Merge commit '5f0415ee68876e1ef1a7b13f9d835a496475a39e'

* commit '5f0415ee68876e1ef1a7b13f9d835a496475a39e':
  Correcting name of download button
  Fixed Leo Locus examples
  fix bad commit
  Due support
  Add support for Arduino Due
  Add #include <SPI.h>

Adafruit_GPS.cpp

@@ -164,10 +164,13 @@ char Adafruit_GPS::read(void) {
   
   if (paused) return c;
 
+#ifdef __AVR__
   if(gpsSwSerial) {
     if(!gpsSwSerial->available()) return c;
     c = gpsSwSerial->read();
-  } else {
+  } else 
+#endif
+  {
     if(!gpsHwSerial->available()) return c;
     c = gpsHwSerial->read();
   }
@@ -203,6 +206,7 @@ char Adafruit_GPS::read(void) {
   return c;
 }
 
+#ifdef __AVR__
 // Constructor when using SoftwareSerial or NewSoftSerial
 #if ARDUINO >= 100
 Adafruit_GPS::Adafruit_GPS(SoftwareSerial *ser)
@@ -213,6 +217,7 @@ Adafruit_GPS::Adafruit_GPS(NewSoftSerial *ser)
   common_init();     // Set everything to common state, then...
   gpsSwSerial = ser; // ...override gpsSwSerial with value passed.
 }
+#endif
 
 // Constructor when using HardwareSerial
 Adafruit_GPS::Adafruit_GPS(HardwareSerial *ser) {
@@ -222,7 +227,9 @@ Adafruit_GPS::Adafruit_GPS(HardwareSerial *ser) {
 
 // Initialization code used by all constructor types
 void Adafruit_GPS::common_init(void) {
+#ifdef __AVR__
   gpsSwSerial = NULL; // Set both to NULL, then override correct
+#endif
   gpsHwSerial = NULL; // port pointer in corresponding constructor
   recvdflag   = false;
   paused      = false;
@@ -241,15 +248,23 @@ void Adafruit_GPS::common_init(void) {
 
 void Adafruit_GPS::begin(uint16_t baud)
 {
-  if(gpsSwSerial) gpsSwSerial->begin(baud);
+#ifdef __AVR__
-  else            gpsHwSerial->begin(baud);
+  if(gpsSwSerial) 
+    gpsSwSerial->begin(baud);
+  else 
+    gpsHwSerial->begin(baud);
+#endif
 
   delay(10);
 }
 
 void Adafruit_GPS::sendCommand(char *str) {
-  if(gpsSwSerial) gpsSwSerial->println(str);
+#ifdef __AVR__
-  else            gpsHwSerial->println(str);
+  if(gpsSwSerial) 
+    gpsSwSerial->println(str);
+  else    
+#endif
+    gpsHwSerial->println(str);
 }
 
 boolean Adafruit_GPS::newNMEAreceived(void) {

Adafruit_GPS.h

@@ -20,10 +20,12 @@ All text above must be included in any redistribution
 #ifndef _ADAFRUIT_GPS_H
 #define _ADAFRUIT_GPS_H
 
-#if ARDUINO >= 100
+#ifdef __AVR__
- #include <SoftwareSerial.h>
+  #if ARDUINO >= 100
-#else
+    #include <SoftwareSerial.h>
- #include <NewSoftSerial.h>
+  #else
+    #include <NewSoftSerial.h>
+  #endif
 #endif
 
 // different commands to set the update rate from once a second (1 Hz) to 10 times a second (10Hz)
@@ -65,14 +67,14 @@ All text above must be included in any redistribution
 
 // request for updates on antenna status 
 #define PGCMD_ANTENNA "$PGCMD,33,1*6C" 
-#define PGCMD_NOANTENNA "$PGCMD,33,0*6D" 
+#define PGCMD_NOANTENNA "$PGCMD,33,0*6C" 
 
 // how long to wait when we're looking for a response
 #define MAXWAITSENTENCE 5
 
 #if ARDUINO >= 100
  #include "Arduino.h"
-#if !defined(__AVR_ATmega32U4__)
+#if defined (__AVR__) && !defined(__AVR_ATmega32U4__)
  #include "SoftwareSerial.h"
 #endif
 #else
@@ -85,10 +87,12 @@ class Adafruit_GPS {
  public:
   void begin(uint16_t baud); 
 
