原创 8255简单应用

https://static.assets-stash.eet-china.com/album/old-resources/2009/1/29/c9dd719b-4afc-4e9a-ae63-17ff2386f5ab.rar" target=_blank>             0x90, //10010000b, c=out   b="out"  a="in"
             0x82, //10000010b, c=out   b="in"   a="out"
             0x92, //10010010b, c=out   b="in"   a="in"
             0x89, //10001001b, c=in    b="out"  a="out"
             0x99, //10011001b, c=in    b="out"  a="in"
             0x8B, //10001011b, c=in    b="in"   a="out"
             0x9B, //10011011b, c=in    b="in"   a="in"
          };

/*--------------------------------------------------------------*/
//设置工作方式
/*
void SetMode(unsigned char mode)
{
 CWR = mode;
}
*/

/*--------------------------------------------------------------*/
//复位CWR
void ResetMode(void)
{
 CWR = 0x00;
}

/*--------------------------------------------------------------*/
//指定端口写入数据
/*
void WR_8255(unsigned char add, unsigned char dat)
{
 if(add == 0)   PortA = dat;
 else if(add == 1) PortB = dat;
 else      PortC = dat;
}
*/

/*--------------------------------------------------------------*/
//指定端口读出数据
/*
unsigned char RD_8255(unsigned char add)
{
 unsigned char dat; 
 if(add == 0)  dat = PortA;
 else if(add == 1) dat = PortB;
 else    dat = PortC;
 return(dat);
}
*/

/*--------------------------------------------------------------*/
//函数运用演示1
/*
//延时500000+0us 函数定义
void delay500ms(void)
{
    unsigned char i,j,k;
    for(i=205;i>0;i--)
    for(j=116;j>0;j--)
    for(k=9;k>0;k--);
}

void main(void)
{
 SetMode(mode_8255[0]);
 while(1)
 {
  WR_8255(0, 0xff);
  delay500ms();
  WR_8255(0, 0x00);
  delay500ms();
 }
}
*/

/*--------------------------------------------------------------*/
//函数运用演示2
/*
void main(void)
{ 
 unsigned char k = 0x01;
 unsigned char i;
 CWR = mode_8255[0];
 while(1)
 {
  PortA = k;
  delay500ms();
  k <<= 1; i++;
  if(i == 8) {k = 0x01; i = 0;}
 }
}
*/

#endif