55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
#include "gps.h"
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#include "settings.h"
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// The GPS message decoder
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TinyGPSPlus gps;
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// The serial connection to the GPS device
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SoftwareSerial serial_gps(PIN_GPS_RX, PIN_GPS_TX);
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void gps_begin() {
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// Initialise the software-based serial connection to the GPS device
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serial_gps.begin(BAUD_GPS);
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}
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void gps_fetch() {
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Serial.print("[gps] Getting location: ");
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uint32_t ms_last_update = millis();
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// We WILL discover our location - if it's the last thing we do!
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while(true) {
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if(millis() > 5000 && gps.charsProcessed() < 10) {
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Serial.println(F("\n[error] Failed to initialise GPS device."));
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while(true) { delay(1); }
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}
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// Make sure there's something to read
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if(serial_gps.available() <= 0) {
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continue;
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}
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// If it failed, go around again
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if(!gps.encode(serial_gps.read()))
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continue;
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// If we haven't acquired a lock yet, go around again
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// Also go around again if the location is the same hasn't yet been updated (GPS devices are strange)
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if(!gps.location.isValid()) {
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// NOTE: It can really take a rather long time to get a lock. Just wait patiently :-)
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if(millis() - ms_last_update > 500) Serial.print(".");
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ms_last_update = millis();
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continue;
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}
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// Hooray!
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Serial.println("ok");
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return;
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}
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}
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TinyGPSPlus gps_info() {
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return gps;
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}
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void gps_end() {
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Serial.println(F("[warning] Putting the GPS device to sleep isn't implemented yet."));
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}
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