-#if ARDUINO >= 100 
+#ifdef __AVR__
-  Adafruit_GPS(SoftwareSerial *ser); // Constructor when using SoftwareSerial
+  #if ARDUINO >= 100 
-#else
+    Adafruit_GPS(SoftwareSerial *ser); // Constructor when using SoftwareSerial
-  Adafruit_GPS(NewSoftSerial  *ser); // Constructor when using NewSoftSerial
+  #else
+    Adafruit_GPS(NewSoftSerial  *ser); // Constructor when using NewSoftSerial
+  #endif
 #endif
   Adafruit_GPS(HardwareSerial *ser); // Constructor when using HardwareSerial
 
@@ -106,7 +110,7 @@ class Adafruit_GPS {
   void interruptReads(boolean r);
 
   boolean wakeup(void);
- boolean standby(void);
+  boolean standby(void);
 
   uint8_t hour, minute, seconds, year, month, day;
   uint16_t milliseconds;
@@ -127,10 +131,12 @@ class Adafruit_GPS {
   boolean paused;
   
   uint8_t parseResponse(char *response);
-#if ARDUINO >= 100
+#ifdef __AVR__
-  SoftwareSerial *gpsSwSerial;
+  #if ARDUINO >= 100
-#else
+    SoftwareSerial *gpsSwSerial;
-  NewSoftSerial  *gpsSwSerial;
+  #else
+    NewSoftSerial  *gpsSwSerial;
+  #endif
 #endif
   HardwareSerial *gpsHwSerial;
 };

README.txt

@@ -16,6 +16,6 @@ Written by Limor Fried/Ladyada  for Adafruit Industries.
 BSD license, check license.txt for more information
 All text above must be included in any redistribution
 
-To download. click the DOWNLOADS button in the top right corner, rename the uncompressed folder Adafruit_GPS. Check that the Adafruit_GPS folder contains Adafruit_GPS.cpp and Adafruit_GPS.h
+To download. click the "Download ZIP" at the right side, extract the archive and rename the uncompressed folder Adafruit_GPS. Check that the Adafruit_GPS folder contains Adafruit_GPS.cpp and Adafruit_GPS.h
 
-Place the Adafruit_GPS library folder your <arduinosketchfolder>/libraries/ folder. You may need to create the libraries subfolder if its your first library. Restart the IDE.
+Place the Adafruit_GPS library folder your <arduinosketchfolder>/libraries/ folder. You may need to create the libraries subfolder if its your first library. Restart the IDE.

