#include "cmsis_os2.h"                                        // CMSIS RTOS header file
 
/*----------------------------------------------------------------------------
 *  Event Flags creation & usage
 *---------------------------------------------------------------------------*/
 
void Thread_EventSender   (void *argument);                   // thread function 1
void Thread_EventReceiver (void *argument);                   // thread function 2
osThreadId_t tid_Thread_EventSender;                          // thread id 1
osThreadId_t tid_Thread_EventReceiver;                        // thread id 2
 
osEventFlagsId_t evt_id;                                      // message queue id
 
#define FLAGS_MSK1 0x00000001ul
 
int Init_Events (void)
{
  tid_Thread_EventSender = osThreadNew (Thread_EventSender, NULL, NULL);
  if (tid_Thread_EventSender == NULL) {
    return(-1);
  }
  tid_Thread_EventReceiver = osThreadNew (Thread_EventReceiver, NULL, NULL);
  if (tid_Thread_EventReceiver == NULL) {
    return(-1);
  }

  return(0);
}
 
void Thread_EventSender (void *argument)
{
  evt_id = osEventFlagsNew(NULL);
  while (1) {    
    osEventFlagsSet(evt_id, FLAGS_MSK1);
    osThreadYield ();                                         // suspend thread
  }
}
 
void Thread_EventReceiver (void *argument)
{
  uint32_t  flags;
 
  while (1) {
    flags = osEventFlagsWait (evt_id,FLAGS_MSK1,osFlagsWaitAny, osWaitForever);
    //handle event
 
  }
}