gardiatech
Joined: 20 Sep 2011
Posts: 1
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| kbd.c and lcd.c at the same time on port B pic16F877 |
 Posted: Tue Sep 20, 2011 8:30 pm |
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hi
I'm new using ccs, it's great
but i have a problem and i need some expert help.
I'm trying to use port_b to drive lcd (4 bits data bus) and 4x3 keypad on rb interrupt, actually lcd it is working, but when a key is pressed, i use k=kbd_getc() inside rb_isr and i try to show on lcd and nothing happens.....
Searching i found a library to handle 4x4 keypad and i tried with this keypad library and works, it shows the key pressed on Proteus, but a logic collision happen......
circuit
This is the code using kbd.c
| Code: |
static char c;
unsigned char k; //Variable global tecla
//#include <keypad.c>
#include <kbd.c>
#define LCD_ENABLE_PIN PIN_A0
#define LCD_RS_PIN PIN_A1
#define LCD_RW_PIN PIN_A2
#define LCD_DATA4 PIN_B0
#define LCD_DATA5 PIN_B1
#define LCD_DATA6 PIN_B2 ////
#define LCD_DATA7 PIN_B3
#define LCD_DATA_PORT 0x06
#define LCD_TYPE 2
#define LCD_TRIS_LOCATION 0x86
#include <lcd.c>
#define use_portb_kbd TRUE
#byte PORTB=0x06
void main()
{
enable_interrupts(GLOBAL);
port_b_pullups(TRUE);
SET_TRIS_B( 0xF0 );
#asm movf 0x06,0 #endasm //evita interrupcion a la entrada.
clear_interrupt(int_RB);
enable_interrupts(INT_RB);
lcd_init();
kbd_init();
// TODO: USER CODE!!
lcd_putc("Ready...");
while(1)
{
}
}
//RUTINA DE INTERRUPCION DEL PUERTO B
#int_RB
void RB_isr()
{
disable_interrupts(INT_RB);
delay_ms (100);
#asm movf 0x06,0 #endasm //Sin esta instruccion no se pone a cero bandera de interrupcion
// Put your code here.
k=kbd_getc();
lcd_putc(k);
output_bit( PIN_C0, 1);//this it's just for see in proteus counter
output_bit( PIN_C0, 0);
clear_interrupt(int_RB);
enable_interrupts(INT_RB);
}
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This is the lib that works on proteus but showing logic collision
| Code: |
///////////////////////////////////////////////////////////////////////////
//// keypad.c ////
//// Driver para teclado 4x4 generico ////
//// ////
//// init_keypad() Debe llamarse desde el programa principal ////
//// antes de cualquier funcion ////
//// ////
//// scan_keypad() Función de escaneo de teclado segun ////
//// la matriz de teclado ////
//// ////
//// read_keypad() Encuentra la tecla por el metodo de inversion ////
//// de puerto, espera a que se deje de pulsar y ////
//// retorna. ////
//// ////
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
//// ////
//// RB4 RB5 RB6 RB7 ////
//// ^ ^ ^ ^ ////
//// | | | | ////
//// |---|---|---|---| El teclado se conecta sin ////
//// RB0 ---> | 1 | 2 | 3 | A | necesedad de resistencias ya ////
//// |---|---|---|---| que tiene las resistencias de ////
//// RB1 ---> | 4 | 5 | 6 | B | pull-up activadas ////
//// |---|---|---|---| ////
//// RB1 ---> | 7 | 8 | 9 | C | ////
//// |---|---|---|---| ////
//// RB3 ---> | * | 0 | # | D | ////
//// |---|---|---|---| ////
//// ////
///////////////////////////////////////////////////////////////////////////
//Direcciones de los registros segun PDF del pic 16fXXX
#byte PORTB=0x06 //Pic 16f877a
#byte TRISB=0x86 //
void init_keypad()
{
port_b_pullups (TRUE); //Habilita pull-up internos del puerto B
TRISB=0xF0;
PORTB=0;
enable_interrupts(INT_RB); // Habilita la interrupcion del puerto B ( RB4 - RB7).
enable_interrupts(GLOBAL); // Habilita las interrupciones globales.
}
unsigned char scan_keypad()
{
unsigned char i=0,j=0,PORT,PORTH,PORTL,PH,PL,key;
//Matriz de teclado
char keypad[4][4] = { {'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'E','0','F','D'} };
PORT=PORTB;
PORTH=PORT&0xF0;
PORTL=PORT&0x0F;
for(j=0;j<4;j++)
{
PH=~(0b00010000<<j)&0xF0;
if(PORTH == PH)
{
for(i=0;i<4;i++)
{
PL=~(0b00000001<<i)&0x0F;
if(PORTL == PL)
{
key=keypad[i][j];
while(PORT==PORTB);
}
}
}
}
if(key)
return(key); //Si la tecla es encontrada retorna valor segun la matriz de teclado
else
return('/'); //Si la tecla no es encontrada retorna un caracter nulo
}
unsigned char read_keypad()
{
char read,key;
read=PORTB;
// TRISB=0x0F;
PORTB=read;
// TRISB=0xF0;
key=scan_keypad();
return(key);
}
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Could somebody help me?
Thanks
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