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標題: msp430f5529產生pwm波 [打印本頁]

作者: huicheng 時間: 2018-11-3 12:12
標題: msp430f5529產生pwm波
#include <msp430.h>

/**
* main.c
*/
int pwm_dul = 23;
volatile unsigned int flag =0;
void Keyscan();
int main(void)
{
   WDTCTL = WDTPW + WDTHOLD; // stop watchdog timer
P1DIR |= BIT2;
P1SEL |= BIT2;
P4DIR |= BIT7;
P4OUT &=~BIT7;
P2OUT |= BIT1;
P2REN |= BIT1;

TA0CCR0 = 512-1;
// TA0CCTL1 = OUTMOD_7;
// TA0CCR1 =384;

TA0CTL = TASSEL_1 + MC_1 + TACLR;
// __bis_SR_register(LPM2);
while(1)
{
      Keyscan();
      if(flag!=0)
      {

         P4OUT |= BIT7;
      }
      else
      {
         P4OUT &=~ BIT7;

      }
      TA0CCTL1 = OUTMOD_7;
      TA0CCR1 =pwm_dul;
}

}
void Keyscan()
{
if((P2IN&BIT1) ==0)
{
      __delay_cycles(10000);
      if((P2IN& BIT1)==0)
      {
         while((P2IN& BIT1)==0)
         {
            flag = ~flag;

         }
         pwm_dul = (pwm_dul+4)%300;
      }
}
}

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