examples/due_parsing/due_parsing.ino

@@ -0,0 +1,178 @@
+// Test code for Adafruit GPS modules using MTK3329/MTK3339 driver
+//
+// This code shows how to listen to the GPS module in an interrupt
+// which allows the program to have more 'freedom' - just parse
+// when a new NMEA sentence is available! Then access data when
+// desired.
+//
+// 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
+
+#include <Adafruit_GPS.h>
+
+#ifdef __AVR__
+  #include <SoftwareSerial.h>
+#endif
+
+// If you're using a GPS module:
+// 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 3
+//   Connect the GPS RX (receive) pin to Digital 2
+// If using hardware serial (e.g. Arduino Mega):
+//   Connect the GPS TX (transmit) pin to Arduino RX1, RX2 or RX3
+//   Connect the GPS RX (receive) pin to matching TX1, TX2 or TX3
+
+// If you're using the Adafruit GPS shield, change 
+// SoftwareSerial mySerial(3, 2); -> SoftwareSerial mySerial(8, 7);
+// and make sure the switch is set to SoftSerial
+
+// If using software serial, keep this line enabled
+// (you can change the pin numbers to match your wiring):
+//SoftwareSerial mySerial(3, 2);
+
+// If using hardware serial (e.g. Arduino Mega, Leonardo, Due), comment
+// out the above  line and enable this line instead:
+#define mySerial Serial1
+
+Adafruit_GPS GPS(&mySerial);
+
+
+// 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 enough and echo without dropping chars
+  // also spit it out
+  Serial.begin(115200);
+  Serial.println("Adafruit GPS library basic test!");
+
+  // 9600 NMEA is the default baud rate for Adafruit MTK GPS's- some use 4800
+  GPS.begin(9600);
+  mySerial.begin(9600);
+  
+  // uncomment this line to turn on RMC (recommended minimum) and GGA (fix data) including altitude
+  GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
+  // uncomment this line to turn on only the "minimum recommended" data
+  //GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCONLY);
+  // For parsing data, we don't suggest using anything but either RMC only or RMC+GGA since
+  // the parser doesn't care about other sentences at this time
+  
+  // Set the update rate
+  GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ);   // 1 Hz update rate
+  // For the parsing code to work nicely and have time to sort thru the data, and
+  // print it out we don't suggest using anything higher than 1 Hz
+
+  // Request updates on antenna status, comment out to keep quiet
+  GPS.sendCommand(PGCMD_ANTENNA);
+
+  // 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!
+
+#ifdef __arm__
+  usingInterrupt = false;  //NOTE - we don't want to use interrupts on the Due
+#else
+  useInterrupt(true);
+#endif
+
+  delay(1000);
+  // Ask for firmware version
+  mySerial.println(PMTK_Q_RELEASE);
+}
+
+#ifdef __AVR__
+// 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!
+#ifdef UDR0
+  if (GPSECHO)
+    if (c) UDR0 = c;  
+    // writing direct to UDR0 is much much faster than Serial.print 
+    // but only one character can be written at a time. 
+#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;
+  }
+}
+#endif //#ifdef__AVR__
+
+uint32_t timer = millis();
+void loop()                     // run over and over again
+{
+  // in case you are not using the interrupt above, you'll
+  // need to 'hand query' the GPS, not suggested :(
+  if (! usingInterrupt) {
+    // read data from the GPS in the 'main loop'
+    char c = GPS.read();
+    // if you want to debug, this is a good time to do it!
+    if (GPSECHO)
+      if (c) Serial.print(c);
+  }
+  
+  // if a sentence is received, we can check the checksum, parse it...
+  if (GPS.newNMEAreceived()) {
+    // a tricky thing here is if we print the NMEA sentence, or data
+    // we end up not listening and catching other sentences! 
+    // so be very wary if using OUTPUT_ALLDATA and trytng to print out data
+    //Serial.println(GPS.lastNMEA());   // this also sets the newNMEAreceived() flag to false
+  
+    if (!GPS.parse(GPS.lastNMEA()))   // this also sets the newNMEAreceived() flag to false
+      return;  // we can fail to parse a sentence in which case we should just wait for another
+  }
+
+  // if millis() or timer wraps around, we'll just reset it
+  if (timer > millis())  timer = millis();
+
+  // approximately every 2 seconds or so, print out the current stats
+  if (millis() - timer > 2000) { 
+    timer = millis(); // reset the timer
+    
+    Serial.print("\nTime: ");
+    Serial.print(GPS.hour, DEC); Serial.print(':');
+    Serial.print(GPS.minute, DEC); Serial.print(':');
+    Serial.print(GPS.seconds, DEC); Serial.print('.');
+    Serial.println(GPS.milliseconds);
+    Serial.print("Date: ");
+    Serial.print(GPS.day, DEC); Serial.print('/');
+    Serial.print(GPS.month, DEC); Serial.print("/20");
+    Serial.println(GPS.year, DEC);
+    Serial.print("Fix: "); Serial.print((int)GPS.fix);
+    Serial.print(" quality: "); Serial.println((int)GPS.fixquality); 
+    if (GPS.fix) {
+      Serial.print("Location: ");
+      Serial.print(GPS.latitude, 4); Serial.print(GPS.lat);
+      Serial.print(", "); 
+      Serial.print(GPS.longitude, 4); Serial.println(GPS.lon);
+      
+      Serial.print("Speed (knots): "); Serial.println(GPS.speed);
+      Serial.print("Angle: "); Serial.println(GPS.angle);
+      Serial.print("Altitude: "); Serial.println(GPS.altitude);
+      Serial.print("Satellites: "); Serial.println((int)GPS.satellites);
+    }
+  }
+}

