void int1proc() interrupt IE1_VECTOR using 1
{
unsigned char i, key;
code unsigned char PS2TAB[] = {//20鍵PS2小鍵盤鍵碼表
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.PS2KeyCount == 0){//PS2起始位測試
if (!PS2CLOCK && !PS2DATA){//低電平是起始位
if (PS2Buffers.PS2KeyExtFlage != 0xf0){
PS2Buffers.PS2KeyTemp = 0;
PS2Buffers.PS2KeyExtFlage = 0;
PS2Buffers.PS2KeyPopError = 0;
}
PS2Buffers.PS2KeyCount ++;//脈沖計數
}
else PS2Buffers.PS2KeyPopError = 0xeb;//置鍵起始位錯誤號0xeb
}
else if (PS2Buffers.PS2KeyCount < 9){//PS2數據位
key = PS2Buffers.PS2KeyTemp;//取鍵盤緩沖區移位數據
key >>= 1;
if (PS2DATA) key = 0x80;
PS2Buffers.PS2KeyTemp = key;
PS2Buffers.PS2KeyCount++;//脈沖計數
}
else if (PS2Buffers.PS2KeyCount == 9){//PS2數據奇校驗
ACC = PS2Buffers.PS2KeyTemp;//取鍵盤緩沖區移位數據(C51取偶校驗位)
if (P != PS2DATA) PS2Buffers.PS2KeyCount ++;//脈沖計數
else{
PS2Buffers.PS2KeyPopError = 0xec;////置鍵奇校驗位錯誤號0xec
PS2Buffers.PS2KeyCount = 0;//脈沖計數歸零
}
}
else if (PS2Buffers.PS2KeyCount == 10){//停止位
key = PS2Buffers.PS2KeyTemp;//取鍵盤緩沖區移位數據
PS2Buffers.PS2KeyCount = 0;//脈沖計數歸零
if (PS2DATA){//高電平是停止位
if (key == 0xe0){//本次是擴展鍵
PS2Buffers.PS2KeyExtFlage = 0xe0;//置擴展鍵標志(小鍵盤只有回車鍵)
}
else if (key == 0xf0){//本次是鍵斷碼,鍵釋放
PS2Buffers.PS2KeyExtFlage = 0xf0;//置鍵釋放標志
}
else{//本次必為鍵值
if ((key == 0xaa) (key == 0xfa)) PS2Buffers.PS2KeyPushCount = 0;//長
壓鍵計數器清零
else{
PS2CLOCK = 0;//阻止PS2鍵盤立即回送數據
PS2Buffers.PS2KeyPopError = 0xaa;//出錯碼
for (i = 0; i < 20; i++){
if (key == (PS2TAB[i])){//搜索
key = i + 1;
if (PS2Buffers.PS2KeyExtFlage == 0xf0){
key = 0x80;//鍵釋放
PS2Buffers.PS2KeyPushCount = 0;//長壓鍵計數器清零
PS2Buffers.PS2KeyMessage = key;//存入當前鍵值并執行命令
}
else{
if (key != PS2Buffers.PS2KeyVal){//換了一個鍵
PS2Buffers.PS2KeyPushCount = 0;//長壓鍵計數器清零
PS2Buffers.PS2KeyMessage = key;//存入當前鍵值并執行命令
}
else{//未換鍵
PS2Buffers.PS2KeyPushCount ++;//長壓鍵計數器計數
if (PS2Buffers.PS2KeyPushCount > DEFPS2PUSHCOUNT){//長壓時間到
PS2Buffers.PS2KeyMessage = key 0x40;//存入當前鍵值并執行命
令
PS2Buffers.PS2KeyPushCount = 0;//長壓鍵計數器清零
}
}
}
PS2Buffers.PS2KeyVal = key;//存入當前鍵值值1~20或0x80+(1~20)
PS2Buffers.PS2KeyTemp = 0;//鍵碼移位記錄器
PS2Buffers.PS2KeyExtFlage = 0;//擴展鍵標志
PS2Buffers.PS2KeyPopError = 0;//鍵釋放標志或出錯碼
break;
}
}
if (PS2Buffers.PS2KeyPopError) PS2Buffers.PS2KeyPushCount = 0;//長壓鍵
計數器清零
PS2CLOCK = 1;//釋放PS2時鐘總線
}
}
}
else PS2Buffers.PS2KeyPopError = 0xed;//置停止位錯誤號0xed
}
else PS2Buffers.PS2KeyCount = 0;//PS2鍵盤出錯
}
/*------------------------------------------------------------------
利用函數指針數組運行PS2鍵盤散轉命令
-------------------------------------------------------------------*/
void PS2CommandExec(unsigned char key)
{
unsigned int i;
code void *funcpushbuffers[] = {//命令散轉表(匯編中的16個DW)
