基于51单片机的GPS系统,显示经纬度,由于gps是无法仿真的硬件 所以只能用串口来模拟
仿真原理图如下(proteus仿真工程文件可到本帖附件中下载)
单片机源程序如下:
- /*************************************
- GPS解码显示程序,
- ***************************************/
- #include<reg52.h>
- #include "1602.h"
- //#include"math.h"
- //#include <stdlib.h>
- sbit GPS_SPD=P1^1; //GPS模块速率设置
- sbit KEY1=P1^0; //显示内容分屏切换,(T0,T1引脚 的第二功能为计数器。)
- char code TIME_AREA= 8; //时区
- /***************************************
- 这是做的部分更改
- ************************************/
- unsigned long maxspeed,b;
- unsigned int count=0;
- unsigned int a[5];
- unsigned char hspeed[5];
- unsigned int dot_count; //小数点计数器
- //unsigned char x;
- //GPS数据存储数组
- unsigned char JD[10]; //经度
- unsigned char JD_a; //经度方向
- unsigned char WD[9]; //纬度
- unsigned char WD_a; //纬度方向
- unsigned char date[6]; //日期
- unsigned char time[6]; //时间
- unsigned char speed[5]={'0','0','0','.','0'}; //速度
- unsigned char high[6]; //高度
- unsigned char angle[5]={'0','0','0','0','0'}; //方位角
- unsigned char use_sat[2]; //使用的卫星数
- unsigned char total_sat[2]; //天空中总卫星数
- unsigned char lock; //定位状态
- //串口中断需要的变量
- unsigned char seg_count; //逗号计数器
- unsigned char byte_count; //位数计数器
- unsigned char cmd_number; //命令类型
- unsigned char mode; //0:结束模式,1:命令模式,2:数据模式
- unsigned char buf_full; //1:整句接收完成,相应数据有效。0:缓存数据无效。
- unsigned char cmd[5]; //命令类型存储数组
- //显示需要的变量
- unsigned int dsp_count; //刷新次数计数器
- //unsigned char time_count;
- bit page;
- void sys_init(void);
- bit chk_key(void);
- main()
- {
- unsigned char i;
- char Bhour;
- sys_init();
- lock=1;
- use_sat[0]='0';
- use_sat[1]='0';
- total_sat[0]='0';
- total_sat[1]='0';
- while(1){
- if(buf_full==0) //无GPS信号时
- {
- dsp_count++;
- if(dsp_count>=65000){
- LCD_cls(); //清屏
- LCD_write_string(0,0,"No GPS connect..");
- LCD_write_string(0,1,"Please Check..");
- while(buf_full==0);
- LCD_cls();
- dsp_count=0;
- }
- }
- else{ //有GPS信号时
- /*************************************
- 最大速度处理
- *************************************/
- dot_count=0;
- b=0;
- for(i=0;i<5;i++)
- {
- if(speed[i]!='.')
- dot_count++;
- else
- break ;
- }
- switch(dot_count)
- {
-
- case 1:
- b=((speed[0]-'0')*10+(speed[2]-'0'))*1.852;
- break;
- case 2:
- b=((speed[0]-'0')*100+(speed[1]-'0')*10+(speed[4]-'0'))*1.852;
- break;
- case 3:
- b=((speed[0]-'0')*1000+(speed[1]-'0')*100+(speed[2]-'0')*10+(speed[4]-'0'))*1.852;
- break;
-
- }
- if(b>maxspeed)
- {
- maxspeed=b;
- }
- /*************************************
- 最大速度处理
- *************************************/
-
- if(chk_key()){ //检测到按键切换显示
- page=!page;
- LCD_cls();
- }
- if(!page){ //页面1
-
- if(buf_full|0x01){ //GGA语句
- if(lock==0){ //如果未定位
- LCD_write_string(0,0,"*---.--.---- ");
- LCD_write_string(0,1,"* --.--.---- ");
- }else{ //如果已定位
-
- LCD_write_char(0,0,JD_a); //显示经度
- for(i=0;i<3;i++)
- {
- LCD_write_char(i+1,0,JD[i]);
- }
- LCD_write_char(4,0,'.');
- for(i=3;i<10;i++)
- {
- LCD_write_char(i+2,0,JD[i]);
- }
- LCD_write_char(0,1,WD_a); //显示纬度
- LCD_write_char(1,1,' ');
- for(i=0;i<2;i++)
- {
- LCD_write_char(i+2,1,WD[i]);
- }
- LCD_write_char(4,1,'.');
