Start working on a debug program to test battery life, but it's not finished yet

iot/main/gps.cpp

@@ -11,7 +11,7 @@ void gps_begin() {
 	serial_gps.begin(BAUD_GPS);
 }
 
-TinyGPSLocation gps_location() {
+void gps_fetch() {
 	Serial.print("[gps] Getting location: ");
 	uint32_t ms_last_update = millis();
 	// We WILL discover our location - if it's the last thing we do!
@@ -41,10 +41,14 @@ TinyGPSLocation gps_location() {
 		
 		// Hooray!
 		Serial.println("ok");
-		return gps.location;
+		return;
 	}
 }
 
+TinyGPSPlus gps_info() {
+	return gps;
+}
+
 void gps_end() {
 	Serial.println(F("[warning] Putting the GPS device to sleep isn't implemented yet."));
 }

iot/main/gps.h

@@ -12,11 +12,17 @@
 void gps_begin();
 
 /**
- * Fetches the current location from the GPS device.
+ * Fetches new data from the GPS module.
  * May take a moment, as the GPS device needs time to acquire a satellite fix.
+ */
+void gps_fetch();
+
+/**
+ * Fetches the latest information from the GPS device.
+ * Call gps_fetch() first.
  * @return TinyGPSLocation	The current location.
  */
-TinyGPSLocation gps_location();
+TinyGPSLocation gps_info();
 
 /**
  * Ends the connection to the GPS device and puts it to sleep in order to save 

iot/main/main.ino

@@ -1,5 +1,6 @@
 #include <Arduino.h>
 #include <TinyGPS++.h>
+#include <SD.h>
 
 #include "settings.h"
 #include "random.h"
@@ -16,7 +17,7 @@ void setup() {
 	
 	
 	gps_begin();
-	TinyGPSLocation loc = gps_location();
+	TinyGPSPlus gps_data = gps_location();
 	gps_end();
 	
 	Serial.print("[main] Location: ("); Serial.print(loc.lat()); Serial.print(", "); Serial.print(loc.lng()); Serial.println(")");
@@ -26,6 +27,23 @@ void setup() {
 	Serial.print("[main] id: ");
 	Serial.println(id);
 	
+	store_init(); 
+	store_reading(id, gps_data.location);
+	char debug_message[64];
+	int chars = snprintf(debug_message, 64, "%d-%d-%d %d:%d:%d | %f %f",
+		gps_data.date.year(),
+		gps_data.date.month(),
+		gps_data.date.day(),
+		gps_data.time.hour(),
+		gps_data.time.minute(),
+		gps_data.time.second(),
+		gps_data.location.lat(),
+		gps_data.location.lng(),
+	);
+	store_debug(debug_message, chars);
+	store_close();
+	
+	power_off(); // Doesn't return
 }
 
 void loop() {

iot/main/power.cpp

@@ -12,8 +12,14 @@ void power_gps_standby() {
 }
 
 void power_off() {
+	Serial.println(F("[power] Beginning shutdown sequence"));
+	Serial.println(F("[power] Switching GPS module to standby"));
 	power_gps_standby();
 	
+	Serial.println(F("[power] Signalling TPL5111"));
 	pinMode(PIN_TPL_DONE, OUTPUT);
 	digitalWrite(PIN_TPL_DONE, HIGH);
+	
+	// Wait until we're turned off
+	while(true) delay(100);
 }

iot/main/settings.h

@@ -34,4 +34,8 @@
 // The chip select pin that activates the connection to the microSD card over SPI.
 #define	PIN_SD_SPI_CHIP_SELECT	3
 
+// The filename on the microSD card to store data in.
 #define SD_FILENAME	"data.tsv"
+
+// The filename on the microSD card to store debug information in
+#define SD_FILENAME_DEBUG "debug.log"

iot/main/storage.cpp

@@ -4,6 +4,8 @@
 
 #include "settings.h"
 
+File _debug_handle;
+
 void store_init() {
 	// NOTE: If this doesn't work, then we need to use pinMode() & specify the data pin here instead.
 	if(!SD.begin(PIN_SD_SPI_CHIP_SELECT)) {
@@ -29,6 +31,11 @@ void store_reading(uint32_t id, TinyGPSLocation location) {
 	handle.close();
 }
 
+void store_debug(char* buffer, int size) {
+	File handle = SD.open(SD_FILENAME_DEBUG, FILE_WRITE);
+	
+}
+
 void store_close() {
 	SD.end();
 }

iot/main/storage.h

@@ -9,4 +9,6 @@ void store_init();
 
 void store_reading(uint32_t id, TinyGPSLocation location);
 
+void store_debug(char* buffer, int size);
+
 void store_close();