MSP430 单片机矩阵键盘程序

3万 · 2015-12-21 19:28

基于io中断实现的矩阵键盘程序

#include <MSP430X44X.H>

unsigned char Key_Num=0 ;

void time_delay(void) ;

void Display_Num(void) ;

void Key_Process(void) ;

void main()

{

WDTCTL = WDTPW + WDTHOLD ; //停止看门狗

P4OUT = 0X00 ; 

P4DIR |= 0X08 ;



P1DIR = 0X00 ; //将P1定义为输入

P1DIR |= 0X0E ; //将P1.1~P1.3定义为输出

P1OUT = 0X00 ; //P1.1~P1.3输出为0



P1IE = 0X00 ; 

P1IES = 0X00 ; 

P1IFG = 0X00 ; 



P1IE |= 0X0E ; //P1允许中断

P1IES |= 0X0E ; 

_EINT() ; //系统中断允许

while(1) ;



}

#pragma vector = PORT1_VECTOR

__interrupt void port1(void)

{

time_delay () ; //软件消抖

if((P1IN&0XF0) != 0XF0 ) //有键按下

{

Key_Process () ;

P1IFG = 0X00 ;

P1OUT = 0X0E ;

Display_Num () ;



}

}



void time_delay (void) 

{

unsigned int i =1 ;

while (i--) ;

}

void Display_Num(void)

{

P4OUT = 0X08 ;

}



void Key_Process(void)

{

P1OUT=0XEF; //P1.4 OUT 0

if((P1IN & 0X02) == 0X00) Key_Num = 1 ;

if((P1IN & 0X04) == 0X00) Key_Num = 2 ;

if((P1IN & 0X08) == 0X00) Key_Num = 3 ;

P1OUT=0XDF; //P1.5 OUT 0

if((P1IN & 0X02) == 0X00) Key_Num = 4 ;

if((P1IN & 0X04) == 0X00) Key_Num = 5 ;

if((P1IN & 0X08) == 0X00) Key_Num = 6 ;

P1OUT=0XBF; //P1.6 OUT 0

if((P1IN & 0X02) == 0X00) Key_Num = 7 ;

if((P1IN & 0X04) == 0X00) Key_Num = 8 ;

if((P1IN & 0X08) == 0X00) Key_Num = 9 ;

P1OUT=0X7F; //P1.7 OUT 0

if((P1IN & 0X02) == 0X00) Key_Num = 10 ;

if((P1IN & 0X04) == 0X00) Key_Num = 11 ;

if((P1IN & 0X08) == 0X00) Key_Num = 12 ;

}