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Timer

 

The mxos RTOS Timer API enables: system timer initialization, start, stop, and destroy functions.

The operating system has at least one timer for generating interrupts, performing task scheduling,

and the like.The operating system needs to know the time, such as the system to read the status of a port at regular intervals.

 

 

 

 

mxos_init_timer Initialize an RTOS timer
mxos_start_timer Start an RTOS timer
mxos_stop_timer Stop a running RTOS timer
mxos_reload_timer Reload a desired RTOS timer
mxos_deinit_timer Destroy an RTOS timer
mxos_is_timer_running Query if an RTOS timer is running

 

 

 

2. os_timer.c code

 

#include "mxos.h"
#define os_timer_log(M, ...) custom_log("OS", M, ##__VA_ARGS__)

mxos_timer_t timer_handle;

void destroy_timer( void );
void alarm( void* arg );

void destroy_timer( void )
{
  mxos_stop_timer( &timer_handle );
  mxos_deinit_timer( &timer_handle );
}

void alarm( void* arg )
{
  int* count = (int*)arg;
  os_timer_log("time is coming,value = %d", (*count)++ );

  if( *count == 10 )
    destroy_timer();
}

int application_start( void )
{
  OSStatus err = kNoErr;
  os_timer_log("timer demo");
  int arg = 0;

  err = mxos_init_timer(&timer_handle, 1000, alarm, &arg);
  require_noerr(err, exit);

  err = mxos_start_timer(&timer_handle);
  require_noerr(err, exit);

  mxos_thread_sleep( mxos_NEVER_TIMEOUT );

exit:
  if( err != kNoErr )
    os_timer_log( "Thread exit with err: %d", err );

  mxos_rtos_delete_thread( NULL );
  return err;
}

 

 

 

♦ Achieve:

 

A timer interrupt of 1 second is created by creating and starting a system timer.

Each time an interrupt is incremented, the variable count is incremented by one until it is incremented to 10,

stopping the timer and destroying it.

 

 

♦ Main function code annotations:

1) Call the mxos API to create an RTOS timer: err = mxos_init_timer(&timer_handle, 1000, alarm, &arg);

2) Call the mxos API to start an RTOS timer: err = mxos_start_timer(&timer_handle);

3) Call the mxos API to stop an RTOS timer: mxos_stop_timer( &timer_handle );

4) Call the mxos API to destroy an RTOS timer: mxos_deinit_timer( &timer_handle );

 

 

 

이상 끝 ~~~

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