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completed gpsservice README.md

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hughbarney 2021-01-20 21:23:22 +00:00
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apps/gpsservice/README.md
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@ -26,15 +26,15 @@ facilitate an OS grid reference display in a watch face.
The Settings App enables you set the following options for the GPS
Service. Go to Settings, select App/Widgets and then 'GPS Service'.
* GPS - On/Off. When this value is changed the GPS Service will be
- GPS - On/Off. When this value is changed the GPS Service will be
powered on or off and the GPS Widget will be displayed.
* Power Mode:
- Power Mode:
** Super-E - the factory default setup for the GPS. The
recommended power saving mode.
- SuperE - the factory default setup for the GPS. The recommended
power saving mode.
** PSMOO - On/Off power saving mode. Configured by interval and
- PSMOO - On/Off power saving mode. Configured by interval and
search time. Choose this mode if you are happy to get a GPS
position update less often (say every 1 or 2 minutes). The longer
the interval the more time the GPS will spend sleeping in low
@ -42,12 +42,25 @@ Service. Go to Settings, select App/Widgets and then 'GPS Service'.
open country an update once every 60 seconds is adequate to put
you within a 6 digit grid refernce sqaure.
- update - the time between two position fix attempts.
- search - the time between two acquisition attempts if the receiver
is unable to get a position fix.
## Screenshots
* GPS Watch face
### GPS Watch face
* The Age value is the number of seconds since the last position fix was received.
![](gps_face.jpg)
* Grid Reference Watch face
### Grid Reference Watch face
* The time shown is the timestamp of the last position fix.
* The age value is shown at the bottom of the screen.
![](osref_face.jpg)
@ -57,7 +70,11 @@ Service. Go to Settings, select App/Widgets and then 'GPS Service'.
## References
* data sheet
* power saving PDF
* other code
* [UBLOX M8 Receiver Data Sheet](https://www.u-blox.com/sites/default/files/products/documents/u-blox8-M8_ReceiverDescrProtSpec_%28UBX-13003221%29.pdf)
* [UBLOX Power Management App Note](https://www.u-blox.com/sites/default/files/products/documents/PowerManagement_AppNote_%28UBX-13005162%29.pdf)
* Some useful code on Github and be found [here](https://portal.u-blox.com/s/question/0D52p0000925T00CAE/ublox-max-m8q-getting-stuck-when-sleeping-with-extint-pin-control)
and [here](https://github.com/thasti/utrak/blob/master/gps.c)