;
				}
				else{//数据界面
					xian_shi++;
					xian_shi=xian_shi%3;
				}
				S12_AnTime_flag=0;
			}
			else if(S12_AnTime_flag==2){//S12为长按
				ci_shu=0;//任何界面状态下，长按S12按键，可重置参数变动次数记录为0次。
				S12_AnTime_flag=0;
				IIC_EEPROM_XieDate(10,0);
				Delay10ms();
				IIC_EEPROM_XieDate(11,0);
			}
			else if(key_num==16){//按下S16
				if(jie_mian==1&&can_shu==0){//在温度参数界面下，按下S16，温度参数减少2℃.
					WenDu_CanShu=WenDu_CanShu-2;
					if(WenDu_CanShu<0){
						WenDu_CanShu=WenDu_CanShu+100;
					}
				}
				else if(jie_mian==1&&can_shu==1){//在距离参数界面下，按下S16，距离参数减少5cm
					JuLi_CanShu=JuLi_CanShu-5;
					if(JuLi_CanShu<0){
						JuLi_CanShu=JuLi_CanShu+100;
					}
				}
			}
			else if(key_num==17){//按下S17
				if(jie_mian==1&&can_shu==0){//在温度参数界面下，按下S17，温度参数增加2℃。
					WenDu_CanShu=WenDu_CanShu+2;
					WenDu_CanShu=WenDu_CanShu%100;
				}
				else if(jie_mian==1&&can_shu==1){//在距离参数界面下，接下S17，距离参数增加5cm。
					JuLi_CanShu=JuLi_CanShu+5;
					JuLi_CanShu=JuLi_CanShu%100;
				}
			}
		}
		
		//采集距离
		if(CSB_CaiJi_flag>=100){
			ju_li=CSB_GetJuLi();
			if(DAC_KaiQi_flag){//DAC输出功能启动状态
				if(ju_li<=JuLi_CanShu1){
					IIC_DAC_XieDate(102);
				}
				else{
					IIC_DAC_XieDate(204);
				}
			}
			else{//DAC输出功能关闭状态
				IIC_DAC_XieDate(0.4*51.0);
			}
			CSB_CaiJi_flag=0;
		}
		
		//判断错误的指令
		if(ChuanKou_time>=100){
			ChuanKou_time=0;
			i=0;
			memset(zhi_ling,'',sizeof(zhi_ling));
			ChuanKou_FS_NeiRong("ERROR\r\n");
		}
		
		//指令对比，返回数据
		if(i==6){//判断是否接收到"STrn"或者"PARAr"
			Delay10ms();
			if(i==6){
				ZhiLing_TF=1;
				for(j=0;j0&&i<6)||i==7||i>8){//串口接收到错误的内容，计时
		ChuanKou_time++;
	}
	else{
		ChuanKou_time=0;
	}
	
	if(key_num==12){//按键12被按下，计算按下的时间
		S12_KeyTime++;
	}
	else{
		if(S12_KeyTime>0&&S12_KeyTime<=1000){//S12为短按
			S12_AnTime_flag=1;
		}
		else if(S12_KeyTime>1000){//S12为长按
			S12_AnTime_flag=2;
		}
		S12_KeyTime=0;
	}
	
	if(key_num==13){//按键13被按下，计算按下的时间
		S13_KeyTime++;
	}
	else{
		if(S13_KeyTime>0&&S13_KeyTime<=1000){//S13为短按
			S13_AnTime_flag=1;
		}
		else if(S13_KeyTime>1000){//S13为长按
			S13_AnTime_flag=2;
		}
		S13_KeyTime=0;
	}
	
	if(flag2>=1){
		flag2=0;
		SMG_XianShi();
		LED_XianShi();
	}
}

void ChuanKou_ZD() interrupt 4{
	if(RI==1){
		zhi_ling[i]=SBUF;
		i++;
		RI=0;
	}
}

