📄 key.lst
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C51 COMPILER V8.02 KEY 03/12/2009 22:02:28 PAGE 1
C51 COMPILER V8.02, COMPILATION OF MODULE KEY
OBJECT MODULE PLACED IN Key.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE Key.c BROWSE DEBUG OBJECTEXTEND
line level source
1 #include "REG52.H"
2 #include "Key.h"
3 #define OS_LONG_KEY_EN 1//如果应用中需要处理长按键动作，则定义为1，否则定义为0（如果应用中不需要处理长按动
-作，则建议定义为0，以节省代码空间）
4
5 /***********************************************
6 功能说明：按键驱动扫描
7 入口参数：无
8 出口参数：扫描一次键盘以获得按键句柄
9 注：交OSReadKey（）函数调用
10 需要根据实际硬件的键盘接口修改
11 ***********************************************/
12 unsigned char OSScanKey(void)
13 {
14 1 unsigned char Temp;
15 1 unsigned char i;
16 1 P2=0xff;
17 1 Temp=P1;
18 1 for(i=0;i<8;i++)
19 1 {
20 2 if((Temp&(1<<i))==0)
21 2 break;
22 2 }
23 1 if(i<8)
24 1 return i+1;
25 1 else
26 1 return 0;
27 1 }
28
29 /**********************************************
30 功能说明：读取按键动作
31 入口参数：无
32 出口参数：返回按键动作
33 注：没有按键动作，则返回0，1号按键动作，返回1-4
34 2号按键动作，返回5-8，如此类推
35 返回1、5、..：确认短按按下
36 返回2、6、..：确认长按按下
37 返回3、7、..：确认短按松开
38 返回4、8、..：确认长按松开
39 ***********************************************/
40 unsigned char OSReadKey(void)
41 {
42 1 static unsigned char KeyEventCnt=0;
43 1 static unsigned char KeySampleCnt=0;
44 1 static unsigned char KeyBuffer=0;
45 1 #define SHORT_ON_DITHERING_COUNTER 3//定义短按按下去抖时间
46 1 #define SHORT_OFF_DITHERING_COUNTER 3//定义短按松开去抖时间，一般与短按按下去抖时间相同
47 1
48 1 #if OS_LONG_KEY_EN>0
49 1 static unsigned int LongKeySampleCnt=0;
50 1 #define LONG_ON_DITHERING_COUNTER 250//定义长按按下确认需要的时间，如果是每1MS调用一次OSReadKey()，则1000
-意味着这个时间为1S
51 1 #define LONG_OFF_DITHERING_COUNTER 3//定义长按松开去抖时间，一般和短按去抖时间相同
52 1 #endif
53 1 unsigned char KeyTemp;
C51 COMPILER V8.02 KEY 03/12/2009 22:02:28 PAGE 2
54 1 KeyTemp=OSScanKey();
55 1 switch(KeyEventCnt)
56 1 {
57 2 case 0:
58 2 if(KeyTemp!=0)
59 2 {
60 3 KeySampleCnt=0;
61 3 KeyBuffer=KeyTemp;
62 3 KeyEventCnt=1;
63 3 }
64 2 return 0;//no key on,return 0
65 2 break;
66 2
67 2 #if OS_LONG_KEY_EN>0
68 2 case 1:
69 2 if(KeyTemp!=KeyBuffer)
70 2 {
71 3 KeyEventCnt=0;
72 3 return 0;//is dithering,return 0
73 3 }
74 2 else
75 2 {
76 3 if(++KeySampleCnt>SHORT_ON_DITHERING_COUNTER)
77 3 {
78 4 KeySampleCnt=0;
79 4 KeyEventCnt=2;
80 4 LongKeySampleCnt=0;
81 4 return ((KeyBuffer-1)<<2)+1;//sure that key on,return (KeyBuffer-1)<<2+1
82 4 }
83 3 else
84 3 return 0;//not sure that key on,return 0
85 3 }
86 2 break;
87 2
88 2 case 2:
89 2 if(++LongKeySampleCnt>LONG_ON_DITHERING_COUNTER)
90 2 {
91 3 KeySampleCnt=0;
92 3 KeyEventCnt=3;
93 3 return ((KeyBuffer-1)<<2)+2; //sure that key long on,return (KeyBuffer-1)<<2+2
94 3 }
95 2 else
96 2 {
97 3 if(KeyTemp!=KeyBuffer)
98 3 {
99 4 if(++KeySampleCnt>SHORT_OFF_DITHERING_COUNTER)
100 4 {
101 5 KeyEventCnt=0;
102 5 return ((KeyBuffer-1)<<2)+3;//after short on to off,(KeyBuffer-1)<<2+3
103 5 }
104 4 else
105 4 return 0;
106 4 }
107 3 else
108 3 {
109 4 KeySampleCnt=0;
110 4 return 0;
111 4 }
112 3 }
113 2 break;
114 2
115 2 case 3:
C51 COMPILER V8.02 KEY 03/12/2009 22:02:28 PAGE 3
116 2 if(KeyTemp!=KeyBuffer)
117 2 {
118 3 if(++KeySampleCnt>LONG_OFF_DITHERING_COUNTER)
119 3 {
120 4 KeyEventCnt=0;
121 4 return ((KeyBuffer-1)<<2)+4; //after long key on turn to off,(KeyBuffer-1)<<2+4
122 4 }
123 3 else
124 3 return 0;
125 3 }
126 2 else
127 2 {
128 3 KeySampleCnt=0;
129 3 return 0;
130 3 }
131 2 break;
132 2
133 2 #else
case 1:
if(KeyTemp!=KeyBuffer)
{
KeyEventCnt=0;
return 0;//is dithering,return 0
}
else
{
if(++KeySampleCnt>=SHORT_ON_DITHERING_COUNTER)
{
KeySampleCnt=0;
KeyEventCnt=2;
return ((KeyBuffer-1)<<2)+1;//sure that key on,return (KeyBuffer-1)<<2+1
}
else
return 0;//not sure that key on,return 0
}
break;
case 2:
if(KeyTemp!=KeyBuffer)
{
if(++KeySampleCnt>=SHORT_OFF_DITHERING_COUNTER)
{
KeyEventCnt=0;
return ((KeyBuffer-1)<<2)+3;//after short on to off,(KeyBuffer-1)<<2+3
}
else
return 0;
}
else
{
KeySampleCnt=0;
return 0;
}
break;
#endif
171 2
172 2 default:break;
173 2 }
174 1 return 0;
175 1 }
176 /***************************************************************/
C51 COMPILER V8.02 KEY 03/12/2009 22:02:28 PAGE 4
MODULE INFORMATION: STATIC OVERLAYABLE
CODE SIZE = 231 ----
CONSTANT SIZE = ---- ----
XDATA SIZE = ---- ----
PDATA SIZE = ---- ----
DATA SIZE = 5 ----
IDATA SIZE = ---- ----
BIT SIZE = ---- ----
END OF MODULE INFORMATION.
C51 COMPILATION COMPLETE. 0 WARNING(S), 0 ERROR(S)
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