common.c

键盘扫描程序

#include "common.h"
#include <intrins.h>
#include "def.h"

unsigned char code led[20]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0xbf,0x89,0x8C}; 


void delay_ms(int n)
{
  unsigned  int  j,k;
  for(k=0;k<n;k++)
  for(j=0;j<1000;j++);
}

void delay_m(void)
{
  delay_ms(0x10);
}

void send(unsigned char a)
{
	unsigned char i;
	for(i=0;i<8;i++)
		{
			if(_crol_(a,i)&0x80)
				SDA=1;
			else
				SDA=0;
			CLK=0;
			CLK=1;
		}
}	

void	display(unsigned char display)
	{
		//unsigned	char	display_bit;
		unsigned	char	k;
		//display_bit=0x7f;
		k=led[display];
		send(k);
		P1=0x3f;
		delay_m();
		P1=0xff;
		//display_bit=0x7f;
	}