- for(i=2;i<9;i++)
- {
- LCD_write_char(i+3,1,WD[i]);
- }
-
- }
- LCD_write_char(14,1,use_sat[0]); //显示接收卫星数
- LCD_write_char(15,1,use_sat[1]);
- buf_full&=~0x01;
- dsp_count=0;
- }
- if(buf_full|0x02){ //GSV语句
- LCD_write_char(14,1,total_sat[0]);
- LCD_write_char(15,1,total_sat[1]);
- buf_full&=~0x02;
- dsp_count=0;
- }
- if(buf_full|0x04){
- if(lock==0){ //如果未定位
- LCD_write_string(0,0,"*---.--.---- ");
- LCD_write_string(0,1,"* --.--.---- ");
- }else{ //如果已定位
- LCD_write_char(0,0,JD_a); //显示经度
- for(i=0;i<3;i++)
- {
- LCD_write_char(i+1,0,JD[i]);
- }
- LCD_write_char(4,0,'.');
- for(i=3;i<10;i++)
- {
- LCD_write_char(i+2,0,JD[i]);
- }
- LCD_write_char(0,1,WD_a); //显示纬度
-
- LCD_write_char(1,1,' ');
- for(i=0;i<2;i++)
- {
- LCD_write_char(i+2,1,WD[i]);
- }
- LCD_write_char(4,1,'.');
- for(i=2;i<9;i++)
- {
- LCD_write_char(i+3,1,WD[i]);
- }
- }
- LCD_write_char(14,0,use_sat[0]); //显示接收卫星数
- LCD_write_char(15,0,use_sat[1]);
- buf_full&=~0x04;
- dsp_count=0;
- }
- }
- else{ //页面2
- if(buf_full|0x01){ //GGA语句
- buf_full&=~0x01;
- dsp_count=0;
- }
- if(buf_full|0x02){
- buf_full&=~0x02;
- dsp_count=0;
- }
- if(buf_full|0x04){ //RMC语句
- Bhour=((time[0]-0x30)*10+time[1]-0x30)+TIME_AREA;
- if(Bhour>=24){
- Bhour-=24;
- }else if(Bhour<0){
- Bhour+=24;
- }
- LCD_write_char(0,1,date[4]);
- LCD_write_char(1,1,date[5]);
- LCD_write_char(2,1,date[2]);
- LCD_write_char(3,1,date[3]);
- LCD_write_char(4,1,date[0]);
- LCD_write_char(5,1,date[1]);
- LCD_write_char(8,1,Bhour/10+0x30);
- LCD_write_char(9,1,Bhour%10+0x30);
- LCD_write_char(10,1,':');
- LCD_write_char(11,1,time[2]);
- LCD_write_char(12,1,time[3]);
- LCD_write_char(13,1,':');
- LCD_write_char(14,1,time[4]);
- LCD_write_char(15,1,time[5]);
- LCD_write_string(5,0,"knot A");
- if(lock=='0'){ //如果未定位
- LCD_write_string(0,0,"---.-");
- LCD_write_string(11,0,"---.-");
- }else{ //已经定位,在此处做的改动。
- /*******************************************************************************/
-
-
- if(count<10)
- {
-
- for(i=0;i<5;i++)
- {
- LCD_write_char(i,0,speed[i]);//knot显示
- }
- count++;
- }
- else
- {
- if(count>15)
- {
- count=0;
- }
- hspeed[0]=maxspeed/1000+0x30; //把小数转成字符数组
- hspeed[1]=(maxspeed/100)%10+0x30;
- hspeed[2]=(maxspeed/10)%10+0x30;
- hspeed[3]='.';
- hspeed[4]= maxspeed%10+0x30;
-
- count++;
- LCD_write_string(5,0,"Km/h A");
- LCD_write_char(0,0,hspeed[0]);
- LCD_write_char(1,0,hspeed[1]);
- LCD_write_char(2,0,hspeed[2]);
- LCD_write_char(3,0,hspeed[3]);
- LCD_write_char(4,0,hspeed[4]); //最大速度显 */
- }
-
- /*******************************************************************************/
- for(i=0;i<5;i++){
- LCD_write_char(11+i,0,angle[i]);
- }
- }
- buf_full&=~0x04;
- dsp_count=0;
- }
- }
- }
- }
- }
- bit chk_key(void)
- {
- if(!KEY1){
- delayms(10);
- if(!KEY1){
- while(!KEY1);
- delayms(10);
- return(1);
- }
- }
- LCD_cls(); //清屏
- return(0);
- }
- //系统初始化
- void sys_init() {
- unsigned char i;
- SCON = 0x50; /* SCON: mode 1, 8-bit UART, enable rcvr */
- TMOD = 0x21; /* TMOD: timer 1, mode 2, 8-bit reload */
