1、/utc時間緯度經度定位警告定位質量定位狀態(tài)海拔使用衛(wèi)星速度/utc日期逗號計數gps申口數據解碼程序bit receivingf = 0;bit endf = 0;bit rmcf = 0;bit ggaf = 0;bit vtgf = 0;bit gsaf = 0;uchar gps_time9;uchar xdata gps_wd12;uchar xdata gps_jd13;uchar gps warn;uchar gps_quality;uchar gps_status;uchar gps_alt8;uchar gps_sv3;uchar gps_speed10;uchar gps_

2、date9;uchar segment;uchar bytes_counter;uchar command;void gprmc(uchar);void gpgga(uchar);void gpvtg(uchar);void gpgsa(uchar);void gps (uchar);i *!功能:nmea-183協議解析 /入口： void返回:void全局變更修改:gps_*, segment, command, bytes_counter, newbytef修改記錄:2007. 8. 25 創(chuàng)建 by 54etvl/2007. 8. 26 vl 1修改解碼結構/*/void gps(uc

3、har tmp)(/com_send_byte(tmp);if (tmp = $)起始標志command = 0;receivingf = 1;bytes_counter = 0;segment = 0;清空語句段計數器return;if(receivingf)(if(tmp =,)(+segment;bytes_counter = 0;清空段字節(jié)計數器return;)if (tmp = *) 收到結束標志(receivingf = 0;endf = 1;return;3 / 13if (segment = 0)if (bytes_counter = 3) 段 0,語句類型判斷 switch

4、(tmp)(case f gf : command = 1;語句類型 $gpggaggaf = 1;break;case * m* :command = 2;語句類型 $gprmcrmcf = 1;break;case t :command = 3;語句類型 $gpvtgvtgf = 1;break;case s : break;default:command = 0; 非有效數據類型，終止當前數據接收receivingf = 0;break;5 / 13if (bytes_counter = 4)if (command=0 & tmp=，a)(command = 4;語句類型 $gpgsag

5、saf = 1;)else(switch(command)(case 1：gpgga(tmp);break;case 2:gprmc (tmp);break;case 3:gpvtg(tmp);break;case 4: gpgsa (tmp);break;default：break;+bytes_counter;)newbytef = 0;return;)void gpgga(uchar tmp)(switch(segment)(case 1: if(bytes_counter = 2 | bytes_counter = 5) $gpgga 段 1, utc 時間，hhmmss (時分秒)格

6、 式，取前6位 轉換為hh:mm:ss格式(gps_timebytes_counte r=if (bytes_counter8)gps_timebytes_counte r = tmp;gps_time8 = 0;break;case 2: if(bytes_counter =3)/$gpgga 段 2 處理 緯度 ddmm. mmmm (度分)格式(gps_wdbyte s_counter=.;接收第二個字節(jié)后插入+byt e s_count er;gps_wdll = 0;if (bytes_counter = 0)+byt e s_count er;gps_wdbytes_counter

7、 = tmp；break;9 / 13case 3：gps_wdo = tmp;$gpgga第3段處理 緯度半球n （北半球）或s （南半球）break;case 4:if （bytes_counter =4）/$gpgga 段 4 處理 經度 dddmm. mmmm （度分）格式（gps_jdbyt e s_count er二.；接收第3個字節(jié)后插入，.+byt e s_count er;gps_jd12 :;if （bytes_counter = 0）+byt e s_count er;gps_jdbytes_counter = tmp；break;case 5:gps_jd0 = tmp

8、;$gpgga第5段處理經度半球e （東經）或甲（西經）break;case 6: gps_quality = tmp;break;case 7：if(bytes_counter2)/$gpgga第7段處理 正在使用解算位置的衛(wèi)星數量(0012)(前面的0也將被傳輸)gps_svbyte s_counter =tmp;gps_sv2=0; break;case 9:if(bytes_counter7)/$gpgga第9段處理 海拔高度 度9999. 999999. 9)gps_altbytes_counter11 / 13=tmp;gps_alt byte s_count er+1=，” ；

9、break;default：break; )void gprmc(uchar tmp)(switch(segment) (case 9：if(bytes_counterl & bytes_counter3 & bytes_counter6)年(gps_datebytes_counter_4= tmp;gps.date2=;gps_date8 = 0; break;default：break;)void gpgsa(uchar tmp)switch(segment)(case 2:gps_status = tmp;$gpgsa第2段處理 定位類型，1二沒有定位，2=2d定位，3=3d定位break;default：break;)void gpvtg(uchar tmp)(switch(segment)(case 7: if (bytes_counter 7)地面速率(0000. 01851.8公里/小時，前面的0也將被傳輸)(gps_speedbytes_counter = tmp