51单片机通过74hc165扩展IO口
网上的程序ourdev_603541AYHA3M.rar(文件大小:47K) (原文件名:water.rar)我从上网找的这个程序,他说可以使用,但是为什么到我硬件上就不能用啦!大家帮忙看看!! #include <reg52.h>
#include <intrins.h>
//下面是引脚的连接以及相关必要的宏定义
sbit io_74hc165_SH_LD = P1^0 ;
sbit io_74hc165_CLK = P1^1 ;
sbit io_74hc165_SDA = P1^2 ;
sbit dat=P3^0;//显示
sbit clk=P3^1;//显示
#define MAX_NUM_74HC165 2
#define NOKEY 0x00
#define KEY_WAIT 0
#define KEY_PRESS 1
#define KEY_CONFIRM 2
#define KEY_WAIT_REALSE 3
#define uint8 unsigned int
#define uchar unsigned char
uchar code tab[]={0x3f,0x06,0x5b,0x4f,0x79,0x6d,0x7F,0x7c,0x71,0x39,0x77,0x1c,0x5e,0x73,0x76,0x40};
// 0 1' 2' 3 E 5, 8, b, f, c, a, u d p, H, -
//165部分
static u8_Read74hc165_f( void )
{
uint8 i, j;
uint8 KeyAddress[ MAX_NUM_74HC165 ] ;
uint8 ReadReturn ;
io_74hc165_SH_LD = 0 ; //锁存并行数据开始
io_74hc165_SDA = 1 ; //准备读串行数据(也起到延时作用)
io_74hc165_SH_LD = 1 ; //锁存并行数据结束
for( j = 0 ; j < MAX_NUM_74HC165 ; j++ )
{
for( i = 8 ; i >= 1 ; i-- )
{
io_74hc165_CLK = 0 ; //时钟拉低
if( io_74hc165_SDA == 0 )break ; //有键按下,数据为1
io_74hc165_CLK = 1 ; //时钟拉高
}
KeyAddress[ j ] = i ; //有键压下,则i的取值在1~8之间,无键压下,i = 0
}
for( j = 0 ; j < MAX_NUM_74HC165 ; j++ )
{
if( KeyAddress[ j ] == 0 ) ReadReturn = 0x00 ;
else
{
ReadReturn = KeyAddress[ j ] + j * 8 ;
break ;
}
}
return ReadReturn ;
}
//下面的这个函数就是读键盘的函数了。
uint8 u8_ReadKeyboard74hc165_f( void )
{
static uint8 KeyState = KEY_WAIT ;
uint8 KeyTemp = NOKEY, KeyValue = NOKEY ;
KeyTemp = u8_Read74hc165_f() ;
switch( KeyState )
{
case KEY_WAIT : if( KeyTemp == NOKEY ) KeyState = KEY_WAIT ;
elseKeyState = KEY_PRESS ; break ;
case KEY_PRESS : if( KeyTemp == NOKEY ) KeyState = KEY_WAIT ;
else KeyState = KEY_CONFIRM ; break ;
case KEY_CONFIRM : if( KeyTemp == NOKEY ) KeyState = KEY_WAIT ;
else
{
KeyState = KEY_WAIT_REALSE ;
KeyValue = KeyTemp ;
} break ;
case KEY_WAIT_REALSE :if( KeyTemp != NOKEY ) KeyState = KEY_WAIT_REALSE ;
else
{
KeyState = KEY_WAIT ;
}break ;
default : break ;
}
return KeyValue ;
}
//164部分
void sendbyte(uchar byte)
{uchar num,i;
num=tab;
for(i=0;i<8;i++)
{dat=num&0x80;
num=num<<1;
clk=0;
clk=1;
}
}
main()
{int i;
while(1)
{sendbyte(u8_ReadKeyboard74hc165_f());
sendbyte(u8_ReadKeyboard74hc165_f());
for(i=0;i<5000;i++)
{//for(j=0;j<50;j++);
}
}}
这个程序我也试过,也一样不行,大虾给我点意见啊! 顶,看看程序还不错啊 好像是仿真不出,查不到原因! 路过! {:2_26:}看看先
页:
[1]