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micro2
Guest
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| kbd.c on portb and porta |
 Posted: Fri Jul 01, 2005 11:12 am |
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Hi,
How i can modify kbd.c to work with portB and portA?
(portB2 = COL1, portB3 = COL2, portB4 = COL3)
(portA0 = ROW1, portA1 = ROW2, portA2 = ROW3, portA3 = ROW4)
Thanks |
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jahan
Joined: 04 Apr 2005
Posts: 63
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| Posted: Fri Jul 01, 2005 3:16 pm |
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as far as I can tell you should only change the following lines of code on the top part of kbd.c
| Code: |
// Un-comment the following define to use port B
// #define use_portb_kbd TRUE
// Make sure the port used has pull-up resistors (or the LCD) on
// the column pins
#if defined(__PCH__)
#if defined use_portb_kbd
#byte kbd = 0xF81 // This puts the entire structure
#else
#byte kbd = 0xF83 // This puts the entire structure
#endif
#else
#if defined use_portb_kbd
#byte kbd = 6 // on to port B (at address 6)
#else
#byte kbd = 8 // on to port D (at address 8)
#endif
#endif
#if defined use_portb_kbd
#define set_tris_kbd(x) set_tris_b(x)
#else
#define set_tris_kbd(x) set_tris_d(x)
#endif
//Keypad connection: (for example column 0 is B2)
// Bx:
#ifdef blue_keypad /////// modify for your keypad
#define COL0 (1 << 2)
#define COL1 (1 << 3)
#define COL2 (1 << 6)
#define ROW0 (1 << 4)
#define ROW1 (1 << 7)
#define ROW2 (1 << 1)
#define ROW3 (1 << 5)
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sun Jul 03, 2005 10:34 pm |
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| Quote: | How i can modify kbd.c to work with portB and portA?
(portB2 = COL1, portB3 = COL2, portB4 = COL3)
(portA0 = ROW1, portA1 = ROW2, portA2 = ROW3, portA3 = ROW4) |
Here is a modified version of the CCS keypad driver that
will work with the column and row pins on different ports.
The driver shown below will work with the pins specified
in your post.
This is a test program that #includes the new driver.
It displays its output on a terminal window.
| Code: | #include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
#include <kbd1.c>
//========================
void main()
{
int8 k;
printf("Start\n\r");
while(1)
{
k = kbd_getc();
if(k != 0)
{
if(k == '*')
{
putc('\n');
putc('\r');
}
else
{
putc(k);
}
}
}
} |
This is the driver that puts the ROW pins on Port A and the
column pins on Port B. Pull-up resistors are required on
the four row pins on Port A. (Use 10K ohm resistors).
| Code: |
// KBD1.C
#if defined(__PCH__)
#if defined use_portb_kbd
#byte kbd_rows = 0xF80 // Port A on 18F452
#byte kbd_cols = 0xF81 // Port B on 18F452
#endif
#else
#byte kbd_rows = 5 // Port A on 16F877
#byte kbd_cols = 6 // Port B on 16F877
#endif
#define set_tris_kbd_rows(x) set_tris_a(x)
#define set_tris_kbd_cols(x) set_tris_b(x)
#define Bitmask(x) (1 << (x & 7))
// These statements define the connections between the keypad
// pins and the PIC pins. For example, the column 0 pin on the
// keypad connector goes to pin B2 on the PIC. If you change
// the wiring on your board, then you must also change the
// definitions below to match your board. I have used the
// Bitmask() macro in the following statements because I think
// it makes the connections easier to understand, compared to
// the way CCS does it in their driver.
#define COL0 Bitmask(PIN_B2)
#define COL1 Bitmask(PIN_B3)
#define COL2 Bitmask(PIN_B4)
#define ROW0 Bitmask(PIN_A0)
#define ROW1 Bitmask(PIN_A1)
#define ROW2 Bitmask(PIN_A2)
#define ROW3 Bitmask(PIN_A3)
#define ALL_ROWS (ROW0|ROW1|ROW2|ROW3)
#define ALL_COLS (COL0|COL1|COL2)
// Keypad layout:
char const KEYS[4][3] = {{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'*','0','#'}};
// Set this number to apx n/333 where
// n is the number of times you expect
// to call kbd_getc each second.
