MSP430F149学习之路——比较器Comparaor_A

代码一：

 1 #include <msp430x14x.h>
 2 int flag = 0;
 3 void int_clk()
 4 {
 5   BCSCTL1 &= ~XT2OFF;
 6   BCSCTL2 |= SELM_2 + SELS;
 7   do
 8   {
 9     IFG1 &= ~OFIFG;
10     for(int i=0;i<100;i++)
11       _NOP();
12   }while((IFG1 & OFIFG)!=0);
13   IFG1 &= ~OFIFG;
14 }
15
16 void int_COMPARATORA()
17 {
18   P2SEL |= BIT3 + BIT4;               //P2.3,P2.4分别作为比较器的输出和输入
19   P2DIR |= BIT3;                      //P2.3作为输出
20
21   CACTL1 &= ~CAEX;
22   CACTL1 |= CARSEL + CAREF_2 + CAON + CAIES + CAIE;
23   CACTL2 |= CAF + P2CA1;              //使能输出滤波器,CA1作为比较器的输入功能
24 }
25 #pragma vector=COMPARATORA_VECTOR
26 __interrupt void COMPARATORA(void)
27 {
28   flag = 1;
29 }
30
31 void main()
32 {
33   WDTCTL = WDTPW + WDTHOLD;
34   P6DIR = 0XFF;
35   P6OUT = 0X00;
36   int_clk();
37   int_COMPARATORA();
38   _EINT();
39   while(1)
40   {
41     while(flag)
42     {
43       P6OUT ^= 0XFF;
44       flag = 0;
45     }
46   }
47 }

代码二：

 1 #include <msp430x14x.h>
 2 void main()
 3 {
 4   WDTCTL = WDTPW + WDTHOLD;
 5   P2SEL |= BIT3;
 6   P1DIR |= BIT2;
 7   P1OUT &= ~BIT2;
 8
 9   CACTL1 = CAEX + CARSEL + CAREF_2 + CAON;
10   CACTL2 = CAF + P2CA1;
11
12   while(1)
13   {
14     if(CAOUT==0)
15       P6OUT = BIT0;
16     else
17       P6OUT = BIT7;
18   }
19 }