【BLE】CC2541低功耗测试-系统运行篇

1.osal_pwrmgr_powerconserve

描述： osal_pwrmgr_powerconserve()函数低功耗具体的处理函数，可以发现要想支持此功能，必须首先包含POWER_SAVING这个宏。细心的同学发现系统死循环后面会一直调用这个函数。每次调用都会检测Timeout在个Timer事件中的Timeout最小值，比如系统1ms轮训检查Timer是否需要处理，按键事件的Timeout是100，意思就是100ms才会检测是否有按键按下，假如按键事件在Timeout的各个Timer事件中Timeout最小，那么就是说有99ms毫秒不会有按键事件的处理，但是死循环一直在跑，在做无用功，为了解决这个问题，就加入了省电模式。所以说，在检测到Timer时间链表中的Timeout的最小值，假设为next，然后CPU进入休眠模式next毫秒，休眠时间到了苏醒过来就会有Timer事件需要处理这样就可以达到省电的目的。

源文件1： osal_pwrmgr.c
代码段1：

#if defined( POWER_SAVING )/********************************************************************* * @fn      osal_pwrmgr_powerconserve * * @brief   This function is called from the main OSAL loop when there are *          no events scheduled and shouldn't be called from anywhere else. * * @param   none. * * @return  none. */void osal_pwrmgr_powerconserve( void ){  uint32        next;  halIntState_t intState;  // Should we even look into power conservation  //首先检查是否允许进入低功耗的处理  if ( pwrmgr_attribute.pwrmgr_device != PWRMGR_ALWAYS_ON )  {    // Are all tasks in agreement to conserve    //是否所有的任务支持低功耗功能    if ( pwrmgr_attribute.pwrmgr_task_state == 0 )    {      // Hold off interrupts.      HAL_ENTER_CRITICAL_SECTION( intState );      // Get next time-out      //查询软件定时器链表的溢出时间间隔      next = osal_next_timeout();      // Re-enable interrupts.      HAL_EXIT_CRITICAL_SECTION( intState );      // Put the processor into sleep mode      OSAL_SET_CPU_INTO_SLEEP( next );    }  }}#endif /* POWER_SAVING */

源文件2： osal.c
代码段2：

void osal_run_system( void ){  uint8 idx = 0;  #if defined (WDT_USED)  WD_KICK();  #endif#ifndef HAL_BOARD_CC2538  osalTimeUpdate();#endif  Hal_ProcessPoll();  do {    if (tasksEvents[idx])  // Task is highest priority that is ready.    {      break;    }  } while (++idx < tasksCnt);  if (idx < tasksCnt)  {    uint16 events;    halIntState_t intState;    HAL_ENTER_CRITICAL_SECTION(intState);    events = tasksEvents[idx];    tasksEvents[idx] = 0;  // Clear the Events for this task.    HAL_EXIT_CRITICAL_SECTION(intState);    activeTaskID = idx;    events = (tasksArr[idx])( idx, events );    activeTaskID = TASK_NO_TASK;    HAL_ENTER_CRITICAL_SECTION(intState);    tasksEvents[idx] |= events;  // Add back unprocessed events to the current task.    HAL_EXIT_CRITICAL_SECTION(intState);  }#if defined( POWER_SAVING )  else  // Complete pass through all task events with no activity?  {    osal_pwrmgr_powerconserve();  // Put the processor/system into sleep  }#endif  /* Yield in case cooperative scheduling is being used. */#if defined (configUSE_PREEMPTION) && (configUSE_PREEMPTION == 0)  {    osal_task_yield();  }#endif}