Merge pull request #641 from gedankenexperimenter/timer-helper

Add timer helper function
pull/659/head
Jesse Vincent 5 years ago committed by GitHub
commit 6e978db26d
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@ -140,6 +140,28 @@ class Kaleidoscope_ {
return millis_at_cycle_start_;
}
/** Determines if a timer has expired.
*
* This method should be used whenever checking to see if a timeout has been
* reached. It correctly computes timeout values even when integer overflow
* occurs, given a start time and a timeout. It takes two parameters:
*
* - start_time: A timestamp when the timer started, which should be set by
* calling `Kaleidoscope.millisAtCycleStart()`. It can be any integer
* type.
*
* - ttl: The timeout value or interval to check (ttl = "time to live"). The
* timer expires (and `hasTimeExpired()` returns true) when the time that
* has elapsed since `start_time` exceeds this value. It must be an
* integer type that is no bigger than the type of `start_time`.
*/
template <typename _Timestamp, typename _Timeout>
bool hasTimeExpired(_Timestamp start_time, _Timeout ttl) {
_Timestamp current_time = millis_at_cycle_start_;
_Timestamp elapsed_time = current_time - start_time;
return (elapsed_time > ttl);
}
EventHandlerResult onFocusEvent(const char *command) {
return kaleidoscope::Hooks::onFocusEvent(command);
}

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