ch452程序

/************** (C) COPYRIGHT 2012 ZhangYangFan **********

* File Name : ch452.h

* Author : ZhangYangFan

* Version : V1.0

* Date : 03/06/2012

* Description : MCU - AT89S5X , SPI communication

***********************************************************/ #ifndef ch452_h

#define ch452_h

#include

#include

sbit DCLK = P0^0 ; //MCU - OUT

sbit DIN = P0^1 ; //MCU - OUT

sbit LOAD = P0^2 ; //MCU - OUT

sbit DOUT = P0^3 ; //MCU - IN

unsigned char KeyWord=0 ;

void ch452_WriteCmd(unsigned intcmd)

{

unsigned char i ;

LOAD = 0 ;

DOUT = 1 ;

for(i=0;i<12;i++)

{

DIN = cmd& 0x01 ;

DCLK = 0 ;

cmd>>= 1 ;

DCLK = 1;

}

LOAD = 1;

_nop_();_nop_();

_nop_();_nop_();

_nop_();_nop_();

_nop_();_nop_();

_nop_();_nop_();

_nop_();_nop_(); //delay 6us

}

unsigned char ch452_ReadKey(void)

{

unsigned char i,keyw=0,cmd=0x07 ;

LOAD = 0 ;

for(i=0;i<4;i++)

{

DIN = cmd& 0x01 ;

DCLK = 0 ;

cmd>>= 1 ;

DCLK = 1 ;

}

LOAD = 1 ;

for(i=0;i<7;i++)

{

keyw<<= 1 ;

if(DOUT) keyw ++ ;

DCLK = 0 ;

DCLK = 1 ;

}

return keyw;

}

void ch452_KeyBoard(void)

{

unsigned char tempw;

tempw = ch452_ReadKey();

switch(tempw&0x3f)

{

case 0x08:KeyWord ='0' ;break;

case 0x09:KeyWord ='1' ;break;

case 0x0b:KeyWord ='2' ;break;

case 0x0a:KeyWord ='3' ;break;

case 0x00:KeyWord ='4' ;break;

case 0x03:KeyWord ='5' ;break;

case 0x01:KeyWord ='6' ;break;

case 0x02:KeyWord ='7' ;break;

case 0x10:KeyWord ='8' ;break;

case 0x11:KeyWord ='9' ;break;

case 0x13:KeyWord ='A' ;break;

case 0x12:KeyWord ='B' ;break;

case 0x18:KeyWord ='C' ;break;

case 0x19:KeyWord ='D' ;break;

case 0x1b:KeyWord ='E' ;break;

case 0x1a:KeyWord ='F' ;

}

while(0x40&ch452_ReadKey());

}

void ch452_Init(void)

{

DCLK = 1 ;

DIN = 1 ;

LOAD = 1 ;

// DOUT = 1 ;

ch452_WriteCmd(0x201);

ch452_WriteCmd(0x402); }

#endif