📄 protocol.lst
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C51 COMPILER V7.02a PROTOCOL 04/23/2005 11:28:04 PAGE 1
C51 COMPILER V7.02a, COMPILATION OF MODULE PROTOCOL
OBJECT MODULE PLACED IN protocol.OBJ
COMPILER INVOKED BY: D:\Program Files\Keil\C51\BIN\C51.EXE protocol.c BROWSE DEBUG OBJECTEXTEND
stmt level source
1 //接收子函数
2 #include <head.c>
3 #include <math.h>
4 volatile unsigned char bdata s_buf,r_buf; //发送缓冲区、接收缓冲区
5 volatile unsigned char data last_s; //上次发送字节
6 extern bit scan_on; //扫描状态，main_t.c中定义
7 sbit s_buf0=s_buf^0;
8 sbit r_buf7=r_buf^7;
9 //新添加的变量
10 unsigned char data send_delay,delay_count;
11 volatile unsigned char bdata parity_buf;
12 sbit parity_buf0=parity_buf^0;
13 volatile unsigned char data first_delay,old_delay;//拍发速率、延迟时间
14 volatile unsigned char bdata scan_v,temp1,temp2;
15 sbit c0=scan_v^5;
16 sbit c1=scan_v^6;
17 sbit a0=scan_v^0;
18 sbit a1=scan_v^1;
19 sbit a2=scan_v^2;
20 sbit b0=scan_v^3;
21 sbit b1=scan_v^4;
22 sbit temp1_0=temp1^0;
23 sbit temp1_1=temp1^1;
24 sbit temp1_2=temp1^2;
25 sbit temp2_0=temp2^0;
26 sbit temp2_1=temp2^1;
27
28 void set_scan_v(unsigned char vv)//设置扫描速度（拍发速率、延迟时间）
29 //根据PS2协议，通过vv得到延缓时间first_delay和拍发速率old_delay的值
30 //系统缺省设置：拍发速率=10个/s±20%，延时=500ms±20%
31 //根据默认值是SCAN_V_DEFAULT 0x2c 00101100 first_delay=220,old_delay=44
32 //每计数220个对应延时500ms，每1/440 s计数一次，如果系统频率为11MHz,也就是计数器每计到25000，增加一次计数值
-send_delay
33 {
34 1 scan_v=vv;
35 1 temp1=0;
36 1 temp1_0=c0;
37 1 temp1_1=c1;
38 1 first_delay=(1+temp1)*60;
39 1 first_delay=first_delay/6*Frequence;
40 1 temp1=0;
41 1 temp2=0;
42 1 temp1_0=a0;
43 1 temp1_1=a1;
44 1 temp1_2=a2;
45 1 temp2_0=b0;
46 1 temp2_1=b1;
47 1 old_delay=(8+temp1)*(1<<temp2);
48 1 old_delay=old_delay/6*Frequence;
49 1 /* unsigned char i,j;
50 1 double cps;
51 1 float code repeat_rate[32]={2.0,2.1,2.3,2.5,2.7,3.0,3.3,3.7,4.0,4.3,4.6,5.0,5.5,6.0,6.7,7.5,
52 1 8.0,8.6,9.2,10.0,10.9,12.0,13.3,15.0,16.0,17.1,18.5,20.0,21.8,24.0,26.7,30.0};
53 1 i=(vv>>5)&0x03;
54 1 j=vv&0x1f;
C51 COMPILER V7.02a PROTOCOL 04/23/2005 11:28:04 PAGE 2
55 1 first_delay=(unsigned char)((4/(i+1))*(Frequence/(12*TIMER_COUNT)));
56 1 cps = 1 /((8 + (vv & 0x07)) * exp(log(2) * ((vv >> 3) & 0x03)) * 0.00417);
57 1 // old_delay=(unsigned char)(((repeat_rate[j]))*(Frequence/(12*TIMER_COUNT)));
58 1 */
59 1 }
60
61 void set_default()//设置缺省值
62 {
63 1 KBCLK=1;
64 1 KBDATA=1;
