timer----C定时器

 滴答定时器中断执行函数，时间到后，执行AlarmList回调函数

//unsigned int----->TickType
TickType				OsTickCounter = 1;	/* zero mask as not started */ 
typedef TickType* TickRefType;

STATIC TickType			 	AlarmTick[ALARM_NUM];
STATIC TickType			 	AlarmPeriod[ALARM_NUM];

void OsTick ( void )
{
	AlarmType AlarmId;
	OsTickCounter ++;

	if(0 == OsTickCounter)
	{
		OsTickCounter = 1;
	}

	for(AlarmId=0; AlarmId<ALARM_NUM; AlarmId++)
	{
		if(AlarmTick[AlarmId] > 0)
		{
			AlarmTick[AlarmId]--;
			if(0u == AlarmTick[AlarmId])
			{
				AlarmList[AlarmId].main();
				AlarmTick[AlarmId] = AlarmPeriod[AlarmId];
			}
		}
	}
}

获取定时器剩余值

unsigned int GetAlarm(AlarmType AlarmId)
{
	asAssert(AlarmId<ALARM_NUM);

	return AlarmTick[AlarmId];
}

设置定时器:
 

int SetRelAlarm ( AlarmType AlarmId, TickType Increment, TickType Cycle )
{
	asAssert(AlarmId<ALARM_NUM);

	AlarmTick[AlarmId] = Increment;
	AlarmPeriod[AlarmId] = Cycle;

	return E_OK;
}

取消定时器：

int CancelAlarm ( AlarmType AlarmId )
{
	asAssert(AlarmId<ALARM_NUM);

	AlarmTick[AlarmId] = 0;
	AlarmPeriod[AlarmId] = 0;

	return E_OK;
}

初始化timer:

void OsAlarmInit ( void )
{
    memset(AlarmTick,0,sizeof(AlarmTick));
    memset(AlarmPeriod,0,sizeof(AlarmPeriod));
}