?? 2051gps.c
字號(hào):
/*************************************
GPS解碼1602顯示程序
作者：BG4UVR
最后更新：
2007.01.27
1.2版，改時(shí)間由RMC語(yǔ)句解碼，取消日期顯示
2007.01.25
1.1版，修正定位后頁(yè)面不能轉(zhuǎn)換的BUG。
1.0版，基本功能。
***************************************/
#include <reg2051.h>
#include "1602.h"
sbit GPS_SPD=P1^1;
sbit SPD_TYPE=P1^0;
sbit KEY1=P3^7;
/*
sbit GPS_SPD=P1^4;
sbit KEY1=P1^6;
sbit SPD_TYPE=P1^5;
*/
//各位見(jiàn)笑了，加密存儲(chǔ)開(kāi)機(jī)版權(quán)信息。免得被人改目標(biāo)代碼 :D
unsigned char code info[]={ 'D'^0xab,'e'^0xab,'s'^0xab,'i'^0xab,'g'^0xab,'n'^0xab,' '^0xab,'b'^0xab,
'y'^0xab,' '^0xab,'B'^0xab,'G'^0xab,'4'^0xab,'U'^0xab,'V'^0xab,'R'^0xab,};
char code TIME_AREA= 8; //時(shí)區(qū)
//GPS數(shù)據(jù)存儲(chǔ)數(shù)組
unsigned char JD[10]; //經(jīng)度
unsigned char JD_a; //經(jīng)度方向
unsigned char WD[9]; //緯度
unsigned char WD_a; //緯度方向
unsigned char time[6]; //時(shí)間
unsigned char speed[5]; //速度
unsigned char high[6]; //高度
unsigned char angle[5]; //方位角
unsigned char use_sat[2]; //使用的衛(wèi)星數(shù)
unsigned char total_sat[2]; //天空中總衛(wèi)星數(shù)
unsigned char lock; //定位狀態(tài)
//串口中斷需要的變量
unsigned char seg_count; //逗號(hào)計(jì)數(shù)器
unsigned char dot_count; //小數(shù)點(diǎn)計(jì)數(shù)器
unsigned char byte_count; //位數(shù)計(jì)數(shù)器
unsigned char cmd_number; //命令類(lèi)型
unsigned char mode; //0：結(jié)束模式，1：命令模式，2：數(shù)據(jù)模式
unsigned char buf_full; //1：整句接收完成，相應(yīng)數(shù)據(jù)有效。0：緩存數(shù)據(jù)無(wú)效。
unsigned char cmd[5]; //命令類(lèi)型存儲(chǔ)數(shù)組
//顯示需要的變量
unsigned int dsp_count; //刷新次數(shù)計(jì)數(shù)器
unsigned char time_count;
bit page;
bit spd_type;
void sys_init(void);
bit chk_key(void);
main()
{
unsigned char i;
char Bhour;
unsigned int Knots;
sys_init();
while(1){
if(buf_full==0) //無(wú)GPS信號(hào)時(shí)
{
dsp_count++;
if(dsp_count>=65000){
LCD_cls(); //清屏
LCD_write_string(0,0,"No GPS connect..");
while(buf_full==0);
LCD_cls();
dsp_count=0;
}
}
else{ //有GPS信號(hào)時(shí)
if(chk_key()){ //檢測(cè)到按鍵切換顯示
page=!page;
LCD_cls();
}
if(!page){ //頁(yè)面1
if(buf_full|0x01){ //GGA語(yǔ)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); //顯示經(jīng)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); //顯示緯度
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]); //顯示接收衛(wèi)星數(shù)
LCD_write_char(15,0,use_sat[1]);
buf_full&=~0x01;
dsp_count=0;
}
if(buf_full|0x02){ //GSV語(yǔ)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){
buf_full&=~0x04;
dsp_count=0;
}
}
else{ //頁(yè)面2
if(buf_full|0x01){ //GGA語(yǔ)句
buf_full&=~0x01;
dsp_count=0;
}
if(buf_full|0x02){
buf_full&=~0x02;
dsp_count=0;
}
if(buf_full|0x04){ //RMC語(yǔ)句
Bhour=((time[0]-0x30)*10+time[1]-0x30)+TIME_AREA;
if(Bhour>=24){
Bhour-=24;
}else if(Bhour<0){
Bhour+=24;
}
LCD_write_string(2,1,"BJT ");
LCD_write_char(6,1,Bhour/10+0x30);
LCD_write_char(7,1,Bhour%10+0x30);
