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author | Eric S. Raymond <esr@thyrsus.com> | 2006-08-14 13:32:32 +0000 |
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committer | Eric S. Raymond <esr@thyrsus.com> | 2006-08-14 13:32:32 +0000 |
commit | d34e809dfcede782cdf120c6b4c4543ab70a9229 (patch) | |
tree | 618dbdfc32777d2405a296c6e82a9a02c508f475 /gpsd.xml | |
parent | 158966e711e2cdc1bcade789b9def1584de618d7 (diff) | |
download | gpsd-d34e809dfcede782cdf120c6b4c4543ab70a9229.tar.gz |
Added buffer policy switch.
Diffstat (limited to 'gpsd.xml')
-rw-r--r-- | gpsd.xml | 22 |
1 files changed, 21 insertions, 1 deletions
@@ -320,7 +320,8 @@ identifying the kind of information the attached device returns.</para> <varlistentry> <term>h</term> <listitem> -<para>Heading, "H=%f" in degrees from true north. Only available from True North Technologies or comparable digital compass devices (c.f. 't')</para> +<para>Heading, "H=%f" in degrees from true north. Only available from +True North Technologies or comparable digital compass devices (c.f. 't')</para> </listitem> </varlistentry> --> @@ -334,6 +335,25 @@ received from the GPS, because its type is not yet known.</para></listitem> </varlistentry> <varlistentry> +<term>j</term> +<listitem> +<para>Get or set buffering policy; this only matters for NMEA devices +which report fix data in several separate sentences during the poll +cycle (and in particular it <emphasis>doesn't</emphasis> matter for +SiRF chips). The default (j=0) is to clear all fix data at the start +of each poll cycle, so until the sentence that reports a given piece +of data arrives queries will report ?. Setting j=1 will disable this, +retaining data from the previous cycle. This is a per-user-channel +bit, not a per-device one. The j=0 setting is hyper-correct and never +displays stale data, but may produce a jittery display; the j=1 setting +allows stale data but smooths the display.</para> + +<para>(At protocol level below 3, there was no J command. Note, this +command is experimental and its semantics are subject to change.)</para> +</listitem> +</varlistentry> + +<varlistentry> <term>k</term> <listitem><para>Returns a line consisting of "K=" followed by an integer count of of all GPS devices known to |