Implement initial power management functions.

Next up, we need to test it to see how long it'll last on a battery.

iot/main/power.cpp

@@ -0,0 +1,19 @@
+#include <Arduino.h>
+
+#include "settings.h"
+
+
+void power_gps_wakeup() {
+	Serial.println("Warn: GPS wakeup isn't implemented yet.");
+}
+
+void power_gps_standby() {
+	Serial.println("Warn: GPS standby isn't implemented yet.");
+}
+
+void power_off() {
+	power_gps_standby();
+	
+	pinMode(PIN_TPL_DONE, OUTPUT);
+	digitalWrite(PIN_TPL_DONE, HIGH);
+}

iot/main/power.h

@@ -0,0 +1,15 @@
+
+/**
+ * Wakes the GPS module up from standby.
+ */
+void power_gps_wakeup();
+/**
+ * Puts the GPS module into standby.
+ */
+void power_gps_standby();
+
+/**
+ * Signals that our work is complete and that we can turn off now to the 
+ * TPL5111.
+ */
+void power_off();

iot/main/settings.h

@@ -10,6 +10,8 @@
 // Multiple devices can use the same SPI data pin AFAIKT, but some libraries *cough* SD *cough* are too stupid to figure out which pin it is on their own.
 #define PIN_SPI_DATA	9
 
+#define PIN_TPL_DONE	8
+
 /////////////////////////////////
 ////////////// GPS //////////////
 /////////////////////////////////