hvthien
Joined: 14 Dec 2011
Posts: 1
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| More function for Keypad 4x4 with 18F452 |
 Posted: Wed Dec 14, 2011 2:46 am |
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Dear All!
This is first time I work with PIC.
I want you help me about Keypad 4x4.
I use CCS to Coding for 18F452.
My project use library: #include (Thien_kbd.c) as below:
| Code: |
// config in File main.h as below
/*//Keypad connection:
#define row0 PIN_D0
#define row1 PIN_D1
#define row2 PIN_D2
#define row3 PIN_D3
#define col0 PIN_D4
#define col1 PIN_D5
#define col2 PIN_D6
#define col3 PIN_D7*/
// Keypad layout:
char const KEYS[4][4] =
{{'0','1','2','3'},
{'4','5','6','7'},
{'8','9','A','B'},
{'C','D','E','F'}};
#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 kbd_init()
{
//set_tris_b(0xF0);
//output_b(0xF0);
port_b_pullups(true);
}
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);
output_high(col3);
break;
case 1:
output_high(col0);
output_low(col1);
output_high(col2);
output_high(col3);
break;
case 2:
output_high(col0);
output_high(col1);
output_low(col2);
output_high(col3);
break;
case 3:
output_high(col0);
output_high(col1);
output_high(col2);
output_low(col3);
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==4)
col=0;
}
}
kbd_call_count=0;
}
return(kchar);
}
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Run was OK.
But now I want have more function:
1. Press and Hold key
Example: if hold the key number 1 for more 2 sec then: kchar have a value to doing to use in main.c
2. Press 2 keys
Example: if press key number 1 & 2 then: kchar have a other value
Thanks a lot.
Hoang Van Thien
VietnamAirlines. |
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