LCD_write_char(8,1,':');
LCD_write_char(9,1,time[2]);
LCD_write_char(10,1,time[3]);
LCD_write_char(11,1,':');
LCD_write_char(12,1,time[4]);
LCD_write_char(13,1,time[5]);
if(spd_type){
LCD_write_string(5,0,"km/h A");
}else{
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{ //已經(jīng)定位
if(spd_type){ //km/h顯示
for(i=0;i<5;i++){
LCD_write_char(i,0,speed[i]);
}
}else{ //knot顯示
Knots= (((speed[0]-0x30)*1000
+(speed[1]-0x30)*100
+(speed[2]-0x30)*10
+(speed[4]-0x30))*1000)/1852;
LCD_write_char(0,0,Knots/1000+0x30);
LCD_write_char(1,0,(Knots%1000)/100+0x30);
LCD_write_char(2,0,(Knots%100)/10+0x30);
LCD_write_char(3,0,'.');
LCD_write_char(4,0,Knots%10+0x30);
}
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);
}
}
return(0);
}
//系統(tǒng)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 = 0xfd; /* TH1: reload value for 9600 baud @ 11.059MHz */
}else{
TH1 = 0xfa; /* TH1: reload value for 4800 baud @ 11.059MHz */
}
if(SPD_TYPE){
spd_type=1; //速度單位km/h
}else{
spd_type=0; //速度單位knot
}
TR1 = 1; /* TR1: timer 1 run */
LCD_init(); //初始化LCD
LCD_write_string(0,0,"GPS Monitor V1.2");
for(i=0;i<16;i++){ //顯示版權(quán)信息
LCD_write_char(i,1,info[i]^0xab);
}
for(i=1;i<4;i++){
delayms(250);
}
LCD_cls();
IE=0x90; //開(kāi)總中斷、串口中斷
}
//串口接收中斷
void uart(void) interrupt 4
{
unsigned char tmp;
if(RI){
tmp=SBUF;
switch(tmp){
case '$':
cmd_number=0; //命令類(lèi)型清空
mode=1; //接收命令模式
byte_count=0; //接收位數(shù)清空
break;
case ',':
seg_count++; //逗號(hào)計(jì)數(shù)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){
//命令種類(lèi)判斷
cmd[byte_count]=tmp; //接收字符放入類(lèi)型緩存
if(byte_count>=4){ //如果類(lèi)型數(shù)據(jù)接收完畢，判斷類(lèi)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){
//接收數(shù)據(jù)處理
switch (cmd_number){
case 1: //類(lèi)型1數(shù)據(jù)接收。GPGGA
switch(seg_count){
case 2: //緯度處理
if(byte_count<9){
WD[byte_count]=tmp;
}
break;
case 3: //緯度方向處理
if(byte_count<1){
WD_a=tmp;
}
break;
case 4: //經(jīng)度處理
if(byte_count<10){
JD[byte_count]=tmp;
}
break;
case 5: //經(jīng)度方向處理
if(byte_count<1){
JD_a=tmp;
}
break;
case 6: //定位判斷
if(byte_count<1){
lock=tmp;
}
break;
case 7: //定位使用的衛(wèi)星數(shù)
if(byte_count<2){
use_sat[byte_count]=tmp;
}
break;
case 9: //高度處理
if(byte_count<6){
high[byte_count]=tmp;
}
break;
}
break;
case 2: //類(lèi)型2數(shù)據(jù)接收。GPGSV
switch(seg_count){
case 3: //天空中的衛(wèi)星總數(shù)
if(byte_count<2){
total_sat[byte_count]=tmp;
}
break;
}
break;
case 3: //類(lèi)型3數(shù)據(jù)接收。GPRMC
switch(seg_count){
case 1:
if(byte_count<6){ //時(shí)間處理
time[byte_count]=tmp;
}
break;
case 7: //速度處理
if(byte_count<5){
speed[byte_count]=tmp;
}
break;
case 8: //方位角處理
if(byte_count<5){
angle[byte_count]=tmp;
}
break;
}
break;
}
}
byte_count++; //接收數(shù)位加1
break;
}
}
RI=0;
}
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