deltatech
Joined: 22 Apr 2006
Posts: 87
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| KeyPad Problem |
 Posted: Fri May 05, 2006 2:04 pm |
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Hi All I got this key pad example off the forumhttp://www.ccsinfo.com/forum/viewtopic.php?t=26333.
I have tried to make it work but its not working , I know the keys are working because when i press a key one of the segmonts on the lcd comes on .
I also dont understand what is the function of kbd_init(); it is empty but in the instructions it says to call it before every function ?
Thanks for your help
| Code: | include "G:\Program Files\PICC\Project\keypad2.h"
//This is a modification of CCS keypad driver (KBDD.c) with flexible pins connections.
//Code:
///////////////////////////////////////////////////////////////////////////
//// Flex_KBD.C ////
//// Generic keypad scan driver ////
//// ////
//// kbd_init() Must be called before any other function. ////
//// ////
//// c = kbd_getc(c) Will return a key value if pressed or /0 if not ////
//// This function should be called frequently so as ////
//// not to miss a key press. ////
//// ////
///////////////////////////////////////////////////////////////////////////
//Keypad connection:
#define col0 PIN_B0
#define col1 PIN_B1
#define col2 PIN_B2
#define row0 PIN_B3
#define row1 PIN_B4
#define row2 PIN_B5
#define row3 PIN_B6
char kbd_getc( );
void kbd_init();
// Keypad layout:
char const KEYS[4][3] = {{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'*','0','#'}};
#define KBD_DEBOUNCE_FACTOR 33 // Set this number to apx n/333 where
// n is the number of times you expect
// to call kbd_getc each second
void main()
{char key;
port_b_pullups(TRUE);
while(1)
{
kbd_init();
key=kbd_getc();
printf(key);
}
}
void kbd_init() {
}
short int ALL_ROWS (void)
{
if (input (row0) & input (row1) & input (row2) & input (row3))
return (0);
else
return (1);
}
char kbd_getc( ) {
static byte kbd_call_count;
static short int kbd_down;
static char last_key;
static byte col;
byte kchar;
byte row;
kchar='\0';
if(++kbd_call_count>KBD_DEBOUNCE_FACTOR) {
switch (col) {
case 0 : output_low(col0);
output_high(col1);
output_high(col2);
break;
case 1 : output_high(col0);
output_low(col1);
output_high(col2);
break;
case 2 : output_high(col0);
output_high(col1);
output_low(col2);
break;
}
if(kbd_down) {
if(!ALL_ROWS()) {
kbd_down=false;
kchar=last_key;
last_key='\0';
}
} else {
if(ALL_ROWS()) {
if(!input (row0))
row=0;
else if(!input (row1))
row=1;
else if(!input (row2))
row=2;
else if(!input (row3))
row=3;
last_key =KEYS[row][col];
kbd_down = true;
} else {
++col;
if(col==3)
col=0;
}
}
kbd_call_count=0;
}
return(kchar);
}
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