Devuan fork of gpsd
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  1. <sect1 id="pseudonmea.c"><title><filename>libgpsd_core.c</filename></title>
  2. <informaltable frame='all' pgwide='1'>
  3. <tgroup cols='2'>
  4. <colspec colname='c1'></colspec>
  5. <colspec colname='c2'></colspec>
  6. <spanspec spanname='s1' namest='c1' nameend='c2'></spanspec>
  7. <!-- Not documented: nmea_tpv_dump(), nmea_sky_dump() -->
  8. <thead>
  9. <row>
  10. <entry>Functions:-</entry><entry>Generate pseudo-NMEA corresponding to binary packet reports</entry>
  11. </row>
  12. </thead>
  13. <tfoot>
  14. <row>
  15. <entry spanname='s1' align='left'>Notes based on code as of Mon Apr 5 21:38:06 2010 -0400.</entry>
  16. </row>
  17. </tfoot>
  18. <tbody>
  19. <row>
  20. <entry><function>static double degtodm(double a)</function></entry>
  21. <entry><para>Converts a fractional degree value (like 125.3567) into an NMEA field as dddmm.xxx (like 12521.402).</para></entry>
  22. </row>
  23. <row>
  24. <entry><function>void gpsd_position_fix_dump(struct gps_device_t *session, /char bufp[], size_t len)</function></entry>
  25. <entry><para>If possible, create a $GPGGA message (full time, position and fix data) from the fix data, taking care about the validity of subsidiary fields like HDOP and altitude.</para></entry>
  26. </row>
  27. <row>
  28. <entry><function>static void gpsd_transit_fix_dump(struct gps_device_t *session, char bufp[], size_t len)</function></entry>
  29. <entry><para>Create a $GPRMC message (minimum navigation data) from the fix data.</para></entry>
  30. </row>
  31. <row>
  32. <entry><function>static void gpsd_binary_fix_dump(struct gps_device_t *session, char bufp[], size_t len)</function></entry>
  33. <entry><para>Make a call to <function>gpsd_position_fix_dump()</function> and <function>gpsd_transit_fix_dump()</function>.</para></entry>
  34. </row>
  35. <row>
  36. <entry><function>static void gpsd_binary_satellite_dump(struct gps_device_t *session, char bufp[], size_t len)</function></entry>
  37. <entry><para>Create one or more $GPGSV messages from the status data of all satellites we know about.</para></entry>
  38. </row>
  39. <row>
  40. <entry><function>static void gpsd_binary_quality_dump(struct gps_device_t *session, char bufp[], size_t len)</function></entry>
  41. <entry><para>Create a $GPGSA message taking care that if any xDOP is not valid, we substitute a <quote>0.0</quote> value.</para><para>If any of the error estimates is available, generate a $PGRME message again taking care about possibly invalid values.</para></entry>
  42. </row>
  43. <row>
  44. <entry><function>static void gpsd_binary_dump(struct gps_device_t *session, char bufp[], size_t len)</function></entry>
  45. <entry><para>Dump such binary data as we have available; a fix, a quality value and a satellite status block. Each is enabled by the appropriate status bits in the session mask variable.</para></entry>
  46. </row>
  47. </tbody>
  48. </tgroup>
  49. </informaltable>
  50. </sect1>