呵呵,这样都记得.的确是哦
7楼： 随便说说
if (R1 == 0) Key = '2';
if (R2 == 0) Key = '5';
if (R3 == 0) Key = '8';
if (R4 == 0) Key = '0';
如果R1=0则Key = '2'...
但如果R1,R2,R3,R4其中几个都为0怎样,合理吗....
所以 一看就写的不咋地,没有必要继续看...
bit KEYPAD_Scan(char* const pKey, char* const pFuncKey)
{
static data char Old_Key;
char Key = KEYPAD_NO_NEW_DATA;
char Fn_key = (char) 0x00;
char i; //添加的
C1 = 0; // Scanning column 1
if (R1 == 0) {Key = '1';i++;}
if (R2 == 0) {Key = '4';i++;}
if (R3 == 0) {Key = '7';i++;}
if (R4 == 0) Fn_key = '*';
C1 = 1;
C2 = 0; // Scanning column 2
if (R1 == 0) {Key = '2';i++;}
if (R2 == 0) {Key = '5';i++;}
if (R3 == 0) {Key = '8';i++;}
if (R4 == 0) {Key = '0';i++;}
C2 = 1;
C3 = 0; // Scanning column 3
if (R1 == 0) {Key = '3';i++;}
if (R2 == 0) {Key = '6';i++;}
if (R3 == 0) {Key = '9';i++;}
if (R4 == 0) Fn_key = '#';
C3 = 1;
if (Key == KEYPAD_NO_NEW_DATA)
{
// No key pressed (or just a function key)
Old_Key = KEYPAD_NO_NEW_DATA;
Last_valid_key_G = KEYPAD_NO_NEW_DATA;
return 0; // No new data
}
// A key has been pressed: debounce by checking twice
if(i==1) //添加的
{
if (Key == Old_Key)
{
// A valid (debounced) key press has been detected
// Must be a new key to be valid - no 'auto repeat'
if (Key != Last_valid_key_G)
{
// New key!
*pKey = Key;
Last_valid_key_G = Key;
// Is the function key pressed too?
if (Fn_key)
{
// Function key *is* pressed with another key
*pFuncKey = Fn_key;
}
else
{
*pFuncKey = (char) 0x00;
}
return 1;
}
}
}//end if(i==1)
// No new data
Old_Key = Key;
return0; return 0;
}
这样就可以禁止两个以上的数字键被按下了,,,,不同的要求偏写不同的程序就可以了,没必要什么都做的十全十美的,在特定的场合OK就行了!!!
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