MSP430F149学习之路——按键

代码一：

 /**********************************
 程序功能：用按键控制LED灯熄灭
 ***********************************/
 #include <msp430x14x.h>

 void int_clk();
 void main()
 {
   WDTCTL = WDTPW + WDTHOLD;
   int_clk();
   P1DIR = 0Xf0;
   P1OUT = 0Xff;
   P6DIR = 0XFF;
   P6OUT = 0x00;
   while()
   {
     switch(P1IN & 0X0F)
     {
     case 0x0e:P6OUT = 0XC0;break;
     case 0x0d:P6OUT = 0X30;break;
     case 0x0b:P6OUT = 0X0C;break;
     case 0x07:P6OUT = 0X03;break;
     }
   }
 }

 void int_clk()
 {
   BCSCTL1 &= ~XT2OFF;
   BCSCTL2 |= SELM_1 + SELS;
   do
   {
     IFG1 &= ~OFIFG;
     for(int i=;i>;i--)
       _NOP();
   }while((IFG1 & OFIFG)!=);
   IFG1 &= ~OFIFG;
 }

代码二：

 #include <msp430x14x.h>

 void int_clk();
 void delay(int i);
 void main()
 {
   int_clk();
   //initialize IO
   P1DIR = 0XF0;
   P1OUT = 0XFF;
   P6DIR = 0XFF;
   P6OUT = 0XFF;

   if(P1IN != 0X0F)
   {
     delay();
     if(P1IN != 0X0F)
     {
       switch(P1IN & 0X0F)
       {
       case 0x0e:P6OUT = 0XFC;break;
       case 0x0d:P6OUT = 0XF3;break;
       case 0x0b:P6OUT = 0XCF;break;
       case 0x07:P6OUT = 0X3F;break;
       }
     }
   }
   else
     P6OUT = 0XFF;
 }

 void int_clk()
 {
   BCSCTL1 &= ~XT2OFF;
   BCSCTL2 |= SELM_1 + SELS;
   do
   {
     IFG1 &= ~OFIFG;
     for(int i=;i<;i++)
       _NOP();
   }while((IFG1 & OFIFG)!=);
   IFG1 &= ~OFIFG;
 }

 void delay(int i)
 {
   while(i--);
 }