65 1 clr_buf();
66 1 set_scan_v(SCAN_V_DEFAULT);//SCAN_V_DEFAULT在head.c中定义
67 1 }
68
69 bit parity()//计算parity_buf中一个字节的奇偶校验值
70 {
71 1 bit PARITY=1;
72 1 unsigned char data c;
73 1 for(c=0;c<8;c++)
74 1 {
75 2 PARITY^=parity_buf0;
76 2 parity_buf=parity_buf>>1;
77 2 }
78 1 return PARITY;
79 1 }
80 void delay()//reentrant //延时24us
81 {
82 1 unsigned char data t=DELAY;
83 1 for(;--t;);
84 1 }
85
86 void sleep() //延时16us
87 {
88 1 unsigned char data t=SLEEP;
89 1 for(;--t;);
90 1 }
91
92 unsigned char receive(void) //接收子函数
93 //返回接收到的字节，接收错误则返回0
94 {
95 1 unsigned char data i;
96 1 bit PARITY;
97 1 ET1=0;
98 1 r_buf=0;
99 1 while(!KBCLK);//等待KBCLK变高
100 1 delay();
101 1 if(KBDATA) //KBDATA应该为低，表示接收到起始位，如果此时KBDATA为高，则退出并发送错误状态字0xfe
102 1 { send(0xfe);
103 2 return 0;}
104 1 delay();
105 1 sleep();
106 1 KBCLK=0; //KBCLK由键盘控制，产生时钟信号
107 1 for(i=0;i<8;i++)//将KBDATA上的数据在KBCLK的上升沿存入接收缓冲区r_buf7中
108 1 {
109 2 delay();
110 2 sleep();
111 2 KBCLK=1;
112 2 sleep();
113 2 if(!KBCLK) return 0; //如果KBCLK被拉低，表明主机取消发送
114 2 r_buf7=KBDATA;
115 2 if(i!=7)
116 2 r_buf=r_buf>>1;
C51 COMPILER V7.02a PROTOCOL 04/23/2005 11:28:04 PAGE 3
117 2 delay();
118 2 KBCLK=0;
119 2 }
120 1 delay();
121 1 sleep();
122 1 KBCLK=1;
123 1 sleep();
124 1 if(!KBCLK) return 0; //如果KBCLK被拉低，表明主机取消发送
125 1 PARITY=KBDATA; //接收奇偶校验位
126 1 delay();
127 1 KBCLK=0;
128 1 delay();
129 1 sleep();
130 1 KBCLK=1;
131 1 //停止位
132 1 delay();
133 1 if(!KBDATA) {send(0xfe);return 0;}//接收停止位，此时KBDATA应该为高，否则发送0xfe报错
134 1 KBDATA=0;//发送应答位，表明已经收到主机数据
135 1 sleep();
136 1 KBCLK=0;
137 1 sleep();
138 1 delay();
139 1 KBCLK=1;
140 1 sleep();
141 1 KBDATA=1;//将KBCLK和KBDATA置高
142 1 sleep();
143 1 ET1=1; //开中断
144 1 parity_buf=r_buf;
145 1 if(PARITY==parity())
146 1 return r_buf;
147 1 else {send(0xfe);return 0;}//判断奇偶校验位是否正确
148 1 //缺错误处理 *
149 1 //给主机时间抑制下次的通信
150 1 sleep();
151 1 delay();
152 1 }
153
154 bit send(unsigned char c) //发送子函数
155 //返回1表示发送成功，返回0表示发送失败
156 /*当时钟线和数据线均为高电平时，允许键盘发送数据，系统将接收数据；
157 当时钟线被拉为低电平时，表明系统禁止数据传输。发送时序包含1个低
158 电平触发的起始位、8位数据位、1个奇校验位和1个高电平的结束位*/
159 {
160 1 unsigned char data i;
161 1 bit PARITY;
162 1 KBCLK=1;
163 1 if(!KBCLK)//主机禁止键盘发送数据
164 1 return 0;
165 1 ET1=0; //关闭中断
166 1 parity_buf=c;
167 1 PARITY=parity();//计算c的奇偶校验值
168 1 last_s=c; //保存上一次发送字节
169 1 s_buf=c; //发送数据缓冲⌨️ 快捷键说明
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