adding what's needed to enable the softdevice and the power off function

Author: jpconstantineau

libraries/Bluefruit52Lib/examples/Hardware/blink_sleep/blink_sleep.ino

@@ -1,6 +1,7 @@
 /*
   Blink_sleep
   Turns on an LED on for one second, then off for one second, until the time to go to sleep runs out.
+  You can wake up the feather by pressing a key/switch connecting the WAKE_LOW_PIN to GND and the WAKE_HIGH_PIN to 3.3V (VCC)
 
   Based on the blinky arduino example 
   
@@ -10,6 +11,7 @@
   by Pierre Constantineau
 
 */
+#include <bluefruit.h>
 
 #define WAKE_LOW_PIN  PIN_A0
 #define WAKE_HIGH_PIN PIN_A1
@@ -22,11 +24,11 @@ void gotoSleep(unsigned long time)
   if ((time>SLEEPING_DELAY))
   {
     // to reduce power consumption when sleeping, turn off all your LEDs (and other power hungry devices)
-    digitalwrite(LED_BUILTIN, LOW);                     
+    digitalWrite(LED_BUILTIN, LOW);                     
 
     // setup your wake-up pins.
-    pinModeSense(WAKE_LOW_PIN,  INPUT_PULLUP_SENSE);    // this pin (WAKE_LOW_PIN) is pulled up and wakes up the feather when externally connected to ground.
-    pinModeSense(WAKE_HIGH_PIN, INPUT_PULLDOWN_SENSE);  // this pin (WAKE_HIGH_PIN) is pulled down and wakes up the feather when externally connected to 3.3v.
+    pinMode(WAKE_LOW_PIN,  INPUT_PULLUP_SENSE);    // this pin (WAKE_LOW_PIN) is pulled up and wakes up the feather when externally connected to ground.
+    pinMode(WAKE_HIGH_PIN, INPUT_PULLDOWN_SENSE);  // this pin (WAKE_HIGH_PIN) is pulled down and wakes up the feather when externally connected to 3.3v.
 
     // power down nrf52.
     sd_power_system_off();                              // this function puts the whole nRF52 to deep sleep (no Bluetooth).  If no sense pins are setup (or other hardware interrupts), the nrf52 will not wake up.
@@ -35,6 +37,8 @@ void gotoSleep(unsigned long time)
 
 // the setup function runs once when you press reset or power the board
 void setup() {
+  Bluefruit.begin();          // Sleep functions need the softdevice to be active.
+
   // initialize digital pin LED_BUILTIN as an output.
   pinMode(LED_BUILTIN, OUTPUT);
 }