STC89C52單片機(jī)做GPS測速源程序

ID:487236 · 發(fā)表于 2019-8-7 20:58

單片機(jī)源程序如下:

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit EN=P2^7; //LCD使能
sbit RS=P2^6;
sbit KEY=P3^5; //清0鍵
uchar table[]="0123456789:-";
uchar table1[]={"Wait..."}; //
uchar a,b,c,d,i=0,flag;
uchar table0[62];
float S;
uint Speed_dat,Speed_dat1;
uint Total_distance;
uchar num1=0;
uchar time_flag=0;
void delay(uint z)//延時函數(shù)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
/*******************1602液晶***********************/
void write_date(uchar date)//寫數(shù)據(jù)
{ EN=0; RS=1; P0=date; EN=0; delay(5); EN=1;}
void write_com(uchar date)//寫命令
{ EN=0;RS=0;P0=date; EN=0;delay(5); EN=1; }
void init_1602() //LCD初始化
{
uchar num;
write_com(0x38); write_com(0x0c);write_com(0x06);
write_com(0x01); write_com(0x80);
for(num=0;num<7;num++) //顯示“Wait...”
{
write_date(table1[num]);//通過循環(huán)將要顯示的字符注意顯示出來
}
delay(1000); //等待大約3s
}
void display()
{
if(flag==1)
{
flag=0;
if(table0[4]=='M'&&(table0[18]=='A'))//確定是否收到"GPRMC"這一幀數(shù)據(jù) 且是否為有效數(shù)據(jù)
{
if(table0[43]=='E') //
{
if(table0[46]=='.') //<10海里每小時
S=(table0[45]-48)*100+(table0[47]-48)*10+(table0[48]-48);
else if(table0[47]=='.')
S=(table0[45]-48)*1000+(table0[46]-48)*100+(table0[48]-48)*10+(table0[49]-48);
}
Speed_dat=(uint)(S*1.85); //把海里/h轉(zhuǎn)換成km/h
Speed_dat1=(uint)(S*0.514); //把海里/h轉(zhuǎn)換成m/s 計算總里程中用到
if(time_flag==1)
{
time_flag=0;
Total_distance+=(Speed_dat1/100); //每秒刷新一次里程單位m
TR0=1;
}
write_com(0x80); //顯示速度
write_date('S');
write_date('P');
write_date('E');
write_date('E');
write_date('D');
write_date(':');
if(Speed_dat/100<10){write_date(' ');write_date(table[Speed_dat/100]);}
else{write_date(table[Speed_dat/1000]);write_date(table[Speed_dat%1000/100]);}
write_date('.');
write_date(table[Speed_dat%100/10]);
write_date('K'); write_date('m'); write_date('/'); write_date('h');
write_com(0x80+0x40); //顯示里程
write_date('J');write_date('O');write_date('U');write_date('R');
write_date('N');write_date('E');write_date('Y');
write_date(':');
write_date(table[Total_distance/10000]);
write_date(table[Total_distance%10000/1000]);
write_date('.');
write_date(table[Total_distance%10000%1000/100]);
write_date(table[Total_distance%10000%1000%100/10]);
write_date('K'); write_date('m');
}
ES=1; //開串口中斷
}
}
void init()//初始化
{
i=0;
TMOD=0x21; PCON=0x00;
TH1=0xfD; TL1=0xfD; //波特率9600
TH0=(65536-50000)/256; //給定時器高四位賦初值
TL0=(65536-50000)%256; //給定時器第四位賦初值
ET0=1; //打開定時器T1中段
TR0=1; //啟動定時器T0
SM0=0; //串行口方式1
SM1=1;
REN=1; ////允許接收
EA=1; //開中斷
TR1=1; //啟動T1
ES=0; //關(guān)閉串行口中斷
}
void main()
{
init(); //系統(tǒng)初始化
init_1602();//LCD1602初始化
ES=1; //開串行口中斷
while(1)
{
display(); //顯示速度
if(!KEY) //清0鍵按下
{ delay(10);
if(!KEY){Total_distance=0;while(!KEY); }
}
}
}
void time0() interrupt 1 //定時器中斷0
{
TH0=(65536-50000)/256; //給定時器高四位賦初值
TL0=(65536-50000)%256; //給定時器第四位賦初值
num1++;
if(num1==20) //1秒到
{
TR0=0;
num1=0;
time_flag=1;
}
}
void ser() interrupt 4//串口中斷、初次分離'
開頭的字符串，并寫入接收數(shù)組
{
RI=0; table0[i]=SBUF; i++;
if(table0[0]==0x24)//如果是此字符；馬上接收數(shù)據(jù)
{
if(i==62){ i=0;flag=1;ES=0; }
}
else i=0;
}