初始化
void TIMER0_INIT(void)
{
        SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);//使能TIMER0
        //TimerConfigure(TIMER0_BASE, TIMER_CFG_ONE_SHOT);//单次计数模式
        //TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC_UP);//周期性计数模式,递增计数
        //TimerConfigure(TIMER0_BASE, TIMER_CFG_SPLIT_PAIR | TIMER_CFG_B_PERIODIC);
        TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);//周期性计数模式
        TimerLoadSet(TIMER0_BASE, TIMER_A,SysCtlClockGet() /12800);
        //TimerADCEventSet(TIMER0_BASE,TIMER_ADC_TIMEOUT_A);//超时触发采样设置
        TimerControlTrigger(TIMER0_BASE,TIMER_A,true);
        //TimerADCEventGet(TIMER0_BASE);//获取是否超时触发ADC
        IntEnable(INT_TIMER0A);//TIMEOUT标志位触发中断
        IntPrioritySet(INT_TIMER0A,1);//优先级1
        TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT); //使能TIMER0A中断
        IntMasterEnable();
        TimerEnable(TIMER0_BASE, TIMER_A);//TIMER0A开始计数，当计数值等于TimerLoadSet，触发中断
}