AP_PeriodicProcess: added running() method which tells the caller whether the timer is suspended or not

libraries/AP_PeriodicProcess/AP_PeriodicProcessStub.cpp

@@ -15,5 +15,8 @@ void AP_PeriodicProcessStub::suspend_timer(void) {
 }
 void AP_PeriodicProcessStub::resume_timer(void) {
 }
+bool AP_PeriodicProcessStub::running(void) {
+    return !_suspended;
+}
 void AP_PeriodicProcessStub::run(void) {
 }

libraries/AP_PeriodicProcess/AP_PeriodicProcessStub.h

@@ -16,6 +16,7 @@ public:
     bool                    queue_process(ap_procedure proc);   // queue process to run as soon as possible after any currently running ap_processes complete.  returns true if it ran immediately
     void                    suspend_timer(void);
     void                    resume_timer(void);
+    bool                    running();
     static void             run(void);
 protected:
     static uint8_t          _period;

libraries/AP_PeriodicProcess/AP_TimerProcess.cpp

@@ -96,6 +96,10 @@ void AP_TimerProcess::resume_timer(void)
     _suspended = false;
 }
 
+bool AP_TimerProcess::running(void) {
+    return !_suspended;
+}
+
 void AP_TimerProcess::run(void)
 {
     // we enable the interrupt again immediately and also enable

libraries/AP_PeriodicProcess/AP_TimerProcess.h

@@ -20,6 +20,7 @@ public:
     void                        set_failsafe(ap_procedure proc);
     void                        suspend_timer(void);
     void                        resume_timer(void);
+    bool                        running();
     static void                 run(void);
 protected:
     static uint8_t              _period;

libraries/AP_PeriodicProcess/PeriodicProcess.h

@@ -17,6 +17,7 @@ public:
     virtual bool        queue_process(ap_procedure proc) = 0;   // queue process to run as soon as possible after any currently running ap_processes complete.  returns true if it ran immediately
     virtual void        suspend_timer(void) = 0;
     virtual void        resume_timer(void) = 0;
+    virtual bool        running() = 0;
 };
 
 #endif // __PERIODICPROCESS_H__