diff options
| author | Keith Packard <keithp@keithp.com> | 2014-05-30 17:27:10 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2014-05-30 17:32:52 -0700 |
| commit | 177d3c0333fd4218f01e05c78cbc5f186c8e32c0 (patch) | |
| tree | 0ce36b6fdd633719558f9b5c867abd7a81b180c3 /src | |
| parent | 12c408c5aa1d234fe9c946078d8a343b4fda7ebb (diff) | |
altos: Allow sparse GPS data logging for TeleGPS
When the device hasn't moved for a while, stop logging data. Start as
soon as it moves again.
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/kernel/ao_gps_report_mega.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/kernel/ao_gps_report_mega.c b/src/kernel/ao_gps_report_mega.c index 5e3c71bf..cb0c0fd9 100644 --- a/src/kernel/ao_gps_report_mega.c +++ b/src/kernel/ao_gps_report_mega.c @@ -18,6 +18,43 @@ #include "ao.h" #include "ao_log.h" +#ifndef GPS_SPARSE_LOG +#define GPS_SPARSE_LOG 0 +#endif + +#if GPS_SPARSE_LOG +static int32_t prev_lat, prev_lon, int16_t prev_alt; +static uint8_t has_prev, unmoving; + +#define GPS_SPARSE_UNMOVING_REPORTS 10 +#define GPS_SPARSE_UNMOVING_GROUND 10 +#define GPS_SPARSE_UNMOVING_AIR 10 + +static uint8_t +ao_gps_sparse_should_log(int32_t lat, int32_t lon, int16_t alt) +{ + uint8_t ret = 1; + + if (has_prev && ao_log_running) { + uint32_t h = ao_distance(prev_lat, prev_lon, lat, lon); + uint16_t v = alt > prev_alt ? (alt - prev_alt) : (prev_alt - alt); + + if (h < GPS_SPARSE_UNMOVING_GROUND && v < GPS_SPARSE_UNMOVING_AIR) { + if (unmoving < GPS_SPARSE_UNMOVING_REPORTS) + ++unmoving; + } else + unmoving = 0; + } else + unmoving = 0; + + prev_lat = lat; + prev_lon = lon; + prev_alt = alt; + has_prev = 1; + return unmoving >= GPS_SPARSE_UNMOVING_REPORTS; +} +#endif + void ao_gps_report_mega(void) { @@ -38,7 +75,14 @@ ao_gps_report_mega(void) ao_gps_new = 0; ao_mutex_put(&ao_gps_mutex); +#if GPS_SPARSE_LOG + /* Don't log data if GPS has a fix and hasn't moved for a while */ + if ((gps_data.flags & AO_GPS_VALID) && + !ao_gps_sparse_should_log(gps_data.latitude, gps_data.longitude, gps_data.altitude)) + continue; +#endif if ((new & AO_GPS_NEW_DATA) && (gps_data.flags & AO_GPS_VALID)) { + gps_log.tick = ao_gps_tick; gps_log.type = AO_LOG_GPS_TIME; gps_log.u.gps.latitude = gps_data.latitude; |