examples/due_shield_sdlog/due_shield_sdlog.ino

@@ -0,0 +1,174 @@
+
+#include <Adafruit_GPS.h>
+
+#ifdef __AVR__
+  #include <SoftwareSerial.h>
+  #include <avr/sleep.h>
+#endif
+
+#include <SPI.h>
+#include <SD.h>
+
+
+// Ladyada's logger modified by Bill Greiman to use the SdFat library
+//
+// This code shows how to listen to the GPS module in an interrupt
+// which allows the program to have more 'freedom' - just parse
+// when a new NMEA sentence is available! Then access data when
+// desired.
+//
+// Tested and works great with the Adafruit Ultimate GPS Shield
+// using MTK33x9 chipset
+//    ------> http://www.adafruit.com/products/
+// Pick one up today at the Adafruit electronics shop 
+// and help support open source hardware & software! -ada
+
+#ifdef __AVR__
+SoftwareSerial mySerial(8, 7);
+#else
+#define mySerial Serial1
+#endif
+
+Adafruit_GPS GPS(&mySerial);
+
+// 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
+/* set to true to only log to SD when GPS has a fix, for debugging, keep it false */
+#define LOG_FIXONLY false  
+
+// Set the pins used
+#define chipSelect 10
+#define ledPin 13
+
+File logfile;
+
+// read a Hex value and return the decimal equivalent
+uint8_t parseHex(char c) {
+  if (c < '0')
+    return 0;
+  if (c <= '9')
+    return c - '0';
+  if (c < 'A')
+    return 0;
+  if (c <= 'F')
+    return (c - 'A')+10;
+}
+
+// blink out an error code
+void error(uint8_t errno) {
+/*
+  if (SD.errorCode()) {
+    putstring("SD error: ");
+    Serial.print(card.errorCode(), HEX);
+    Serial.print(',');
+    Serial.println(card.errorData(), HEX);
+  }
+  */
+  while(1) {
+    uint8_t i;
+    for (i=0; i<errno; i++) {
+      digitalWrite(ledPin, HIGH);
+      delay(100);
+      digitalWrite(ledPin, LOW);
+      delay(100);
+    }
+    for (i=errno; i<10; i++) {
+      delay(200);
+    }
+  }
+}
+
+void setup() {
+  // for Leonardos, if you want to debug SD issues, uncomment this line
+  // to see serial output
+  //while (!Serial);
+  
+  // connect at 115200 so we can read the GPS fast enough and echo without dropping chars
+  // also spit it out
+  Serial.begin(115200);
+  Serial.println("\r\nUltimate GPSlogger Shield");
+  pinMode(ledPin, OUTPUT);
+
+  // make sure that the default chip select pin is set to
+  // output, even if you don't use it:
+  pinMode(10, OUTPUT);
+  
+  // see if the card is present and can be initialized:
+  if (!SD.begin(chipSelect, 11, 12, 13)) {
+  //if (!SD.begin(chipSelect)) {      // if you're using an UNO, you can use this line instead
+    Serial.println("Card init. failed!");
+    error(2);
+  }
+  char filename[15];
+  strcpy(filename, "GPSLOG00.TXT");
+  for (uint8_t i = 0; i < 100; i++) {
+    filename[6] = '0' + i/10;
+    filename[7] = '0' + i%10;
+    // create if does not exist, do not open existing, write, sync after write
+    if (! SD.exists(filename)) {
+      break;
+    }
+  }
+
+  logfile = SD.open(filename, FILE_WRITE);
+  if( ! logfile ) {
+    Serial.print("Couldnt create "); Serial.println(filename);
+    error(3);
+  }
+  Serial.print("Writing to "); Serial.println(filename);
+  
+  // connect to the GPS at the desired rate
+  GPS.begin(9600);
+
+  // uncomment this line to turn on RMC (recommended minimum) and GGA (fix data) including altitude
+  GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
+  // uncomment this line to turn on only the "minimum recommended" data
+  //GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCONLY);
+  // For logging data, we don't suggest using anything but either RMC only or RMC+GGA
+  // to keep the log files at a reasonable size
+  // Set the update rate
+  GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ);   // 1 or 5 Hz update rate
+
+  // Turn off updates on antenna status, if the firmware permits it
+  GPS.sendCommand(PGCMD_NOANTENNA);
+  
+  Serial.println("Ready!");
+}
+
+void loop() {
+  char c = GPS.read();
+  if (GPSECHO)
+     if (c)   Serial.print(c);
+
+  // if a sentence is received, we can check the checksum, parse it...
+  if (GPS.newNMEAreceived()) {
+    // a tricky thing here is if we print the NMEA sentence, or data
+    // we end up not listening and catching other sentences! 
+    // so be very wary if using OUTPUT_ALLDATA and trying to print out data
+    //Serial.println(GPS.lastNMEA());   // this also sets the newNMEAreceived() flag to false
+        
+    if (!GPS.parse(GPS.lastNMEA()))   // this also sets the newNMEAreceived() flag to false
+      return;  // we can fail to parse a sentence in which case we should just wait for another
+    
+    // Sentence parsed! 
+    Serial.println("OK");
+    if (LOG_FIXONLY && !GPS.fix) {
+        Serial.print("No Fix");
+        return;
+    }
+
+    // Rad. lets log it!
+    Serial.println("Log");
+    
+    char *stringptr = GPS.lastNMEA();
+    uint8_t stringsize = strlen(stringptr);
+    if (stringsize != logfile.write((uint8_t *)stringptr, stringsize))    //write the string to the SD file
+      error(4);
+    if (strstr(stringptr, "RMC"))   logfile.flush();
+    Serial.println();
+  }
+}
+
+
+/* End code */

