First commit, working build.

lib/Adafruit-GPS-Library/examples/leo_locus_start/leo_locus_start.ino

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+// Test code for Adafruit GPS modules using MTK3329/MTK3339 driver
+//
+// This code turns on the LOCUS built-in datalogger. The datalogger
+// turns off when power is lost, so you MUST turn it on every time
+// you want to use it!
+//
+// Tested and works great with the Adafruit Ultimate GPS module
+// using MTK33x9 chipset
+//    ------> http://www.adafruit.com/products/746
+// Pick one up today at the Adafruit electronics shop 
+// and help support open source hardware & software! -ada
+//This code is intended for use with Arduino Leonardo and other ATmega32U4-based Arduinos
+
+#include <Adafruit_GPS.h>
+#include <SoftwareSerial.h>
+
+// Connect the GPS Power pin to 5V
+// Connect the GPS Ground pin to ground
+// If using software serial (sketch example default):
+//   Connect the GPS TX (transmit) pin to Digital 8
+//   Connect the GPS RX (receive) pin to Digital 7
+// If using hardware serial:
+//   Connect the GPS TX (transmit) pin to Arduino RX1 (Digital 0)
+//   Connect the GPS RX (receive) pin to matching TX1 (Digital 1)
+
+// If using software serial, keep these lines enabled
+// (you can change the pin numbers to match your wiring):
+//SoftwareSerial mySerial(8, 7);
+//Adafruit_GPS GPS(&mySerial);
+
+// If using hardware serial, comment
+// out the above two lines and enable these two lines instead:
+Adafruit_GPS GPS(&Serial1);
+HardwareSerial mySerial = Serial1;
+
+// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
+// Set to 'true' if you want to debug and listen to the raw GPS sentences
+#define GPSECHO  true
+
+// this keeps track of whether we're using the interrupt
+// off by default!
+boolean usingInterrupt = false;
+void useInterrupt(boolean); // Func prototype keeps Arduino 0023 happy
+
+void setup()  
+{    
+  // connect at 115200 so we can read the GPS fast enuf and
+  // also spit it out
+  Serial.begin(115200);
+  while (!Serial);
+  delay(1000);
+  Serial.println("Adafruit GPS logging start test!");
+
+  // 9600 NMEA is the default baud rate for MTK - some use 4800
+  GPS.begin(9600);
+  
+  // You can adjust which sentences to have the module emit, below
+  // Default is RMC + GGA
+  GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
+  // Default is 1 Hz update rate
+  GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ);
+
+  // the nice thing about this code is you can have a timer0 interrupt go off
+  // every 1 millisecond, and read data from the GPS for you. that makes the
+  // loop code a heck of a lot easier!
+  useInterrupt(true);
+  delay(500);
+  Serial.print("\nSTARTING LOGGING....");
+  if (GPS.LOCUS_StartLogger())
+    Serial.println(" STARTED!");
+  else
+    Serial.println(" no response :(");
+  delay(1000);
+}
+
+void loop()                     // run over and over again
+{
+   // do nothing! all reading and printing is done in the interrupt
+}
+
+/******************************************************************/
+
+// Interrupt is called once a millisecond, looks for any new GPS data, and stores it
+SIGNAL(TIMER0_COMPA_vect) {
+  char c = GPS.read();
+  // if you want to debug, this is a good time to do it!
+  if (GPSECHO && c) {
+#ifdef UDR0
+    UDR0 = c;  
+    // writing direct to UDR0 is much much faster than Serial.print 
+    // but only one character can be written at a time. 
+#else
+    Serial.write(c);
+#endif
+  }
+}
+
+void useInterrupt(boolean v) {
+  if (v) {
+    // Timer0 is already used for millis() - we'll just interrupt somewhere
+    // in the middle and call the "Compare A" function above
+    OCR0A = 0xAF;
+    TIMSK0 |= _BV(OCIE0A);
+    usingInterrupt = true;
+  } else {
+    // do not call the interrupt function COMPA anymore
+    TIMSK0 &= ~_BV(OCIE0A);
+    usingInterrupt = false;
+  }
+}
+
+