C:UsersThinkPadDesktop

#include "MSP430G2553.h"
#include "math.h"
#define uchar unsigned char
#define uint unsigned int
unsigned char i;
unsigned int j=1,n=0,flot=0;
unsigned int spwm[50]= {
40,120,200,279,357,434,508,581,652,719,
785,846,905,960,1011,1059,1101,1140,1174,
1205,1229,1249,1264,1274,1279,1279,1274,1264,
1249,1229,1205,1174,1140,1101,1059,1011,960,
905,846,785,719,652,581,508,434,357,279,
200,120,40
};
void ini_sys(void);//时钟初始化
void TimerA_lnit();//定时器初始化
int main( void )
{
  // Stop watchdog timer to prevent time out reset
  WDTCTL = WDTPW + WDTHOLD;
  ini_sys();//时钟初始化
  TimerA_lnit();//定时器初始化
  _EINT();
  while(1);
}
#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A(void)
{
  n++;
  if(flot==1)
  {
    TACCR1=spwm[n];
      TACCR2=0;   
    if(n==49)
    {
      n=0;
      flot=0;
    }   
  }
  else
  {
    TACCR2=spwm[n];
    TACCR1=0;
   if(n==49)
    {
      n=0;
      flot=1;
    }
  }
  P1IFG=0;
}
void TimerA_lnit()
{
  P1SEL|=BIT2+BIT6;
  P1DIR|=BIT2+BIT6;
  TACTL=TACLR+MC_1+TASSEL_2;  
  TACCR0=1600;
  TACCR1=TACCR2=spwm[n];
  TACCTL1=OUTMOD_6;
  TACCTL2=OUTMOD_6;
  TACCTL0|=CCIE;
}
void ini_sys(void)
{
BCSCTL2=SELM_1+DIVM_0;
BCSCTL1=CALBC1_8MHZ;
DCOCTL=CALDCO_8MHZ;
}
输出后第一个和最后一个波形发现了翻转现象，不知哪里出问题