?? key.c
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//============================================================================
//按鍵測試程序,按下S2-S5在LCD上分別顯示1-4
//實驗時短接J5的1,2引腳(LCD背光控制引腳)
//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include <c8051f320.h> // SFR declarations
#include <INTRINS.H>
#include <stdio.h>
#define SYSCLK 120000000 // SYSCLK frequency in Hz
sbit key1=P2^0;
sbit key2=P2^1;
sbit key3=P2^2;
sbit key4=P2^3;
unsigned long q;
//--------------------------------
void YJ_Init(void);
void SPI0_Init (void);
void Write_CHAR(unsigned char yjchar);
unsigned char key_in(void);
//-----------------------------------------------------
void delay(void)
{
int a=1000;
while(a!=0)
{
a--;
}
}
/*----------------------------------------------------*/
//按鍵連接到p2.0、p2.1、p2.2、P2.3,均為開漏輸出
unsigned char key_in(void)
{
XBR0 =0X00;
P2=0xff;
if(key1==0)
{
key1=1;
delay();//延時
if(key1==0)
{
while(key1==0);
XBR0 =0X02;
return(0x31);//返回字符"1"表示按鍵SW1按下
}
}
if(key2==0)
{
key2=1;
delay();//延時
if(key2==0)
{
while(key2==0);
XBR0 =0X02;
return(0x32);//返回字符"3"表示按鍵SW1按下
}
}
if(key3==0)
{
key3=1;
delay();//延時
if(key3==0)
{
while(key3==0);
XBR0 =0X02;
return(0x33);//返回字符"3"表示按鍵SW1按下
}
}
if(key4==0)
{
key4=1;
delay();//延時
if(key4==0)
{
while(key4==0);
XBR0 =0X02;
return(0x34);//返回字符"4"表示按鍵SW1按下
}
}
XBR0 =0X02;
return(0);//返回0,表示沒有按鍵按下
}
//---------------------------------------------
void main(void)
{
unsigned char data1;
PCA0MD &= ~0x40; // WDTE = 0 (watchdog timer enable bit)
OSCICN |= 0x83; // Set internal oscillator to highest
// setting (24500000)
P0SKIP = 0xFC;;
XBR0 = 0x02;; // Enable SMBus pins
XBR1 = 0x40; // Enable crossbar and weak pull-ups
P0MDOUT = 0xFF; // All P0 pins open-drain output
P1MDOUT = 0xFF;
P2MDOUT = 0xFF;
P3MDOUT |= 0x04; // P3.3 push-pull output
SPI0_Init ();
YJ_Init();
while(1)
{
data1=key_in(); //讀按鍵
if(data1!=0) //有按鍵按下,顯示對應的按鍵
{
YJ_Init(); //LCD初始化
//準備送數據
for(q=0;q<1000;q++);
Write_CHAR(data1); //控制LCD
for(q=0;q<1000;q++);
}
}
}
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