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单片机与PS2键盘接口程序
void int1proc() interrupt IE1_VECTOR using 1
{
unsigned ch* ar i, key;
code unsigned ch* ar PS2TAB[] = {//20键PS2小键盘键码表
0x70,//0
0x69,//1
0x72,//2
0x7a,//3
0x6b,//4
0x73,//5
0x74,//6
0x6c,//7
0x75,//8
0x7d,//9
0x05,//F1
0x06,//F2
0x04,//F3
0x0c,//F4
0x03,//F5
0x0b,//F6
0x5a,//Enter
0x76,//Esc
0x66,//Bksp
0x71//KP.
};
if (PS2Buffers.PS2Keyco u* nt == 0){//PS2起始位测试
if (!PS2CLOCK && !PS2DATA){//低电平是起始位
if (PS2Buffers.PS2KeyExtFlage != 0xf0){
PS2Buffers.PS2KeyTemp = 0;
PS2Buffers.PS2KeyExtFlage = 0;
PS2Buffers.PS2KeyPopError = 0;
}
PS2Buffers.PS2Keyco u* nt ++;//脉冲计数
}
else PS2Buffers.PS2KeyPopError = 0xeb;//置键起始位错误号0xeb
}
else if (PS2Buffers.PS2Keyco u* nt < 9){//PS2数据位
key = PS2Buffers.PS2KeyTemp;//取键盘缓冲区移位数据
key >>= 1;
if (PS2DATA) key |= 0x80;
PS2Buffers.PS2KeyTemp = key;
PS2Buffers.PS2Keyco u* nt++;//脉冲计数
}
else if (PS2Buffers.PS2Keyco u* nt == 9){//PS2数据奇校验
ACC = PS2Buffers.PS2KeyTemp;//取键盘缓冲区移位数据(C51取偶校验位)
if (P != PS2DATA) PS2Buffers.PS2Keyco u* nt ++;//脉冲计数
else{
PS2Buffers.PS2KeyPopError = 0xec;////置键奇校验位错误号0xec
PS2Buffers.PS2Keyco u* nt = 0;//脉冲计数归零
}
}
else if (PS2Buffers.PS2Keyco u* nt == 10){//停止位
key = PS2Buffers.PS2KeyTemp;//取键盘缓冲区移位数据
PS2Buffers.PS2Keyco u* nt = 0;//脉冲计数归零
if (PS2DATA){//高电平是停止位
if (key == 0xe0){//本次是扩展键
PS2Buffers.PS2KeyExtFlage = 0xe0;//置扩展键标志(小键盘只有回车键)
}
else if (key == 0xf0){//本次是键断码，键释放
PS2Buffers.PS2KeyExtFlage = 0xf0;//置键释放标志
}
else{//本次必为键值
if ((key == 0xaa) || (key == 0xfa)) PS2Buffers.PS2KeyPushco u* nt = 0;//长
压键计数器清零
else{
PS2CLOCK = 0;//阻止PS2键盘立即回送数据
PS2Buffers.PS2KeyPopError = 0xaa;//出错码
for (i = 0; i < 20; i++){
if (key == (PS2TAB)){//搜索
key = i + 1;
if (PS2Buffers.PS2KeyExtFlage == 0xf0){
key |= 0x80;//键释放
PS2Buffers.PS2KeyPushco u* nt = 0;//长压键计数器清零
PS2Buffers.PS2KeyMessage = key;//存入当前键值并执行命令
}
else{
if (key != PS2Buffers.PS2KeyVal){//换了一个键
PS2Buffers.PS2KeyPushco u* nt = 0;//长压键计数器清零
PS2Buffers.PS2KeyMessage = key;//存入当前键值并执行命令
}
else{//未换键
PS2Buffers.PS2KeyPushco u* nt ++;//长压键计数器计数
if (PS2Buffers.PS2KeyPushco u* nt > DEFPS2PUSHco u* nt){//长压时间到
PS2Buffers.PS2KeyMessage = key | 0x40;//存入当前键值并执行命
令
PS2Buffers.PS2KeyPushco u* nt = 0;//长压键计数器清零
}
}
}
PS2Buffers.PS2KeyVal = key;//存入当前键值值1~20或0x80+(1~20)
PS2Buffers.PS2KeyTemp = 0;//键码移位记录器
PS2Buffers.PS2KeyExtFlage = 0;//扩展键标志
PS2Buffers.PS2KeyPopError = 0;//键释放标志或出错码
break;
}
}
if (PS2Buffers.PS2KeyPopError) PS2Buffers.PS2KeyPushco u* nt = 0;//长压键
计数器清零
