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Added interrupt support 

Added interrupt support to shield_sdlog sketch
This commit is contained in:
driverblock 2014-07-30 09:18:03 -04:00
parent 5f0415ee68
commit defdba557d
1 changed files with 73 additions and 24 deletions
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57
examples/shield_sdlog/shield_sdlog.ino
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@ -26,6 +26,11 @@ Adafruit_GPS GPS(&mySerial);
/* set to true to only log to SD when GPS has a fix, for debugging, keep it false */
#define LOG_FIXONLY 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
// Set the pins used
#define chipSelect 10
#define ledPin 13
@ -46,7 +51,7 @@ uint8_t parseHex(char c) {
// blink out an error code
void error(uint8_t errno) {
/*
/*
if (SD.errorCode()) {
putstring("SD error: ");
Serial.print(card.errorCode(), HEX);
@ -102,10 +107,12 @@ void setup() {
logfile = SD.open(filename, FILE_WRITE);
if( ! logfile ) {
Serial.print("Couldnt create "); Serial.println(filename);
Serial.print("Couldnt create ");
Serial.println(filename);
error(3);
}
Serial.print("Writing to "); Serial.println(filename);
Serial.print("Writing to ");
Serial.println(filename);
// connect to the GPS at the desired rate
GPS.begin(9600);
@ -122,13 +129,54 @@ void setup() {
// Turn off updates on antenna status, if the firmware permits it
GPS.sendCommand(PGCMD_NOANTENNA);
// 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("Ready!");
}
// Interrupt is called once a millisecond, looks for any new GPS data, and stores it
SIGNAL(TIMER0_COMPA_vect) {
char c;
while (mySerial.available())
{
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;
}
}
void loop() {
char c = GPS.read();
char c;
while (mySerial.available())
{
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()) {
@ -161,3 +209,4 @@ void loop() {
/* End code */