void time_init()
{
   SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);   //使能定时器
//   SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER1);
//   SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER2);
   TimerConfigure(TIMER0_BASE,TIMER_CFG_16_BIT_PAIR|TIMER_CFG_A_PERIODIC|TIMER_CFG_B_PERIODIC); //配置模式TIMER_CFG_32_BIT_PER      
   TimerPrescaleSet(TIMER0_BASE,TIMER_A,199); //200分频
   TimerPrescaleSet(TIMER0_BASE,TIMER_B,99); //100分频
   TimerLoadSet(TIMER0_BASE, TIMER_A, 40000UL);    //设定加载值
   TimerLoadSet(TIMER0_BASE, TIMER_B, 40000UL);
//   TimerControlTrigger(TIMER0_BASE,TIMER_A,true);   //使能触发ADC
//   TimerControlEvent(TIMER0_BASE,TIMER_A,TIMER_EVENT_POS_EDGE);//正边沿触发
//  TimerControlLevel(TIMER0_BASE,TIMER_A,false);   //PWM电平
TimerIntEnable(TIMER0_BASE,TIMER_TIMA_TIMEOUT);   //使能中断
  TimerIntEnable(TIMER0_BASE,TIMER_TIMB_TIMEOUT);
     IntEnable(INT_TIMER0A);
     IntEnable(INT_TIMER0B);
//   IntEnable(INT_TIMER1A);
//   IntEnable(INT_TIMER1B);
//   IntEnable(INT_TIMER2A);
//   IntEnable(INT_TIMER2B);

  main函数中开总中断   

问题是进不了中断    32位模式下周期计数是能进中断的 此帖出自小平头技术问答