void SMG_XianShi(){//数码管的界面显示
	if(jie_mian==0){//数据界面
		switch(xian_shi){
			case 0:{//温度数据显示
				if(WenDu_XianShi>=10000){
					SMG_Show(12,16,16,WenDu_XianShi/10000,(WenDu_XianShi/1000)%10,((WenDu_XianShi/100)%10)+32,(WenDu_XianShi/10)%10,WenDu_XianShi%10);
				}
				else if(WenDu_XianShi>=1000){
					SMG_Show(12,16,16,16,WenDu_XianShi/1000,((WenDu_XianShi/100)%10)+32,(WenDu_XianShi/10)%10,WenDu_XianShi%10);
				}
				else if(WenDu_XianShi>=0){
					SMG_Show(12,16,16,16,16,(WenDu_XianShi/100)+32,(WenDu_XianShi/10)%10,WenDu_XianShi%10);
				}
				else if(WenDu_XianShi>-1000){
					SMG_Show(12,16,16,16,17,((-WenDu_XianShi)/100)+32,((-WenDu_XianShi)/10)%10,(-WenDu_XianShi)%10);
				}
				else if(WenDu_XianShi>-10000){
					SMG_Show(12,16,16,17,(-WenDu_XianShi)/1000,(((-WenDu_XianShi)/100)%10)+32,((-WenDu_XianShi)/10)%10,(-WenDu_XianShi)%10);
				}
				break;
			}
			case 1:{//距离数据显示
				SMG_Show(21,16,16,16,16,16,ju_li/10,ju_li%10);
				break;
			}
			case 2:{//变更次数显示
				if(ci_shu>=10000){
					SMG_Show(22,16,16,ci_shu/10000,(ci_shu/1000)%10,(ci_shu/100)%10,(ci_shu/10)%10,ci_shu%10);
				}
				else if(ci_shu>=1000){
					SMG_Show(22,16,16,16,ci_shu/1000,(ci_shu/100)%10,(ci_shu/10)%10,ci_shu%10);
				}
				else if(ci_shu>=100){
					SMG_Show(22,16,16,16,16,ci_shu/100,(ci_shu/10)%10,ci_shu%10);
				}
				else if(ci_shu>=10){
					SMG_Show(22,16,16,16,16,16,ci_shu/10,ci_shu%10);
				}
				else if(ci_shu>=0){
					SMG_Show(22,16,16,16,16,16,16,ci_shu);
				}
				break;
			}
		}
	}
	else{//参数界面
		if(can_shu){//距离参数
			SMG_Show(24,16,16,2,16,16,JuLi_CanShu/10,JuLi_CanShu%10);
		}
		else{//温度参数
			SMG_Show(24,16,16,1,16,16,WenDu_CanShu/10,WenDu_CanShu%10);
		}
	}
}

void LED_XianShi(){//LED显示
	uchar L1=0xff;
	uchar L2=0xff;
	uchar L3=0xff;
	if(wen_du>WenDu_CanShu1){//当温度数据超过温度参数时，指示灯Ll点亮，否则熄灭。
		L1=0xfe;
	}
	else{
		L1=0xff;
	}
	if(ju_li 
Init.h 
#ifndef __INIT_H_
#define __INIT_H_

#include 

void Init_BZ();

#endif
 
Init.c 
#include "Init.h"

void Init_BZ(){
	P2=(P2&0x1f)|0xa0;
	P0=0x00;
	P2=(P2&0x1f)|0x80;
	P0=0xff;
}
 
SMG.h 
#ifndef __SMG_H_
#define __SMG_H_

#include 

void SMG_Init();
void SMG_Show(unsigned char n1,n2,n3,n4,n5,n6,n7,n8);

#endif
 
SMG.c 
#include "SMG.h"

unsigned char code SMG_ZK[]={                       //????
//   0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F
    0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71,
//black  -     H    J    K    L    N    o   P    U     t    G    Q    r   M    y
    0x00,0x40,0x76,0x1E,0x70,0x38,0x37,0x5C,0x73,0x3E,0x78,0x3d,0x67,0x50,0x37,0x6e,
    0xBF,0x86,0xDB,0xCF,0xE6,0xED,0xFD,0x87,0xFF,0xEF,0x46};    //0. 1. 2. 3. 4. 5. 6. 7. 8. 9. -1

void SMG_Init(){
	P2=(P2&0x1f)|0xc0;
	P0=0xff;
	P2=(P2&0x1f)|0xe0;
	P0=0xff;
}

void SMG_Show(unsigned char n1,n2,n3,n4,n5,n6,n7,n8){
	static unsigned char i=0;
	i++;
	i=i%8;
	P2=(P2&0x1f)|0xc0;
	switch(i){
		case 1:{
			P0=0x01;
			P2=(P2&0x1f)|0xe0;
			P0=~SMG_ZK[n1];
			break;
		}
		case 2:{
			P0=0x02;
			P2=(P2&0x1f)|0xe0;
			P0=~SMG_ZK[n2];
			break;
		}
		case 3:{
			P0=0x04;
			P2=(P2&0x1f)|0xe0;
			P0=~SMG_ZK[n3];
			break;
		}
		case 4:{
			P0=0x08;
			P2=(P2&0x1f)|0xe0;
			P0=~SMG_ZK[n4];
			break;
		}
		case 5:{
			P0=0x10;
			P2=(P2&0x1f)|0xe0;
			P0=~SMG_ZK[n5];
			break;
		}
		case 6:{
			P0=0x20;
			P2=(P2&0x1f)|0xe0;
			P0=~SMG_ZK[n6];
			break;
		}
		case 7:{
			P0=0x40;
			P2=(P2&0x1f)|0xe0;
			P0=~SMG_ZK[n7];
			break;
		}
		case 0:{
			P0=0x80;
			P2=(P2&0x1f)|0xe0;
			P0=~SMG_ZK[n8];
			break;
		}
	}
	P2=(P2&0x1f)|0x00;
}
 
