EALLOW;GpioCtrlRegs.GPBMUX1.bit.GPIO34 = 0;GpioCtrlRegs.GPBDIR.bit.GPIO34 = 1;EDIS;

struct CPUTIMER_VARS {volatile struct  CPUTIMER_REGS  *RegsAddr;//定时器 相关寄存器Uint32    InterruptCount;    //用作定时器中断次数统计float   CPUFreqInMHz;       //存放频率 单位MHZfloat   PeriodInUSec;      //中断的计数值 ，到了产生中断。
};

struct CPUTIMER_REGS {union TIM_GROUP TIM;   // Timer counter register  定时器计数寄存器union PRD_GROUP PRD;   // Period register         定时器周期寄存器  union TCR_REG   TCR;   // Timer control register  定时器控制寄存器Uint16          rsvd1; // reserved                保留union TPR_REG   TPR;   // Timer pre-scale low         union TPRH_REG  TPRH;  // Timer pre-scale high
};

void ConfigCpuTimer(struct CPUTIMER_VARS *Timer, float Freq, float Period)
{Uint32  temp;// Initialize timer period:Timer->CPUFreqInMHz = Freq;Timer->PeriodInUSec = Period;temp = (long) (Freq * Period);Timer->RegsAddr->PRD.all = temp;// Set pre-scale counter to divide by 1 (SYSCLKOUT):Timer->RegsAddr->TPR.all  = 0;Timer->RegsAddr->TPRH.all  = 0;// Initialize timer control register:Timer->RegsAddr->TCR.bit.TSS = 1;      // 1 = Stop timer, 0 = Start/Restart TimerTimer->RegsAddr->TCR.bit.TRB = 1;      // 1 = reload timerTimer->RegsAddr->TCR.bit.SOFT = 1;Timer->RegsAddr->TCR.bit.FREE = 1;     // Timer Free RunTimer->RegsAddr->TCR.bit.TIE = 1;      // 0 = Disable/ 1 = Enable Timer Interrupt// Reset interrupt counter:Timer->InterruptCount = 0;
}

　 ConfigCpuTimer(&CpuTimer0, 150, 1000000);//使用定时器0  ，时钟频率为150MHZ，计数值 到1M  。也就是说这样设置是产生一个一秒的中断

PieVectTable.TINT0 = &cpu_timer0_isr;//往中断矢量表中填写一个指针。当定时时间到了就跳转到 ，当前指针指向的函数去执行代码。