GPS串口数据解码程序

1、GPS串口数据解码程序bit ReceivingF = 0;bit EndF = 0;bit RMCF = 0;bit GGAF = 0;bit VTGF = 0;bit GSAF = 0;uchar GPS_time9;UTC 时间uchar xdata GPS_wd12;纬度uchar xdata GPS_jd13;经度uchar GPS_warn;定位警告uchar GPS_quality;定位质量uchar GPS_status;/ 定位状态uchar GPS_alt8;海拔uchar GPS_sv3;使用卫星uchar GPS_speed10;速度uchar GPS_date9;UT

2、C 日期uchar Segment; uchar逗号计数Bytes_counter; ucharCommand;void GPRMC(uchar);void GPGGA(uchar);void GPVTG(uchar);void GPGSA(uchar);void gps(uchar);*/功能：NMEA-183协议解析入口 :void返回:void全局变更修改:GPS_*,Segment,command,Bytes_counter,NewByteF修改记录：2007.8.25 创建 by 54etv1/2007.8.26 v1.1修改解码结构*/void gps(uchar tmp)com_

3、send_byte(tmp);if(tmp = $)/ 起始标志Command = 0;ReceivingF = 1;Bytes_counter = 0;Segment = 0;清空语句段计数器return;if(ReceivingF)if(tmp =,)+Segment;Bytes_counter=0；/清空段字节计数器return;if(tmp*)/收到结束标志ReceivingF = 0;EndF = 1;return;if(Segment = 0)if(Bytes_counter = 3)/段 0,语句类型判断switch(tmp)caseG:Command=1;/语句类型$GPGGA

4、GGAF = 1;break;caseM:Command=2;/语句类型$GPRMCRMCF = 1;break;caseCommand=3;/语句类型$GPVTGVTGF = 1;break;caseS:break;default:Command=0;/非有效数据类型，终止当前数据接收ReceivingF=0;break;if(Bytes_counter=4)if(Command=0& tmp=A)Command=4;/语句类型 $GPGSAGSAF = 1;elseswitch(Command)case 1:GPGGA(tmp); break;case 2:GPRMC(tmp); brea

5、k;case 3:GPVTG(tmp); break;case 4:GPGSA(tmp);break;default:break;+Bytes_counter;NewByteF = 0;return;void GPGGA(uchar tmp)switch(Segment)if(Bytes_counter = 2 | Bytes_counter = 5) /$GPGGA 段 1, UTC 时间， hhmmss (时分秒)格式，取前6位 转换为HH:MM:SS 格式GPS_timeBytes_counter =:;+Bytes_counter;if(Bytes_counter8)GPS_timeB

6、ytes_counter = tmp;GPS_time8 = 0;break;if(Bytes_counter = 3)/$GPGGA 段 2 处理 纬度 ddmm.mmmm (度分）格式GPS_wdBytes_counter +Bytes_counter;接收第二个字节后插入GPS_wd11 = 0;if(Bytes_counter = 0) +Bytes_counter;GPS_wdBytes_counter break;=tmp;GPS_wd0 = tmp;或S (南半球)break;/$GPGGA第3段处理纬度半球N （北半球）if(Bytes_counter = 4)(度分)格式GP

7、S_jdBytes_counter = +Bytes_counter; GPS_jd12 = 0;if(Bytes_counter = 0) +Bytes_counter;GPS_jdBytes_counter = tmp; break;/$GPGGA 段 4 处理经度 dddmm.mmmm接收第3个字节后插入GPS_jd0 = tmp;W (西经)break;/$GPGGA第5段处理经度半球E （东经）或GPS_quality = tmp;break;/$GPGGA第7段处理 正在使用解算位置的卫if(Bytes_counter2)星数量（0012）（前面的0也将被传输）=tmp;GPS_s

8、vBytes_counterGPS_sv2 = 0;break;case 9: if(Bytes_counter7)/$GPGGA 第 9 段处理 海拔高度(-9999.999999.9 )GPS_altBytes_counter = tmp;break;default:break; void GPRMC(uchar tmp)switch(Segment)case 9:if(Bytes_counter1 & Bytes_counter3 & Bytes_counter6)GPS_dateBytes_counter-4GPS_date2GPS_date8 = 0;break;default:break;void GPGSA(uchar tmp)switch(Segment)case 2:GPS_status = tmp;2=2D定位，3=3D定位break;default:break;=tmp;/$GPGSA第2段处理 定位类型，1二没有定位,0000.01851.8 公里/小时，前面的0也将被传输)=tmp;=$;/这里4个字符是 Km/h=; ;=/;=#;=0；void GPVTG(uchar tmp)switch(Segment)case 7:if(Bytes_counter 7) 地面速率(GPS_speedBytes_counte