DSQ.h 
#ifndef __DSQ_H_
#define __DSQ_H_

#include 

void DSQ_2_Init();

#endif
 
DSQ.c 
#include "DSQ.h"

void DSQ_2_Init(){
	AUXR |= 0x04;		//定时器时钟1T模式
	T2L = 0x20;		//设置定时初值
	T2H = 0xD1;		//设置定时初值
	AUXR |= 0x10;		//定时器2开始计时
	EA=1;
	IE2=0x04;//允许定时器2中断
}
 
YanShi.h 
#ifndef __YANSHI_H_
#define __YANSHI_H_

#include 
#include "intrins.h"

void Delay10ms();

#endif
 
YanShi.c 
#include "YanShi.h"

void Delay10ms()		//@12.000MHz
{
	unsigned char i, j;

	i = 117;
	j = 184;
	do
	{
		while (--j);
	} while (--i);
}
 
JZKey.h 
#ifndef __JZKEY_H_
#define __JZKEY_H_

#include "YanShi.h"

void JZKey_Init();
unsigned char JZKey_GetKeynum();

#endif
 
JZKey.c 
#include "JZKey.h"

void JZKey_Init(){
	P30=1;
	P31=1;
	P32=1;
	P33=1;
	P34=0;
	P35=0;
	P42=0;
	P44=0;
}

unsigned char JZKey_GetKeynum(){
	unsigned char key_num=0;
	if(P30==0){
		P30=0;
		P34=1;
		P35=1;
		P42=1;
		P44=1;
		if(P34==0){
			Delay10ms();
			if(P34==0){
				key_num=19;
			}
		}
		else if(P35==0){
			Delay10ms();
			if(P35==0){
				key_num=15;
			}
		}
		else if(P42==0){
			Delay10ms();
			if(P42==0){
				key_num=11;
			}
		}
		else if(P44==0){
			Delay10ms();
			if(P44==0){
				key_num=7;
			}
		}
	}
	else if(P31==0){
		P31=0;
		P34=1;
		P35=1;
		P42=1;
		P44=1;
		if(P34==0){
			Delay10ms();
			if(P34==0){
				key_num=18;
			}
		}
		else if(P35==0){
			Delay10ms();
			if(P35==0){
				key_num=14;
			}
		}
		else if(P42==0){
			Delay10ms();
			if(P42==0){
				key_num=10;
			}
		}
		else if(P44==0){
			Delay10ms();
			if(P44==0){
				key_num=6;
			}
		}
	}
	else if(P32==0){
		P32=0;
		P34=1;
		P35=1;
		P42=1;
		P44=1;
		if(P34==0){
			Delay10ms();
			if(P34==0){
				key_num=17;
			}
		}
		else if(P35==0){
			Delay10ms();
			if(P35==0){
				key_num=13;
			}
		}
		else if(P42==0){
			Delay10ms();
			if(P42==0){
				key_num=9;
			}
		}
		else if(P44==0){
			Delay10ms();
			if(P44==0){
				key_num=5;
			}
		}
	}
	else if(P33==0){
		P33=0;
		P34=1;
		P35=1;
		P42=1;
		P44=1;
		if(P34==0){
			Delay10ms();
			if(P34==0){
				key_num=16;
			}
		}
		else if(P35==0){
			Delay10ms();
			if(P35==0){
				key_num=12;
			}
		}
		else if(P42==0){
			Delay10ms();
			if(P42==0){
				key_num=8;
			}
		}
		else if(P44==0){
			Delay10ms();
			if(P44==0){
				key_num=4;
			}
		}
	}
	JZKey_Init();
	return key_num;
}
 
onewire.h 
#ifndef __ONEWIRE_H
#define __ONEWIRE_H

#include 

sbit DQ = P1^4;  

unsigned char rd_temperature(void);  
float DS18B20_GetWenDu();

#endif
 
onewire.c 
#include "onewire.h"

//单总线内部延时函数
void Delay_OneWire(unsigned int t)  
{
	unsigned char i;
	while(t--){
		for(i=0;i<12;i++);
	}
}

