39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
#pragma once
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#include <SoftwareSerial.h>
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#include "settings.h"
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// A lightweight struct to hold location information.
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// TinyGPS++ actually uses a *ton* of RAM so we can't keep the instance around as a global variable
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// FUTURE: Rewrite this to use TinyGPS's integer system instead?
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struct GPSLocation {
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float lat;
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float lng;
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#ifdef SD_DEBUG_ENABLED
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char time[20];
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#endif
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};
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/**
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* Initialises the connection to the GPS device.
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*/
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SoftwareSerial gps_begin();
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/**
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* Fetches new data from the GPS module.
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* May take a moment, as the GPS device needs time to acquire a satellite fix.
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*/
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GPSLocation gps_fetch();
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/**
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* Ends the connection to the GPS device and puts it to sleep in order to save
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* power.
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* Note that the GPS device is connected directly to the power management
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* system and so doesn't get turned off after each measurement, as it takes
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* ~30s to reacquire a lock when it first starts up - hence why we put it to
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* sleep instead.
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* TODO: Connect the gps module to the timed power rail instead, as its; got an onboard battery.
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*/
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void gps_end(SoftwareSerial gps);
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