EVA通用定时器问题

F2812
1、写的PWM波程序，用的是PWM5\6驱动电机，不清楚用比较寄存器产生PWM时与通用定时器有什么关系吗?
2、用定时器产生PWM，发生比较匹配时，发生触变，计数器继续计数直到与周期寄存器值相等，清零。在这个过程中，有中断吗?我现在搞不清楚下面这个程序运行流程，特别是void init_eva(void);之后进入到while()以后，while()为真且为空语句，那么程序是怎么到void init_eva(void);内的呢?
#include "DSP281x_Device.h"     // DSP281x Headerfile Include File
#include "DSP281x_Examples.h"   // DSP281x Examples Include File
void init_eva(void);
void delay();
unsigned int  i,j,k;
unsigned int led[4]={0x01,0x02,0x20,0x40};
void main(void)
{
// Step 1. Initialize System Control:
   InitSysCtrl();
// Step 2. Initalize GPIO:
   EALLOW;
   // Enable PWM pins
   GpioMuxRegs.GPAMUX.all = 0x00FF; // EVA PWM 1-6  pins
   GpioMuxRegs.GPBMUX.all = 0x00FF; // EVB PWM 7-12 pins
   GpioMuxRegs.GPDMUX.all=0x00;
   GpioMuxRegs.GPDDIR.all=0x63;
   GpioMuxRegs.GPDQUAL.all=0x00;
   EDIS;
   
// Step 3. Clear all interrupts and initialize PIE vector table:
   DINT;
   InitPieCtrl();
   IER = 0x0000;
   IFR = 0x0000;
   InitPieVectTable();
//   EvaRegs.EXTCONA.bit.INDCOE=1;
// Step 4. Initialize all the Device Peripherals:
  init_eva();
  init_evb();
// Step 5. User specific code, enable interrupts:
  // Just sit and loop forever:
  // PWM pins can be observed with a scope.
  while(1)
  {
  
   }
void init_eva()
{
// EVA Configure T1PWM, T2PWM, PWM1-PWM6
// Initalize the timers
   // Initalize EVA Timer1
   EvaRegs.T1PR = 0xFFFF;       // Timer1 period
   EvaRegs.T1CMPR = 0x8000;     // Timer1 compare
   EvaRegs.T1CNT = 0x0000;      // Timer1 counter
   // TMODE = continuous up/down
   // Timer enable
   // Timer compare enable
   EvaRegs.T1CON.all = 0x1042;   
  // Initalize EVA Timer2
  EvaRegs.T2PR = 0x0FFF;       // Timer2 period
  EvaRegs.T2CMPR = 0x03C0;     // Timer2 compare
  EvaRegs.T2CNT = 0x0000;      // Timer2 counter
  // TMODE = continuous up/down
  // Timer enable
  // Timer compare enable
  EvaRegs.T2CON.all = 0x1042;   
  // Setup T1PWM and T2PWM
  // Drive T1/T2 PWM by compare logic
  EvaRegs.GPTCONA.bit.TCMPOE = 1;
  // Polarity of GP Timer 1 Compare = Active low
  EvaRegs.GPTCONA.bit.T1PIN = 1;
  // Polarity of GP Timer 2 Compare = Active high
  EvaRegs.GPTCONA.bit.T2PIN = 2;  //2 high 1 low 0 force 0  3 force 1
  // Enable compare for PWM1-PWM6
  EvaRegs.CMPR1 = 0x7FFF;
  EvaRegs.CMPR2 = 0x4000;
  EvaRegs.CMPR3 = 0xC000;
   
  // Compare action control.  Action that takes place
  // on a cmpare event
  // output pin 1 CMPR1 - active high
  // output pin 2 CMPR1 - active low
  // output pin 3 CMPR2 - active high
  // output pin 4 CMPR2 - active low
  // output pin 5 CMPR3 - active high
  // output pin 6 CMPR3 - active low
  EvaRegs.ACTRA.all = 0x0666;
  EvaRegs.DBTCONA.all = 0x0000; // Disable deadband
// EvaRegs.COMCONA.all = 0xA600;
  EvaRegs.COMCONA.all = 0xA6ff;
}
void delay(unsigned int value)
{
for(i=0;i<10000;i++)
{ for(j=0;j<value;j++)  ;}
}