//单总线写操作
void Write_DS18B20(unsigned char dat)
{
	unsigned char i;
	for(i=0;i<8;i++)
	{
		DQ = 0;
		DQ = dat&0x01;
		Delay_OneWire(5);
		DQ = 1;
		dat >>= 1;
	}
	Delay_OneWire(5);
}

//单总线读操作
unsigned char Read_DS18B20(void)
{
	unsigned char i;
	unsigned char dat;
  
	for(i=0;i<8;i++)
	{
		DQ = 0;
		dat >>= 1;
		DQ = 1;
		if(DQ)
		{
			dat |= 0x80;
		}	    
		Delay_OneWire(5);
	}
	return dat;
}

//DS18B20初始化
bit init_ds18b20(void)
{
  	bit initflag = 0;
  	
  	DQ = 1;
  	Delay_OneWire(12);
  	DQ = 0;
  	Delay_OneWire(80);
  	DQ = 1;
  	Delay_OneWire(10); 
    initflag = DQ;     
  	Delay_OneWire(5);
  
  	return initflag;
}

float DS18B20_GetWenDu(){
	float wen_du,zheng_shu,xiao_shu;
	unsigned char di,gao;
	init_ds18b20();
	Write_DS18B20(0xcc);
	Write_DS18B20(0x44);
	Delay_OneWire(200);
	
	init_ds18b20();
	IE2=0x00;
	Write_DS18B20(0xcc);
	Write_DS18B20(0xbe);
	di=Read_DS18B20();
	gao=Read_DS18B20();
	IE2=0x04;
	if(gao>=248){
		gao=~gao;
		di=~di;
		if(di==0xff){
			di=0;
			gao++;
		}
		else{
			di++;
		}
		zheng_shu=((gao<<4)|(di>>4))*1.0;
		xiao_shu=(di&0x0f)*0.0625;
		wen_du=-(zheng_shu+xiao_shu);
	}
	else{
		zheng_shu=((gao<<4)|(di>>4))*1.0;
		xiao_shu=(di&0x0f)*0.0625;
		wen_du=(zheng_shu+xiao_shu);
	}
	return wen_du;
}
 
iic.h 
#ifndef _IIC_H
#define _IIC_H

#include 
#include "intrins.h"

sbit SDA = P2^1;
sbit SCL = P2^0;

void IIC_Start(void); 
void IIC_Stop(void);  
bit IIC_WaitAck(void);  
void IIC_SendAck(bit ackbit); 
void IIC_SendByte(unsigned char byt); 
unsigned char IIC_RecByte(void); 

unsigned char IIC_ADC_GetDate(unsigned char di_zhi);
void IIC_DAC_XieDate(unsigned char date);
void IIC_EEPROM_XieDate(unsigned char di_zhi,unsigned char date);
unsigned char IIC_EEPROM_GetDate(unsigned char di_zhi);

#endif
 
iic.c 
#include "iic.h"

#define DELAY_TIME 5

//I2C总线内部延时函数
void IIC_Delay(unsigned char i)
{
    do{_nop_();}
    while(i--);        
}

//I2C总线启动信号
void IIC_Start(void)
{
    SDA = 1;
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SDA = 0;
    IIC_Delay(DELAY_TIME);
    SCL = 0;	
}

//I2C总线停止信号
void IIC_Stop(void)
{
    SDA = 0;
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SDA = 1;
    IIC_Delay(DELAY_TIME);
}

//发送应答或非应答信号
void IIC_SendAck(bit ackbit)
{
    SCL = 0;
    SDA = ackbit;  					
    IIC_Delay(DELAY_TIME);
    SCL = 1;
    IIC_Delay(DELAY_TIME);
    SCL = 0; 
    SDA = 1;
    IIC_Delay(DELAY_TIME);
}

//等待应答
bit IIC_WaitAck(void)
{
    bit ackbit;
	
    SCL  = 1;
    IIC_Delay(DELAY_TIME);
    ackbit = SDA;
    SCL = 0;
    IIC_Delay(DELAY_TIME);
    return ackbit;
}

//I2C总线发送一个字节数据
void IIC_SendByte(unsigned char byt)
{
    unsigned char i;

    for(i=0; i<8; i++)
    {
        SCL  = 0;
        IIC_Delay(DELAY_TIME);
        if(byt & 0x80) SDA  = 1;
        else SDA  = 0;
        IIC_Delay(DELAY_TIME);
        SCL = 1;
        byt <<= 1;
        IIC_Delay(DELAY_TIME);
    }
    SCL  = 0;  
}