#define KBD_DEBOUNCE_FACTOR 33
void kbd_init()
{
}
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 : set_tris_kbd_cols(ALL_COLS&~COL0);
kbd_cols=~COL0&ALL_COLS;
break;
case 1 : set_tris_kbd_cols(ALL_COLS&~COL1);
kbd_cols=~COL1&ALL_COLS;
break;
case 2 : set_tris_kbd_cols(ALL_COLS&~COL2);
kbd_cols=~COL2&ALL_COLS;
break;
}
if(kbd_down) {
if((kbd_rows & (ALL_ROWS))==(ALL_ROWS)) {
kbd_down=FALSE;
kchar=last_key;
last_key='\0';
}
} else {
if((kbd_rows & (ALL_ROWS))!=(ALL_ROWS)) {
if((kbd_rows & ROW0)==0)
row=0;
else if((kbd_rows & ROW1)==0)
row=1;
else if((kbd_rows & ROW2)==0)
row=2;
else if((kbd_rows & ROW3)==0)
row=3;
last_key =KEYS[row][col];
kbd_down = TRUE;
} else {
++col;
if(col==3)
col=0;
}
}
kbd_call_count=0;
}
set_tris_kbd_rows(ALL_ROWS);
set_tris_kbd_cols(ALL_COLS);
return(kchar);
} |
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Guest
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| Posted: Mon Jul 04, 2005 12:56 pm |
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Ok  ,
thanks PCM programmer |
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Vitoco.lr
Joined: 08 Jul 2017
Posts: 5
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| Posted: Tue Jul 11, 2017 9:53 pm |
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Hey, I tried to use this code on my PIC16f877a with a matrix keypad 4x4, i made these modifications to the code but it is working really weird... I need some help on int, I'm using RB0 for interrupts so that's why I have the mask like it is.. Please
This are the pins I can use
| Code: |
#define COL0 Bitmask(PIN_B1)
#define COL1 Bitmask(PIN_B2)
#define COL2 Bitmask(PIN_B3)
#define COL3 Bitmask(PIN_B4)
#define ROW0 Bitmask(PIN_A2)
#define ROW1 Bitmask(PIN_A3)
#define ROW2 Bitmask(PIN_A4)
#define ROW3 Bitmask(PIN_A5)
|
I did this because is 4x4
| Code: |
#define ALL_ROWS (ROW0|ROW1|ROW2|ROW3)
#define ALL_COLS (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'}}; |
| Code: |
if(++kbd_call_count>KBD_DEBOUNCE_FACTOR) {
switch (col) {
case 0 : set_tris_kbd_cols(ALL_COLS&~COL0);
kbd_cols=~COL0&ALL_COLS;
break;
case 1 : set_tris_kbd_cols(ALL_COLS&~COL1);
kbd_cols=~COL1&ALL_COLS;
break;
case 2 : set_tris_kbd_cols(ALL_COLS&~COL2);
kbd_cols=~COL2&ALL_COLS;
break;
case 3 : set_tris_kbd_cols(ALL_COLS&~COL3);
kbd_cols=~COL3&ALL_COLS;
break;
}
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And at last
| Code: |
else {
++col;
if(col==4)
col=0;
}
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But really I can't find where the mistake is... Please help... |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Jul 11, 2017 10:29 pm |
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Do you have pull-ups on the row pins ? You need them. Each keypad row
pin should have this circuit on it:
| Code: |
+5v
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<
> 10K
<
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PIC pin -------o-------- Keypad pin
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Vitoco.lr
Joined: 08 Jul 2017
Posts: 5
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| Posted: Tue Jul 11, 2017 11:59 pm |
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| Yes I have them! I ended up making it work... but now for somehow the interruption isn't working... is there any way of making the pins working for the matrix keypad more than the "entire" port B?, maybe there is a problem with that but to be honest I wouldn't know how to solve it. At this point that's the last thing I need to solve... |
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temtronic
Joined: 01 Jul 2010
Posts: 9108
Location: Greensville,Ontario
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| Posted: Wed Jul 12, 2017 4:59 am |
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You may want to look here...
http://www.ccsinfo.com/forum/viewtopic.php?t=26333&highlight=flexkbd
This is a 'flexible' version of the keyboad driver. I use it, it works, just be sure that the I/O pins you select can be used for inputs if used for rows and outputs if used for columns. Not all PIC pins can be used for ins and outs...
Jay |
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