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SparkFun u-blox Arduino Library
===========================================================
**Please note: this library is now deprecated. Please migrate to the new [SparkFun u-blox GNSS Arduino Library](https://github.com/sparkfun/SparkFun_u-blox_GNSS_Arduino_Library).**
**You can find details on how to migrate to v2.0 [here](https://github.com/sparkfun/SparkFun_u-blox_GNSS_Arduino_Library#migrating-to-v20).**
You can install v2.0 via the Arduino Library Manager. Search for **SparkFun u-blox GNSS**.
<table class="table table-hover table-striped table-bordered">
<tr align="center">
<td><a href="https://www.sparkfun.com/products/15136"><img src="https://cdn.sparkfun.com//assets/parts/1/3/5/1/4/15136-SparkFun_GPS-RTK2_Board_-_ZED-F9P__Qwiic_-03.jpg"></a></td>
<td><a href="https://www.sparkfun.com/products/15005"><img src="https://cdn.sparkfun.com//assets/parts/1/3/3/2/0/15005-SparkFun_GPS-RTK__Qwiic__-_NEO-M8P-2-00.jpg"></a></td>
<td><a href="https://www.sparkfun.com/products/15193"><img src="https://cdn.sparkfun.com//assets/parts/1/3/6/1/4/15193-SparkFun_GPS_Breakout_-_U.FL__ZOE-M8__Qwiic_-01.jpg"></a></td>
<td><a href="https://www.sparkfun.com/products/15210"><img src="https://cdn.sparkfun.com//assets/parts/1/3/6/4/8/15210-SparkFun_GPS_Breakout_-_Chip_Antenna__SAM-M8Q__Qwiic_-01.jpg"></a></td>
<td><a href="https://www.sparkfun.com/products/15733"><img src="https://cdn.sparkfun.com//assets/parts/1/4/3/2/2/15733-SparkFun_GPS_Breakout_-_NEO-M9N__Chip_Antenna__Qwiic_-01.jpg"></a></td>
</tr>
<tr align="center">
<td><a href="https://www.sparkfun.com/products/15136">SparkFun GPS-RTK2 - ZED-F9P (GPS-15136)</a></td>
<td><a href="https://www.sparkfun.com/products/15005">SparkFun GPS-RTK - NEO-M8P-2 (GPS-15005)</a></td>
<td><a href="https://www.sparkfun.com/products/15193">SparkFun ZOE-M8Q Breakout (GPS-15193)</a></td>
<td><a href="https://www.sparkfun.com/products/15210">SparkFun SAM-M8Q Breakout (GPS-15210)</a></td>
<td><a href="https://www.sparkfun.com/products/15733">SparkFun NEO-M9N Breakout (GPS-15733)</a></td>
</tr>
</table>
U-blox makes some incredible GPS receivers covering everything from low-cost, highly configurable modules such as the SAM-M8Q all the way up to the surveyor grade ZED-F9P with precision of the diameter of a dime. This library focuses on configuration and control of u-blox devices over I2C (called DDC by u-blox) and Serial. The UBX protocol is supported over both I2C and serial, and is a much easier and lighterweight interface to a GPS module. Stop parsing NMEA data! And simply ask for the datums you need.
This library can be installed via the Arduino Library manager. Search for **SparkFun u-blox GNSS**.
Although not an integrated part of the library, you will find an example of how to communicate with the older series 6 and 7 modules in the [examples folder](./examples/Series_6_7).
Max (400kHz) I2C Support
-------------------
To achieve 400kHz I2C speed please be sure to remove all pull-ups on the I2C bus. Most, if not all, u-blox modules include pull ups on the I2C lines (sometimes called DDC in their manuals). Cut all I2C pull up jumpers and/or remove them from peripheral boards. Otherwise, various data glitches can occur. See issues [38](https://github.com/sparkfun/SparkFun_Ublox_Arduino_Library/issues/38) and [40](https://github.com/sparkfun/SparkFun_Ublox_Arduino_Library/issues/40) for more information. If possible, run the I2C bus at 100kHz.
