MSP430F149学习之路——按键

代码一：

 1 /**********************************
 2 程序功能：用按键控制LED灯熄灭
 3 ***********************************/
 4 #include <msp430x14x.h>
 5
 6 void int_clk();
 7 void main()
 8 {
 9   WDTCTL = WDTPW + WDTHOLD;
10   int_clk();
11   P1DIR = 0Xf0;
12   P1OUT = 0Xff;
13   P6DIR = 0XFF;
14   P6OUT = 0x00;
15   while(1)
16   {
17     switch(P1IN & 0X0F)
18     {
19     case 0x0e:P6OUT = 0XC0;break;
20     case 0x0d:P6OUT = 0X30;break;
21     case 0x0b:P6OUT = 0X0C;break;
22     case 0x07:P6OUT = 0X03;break;
23     }
24   }
25 }
26
27 void int_clk()
28 {
29   BCSCTL1 &= ~XT2OFF;
30   BCSCTL2 |= SELM_1 + SELS;
31   do
32   {
33     IFG1 &= ~OFIFG;
34     for(int i=100;i>0;i--)
35       _NOP();
36   }while((IFG1 & OFIFG)!=0);
37   IFG1 &= ~OFIFG;
38 }

代码二：

 1 #include <msp430x14x.h>
 2
 3 void int_clk();
 4 void delay(int i);
 5 void main()
 6 {
 7   int_clk();
 8   //initialize IO
 9   P1DIR = 0XF0;
10   P1OUT = 0XFF;
11   P6DIR = 0XFF;
12   P6OUT = 0XFF;
13
14   if(P1IN != 0X0F)
15   {
16     delay(20);
17     if(P1IN != 0X0F)
18     {
19       switch(P1IN & 0X0F)
20       {
21       case 0x0e:P6OUT = 0XFC;break;
22       case 0x0d:P6OUT = 0XF3;break;
23       case 0x0b:P6OUT = 0XCF;break;
24       case 0x07:P6OUT = 0X3F;break;
25       }
26     }
27   }
28   else
29     P6OUT = 0XFF;
30 }
31
32 void int_clk()
33 {
34   BCSCTL1 &= ~XT2OFF;
35   BCSCTL2 |= SELM_1 + SELS;
36   do
37   {
38     IFG1 &= ~OFIFG;
39     for(int i=1;i<100;i++)
40       _NOP();
41   }while((IFG1 & OFIFG)!=0);
42   IFG1 &= ~OFIFG;
43 }
44
45 void delay(int i)
46 {
47   while(i--);
48 }