1 // Test code for Adafruit GPS modules using MTK3329/MTK3339 driver
3 // This code turns on the LOCUS built-in datalogger. The datalogger
4 // turns off when power is lost, so you MUST turn it on every time
7 // Tested and works great with the Adafruit Ultimate GPS module
8 // using MTK33x9 chipset
9 // ------> http://www.adafruit.com/products/746
10 // Pick one up today at the Adafruit electronics shop
11 // and help support open source hardware & software! -ada
13 #include <Adafruit_GPS.h>
15 #include <SoftwareSerial.h>
17 // Older Arduino IDE requires NewSoftSerial, download from:
18 // http://arduiniana.org/libraries/newsoftserial/
19 // #include <NewSoftSerial.h>
20 // DO NOT install NewSoftSerial if using Arduino 1.0 or later!
23 // Connect the GPS Power pin to 5V
24 // Connect the GPS Ground pin to ground
25 // If using software serial (sketch example default):
26 // Connect the GPS TX (transmit) pin to Digital 3
27 // Connect the GPS RX (receive) pin to Digital 2
28 // If using hardware serial (e.g. Arduino Mega):
29 // Connect the GPS TX (transmit) pin to Arduino RX1, RX2 or RX3
30 // Connect the GPS RX (receive) pin to matching TX1, TX2 or TX3
32 // If using software serial, keep these lines enabled
33 // (you can change the pin numbers to match your wiring):
35 SoftwareSerial mySerial(3, 2);
37 NewSoftSerial mySerial(3, 2);
39 Adafruit_GPS GPS(&mySerial);
40 // If using hardware serial (e.g. Arduino Mega), comment
41 // out the above six lines and enable this line instead:
42 //Adafruit_GPS GPS(&Serial1);
45 // Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
46 // Set to 'true' if you want to debug and listen to the raw GPS sentences
49 // this keeps track of whether we're using the interrupt
51 boolean usingInterrupt = false;
52 void useInterrupt(boolean); // Func prototype keeps Arduino 0023 happy
56 while (!Serial); // the Leonardo will 'wait' until the USB plug is connected
58 // connect at 115200 so we can read the GPS fast enuf and
61 Serial.println("Adafruit GPS logging start test!");
63 // 9600 NMEA is the default baud rate for MTK - some use 4800
66 // You can adjust which sentences to have the module emit, below
67 // Default is RMC + GGA
68 GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
69 // Default is 1 Hz update rate
70 GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ);
72 // the nice thing about this code is you can have a timer0 interrupt go off
73 // every 1 millisecond, and read data from the GPS for you. that makes the
74 // loop code a heck of a lot easier!
77 Serial.print("\nSTARTING LOGGING....");
78 if (GPS.LOCUS_StartLogger())
79 Serial.println(" STARTED!");
81 Serial.println(" no response :(");
87 void loop() // run over and over again
89 // do nothing! all reading and printing is done in the interrupt
92 /******************************************************************/
94 // Interrupt is called once a millisecond, looks for any new GPS data, and stores it
95 SIGNAL(TIMER0_COMPA_vect) {
97 // if you want to debug, this is a good time to do it!
101 // writing direct to UDR0 is much much faster than Serial.print
102 // but only one character can be written at a time.
107 void useInterrupt(boolean v) {
109 // Timer0 is already used for millis() - we'll just interrupt somewhere
110 // in the middle and call the "Compare A" function above
112 TIMSK0 |= _BV(OCIE0A);
113 usingInterrupt = true;
115 // do not call the interrupt function COMPA anymore
116 TIMSK0 &= ~_BV(OCIE0A);
117 usingInterrupt = false;