-------------------
Want to help? Please do! We are always looking for ways to improve and build out features of this library.
* We are always interested in adding SPI support with a checkUbloxSPI() function
Thanks to:
* [trycoon](https://github.com/sparkfun/SparkFun_Ublox_Arduino_Library/pull/7) for fixing the lack of I2C buffer length defines.
* [tve](https://github.com/tve) for building out serial additions and examples.
* [Redstoned](https://github.com/Redstoned) and [davidallenmann](https://github.com/davidallenmann) for adding PVT date and time.
* [wittend](https://forum.sparkfun.com/viewtopic.php?t=49874) for pointing out the RTCM print bug.
* Big thanks to [PaulZC](https://github.com/PaulZC) for implementing the combined key ValSet method, geofence functions, better saveConfig handling, as well as a bunch of small fixes.
* [RollieRowland](https://github.com/RollieRowland) for adding HPPOSLLH (High Precision Geodetic Position).
* [tedder](https://github.com/tedder) for moving iTOW to PVT instead of HPPOS and comment cleanup.
* [grexjmo](https://github.com/grexjmo) for pushing for a better NMEA sentence configuration method.
* [averywallis](https://github.com/averywallis) for adding good comments to the various constants.
* [blazczak](https://github.com/blazczak) and [geeksville](https://github.com/geeksville) for adding support for the series 6 and 7 modules.
* [bjorn@unsurv](https://github.com/unsurv) for adding powerOff and powerOffWithInterrupt.
* [dotMorten](https://github.com/dotMorten) for the MSGOUT keys, autoHPPOSLLH, autoDOP and upgrades to autoPVT.
* [markuckermann](https://github.com/markuckermann) for spotting the config layer gremlins
* [vid553](https://github.com/vid553) for the Zephyr port
* [balamuruganky](https://github.com/balamuruganky) for the NAV-PVT velocity parameters, getSpeedAccEst, getHeadingAccEst, getInvalidLlh, getHeadVeh, getMagDec and getMagAcc
* [nelarsen](https://github.com/nelarsen) for the buffer overrun improvements
* [mstranne](https://github.com/mstranne) and [shaneperera](https://github.com/shaneperera) for the pushRawData suggestion
* [rubienr](https://github.com/rubienr) for spotting the logical AND issues
Need a Python version for Raspberry Pi? Checkout the [Qwiic Ublox GPS Py module](https://github.com/sparkfun/Qwiic_Ublox_Gps_Py).
Need a library for the u-blox and Particle? Checkout the [Particle library](https://github.com/aseelye/SparkFun_Ublox_Particle_Library) fork.
Need a C++ version which runs on Linux? Checkout the [Ublox_Linux_Library](https://github.com/balamuruganky/Ublox_Linux_Library).
Contributing
--------------
If you would like to contribute to this library: please do, we truly appreciate it, but please follow [these guidelines](./CONTRIBUTING.md). Thanks!
Repository Contents
-------------------
* **/examples** - Example sketches for the library (.ino). Run these from the Arduino IDE.
* **/src** - Source files for the library (.cpp, .h).
* **[keywords.txt](./keywords.txt)** - Keywords from this library that will be highlighted in the Arduino IDE.
* **[library.properties](./library.properties)** - General library properties for the Arduino package manager.
* **[CONTRIBUTING.md](./CONTRIBUTING.md)** - Guidelines on how to contribute to this library.
* **[Theory.md](./Theory.md)** - provides detail on how data is processed by the library.
Documentation
--------------
* **[Installing an Arduino Library Guide](https://learn.sparkfun.com/tutorials/installing-an-arduino-library)** - Basic information on how to install an Arduino library.
Polling vs. Auto-Reporting
--------------------------
This library supports two modes of operation for getting navigation information with the `getPVT`
function (based on the `UBX_NAV_PVT` protocol packet): polling and auto-reporting.
The standard method is for the sketch to call `getPVT` (or one of the `getLatitude`, `getLongitude`,
etc. methods) when it needs a fresh navigation solution. At that point the library sends a request
to the GPS to produce a fresh solution. The GPS then waits until the next measurement occurs (e.g.
once per second or as set using `setNavigationFrequency`) and then sends the fresh data.