//I2C总线接收一个字节数据
unsigned char IIC_RecByte(void)
{
    unsigned char i, da;
    for(i=0; i<8; i++)
    {   
    	SCL = 1;
	IIC_Delay(DELAY_TIME);
	da <<= 1;
	if(SDA) da |= 1;
	SCL = 0;
	IIC_Delay(DELAY_TIME);
    }
    return da;    
}

unsigned char IIC_ADC_GetDate(unsigned char di_zhi){
	unsigned char date;
	IIC_Start();
	IIC_SendByte(0x90);
	IIC_WaitAck();
	IIC_SendByte(di_zhi);
	IIC_WaitAck();
	IIC_Stop();
	
	IIC_Start();
	IIC_SendByte(0x91);
	IIC_WaitAck();
	date=IIC_RecByte();
	IIC_SendAck(1);
	IIC_WaitAck();
	IIC_Stop();
	return date;
}

void IIC_DAC_XieDate(unsigned char date){
	IIC_Start();
	IIC_SendByte(0x90);
	IIC_WaitAck();
	IIC_SendByte(0x40);
	IIC_WaitAck();
	IIC_SendByte(date);
	IIC_WaitAck();
	IIC_Stop();
}

void IIC_EEPROM_XieDate(unsigned char di_zhi,unsigned char date){
	IIC_Start();
	IIC_SendByte(0xa0);
	IIC_WaitAck();
	IIC_SendByte(di_zhi);
	IIC_WaitAck();
	IIC_SendByte(date);
	IIC_WaitAck();
	IIC_Stop();
}

unsigned char IIC_EEPROM_GetDate(unsigned char di_zhi){
	unsigned char date;
	IIC_Start();
	IIC_SendByte(0xa0);
	IIC_WaitAck();
	IIC_SendByte(di_zhi);
	IIC_WaitAck();
	IIC_Stop();
	
	IIC_Start();
	IIC_SendByte(0xa1);
	IIC_WaitAck();
	date=IIC_RecByte();
	IIC_SendAck(1);
	IIC_WaitAck();
	IIC_Stop();
	return date;
}
 
CSB.h 
#ifndef __CSB_H_
#define __CSB_H_

#define FS P10
#define JS P11

#include 
#include "intrins.h"

void Delay13us();
void CSB_FS_MC();
float CSB_GetJuLi();

#endif
 
CSB.c 
#include "CSB.h"

void Delay13us()		//@12.000MHz
{
	unsigned char i;

	_nop_();
	_nop_();
	i = 36;
	while (--i);
}

void CSB_FS_MC(){
	unsigned char i=8;
	while(i>0){
		i--;
		FS=1;
		Delay13us();
		FS=0;
		Delay13us();
	}
}

float CSB_GetJuLi(){
	float ju_li;
	unsigned int time;
	
	AUXR |= 0x80;		//定时器时钟1T模式
	TMOD &= 0xF0;		//设置定时器模式
	TL0 = 0;		//设置定时初值
	TH0 = 0;		//设置定时初值
	ET0=0;
	
	TF0 = 0;		//清除TF0标志
	CSB_FS_MC();
	TR0=1;
	while(JS==1&&TF0==0);
	TR0=0;
	if(JS==0&&TF0==0){
		time=((unsigned int)TH0<<8)|(unsigned int)TL0;
		ju_li=(time*1.0*0.017)/12.0;
	}
	else{
		TF0=0;
		ju_li=99;
	}
	TH0=0;
	TL0=0;
	
	return ju_li;
}
 
ChuanKou.h 
#ifndef __CHUANKOU_H_
#define __CHUANKOU_H_

#include 

void ChuanKou_Init();
void ChuanKou_FS_Date(unsigned char date);
void ChuanKou_FS_NeiRong(unsigned char *s);

#endif
 
ChuanKou.c 
#include "ChuanKou.h"

void ChuanKou_Init(){
	SCON = 0x50;		//8位数据,可变波特率
	AUXR |= 0x40;		//定时器1时钟为Fosc,即1T
	AUXR &= 0xFE;		//串口1选择定时器1为波特率发生器
	TMOD &= 0x0F;		//设定定时器1为16位自动重装方式
	TL1 = 0x8F;		//设定定时初值
	TH1 = 0xFD;		//设定定时初值
	ET1 = 0;		//禁止定时器1中断
	TR1 = 1;		//启动定时器1
	ES=1;
	EA=1;
}

void ChuanKou_FS_Date(unsigned char date){
	SBUF=date;
	while(TI==0);
	TI=0;
}

void ChuanKou_FS_NeiRong(unsigned char *s){
	while(*s!=''){
		ChuanKou_FS_Date(*s++);
	}
}