[RTOS] Updated RtosTimer to use Callback

Updated the RtosTimer class to use Callback in order to be consistent
with the updated Thread class.

Author: neilt6

rtos/rtos/RtosTimer.cpp

@@ -23,19 +23,21 @@
 
 #include <string.h>
 
+#include "mbed.h"
 #include "cmsis_os.h"
 #include "mbed_error.h"
 
 namespace rtos {
 
-RtosTimer::RtosTimer(void (*periodic_task)(void const *argument), os_timer_type type, void *argument) {
+void RtosTimer::constructor(mbed::Callback<void()> func, os_timer_type type) {
 #ifdef CMSIS_OS_RTX
-    _timer.ptimer = periodic_task;
+    _timer.ptimer = (void (*)(const void *))Callback<void()>::thunk;
 
     memset(_timer_data, 0, sizeof(_timer_data));
     _timer.timer = _timer_data;
 #endif
-    _timer_id = osTimerCreate(&_timer, type, argument);
+    _function = func;
+    _timer_id = osTimerCreate(&_timer, type, &_function);
 }
 
 osStatus RtosTimer::start(uint32_t millisec) {

rtos/rtos/RtosTimer.h

@@ -24,6 +24,7 @@
 
 #include <stdint.h>
 #include "cmsis_os.h"
+#include "Callback.h"
 
 namespace rtos {
 
@@ -36,21 +37,30 @@ namespace rtos {
 */
 class RtosTimer {
 public:
-    /** Create and Start timer.
-      @param   task      name of the timer call back function.
+    /** Create timer.
+      @param   func      function to be executed by this timer.
       @param   type      osTimerOnce for one-shot or osTimerPeriodic for periodic behaviour. (default: osTimerPeriodic)
-      @param   argument  argument to the timer call back function. (default: NULL)
     */
-    RtosTimer(void (*task)(void const *argument),
-          os_timer_type type=osTimerPeriodic,
-          void *argument=NULL);
+    RtosTimer(mbed::Callback<void()> func, os_timer_type type=osTimerPeriodic) {
+        constructor(func, type);
+    }
+    
+    /** Create timer.
+      @param   obj       pointer to the object to call the member function on.
+      @param   method    member function to be executed by this timer.
+      @param   type      osTimerOnce for one-shot or osTimerPeriodic for periodic behaviour. (default: osTimerPeriodic)
+    */
+    template <typename T, typename M>
+    RtosTimer(T *obj, M method, os_timer_type type=osTimerPeriodic) {
+        constructor(mbed::Callback<void()>(obj, method), type);
+    }
 
     /** Stop the timer.
       @return  status code that indicates the execution status of the function.
     */
     osStatus stop(void);
 
-    /** start a timer.
+    /** Start the timer.
       @param   millisec  time delay value of the timer.
       @return  status code that indicates the execution status of the function.
     */
@@ -59,6 +69,11 @@ class RtosTimer {
     ~RtosTimer();
 
 private:
+    // Required to share definitions without
+    // delegated constructors
+    void constructor(mbed::Callback<void()> func, os_timer_type type);
+    
+    mbed::Callback<void()> _function;
     osTimerId _timer_id;
     osTimerDef_t _timer;
 #if defined(CMSIS_OS_RTX) && !defined(__MBED_CMSIS_RTOS_CM)