- if(GPS_SPD){
- TH1 = 0xfa; /* TH1: reload value for 9600 baud @ 11.059MHz */
- }else{
- TH1 = 0xfd; /* TH1: reload value for 4800 baud @ 11.059MHz */
- }
- TR1 = 1; /* TR1: timer 1 run */
- LCD_init(8); //初始化LCD
- LCD_write_string(0,0," GPS SIRF II 2 ");
- LCD_write_string(0,1," 11-11-23 1342 ");
-
- for(i=1;i<4;i++){
- delayms(250);
- }
- //LCD_cls();
- IE=0x90; //开总中断、串口中断
- }
- //串口接收中断
- void uart(void) interrupt 4
- {
- unsigned char tmp;
- if(RI){
- tmp=SBUF;
- switch(tmp){
- case '
- cmd_number=0; //命令类型清空
- mode=1; //接收命令模式
- byte_count=0; //接收位数清空
- break;
- case ',':
- seg_count++; //逗号计数加1
- byte_count=0;
- break;
- case '*':
- switch(cmd_number){
- case 1:
- buf_full|=0x01;
- break;
- case 2:
- buf_full|=0x02;
- break;
- case 3:
- buf_full|=0x04;
- break;
- }
- mode=0;
- break;
- default:
- if(mode==1){
- //命令种类判断
- cmd[byte_count]=tmp; //接收字符放入类型缓存
- if(byte_count>=4){ //如果类型数据接收完毕,判断类型
- if(cmd[0]=='G'){
- if(cmd[1]=='P'){
- if(cmd[2]=='G'){
- if(cmd[3]=='G'){
- if(cmd[4]=='A'){
- cmd_number=1;
- mode=2;
- seg_count=0;
- byte_count=0;
- }
- }
- else if(cmd[3]=='S'){
- if(cmd[4]=='V'){
- cmd_number=2;
- mode=2;
- seg_count=0;
- byte_count=0;
- }
- }
- }
- else if(cmd[2]=='R'){
- if(cmd[3]=='M'){
- if(cmd[4]=='C'){
- cmd_number=3;
- mode=2;
- seg_count=0;
- byte_count=0;
- }
- }
- }
- }
- }
- }
- }
- else if(mode==2){
- //接收数据处理
- switch (cmd_number){
- case 1: //类型1数据接收。GPGGA
- switch(seg_count){
- case 2: //纬度处理
- if(byte_count<9){
- WD[byte_count]=tmp;
- }
- break;
- case 3: //纬度方向处理
- if(byte_count<1){
- WD_a=tmp;
- }
- break;
- case 4: //经度处理
- if(byte_count<10){
- JD[byte_count]=tmp;
- }
- break;
- case 5: //经度方向处理
- if(byte_count<1){
- JD_a=tmp;
- }
- break;
- case 6: //定位判断
- if(byte_count<1){
- lock=tmp;
- }
- break;
- case 7: //定位使用的卫星数
- if(byte_count<2){
- use_sat[byte_count]=tmp;
- }
- break;
- case 9: //高度处理
- if(byte_count<6){
- high[byte_count]=tmp;
- }
- break;
- }
- break;
- case 2: //类型2数据接收。GPGSV
- switch(seg_count){
- case 3: //天空中的卫星总数
- if(byte_count<2){
- total_sat[byte_count]=tmp;
- }
- break;
- }
- break;
- case 3: //类型3数据接收。GPRMC
- switch(seg_count){
- case 1: //时间处理
- if(byte_count<6){
- time[byte_count]=tmp;
- }
- break;
- case 2: //定位判断
- if(byte_count<1){
- if (tmp=='A') {lock=1;}
- else{
- lock=0;}
- }
- break;
- case 3: //纬度处理
- if(byte_count<9){
- WD[byte_count]=tmp;
- }
- break;
- case 4: //纬度方向处理
- if(byte_count<1){
- WD_a=tmp;
- }
- break;
- case 5: //经度处理
- if(byte_count<10){
- JD[byte_count]=tmp;
- }
- break;
- case 6: //经度方向处理
- if(byte_count<1){
- JD_a=tmp;
- }
- break;
- case 7: //速度处理
- if(byte_count<5){
- speed[byte_count]=tmp;
- }
-
- break;
- case 8: //方位角处理
- if(byte_count<5){
- angle[byte_count]=tmp;
- }
- break;
- case 9: //方位角处理
- if(byte_count<6){
- date[byte_count]=tmp;
- }
- break;
- }
- break;
- }
- }
- byte_count++; //接收数位加1
- break;
- }
- }
- RI=0;
- }
复制代码 由于gps是无法仿真的硬件 所以只能用串口来模拟
Keil代码与Proteus仿真下载:
基于51单片机的GPS系统.zip
(102.6 KB, 下载次数: 175)
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