BWDK-M#聯(lián)洲電器#基于51的單片機GPS定位系統(tǒng)設計

一.硬件方案

本設計主要是制作出一款基于51單片機的GPS定位器，根據(jù)設計需求，硬件部分主要由51單片機+GPS定位模塊+LCD12864液晶+LED指示燈+3.3V穩(wěn)壓電路+天線設計而成；如圖：

二.設計功能

（1）單片機選用：51單片機(STC89C51/52、AT89C51/52、AT90C51/52均可兼容)，GPS定位模塊（帶天線）。
（2）采用LCD12864液晶顯示當前的時間、日期、經(jīng)度、速度、航向、高度、海拔等信息。
（3）采用了3顆LED指示燈，紅燈為GPS接收數(shù)據(jù)指示燈，黃燈為GPRNC數(shù)據(jù)有效指示燈，綠燈為GPGGA數(shù)據(jù)有效指示燈。

三.設計原理圖

（1）原理圖主要采用AD軟件進行設計,如圖：

（2）PCB圖如下：

四.軟件設計

主程序源碼

/****************************************
主函數(shù)    
/****************************************/
void main(void)
{
      uchar error_num = 0;
      Uart_Init();  //初始化串口
      Lcd_Init();       //初始化LCD
      GPS_Init();   //初始化GPS
      rev_stop=0;
      REV_NO;
      while(1)
      {
           if (rev_stop)   //如果接收完一行
           {
                 TR0 = 1;   //開啟定時器
                 REV_YES;
                 if (change_page % 2 == 1)  //換頁
                 {
                      if (GPS_GGA_Parse(rev_buf, &GPS))  //解析GPGGA
                      {
                            GGA_YES;
                            GPS_DisplayTwo();  //顯示第二頁信息
                            error_num = 0;
                            gps_flag = 0;
                            rev_stop  = 0;
                            REV_NO;
                      }
                      else
                      {
                            error_num++;
                            if (error_num >= 20) //如果數(shù)據(jù)無效超過20次
                            {
                                  GGA_NO;
                                  error_num = 20;
                                  GPS_Init();     //返回初始化
                            }
                            gps_flag = 0;
                            rev_stop  = 0;
                            REV_NO;
                      }
                 }
                 else
                 {
                      if (GPS_RMC_Parse(rev_buf, &GPS)) //解析GPRMC
                      {
                            RMC_YES;
                            GPS_DisplayOne();   //顯示GPS###頁信息
                            error_num = 0;
                            gps_flag = 0;
                            rev_stop  = 0;
                            led1 = 1;  
                      }
                      else
                      {
                            error_num++;
                            if (error_num >= 20) //如果數(shù)據(jù)無效超過20次
                            {
                                  RMC_NO;
                                  error_num = 20;
                                  GPS_Init();     //返回初始化
                            }
                            gps_flag = 0;
                            rev_stop  = 0;
                            REV_NO;
                      }
                 }
           }
      }
}