MSP430F149学习之路——比较器Comparaor_A

代码一：

#include <msp430x14x.h>
int flag = 0;
void int_clk()
{
  BCSCTL1 &= ~XT2OFF;
  BCSCTL2 |= SELM_2 + SELS;
  do
  {
    IFG1 &= ~OFIFG;
    for(int i=0;i<100;i++)
      _NOP();
  }while((IFG1 & OFIFG)!=0);
  IFG1 &= ~OFIFG;
}

void int_COMPARATORA()
{
  P2SEL |= BIT3 + BIT4;               //P2.3,P2.4分别作为比较器的输出和输入
  P2DIR |= BIT3;                      //P2.3作为输出
  
  CACTL1 &= ~CAEX;
  CACTL1 |= CARSEL + CAREF_2 + CAON + CAIES + CAIE;
  CACTL2 |= CAF + P2CA1;              //使能输出滤波器,CA1作为比较器的输入功能
}
#pragma vector=COMPARATORA_VECTOR
__interrupt void COMPARATORA(void)
{
  flag = 1;
}

void main()
{
  WDTCTL = WDTPW + WDTHOLD;
  P6DIR = 0XFF;
  P6OUT = 0X00;
  int_clk();
  int_COMPARATORA();
  _EINT();
  while(1)
  {
    while(flag)
    {
      P6OUT ^= 0XFF;
      flag = 0;
    }
  }
}

代码二：

#include <msp430x14x.h>
void main()
{
  WDTCTL = WDTPW + WDTHOLD;
  P2SEL |= BIT3;
  P1DIR |= BIT2;
  P1OUT &= ~BIT2;
  
  CACTL1 = CAEX + CARSEL + CAREF_2 + CAON;
  CACTL2 = CAF + P2CA1;
  
  while(1)
  {
    if(CAOUT==0)
      P6OUT = BIT0;
    else
      P6OUT = BIT7;
  }
}