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| author | Eric S. Raymond <esr@thyrsus.com> | 2013-10-10 23:35:25 -0400 |
|---|---|---|
| committer | Eric S. Raymond <esr@thyrsus.com> | 2013-10-10 23:35:25 -0400 |
| commit | 39ec14f840d0ebbe211d2631a27814109afb30a2 (patch) | |
| tree | 8312a30b99d6487c921622966d2f18f2a3b56549 /driver_ubx.c | |
| parent | c285b72bb610039b38d5292ff7859402546aa41f (diff) | |
| download | gpsd-39ec14f840d0ebbe211d2631a27814109afb30a2.tar.gz | |
Add a caveat.
Diffstat (limited to 'driver_ubx.c')
| -rw-r--r-- | driver_ubx.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/driver_ubx.c b/driver_ubx.c index f382e9f3..1d591311 100644 --- a/driver_ubx.c +++ b/driver_ubx.c @@ -607,7 +607,15 @@ static void ubx_event_hook(struct gps_device_t *session, event_t event) (void)ubx_write(session, 0x06u, 0x16, msg, 8); /*@ +type @*/ - /* turn off NMEA output, turn on UBX on this port */ + /* + * Turn off NMEA output, turn on UBX on this port. + * + * Note: this may fail if the device's firmware image has been + * configured to disallow the mode switching. The Navsys + * GR601W, aka "Macx-1", is one example. We can recognize it + * as a UBX because it responds to a MON_VER probe, but it + * won't change modes. + */ if (session->mode == O_OPTIMIZE) ubx_mode(session, MODE_BINARY); } else if (event == event_deactivate) { |