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Message |
andymarrole
Joined: 28 Sep 2010
Posts: 4
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| interfacing keypad with 18f4550 |
 Posted: Sun Oct 03, 2010 7:00 am |
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I have a problem with my coding in ccs.
When I compile it show lot of error.
I just edit my program from kbd.c.
Please help me.
Tis is my source code.
| Code: |
#include <18F4550.h>
#fuses HSPLL, PLL5, CPUDIV1, NOWDT, PUT, BROWNOUT, NOLVP
#use delay (clock=20000000)
#include <kbd.c>
#include <lcd.c>
#define use_portb_kbd TRUE
#define use_portd_lcd TRUE
//Keypad connection:
#define row0 PIN_B4
#define row1 PIN_B5
#define row2 PIN_B6
#define row3 PIN_B7
#define col0 PIN_B0
#define col1 PIN_B1
#define col2 PIN_B2
#define col3 PIN_B3
#define ALL_ROWS (row0|row1|row2|row3)
#define ALL_PINS (ALL_ROWS|col0|col1|col2|col3)
// Keypad layout:
char const KEYS[4][4] = {{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}};
#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;
}
set_tris_kbd(ALL_PINS);
return(kchar);
}
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Oct 03, 2010 1:53 pm |
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You don't have a main() function. You need to learn how to put together
a C program, before you try to use a C compiler. Read a book or an
online tutorial on C programming.
For the kbc.c and lcd.c driver files, there is a test program available.
It's in this directory, for the CCS compiler:
c:\program files\picc\examples\ex_lcdkb.c
Notice how the program does not contain the code for the lcd or kbd.
The program just includes those files with an #include statement.
My suggestion is, start again, and first make a program to blink an LED.
Get that working. Then consider doing more. |
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andymarrole
Joined: 28 Sep 2010
Posts: 4
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| Posted: Sun Oct 03, 2010 9:32 pm |
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i already have the main program...
the program is to detect which key of 4x4 keypad pressed then display on lcd.. this is my main program...
| Code: |
void main() {
char k;
lcd_init();
kbd_init();
lcd_putc("\fReady...\n");
while (TRUE) {
k=kbd_getc();
if(k!=0)
if(k=='*')
lcd_putc('\f');
else
lcd_putc(k);
}
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Oct 03, 2010 10:06 pm |
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That's not the full program.
It's missing these lines at the top:
1. The #include line for 18F4550.h
2. The #fuses line.
3. The #use delay() line.
4. The #include line for kbd.c
5. The #include line for lcd.c
Read the first part of this thread. It explains some common mistakes:
http://www.ccsinfo.com/forum/viewtopic.php?t=42061 |
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andymarrole
Joined: 28 Sep 2010
Posts: 4
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| Posted: Mon Oct 04, 2010 5:15 am |
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i already define all those declaration as you state in my keypad program...
| Quote: | They are driver files. They are not stand-alone programs. They are
required to be included in a larger program. This is done with #include
statements. |
do i need to use driver lcd.c and kbd.c in other to complete the program in lcdkb.c?? thank you |
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