CODEWITHSUNDEEP
cpebble-watchpebble-sdk
alezvic
alezvic

Reputation: 374

Buzz (vibes) at o'clock hours?

Very basic question that I've been trying to figure out by myself for a couple hours but can't solve it.

So I'm creating my first watchface for Pebble and I want the watch to buzz (vibrate) every hour. You remember some digital watches make a "beep" at o'clock times? Well something like that.

I figure it out the most simple way to do it is:

if (tick_time->tm_min == 0) {
    vibes_short_pulse();
}

It works great. Now I have a little bug. During that minute, if the window is re-created (for example, if you go to the timeline or open a watchapp and go back quickly to my watchface) the update_time() is called again so it buzzes again. Not a huge bug but kinda annoying.

I tried to workaround with a boolean flag.

static bool vibed = false;

And then,

if (tick_time->tm_min != 0) {
    vibed = false;
}

if (tick_time->tm_min == 0 && vibed == false) {
    vibes_short_pulse();
    vibed = true;
}

But apparently, everytime the window is re-created the flag goes back to "false" no matter what.

I don't know how to solve it. If you have a hint for me, would be appreciate it. Thanks!

Upvotes: 0

Views: 261

Answers (2)

MotoRidingMelon
MotoRidingMelon

Reputation: 2547

I would just remember the hour of your last buzz. Only buzz if it's different. So:

//initialize to impossible hour so it works the first time
static int lastBuzzHour=-1;
if (tick_time->tm_hour !=lastBuzzHour) {
    vibes_short_pulse();
    // now that you've buzzed, remember it so you don't retrigger
    lastBuzzHour=tick_time->tm_hour;
    }

Upvotes: 0

Yuriy Galanter
Yuriy Galanter

Reputation: 39777

Instead of checking minutes for zero, check for hour change event, e.g.:

void tick_handler(struct tm *tick_time, TimeUnits units_changed)
{

  // Some other code that display/process time  

  // on hour change do a short buzz
  if (units_changed & HOUR_UNIT) {
      vibes_short_pulse();
  }


}

Upvotes: 2

Related Questions