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支持键盘双击事件的C程序设计！
作者：李佰战
/**********************************************************************************
KeyBoard Encode Program
This Program can encode press_key up to 128 and it can deal
KB_DBClick Message
This is just a test proram and only use 2 key.If More Key need to
Encode ,please
modify the function:KBKeyPress()
This Porgram use Message_Driver method,the KB_Msg is used to
record what KB_Msg has occured.
The meaning of 'SysKBMsg' is list as following.
Program Design:LiBaizhan
Ver:1.10
Date:2003-3-16
************************************************************************************/
＃i nclude <reg51.h>
＃i nclude <intrins.h>
sbit Key1 = P1^0;
sbit Key2 = P1^1;
/*
Some System Var Pre_Definition
Crystal Frequence is 11.0592MHz
*/
#define TIME_2MS 0X74
#define TIME_20MS 0X043B
#define KB_INTERNAL 3 /*Key DBClk Detection Internal
*/
/*
SysKBMsg define Keyboard Message,it include Single_Click or
Double_Click
It's bit6~bit0 record key_encode and bit 7 record DBClk(1) or SglClk(0)
It can record and encode up to 127(2^7-1) keys
No key is press when it is 0
This method did not deal key such as Ctrl_Key or Alt_Key or
Shift_Key...etc.
*/
/*_________________________________________________*/
data unsigned char SysKBMsg=0; /*| 7 | 6 | 5 | 4 | 3 | 2 |
1 | 0 |*/
/*| D/S | KB6 | KB5 | KB4 | KB3 | KB2 |
KB1 | KB0 |*/
data unsigned char KBCounter=0;
bit KBCounterStart=0;
bit KBCounterStop=0; /*if KeyBoard counter stop then this bit
is 1*/
bit KBCounterFlag=0; /*Current Counter is used by KeyBoard*/
void TimerInt0(void) interrupt 1 /*timer 0 interrupt use to record
how long key is press*/
{
TR0=0;
if(KBCounterFlag) /*Current Counter is used by KeyBoard*/
{
if(KBCounter<KB_INTERNAL) /*if DBClk Detection is not finish then
detect continue*/
{
KBCounter++;
TR0=1;
}
else
{
KBCounter=0; /*DBClk Detection is finish*/
KBCounterStop=1;
}
}
}
void DelayMS(unsigned int dltime);
void Init51(void);
unsigned char KBKeyPress(void); /*only return what key is press*/
void KBKeyEncode(void); /*encode which key is pressed and
DBClk or SglClk*/
void KBStartTimer(unsigned char CntH,unsigned char CntL); /*load
counter initial value and start timer*/
void KBStopTimer(void);
void KBDealPressKey(void); /*deal key_press message*/
void main(void)
{
Init51();
while(1)
{
KBKeyEncode(); /*recored what KeyBoard Msg
occure:which key is press and single clk or db clk*/
KBDealPressKey();
}
}
/*
Delay Time is :(20+17*dl_time)*12/CrystalFrequence(us)
*/
void DelayMS(unsigned int dltime)
{
unsigned int i;
for(i=0;i<dltime;i++);
}
void Init51(void)
{
SCON = 0x50; /* mode 1: 8-bit UART, enable
receiver */
TMOD = 0x21; /* timer 1 mode 2: 8-Bit reload
*/
/* timer 0 mode 1: 16-bit Timer
*/
TH1 = BAUD_4800; /* reload value 9600 baud
*/
TR1 = 1; /* timer 1 run
*/
IE = 0X12; /* enable Serial INT,Timer0 INT
*/
ES = 0; /* disable Serial INT*/
EA = 1; /* Open INT Ctrl
*/
}
void KBKeyEncode(void)
{
data unsigned char CurrPress=0,LastPress=0;
if((LastPress=KBKeyPress())!=0) /*if some key is press
then start encode*/
{
KBStartTimer(0,0); /*some key is press then
start DBClk Detection Counter*/
SysKBMsg=LastPress; /*record the key that is
pressed this time*/
while(!KBCounterStop)
{
if((CurrPress=KBKeyPress())!=0X0) /*if some key is pressed
during DBClk Detection then jump out to see wether DBclk is occured*/
break;
}
if((KBCounterStop==0)&&(LastPress==CurrPress)) /*this key
DBClk occured*/
SysKBMsg|=0X80;
KBStopTimer();
}
}
unsigned char KBKeyPress(void)
{
data unsigned char KeyPress=0;
if((P1&0X03)!=0X03)
{
DelayMS(TIME_20MS);
if((KeyPress=(P1&0X03))!=0X03) /*some key is press*/
{
if(KBCounterStart)
TR0=0;
while((P1&0X03)!=0X03); /*wait until key is free*/
DelayMS(TIME_20MS);
if(KBCounterStart)
TR0=1;
}
else /*Key is not real press*/
{
KeyPress=0;
}
}
return KeyPress;
}
void KBStartTimer(unsigned char CntH,unsigned char CntL)
{
TR0=0;
TH0=CntH;
TR0=1; /*Start Counter*/
TL0=CntL;
KBCounterFlag=1; /*this counter is used by KeyBoard*/
KBCounterStart=1;
KBCounterStop=0;
}
void KBStopTimer(void)
{
TR0=0;
TH0=0;
TL0=0;
KBCounter=0;
KBCounterFlag=0;
KBCounterStart=0;
}
void KBDealPressKey(void)
{
data unsigned char tmp=0;
switch(SysKBMsg) /*here is just a test program,test to deal
Sgl_Clk and DB_Clk Msg*/
{
case 0X01: tmp=0X01;break;
case 0X02: tmp=0X02;break;
case 0X81: tmp=0X81;break;
case 0X82: tmp=0X82;break;
default : break;
}
SysKBMsg=0; /*this key msg has been
done*/
}
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