#1楼主：才写了一个51接受gps信号，用1602显示的c程序，大家看看怎样

文章发表于：2008-05-09 11:38

cpu:stc89c58    晶振频率：11.0592Mhz
硬件连接：
---------------------------------------------------------------
|DB0-----P0.0 | DB4-----P0.4 | WR-------P2.2 | A0--------P2.1 |
|DB1-----P0.1 | DB5-----P0.5 | RD-------P2.4 | Vo悬空 |
|DB2-----P0.2 | DB6-----P0.6 | CS-------P2.5 |
|DB3-----P0.3 | DB7-----P0.7 | RST-------P2.3 |            
---------------------------------------------------------------
******************************************************************************/

#include <reg52.h>
#include <string.h>

#define LCM_Data P0
#define Busy 0x80   //用于检测LCM状态字中的Busy标识
sbit LCM_RW = P2^2;  //1602定义引脚
sbit LCM_RS = P2^1;
sbit LCM_E = P2^5;

//sbit GPS_SPD=P1^2;
//sbit SPD_TYPE=P1^3;
sbit KEY1=P1^1;


char code TIME_AREA= 8;            //时区

//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 time[6];        //时间
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 dot_count;        //小数点计数器
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;
bit spd_type;

void sys_init(void);
bit chk_key(void);

void WriteDataLCM(unsigned char WDLCM);
void WriteCommandLCM(unsigned char WCLCM,BuysC);
unsigned char ReadDataLCM(void);
unsigned char ReadStatusLCM(void);
void LCMInit(void);
void LCD_cls(void);
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *DData);
void Delay5Ms(void);
void Delay400Ms(void);

main()
{
    unsigned char i;
    char Bhour;
    unsigned int Knots;
    sys_init();

    while(1)
    {
        if(buf_full==0)                //无GPS信号时
        {
            dsp_count++;
            if(dsp_count>=65000)
                {
                LCD_cls();            //清屏
                DisplayListChar(0,0,"No GPS connect..");
                while(buf_full==0);
                LCD_cls();    
                dsp_count=0;
                }
        }
        else
            {                        //有GPS信号时
            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
                        DisplayListChar(0,0,"*---.--.----  ");
                        DisplayListChar(0,1,"* --.--.----  ");                    
                        }
                    else
                        {                            //如果已定位
                        DisplayOneChar(0,0,JD_a);            //显示经度
                        for(i=0;i<3;i++)
                            {
                            DisplayOneChar(i+1,0,JD[i]);
                            }
                        DisplayOneChar(4,0,'.');
                        for(i=3;i<10;i++)
                            {
                            DisplayOneChar(i+2,0,JD[i]);
                            }

                        DisplayOneChar(0,1,WD_a);            //显示纬度
                        DisplayOneChar(1,1,' ');
                        for(i=0;i<2;i++)
                            {
                            DisplayOneChar(i+2,1,WD[i]);
                            }            
                        DisplayOneChar(4,1,'.');
                        for(i=2;i<9;i++)
                            {
                            DisplayOneChar(i+3,1,WD[i]);
                            }