gpsd/doc/explan_pseudonmea.c.xml

<sect1 id="pseudonmea.c"><title><filename>libgpsd_core.c</filename></title>
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<!-- Not documented: nmea_tpv_dump(), nmea_sky_dump() -->

<thead>
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  <entry>Functions:-</entry><entry>Generate pseudo-NMEA corresponding to binary packet reports</entry>
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<tfoot>
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  <entry spanname='s1' align='left'>Notes based on code as of Mon Apr 5 21:38:06 2010 -0400.</entry>
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  <entry><function>static double degtodm(double a)</function></entry>
  <entry><para>Converts a fractional degree value (like 125.3567) into an NMEA field as dddmm.xxx (like 12521.402).</para></entry>
</row>
<row>
  <entry><function>void gpsd_position_fix_dump(struct gps_device_t *session, /char bufp[], size_t len)</function></entry>
  <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>
</row>
<row>
  <entry><function>static void gpsd_transit_fix_dump(struct gps_device_t *session, char bufp[], size_t len)</function></entry>
  <entry><para>Create a $GPRMC message (minimum navigation data) from the fix data.</para></entry>
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<row>
  <entry><function>static void gpsd_binary_fix_dump(struct gps_device_t *session, char bufp[], size_t len)</function></entry>
  <entry><para>Make a call to <function>gpsd_position_fix_dump()</function> and <function>gpsd_transit_fix_dump()</function>.</para></entry>
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<row>
  <entry><function>static void gpsd_binary_satellite_dump(struct gps_device_t *session, char bufp[], size_t len)</function></entry>
  <entry><para>Create one or more $GPGSV messages from the status data of all satellites we know about.</para></entry>
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  <entry><function>static void gpsd_binary_quality_dump(struct gps_device_t *session, char bufp[], size_t len)</function></entry>
  <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>
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  <entry><function>static void gpsd_binary_dump(struct gps_device_t *session, char bufp[], size_t len)</function></entry>
  <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>
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