Aprobecho este hilo referente a mi duda para así no tener que abrir otro. Aquí va: estoi practicando para aprender C y he planteando un programita que po medio de las interrupciones a las que se refiere el hilo, leer un teclado matricial 4x4 y mostrar la tecla pulsada en la pantalla del LCD. Pero en el display se ve la frase "Pulso -y un simbolo raro-", y no se donde puede estar el fallo.
Codigo:
//***********************************************
//* Practica con teclado 4x4 y LCD
//* Por Daniel G - by RaDoN (30/4/05)
//***********************************************
#include "16F877.h"
#fuses XT,NOWDT,NOPROTECT,PUT
#use delay (clock=4000000)
#use fast_io(D)
#include "4x20_LCD.h"
#include "4x4_KBD.h"
#define use_portb_kbd
#ORG 0x1F00,0x1FFF {} //for the 8k 16F876/7
int tecla;
#int_rb
void control_rb() {
tecla = kbd_getc();
printf(lcd_putc,"fPulso %c",tecla); }
void main() {
lcd_init(); // Inicializa el LCD
printf(lcd_putc,"f"
;
port_b_pullups(TRUE);
kbd_init(); // Inicializa el teclado matricial
enable_interrupts(int_rb); // Habilita interrupión cambio de estado RB4:7
enable_interrupts(global); // Habilita interrupciones globalmente
sleep(); }
Y uso la libreria de CCS para el teclado modificada para un 4x4 en vez de 4x3:
Codigo:
///////////////////////////////////////////////////////////////////////////
//// KBDD.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. ////
//// ////
///////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2003 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS C ////
//// compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, reproduction ////
//// or distribution is permitted without written permission. ////
//// Derivative programs created using this software in object code ////
//// form are not restricted in any way. ////
///////////////////////////////////////////////////////////////////////////
////////////////// The following defines the keypad layout on port D
// 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 ///////////////////////////////////// For the blue 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)
#else ////////////////////////////////////////////////// For the black keypad
#define COL0 (1 << 5)
#define COL1 (1 << 6)
#define COL2 (1 << 7)
#define COL3 (1 << 8)
#define ROW0 (1 << 1)
#define ROW1 (1 << 2)
#define ROW2 (1 << 3)
#define ROW3 (1 << 4)
#endif
#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() {
}
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=" ";
if(++kbd_call_count>KBD_DEBOUNCE_FACTOR) {
switch (col) {
case 0 : set_tris_kbd(ALL_PINS&~COL0);
kbd=~COL0&ALL_PINS;
break;
case 1 : set_tris_kbd(ALL_PINS&~COL1);
kbd=~COL1&ALL_PINS;
break;
case 2 : set_tris_kbd(ALL_PINS&~COL2);
kbd=~COL2&ALL_PINS;
break;
case 3 : set_tris_kbd(ALL_PINS&~COL3);
kbd=~COL3&ALL_PINS;
break;
}
if(kbd_down) {
if((kbd & (ALL_ROWS))==(ALL_ROWS)) {
kbd_down=FALSE;
kchar=last_key;
last_key=" ";
}
} else {
if((kbd & (ALL_ROWS))!=(ALL_ROWS)) {
if((kbd & ROW0)==0)
row=0;
else if((kbd & ROW1)==0)
row=1;
else if((kbd & ROW2)==0)
row=2;
else if((kbd & ROW3)==0)
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);
}