102 lines
3.0 KiB
Plaintext
102 lines
3.0 KiB
Plaintext
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// Test code for Adafruit GPS modules using MTK3329/MTK3339 driver
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//
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// This code turns on the LOCUS built-in datalogger. The datalogger
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// turns off when power is lost, so you MUST turn it on every time
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// you want to use it!
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//
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// Tested and works great with the Adafruit Ultimate GPS module
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// using MTK33x9 chipset
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// ------> http://www.adafruit.com/products/746
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// Pick one up today at the Adafruit electronics shop
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// and help support open source hardware & software! -ada
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#include <Adafruit_GPS.h>
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// these are for Arduino 1.0
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#include <SoftwareSerial.h>
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SoftwareSerial mySerial(3, 2);
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// if using Arduino v23 or earlier, uncomment these
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// two lines and comment out the above. You will
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// need to install NewSoftSerial
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// #include <NewSoftSerial.h>
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// NewSoftSerial mySerial(3, 2);
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// Connect the GPS Power pin to 5V
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// Connect the GPS Ground pin to ground
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// Connect the GPS TX (transmit) pin to Digital 3
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// Connect the GPS RX (receive) pin to Digital 2
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Adafruit_GPS GPS(&mySerial);
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// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
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// Set to 'true' if you want to debug and listen to the raw GPS sentences
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#define GPSECHO true
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// this keeps track of whether we're using the interrupt
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// off by default!
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boolean usingInterrupt = false;
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void setup()
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{
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// connect at 115200 so we can read the GPS fast enuf and
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// also spit it out
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Serial.begin(115200);
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Serial.println("Adafruit GPS logging start test!");
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// 9600 NMEA is the default baud rate for MTK - some use 4800
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GPS.begin(9600);
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// You can adjust which sentences to have the module emit, below
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// Default is RMC + GGA
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GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
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// Default is 1 Hz update rate
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GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ);
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// the nice thing about this code is you can have a timer0 interrupt go off
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// every 1 millisecond, and read data from the GPS for you. that makes the
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// loop code a heck of a lot easier!
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useInterrupt(true);
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Serial.print("STARTING LOGGING....");
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if (GPS.LOCUS_StartLogger())
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Serial.println(" STARTED!");
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else
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Serial.println(" no response :(");
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delay(1000);
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}
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void loop() // run over and over again
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{
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// do nothing! all reading and printing is done in the interrupt
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}
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/******************************************************************/
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// Interrupt is called once a millisecond, looks for any new GPS data, and stores it
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SIGNAL(TIMER0_COMPA_vect) {
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char c = GPS.read();
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// if you want to debug, this is a good time to do it!
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if (GPSECHO)
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if (c) UDR0 = c;
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// writing direct to UDR0 is much much faster than Serial.print
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// but only one character can be written at a time.
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}
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void useInterrupt(boolean v) {
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if (v) {
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// Timer0 is already used for millis() - we'll just interrupt somewhere
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// in the middle and call the "Compare A" function above
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OCR0A = 0xAF;
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TIMSK0 |= _BV(OCIE0A);
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usingInterrupt = true;
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} else {
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// do not call the interrupt function COMPA anymore
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TIMSK0 &= ~_BV(OCIE0A);
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usingInterrupt = false;
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}
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}
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