update Code

libraries/TaskScheduler-master/examples/Scheduler_example04_StatusRequest/Scheduler_example04_StatusRequest.ino

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+/** This test demonstrates interaction between three simple tasks via StatusRequest object.
+ *  Task T1 runs every 5 seconds and signals completion of a status request st.
+ *  Tasks T2 and T3 are waiting on the same request (st)
+ *  Task T3 does not renew its interest in status request st, so it is only invoked once (first iteration)
+ *  Task T2 is invoked every time st completes, because it renews its interest in status of status request object st every iteration of T1
+ */
+ 
+#define _TASK_SLEEP_ON_IDLE_RUN
+#define _TASK_STATUS_REQUEST
+#include <TaskScheduler.h>
+
+StatusRequest st;
+
+Scheduler ts; 
+
+// Callback methods prototypes
+void Callback1();
+void Disable1();
+void Callback2();
+void Callback3();
+void PrepareStatus();
+
+// Tasks
+Task t1(5000, TASK_ONCE, &Callback1, &ts, true, NULL, &Disable1);
+Task t2(&Callback2, &ts);
+Task t3(&Callback3, &ts);
+
+/** T1 callback
+ *  T1 just signals completion of st every 5 seconds
+ */
+void Callback1() {
+  Serial.println("T1: Signaling completion of ST");
+  st.signalComplete();
+}
+
+/** T1 On Disable callback
+ *  This callback renews the status request and restarts T1 delayed to run again in 5 seconds
+ */
+void Disable1() {
+  PrepareStatus();
+  t1.restartDelayed();
+}
+
+/** T2 callback
+ *  Invoked when status request st completes
+ */
+void Callback2() {
+  Serial.println("T2: Invoked due to completion of ST");  
+}
+
+
+/** T3 callback
+ *  Invoked when status request st completes.
+ *  This is only run once since T3 does not renew its interest in the status request st after first iteration
+ */
+ void Callback3() {
+  Serial.println("T3: Invoked due to completion of ST");  
+  
+}
+
+/** Prepare Status request st for another iteration
+ *  
+ */
+void PrepareStatus() {
+  st.setWaiting();         // set the statusrequest object for waiting 
+  t2.waitFor(&st);  // request tasks 1 & 2 to wait on the object st
+}
+
+
+/** Main Arduino code
+ *  Not much to do here. Just init Serial and set the initial status request
+ */
+void setup() {
+
+  Serial.begin(115200);
+  delay(1000);
+  Serial.println("TaskScheduler: Status Request Test 1. Simple Test.");  
+
+  ts.startNow();
+  PrepareStatus();
+  t3.waitFor(&st);
+
+  t1.delay();
+}
+
+void loop() {
+
+  ts.execute();
+
+}