/*------------------------------------------------------------------
鍵盤c程序15個壓鍵、放鍵及長壓鍵事件處理函數指針地址
-------------------------------------------------------------------*/
(void *)ClrWdt + 0x0000,
/*---------------------------------------------
10個功能鍵壓鍵事件處理(獨立管理)
----------------------------------------------*/
(void *)PS2F1KeyPush + 0x5b7d, //功能鍵F1壓鍵事件處理
(void *)PS2F2KeyPush + 0xa6ea, //功能鍵F2壓鍵事件處理
(void *)PS2F3KeyPush + 0xf157, //功能鍵F3壓鍵事件處理
(void *)PS2F4KeyPush + 0x4cc4, //功能鍵F4壓鍵事件處理
(void *)PS2F5KeyPush + 0x9731, //功能鍵F5壓鍵事件處理
(void *)PS2F6KeyPush + 0xe2ae, //功能鍵F6壓鍵事件處理
(void *)PS2EnterKeyPush + 0x3d1b, //功能鍵Enter壓鍵事件處理
(void *)PS2EscKeyPush + 0x8888, //功能鍵Esc壓鍵事件處理
(void *)PS2BkspKeyPush + 0xd3f5, //功能鍵Bksp壓鍵事件處理
(void *)PS2KpKeyPush + 0x2e62, //功能鍵Kp壓鍵事件處理
/*---------------------------------------------
2個放鍵事件處理(集中管理)
----------------------------------------------*/
(void *)PS2NumberKeyPop + 0x79df, //數字鍵放鍵事件處理
(void *)PS2FuncKeyPop + 0xc44c, //功能鍵放鍵事件處理
/*---------------------------------------------
2個長壓鍵事件處理(集中管理)
----------------------------------------------*/
(void *)PS2NumberKeyPushL + 0x1fb9, //數字鍵長壓鍵事件處理
(void *)PS2FuncKeyPushL + 0x6a26, //功能鍵長壓鍵事件處理
/*---------------------------------------------
1個數字鍵壓鍵事件處理(集中管理)
----------------------------------------------*/
(void *)PS2NumberKeyPush + 0xb593 //數字鍵0~9壓鍵事件處理
};
/*--------------------------------------------*/
i = key;
key &= 0x3f;//去掉鍵釋放及長壓鍵標志,取真鍵碼
key --;
if (key < 20){//只有20個鍵
if (key < 10){//數字鍵0~9
if (i <= 10) key = 15;//(散轉號0)壓數字鍵0~9
else{
if (i & 0x80) key = 11;//(散轉號11)放數字鍵0~9
else key = 13;//(散轉號13)長壓數字鍵0~9
}
}
else{//壓功能鍵F1~F6,Enter..KP
if ((i & 0xc0) == 0) key -= 9;//(散轉號1~10)壓功能鍵F1~F6,Enter..KP
else{
if (i & 0x80) key = 12;//(散轉號12)放功能鍵
else key = 14;//(散轉號14)長壓功能鍵
}
}
ClrWdt();//喂狗(鬼知道鍵盤程序要運行多久,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);//取鍵盤散轉表并執行鍵盤命令
}
}
這個鍵盤程序與一般網上的有很大區別,它充分利用了外部中斷(0字)hotpower[1次]
****下面是一個不版本的單片機鍵盤c程序歡迎廣大讀者實驗http://www.izizhuan.cn 編制********************************
unsigned CHAR key,key_h,kpush;
unsigned int key_l;
//按鍵連接到p1.0、p1.1、p1.2
void int_t0(void) interrupt 1 {
unsigned CHAR dd,i;
TL0=TL0+30;TH0=0xfb; //800
/* 按鍵判別 */
if ((P1&0x7)==0x7) {
if ((key_l>30)&&(key_l<800)&&(key_h>30)) { //釋放按鍵，如果之前按鍵時間少于1秒，讀入鍵值
key=kpush;
}
if ((++key_h)>200) key_h=200;
key_l=0;
if (key>=0x80) key=0; //如果之前的按鍵為長按1秒，清除鍵值
} else {
kpush=P1&0x7;
key_l++;
if ((key_l>800)&&(key_h>30)) { //如果按鍵超過1秒，鍵值加0x80標志長按鍵
key=kpush|0x80;
key_h=0;
key_l=0;
}
}
}
void main(void) {
TMOD=0x1;TR0=1;ET0=1;EA=1;
while (1) {
while (!key) {}
SWITCH (key) {
case 1:break;
case 2:break;
}
}
}