Merge branch 'mc/cancel-all'

* mc/cancel-all:
  README: document cancel all usage of cancel()
  src:arduino-timer: cancel all version of cancel()

Author: contrem

README.md

@@ -56,6 +56,11 @@ auto task = timer.in(delay, function_to_call);
 timer.cancel(task);
 ```
 
+To **cancel** all *Task*s
+```cpp
+timer.cancel();
+```
+
 Be fancy with **lambdas**
 ```cpp
 timer.in(1000, [](void*) -> bool { return false; });
@@ -116,6 +121,8 @@ every(unsigned long interval, handler_t handler, T opaque = T());
 
 /* Cancel a timer task */
 void cancel(Timer<>::Task &task);
+/* Cancel all tasks */
+void cancel();
 
 /* Returns the ticks until next event, or 0 if none */
 unsigned long ticks();

src/arduino-timer.h

@@ -96,6 +96,16 @@ class Timer {
         task = (Task)NULL;
     }
 
+    /* Cancel all timer tasks */
+    void
+    cancel()
+    {
+        for (size_t i = 0; i < max_tasks; ++i) {
+            struct task * const t = &tasks[i];
+            remove(t);
+        }
+    }
+
     /* Ticks the timer forward - call this function in loop() */
     unsigned long
     tick()