stepo BTN2 switches to launcher

apps/stepo/ChangeLog

@@ -1,2 +1,2 @@
 0.01: First version
-0.02: Speeded up first draw, ensure timer is stopped and started depending on screen event
+0.02: Speeded up draw, start stop timer, long press BTN2 to switch to the launcher

apps/stepo/README.md

@@ -10,6 +10,7 @@ A large font watch, displays step count in a doughnut guage and warns of low bat
 - The guage show percentage of steps out of a goal of 10000 steps
 
 
+
 ![](screenshot1.jpg)
 
 - When the battery is less than 25% the doughnut turns red
@@ -17,8 +18,14 @@ A large font watch, displays step count in a doughnut guage and warns of low bat
 ![](screenshot2.jpg)
 
 
-# Notes
+## BTN2 Long press to start the launcher
 
+BTN2 is confiured to respond to a 1.5 second press in order to switch
+to the launcher App. Simply press and hold until you hear a buzz and
+release. This avoids accidently switching out of the watch app when
+clothing catches it.
+
+## Notes
 
 * Uses an arrayBuffer to prepare the doughnut guage. The arrayBuffer
   is 160*160 and is larger than required. The reason for this is that

apps/stepo/app.js

@@ -108,9 +108,40 @@ Bangle.on('lcdPower', function(on) {
     stopTimer();
 });
 
+let firstPress = 0;
+var pressTimer;
+
+// start a timer and buzz whenn held long enough
+function firstPressed() {
+  firstPress = getTime();
+  pressTimer = setInterval(longPressCheck, 1500);
+}
+
+// if you release too soon there is no buzz as timer is cleared
+function thenReleased() {
+  var dur = getTime() - firstPress;
+  if (pressTimer) {
+    clearInterval(pressTimer);
+    pressTimer = undefined;
+  }
+  if ( dur >= 1.5 ) Bangle.showLauncher();
+}
+
+// when you feel the buzzer you know you have done a long press
+function longPressCheck() {
+  Bangle.buzz();
+  if (pressTimer) {
+    clearInterval(pressTimer);
+    pressTimer = undefined;
+  }
+}
+
+// make BTN require a long press (1.5 seconds) to switch to launcher
+setWatch(firstPressed, BTN2,{repeat:true,edge:"rising"});
+setWatch(thenReleased, BTN2,{repeat:true,edge:"falling"});
+
 g.reset();
 g.clear();
 Bangle.loadWidgets();
 Bangle.drawWidgets();
 startTimer();
-setWatch(Bangle.showLauncher, BTN2, {repeat:false,edge:"falling"});