ctrl.c

这是广西大学生设计大赛的源码

#include "ctrl.h"
#include <REGX51.H>
#include "keyboard.h"


#define CTRL_A  P3_1
#define CTRL_B  P3_2
#define CTRL_C  P3_3


BYTE ctrlGetInputABC(void)
{
 CTRL_A = 1;
 if (CTRL_A)
 {
  DelayX1ms(50);
  while (CTRL_A) ;
  DelayX1ms(50);
  return 'A';
 }

 CTRL_B = 1;
 if (CTRL_B)
 {
  DelayX1ms(50);
  while (CTRL_B) ;
  DelayX1ms(50);
  return 'B';
 }

 CTRL_C = 1;
 if (CTRL_C)
 {
  DelayX1ms(50);
  while (CTRL_C) ;
  DelayX1ms(50);
  return 'C';
 }

 return 0;
}