PS2CLOCK = 1;//释放PS2时钟总线
}
}
}
else PS2Buffers.PS2KeyPopError = 0xed;//置停止位错误号0xed
}
else PS2Buffers.PS2Keyco u* nt = 0;//PS2键盘出错
}
/*------------------------------------------------------------------
利用函数指针数组运行PS2键盘散转命令
-------------------------------------------------------------------*/
void PS2Commandex*e c(unsigned ch* ar key)
{
unsigned int i;
code void *funcpushbuffers[] = {//命令散转表(汇编中的16个DW)
/*------------------------------------------------------------------
15个压键、放键及长压键事件处理函数指针地址
-------------------------------------------------------------------*/
(void *)ClrWdt + 0x0000,
/*---------------------------------------------
10个功能键压键事件处理(独立管理)
----------------------------------------------*/
(void *)PS2F1KeyPush + 0x5b7d, //功能键F1压键事件处理
(void *)PS2F2KeyPush + 0xa6ea, //功能键F2压键事件处理
(void *)PS2F3KeyPush + 0xf157, //功能键F3压键事件处理
(void *)PS2F4KeyPush + 0x4cc4, //功能键F4压键事件处理
(void *)PS2F5KeyPush + 0x9731, //功能键F5压键事件处理
(void *)PS2F6KeyPush + 0xe2ae, //功能键F6压键事件处理
(void *)PS2EnterKeyPush + 0x3d1b, //功能键Enter压键事件处理
(void *)PS2EscKeyPush + 0x8888, //功能键Esc压键事件处理
(void *)PS2BkspKeyPush + 0xd3f5, //功能键Bksp压键事件处理
(void *)PS2KpKeyPush + 0x2e62, //功能键Kp压键事件处理
/*---------------------------------------------
2个放键事件处理(集中管理)
----------------------------------------------*/
(void *)PS2NumberKeyPop + 0x79df, //数字键放键事件处理
(void *)PS2FuncKeyPop + 0xc44c, //功能键放键事件处理
/*---------------------------------------------
2个长压键事件处理(集中管理)
----------------------------------------------*/
(void *)PS2NumberKeyPushL + 0x1fb9, //数字键长压键事件处理
(void *)PS2FuncKeyPushL + 0x6a26, //功能键长压键事件处理
/*---------------------------------------------
1个数字键压键事件处理(集中管理)
----------------------------------------------*/
(void *)PS2NumberKeyPush + 0xb593 //数字键0~9压键事件处理
};
/*--------------------------------------------*/
i = key;
key &= 0x3f;//去掉键释放及长压键标志,取真键码
key --;
if (key < 20){//只有20个键
if (key < 10){//数字键0~9
if (i <= 10) key = 15;//(散转号0)压数字键0~9
else{
if (i & 0x80) key = 11;//(散转号11)放数字键0~9
else key = 13;//(散转号13)长压数字键0~9
}
}
else{//压功能键F1~F6,Enter..KP
if ((i & 0xc0) == 0) key -= 9;//(散转号1~10)压功能键F1~F6,Enter..KP
else{
if (i & 0x80) key = 12;//(散转号12)放功能键
else key = 14;//(散转号14)长压功能键
}
}
ClrWdt();//喂狗(鬼知道键盘程序要运行多久,就替它先喂一次吧)
i = ((key * 53 & 0xf) * 0x1000)+ ((key * 43 & 0xf) * 0x100) + ((key * 23 &
0xf) * 0x10) + (key * 13 & 0xf);
_icall_((void *)funcpushbuffers[key] - i);//取键盘散转表并执行键盘命令
}
}
这个程序与一般网上的有很大区别,它充分利用了外部中断(0字)hotpower[1次]
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