The advantage of this method is that the data received is always fresh, the downside is that getPVT
can block until the next measurement is made by the GPS, e.g. up to 1 second if the nav frequency is
set to one second.
An alternate method can be chosen using `setAutoPVT(true)` which instructs the GPS to send the
navigation information (`UBX_NAV_PVT` packet) as soon as it is produced. This is the way the older
NMEA navigation data has been used for years. The sketch continues to call `getPVT` as before but
under the hood the library returns the data of the last solution received from the GPS, which may be
a bit out of date (how much depends on the `setNavigationFrequency` value).
The advantage of this method is that getPVT does not block: it returns true if new data is available
and false otherwise. The disadvantages are that the data may be a bit old and that buffering for
these spontaneus `UBX_NAV_PVT` packets is required (100 bytes each). When using Serial the buffering
is an issue because the std serial buffer is 32 or 64 bytes long depending on Arduino version. When
using I2C the buffering is not an issue because the GPS device has at least 1KB of internal buffering
(possibly as large as 4KB).
As an example, assume that the GPS is set to produce 5 navigation
solutions per second and that the sketch only calls getPVT once a second, then the GPS will queue 5
packets in its internal buffer (about 500 bytes) and the library will read those when getPVT is
called, update its internal copy of the nav data 5 times, and return `true` to the sketch. The
sketch calls `getLatitude`, etc. and retrieve the data of the most recent of those 5 packets.
The library also supports:
* `autoHPPOSLLH`
* `autoDOP`
* `autoHNRAtt`
* `autoHNRDyn`
* `autoHNRPVT`
Memory Usage
---------------------------------
Version 1.8.9 introduced support for `autoHNR` on the NEO-M8U, and that tipped the balance in terms of RAM use on the ATmega328.
The library does still run on the ATmega328 but you will see _**Low memory available, stability problems may occur**_ warnings
as the global variables now occupy 1540 bytes of RAM. If you do want to run this library on the ATmega328, you may need to regress
to Version 1.8.8 via the Library Manager.
Products That Use This Library
---------------------------------
* [GPS-16481](https://www.sparkfun.com/products/16481) - SparkFun GPS-RTK-SMA Breakout - ZED-F9P (Qwiic)
* [GPS-15136](https://www.sparkfun.com/products/15136) - SparkFun GPS-RTK2 Board - ZED-F9P (Qwiic)
* [GPS-15005](https://www.sparkfun.com/products/15005) - SparkFun GPS-RTK Board - NEO-M8P-2 (Qwiic)
* [GPS-15210](https://www.sparkfun.com/products/15210) - SparkFun GPS Breakout - Chip Antenna, SAM-M8Q (Qwiic)
* [GPS-15193](https://www.sparkfun.com/products/15193) - SparkFun GPS Breakout - Chip Antenna, ZOE-M8Q (Qwiic)
* [GPS-15733](https://www.sparkfun.com/products/15733) - SparkFun GPS Breakout - NEO-M9N, Chip Antenna (Qwiic)
* [GPS-15712](https://www.sparkfun.com/products/15712) - SparkFun GPS Breakout - NEO-M9N, U.FL (Qwiic)
* [GPS-16329](https://www.sparkfun.com/products/16329) - SparkFun GPS Dead Reckoning Breakout - NEO-M8U (Qwiic)
* [SPX-14980](https://www.sparkfun.com/products/14980) - SparkX GPS-RTK Black
* [SPX-15106](https://www.sparkfun.com/products/15106) - SparkX SAM-M8Q
License Information
-------------------
This product is _**open source**_!
Various bits of the code have different licenses applied. Anything SparkFun wrote is beerware; if you see me (or any other SparkFun employee) at the local, and you've found our code helpful, please buy us a round!
Please use, reuse, and modify these files as you see fit. Please maintain attribution to SparkFun Electronics and release anything derivative under the same license.
Distributed as-is; no warranty is given.
- Your friends at SparkFun.