0.nmealib简介
1.目录介绍
2.示例代码
//*********************************************************//
- #include <nmea/nmea.h>
- #include <string.h>
- #include <stdio.h>
- int main()
- {
- // 被测试的GPS模块输出数据,仅有GPRMC格式
- char gps_str[] = "$GPRMC,013257.00,A,3129.51829,N,12022.10562,E,0.093,,270813,,,A*7A\r\n";
- nmeaINFO info; // nmea协议解析结果结构体
- nmeaPARSER parser; // nmea协议解析载体
- nmea_zero_INFO(&info); // 填入默认的解析结果
- nmea_parser_init(&parser); // 为解析载体分配内存空间
- // 调用函数完成GPS信息解析,最终结果保留于info数组中
- if( (nmea_parse(&parser, gps_str, (int)strlen(gps_str), &info)) > 0 )
- {
- printf("longitude %.5f\r\n",info.lon);
- printf("latitude %.5f\r\n",info.lat);
- printf("speed %.2f\r\n",info.speed);
- }
- nmea_parser_destroy(&parser); // 释放解析载体的内存空间
- return 0;
- }
//*********************************************************//
- #include <nmea/nmea.h>
- #include <string.h>
- #include <stdio.h>
- int main()
- {
- // 被测试的GPS模块输出数据,仅有GPRMC格式
- char gps_str[] = "$GPRMC,013257.00,A,3129.51829,N,12022.10562,E,0.093,,270813,,,A*7A\r\n";
- nmeaINFO info; // nmea协议解析结果结构体
- nmeaPARSER parser; // nmea协议解析载体
- nmea_zero_INFO(&info); // 填入默认的解析结果
- nmea_parser_init(&parser); // 为解析载体分配内存空间
- // 调用函数完成GPS信息解析,最终结果保留于info数组中
- if( (nmea_parse(&parser, gps_str, (int)strlen(gps_str), &info)) > 0 )
- {
- printf("longitude %.5f\r\n",info.lon);
- printf("latitude %.5f\r\n",info.lat);
- printf("speed %.2f\r\n",info.speed);
- }
- nmea_parser_destroy(&parser); // 释放解析载体的内存空间
- return 0;
- typedef struct _nmeaINFO
- {
- int smask; /**< Mask specifying types of packages from which data have been obtained */
- nmeaTIME utc; /**< UTC of position */
- int sig; /**< GPS quality indicator (0 = Invalid; 1 = Fix; 2 = Differential, 3 = Sensitive) */
- int fix; /**< Operating mode, used for navigation (1 = Fix not available; 2 = 2D; 3 = 3D) */
- double PDOP; /**< Position Dilution Of Precision */
- double HDOP; /**< Horizontal Dilution Of Precision */
- double VDOP; /**< Vertical Dilution Of Precision */
- double lat; /**< Latitude in NDEG - +/-[degree][min].[sec/60] */
- double lon; /**< Longitude in NDEG - +/-[degree][min].[sec/60] */
- double elv; /**< Antenna altitude above/below mean sea level (geoid) in meters */
- double speed; /**< Speed over the ground in kilometers/hour */
- double direction; /**< Track angle in degrees True */
- double declination; /**< Magnetic variation degrees (Easterly var. subtracts from true course) */
- nmeaSATINFO satinfo; /**< Satellites information */
- } nmeaINFO;
//*********************************************************//
- typedef struct _nmeaINFO
- {
- int smask; /**< Mask specifying types of packages from which data have been obtained */
- nmeaTIME utc; /**< UTC of position */
- int sig; /**< GPS quality indicator (0 = Invalid; 1 = Fix; 2 = Differential, 3 = Sensitive) */
- int fix; /**< Operating mode, used for navigation (1 = Fix not available; 2 = 2D; 3 = 3D) */
- double PDOP; /**< Position Dilution Of Precision */
- double HDOP; /**< Horizontal Dilution Of Precision */
- double VDOP; /**< Vertical Dilution Of Precision */
- double lat; /**< Latitude in NDEG - +/-[degree][min].[sec/60] */
- double lon; /**< Longitude in NDEG - +/-[degree][min].[sec/60] */
- double elv; /**< Antenna altitude above/below mean sea level (geoid) in meters */
- double speed; /**< Speed over the ground in kilometers/hour */
- double direction; /**< Track angle in degrees True */
- double declination; /**< Magnetic variation degrees (Easterly var. subtracts from true course) */
- nmeaSATINFO satinfo; /**< Satellites information */
- } nmeaINFO;
3.若干注意点
3.1 重置解析载体缓冲区
- if(0 == (parser->buffer = malloc(buff_size)))
- nmea_error("Insufficient memory!"); // 此时会发生内存分配错误
- else
- {
- parser->buff_size = buff_size;
- resv = 1;
- }
- if(0 == (parser->buffer = malloc(buff_size)))
- nmea_error("Insufficient memory!"); // 此时会发生内存分配错误
- else
- {
- parser->buff_size = buff_size;
- resv = 1;
- }
3.2 注意nmeaINFO结构体大小
4.总结
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