reading keypad input

[morebudwiser]

hi i am using the ccs keypad driver to scan a 4x4 keypad. what i want to be able to do is store the values entered on the keypad to a variable for example if key 1 ,2 , 3 is pressed each value is read in and then stored to a variable with the value of one hundred and twenty three. can anyone please advise me on the best way to do this.

[treitmey]

store the key scans in a array. put a \0 on the end to turn the array into a string. then run atoi atol.

look at help file. atoi and atol has "your" example exactly.

[JohnLeung]

May try the followings:

char FreeHandNum[3]={0x20,0x20,0x20}; //initialize to empty space
..
..

main (){

char kchar

...
kchar=kbd_getc( );
//remember to adjust the debounce factor well for a 30-50ms debounce time

if (kchar!=0){
switch(kchar){

case function key:
....//do setup etc
break;
case numeric key: FreeHandNum[0]=FreeHandNum[1]; FreeHandNum[1]=FreeHandNum[2]; FreeHandNum[2]=kchar;
break;
}

}
...
}

[KamPutty]

(Hi all)

You could also use a simple counter

EXAMPLE:
.
.
.
int counter=0;
.
.
n=number entered // 0, 1, 2 etc
.
counter=counter*10; //shift left one
counter=counter+n
.
. continue loop

For "1", "2", "3" we get

#1. Counter=0 (init)
#2. User entered "1" (I'm assuming numeric 1 and not character "1", else we simple do digitValue=characterValue-'0')
#3. Counter=Counter*10= 0 + 1
#4. Counter=1
#5. "2" Entered
#6. Counter=Counter*10=10+2
#7. Counter=12
#8. "3"
#9. Counter=Counter*10=120+3
#10. Counter=123

or just convert the string as mentioned above. many ways to do it!

~Kam (^8*
~Kam (^8*