examples/leo_locus_dumpbasic/leo_locus_dumpbasic.ino

@@ -36,10 +36,11 @@ HardwareSerial mySerial = Serial1;
 
 void setup()  
 {    
+//  while (!Serial);  // Leonardo will wait till serial connects
+
   // connect at 115200 so we can read the GPS fast enuf and
   // also spit it out
   Serial.begin(115200);
-  delay(2000);
   Serial.println("Adafruit GPS logging start test!");
 
   // 9600 NMEA is the default baud rate for MTK - some use 4800
@@ -58,8 +59,16 @@ void setup()
 
 void loop()                     // run over and over again
 {  
+  // If using hardware serial (e.g. Arduino Mega), change this to Serial1, etc.
   if (mySerial.available()) {
-    Serial.write(mySerial.read());  
+    char c = mySerial.read();
+    if (c) {
+#ifdef UDR0
+      UDR0 = c;  
+#else
+      Serial.print(c);
+#endif
+    }
   }
 }
 

examples/leo_locus_erase/leo_locus_erase.ino

@@ -32,19 +32,33 @@
 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  false
+
+// 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()  
 {    
+  while (!Serial) ;  //wait for serial port on Leonardo
+  
   // connect at 115200 so we can read the GPS fast enuf and
   // also spit it out
   Serial.begin(115200);
-  delay(2000);
   Serial.println("Adafruit GPS erase FLASH!");
 
   // 9600 NMEA is the default baud rate for MTK
   GPS.begin(9600);
   
   GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_OFF);
-  
+
+  // 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);
 
   Serial.println("This code will ERASE the data log stored in the FLASH - Permanently!");
   Serial.print("Are you sure you want to do this? [Y/N]: ");
@@ -62,3 +76,34 @@ void loop()                     // run over and over again
   }
 }
 
+/******************************************************************/
+// 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;
+  }
+}
+
+

examples/leo_locus_start/leo_locus_start.ino

@@ -37,12 +37,18 @@ HardwareSerial mySerial = Serial1;
 // 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);
-  delay(2000);
+  while (!Serial);
+  delay(1000);
   Serial.println("Adafruit GPS logging start test!");
 
   // 9600 NMEA is the default baud rate for MTK - some use 4800
@@ -54,6 +60,10 @@ void setup()
   // 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())
@@ -65,9 +75,38 @@ void setup()
 
 void loop()                     // run over and over again
 {
-  char c = GPS.read();
+   // do nothing! all reading and printing is done in the interrupt
-  // if you want to debug, this is a good time to do it!
-  if ((c) && (GPSECHO))
-    Serial.write(c);  
 }
 
+/******************************************************************/
+
+// 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;
+  }
+}
+
+

examples/leo_locus_status/leo_locus_status.ino

@@ -38,12 +38,18 @@ HardwareSerial mySerial = Serial1;
 // Set to 'true' if you want to debug and listen to the raw GPS sentences
 #define GPSECHO  false
 
+// 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()  
 {    
+  while (!Serial);  // the Leonardo will 'wait' until the USB plug is connected
+
   // connect at 115200 so we can read the GPS fast enuf and
   // also spit it out
   Serial.begin(115200);
-  delay(5000);
   Serial.println("Adafruit GPS logging start test!");
 
   // 9600 NMEA is the default baud rate for MTK - some use 4800
@@ -55,6 +61,11 @@ void setup()
   // 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);
+
   while (true) {
     Serial.print("Starting logging....");
     if (GPS.LOCUS_StartLogger()) {
@@ -110,4 +121,35 @@ void loop()                     // run over and over again
 }//loop
 
 
+/******************************************************************/
+// 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. 
+#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;
+  }
+}
+
+
+
 

examples/shield_sdlog/shield_sdlog.ino

@@ -1,4 +1,4 @@
-
+#include <SPI.h>
 #include <Adafruit_GPS.h>
 #include <SoftwareSerial.h>
 #include <SD.h>
@@ -160,4 +160,4 @@ void loop() {
 }
 
 
-/* End code */
+/* End code */