defining a value to pushbutton

[Rohith_elec]

How can we define a value to a pushbutton ?

i made a code in mikroC, but some problems in int to ptr

 // LCD module connections
sbit LCD_RS at RD2_bit;  // for writing to output pin always use latch (PIC18 family)
sbit LCD_EN at RD3_bit;  // for writing to output pin always use latch (PIC18 family)
sbit LCD_D4 at RD4_bit;  // for writing to output pin always use latch (PIC18 family)
sbit LCD_D5 at RD5_bit;  // for writing to output pin always use latch (PIC18 family)
sbit LCD_D6 at RD6_bit;  // for writing to output pin always use latch (PIC18 family)
sbit LCD_D7 at RD7_bit;  // for writing to output pin always use latch (PIC18 family)

sbit LCD_RS_Direction at TRISD2_bit;
sbit LCD_EN_Direction at TRISD3_bit;
sbit LCD_D4_Direction at TRISD4_bit;
sbit LCD_D5_Direction at TRISD5_bit;
sbit LCD_D6_Direction at TRISD6_bit;
sbit LCD_D7_Direction at TRISD7_bit;
// End LCD module connections

#define A Button(&PORTB, 0, 1, 1)
#define B Button(&PORTB, 1, 1, 1)
#define C Button(&PORTB, 2, 1, 1)
#define D Button(&PORTB, 3, 1, 1)




void main() {
char A1,B1,C1,D1;

  ADCON1 |= 0x0F;                    // Configure AN pins as digital
  CMCON  |= 7;                       // Disable comparators
     IntToStr(A,  A1);
     IntToStr(B,  B1);
     IntToStr(C,  C1);
     IntToStr(D,  D1);
     
     
     
  Lcd_Init();                        // Initialize LCD
  Lcd_Cmd(_LCD_CLEAR);               // Clear display
  Lcd_Cmd(_LCD_CURSOR_OFF);          // Cursor off

  Lcd_Out(1,6,A1);                 // Write text in first row
  Lcd_Out(2,6,B1);                 // Write text in second row
  Delay_ms(2000);
  Lcd_Cmd(_LCD_CLEAR);               // Clear display

  Lcd_Out(1,1,C1);                 // Write text in first row
  Lcd_Out(2,5,D1);                 // Write text in second row
  Delay_ms(2000);

}

 

[alexan_e]

Fist of all I don't think it is a good idea to define single letters like A,B,C,D.

You define

#define A (Button(&PORTB, 0, 1, 1)

and then you use

 IntToStr(A,  A1);

which translates to

 IntToStr(Button(&PORTB, 0, 1, 1),  A1);

What is that supposed to do?
I don't see any declaration of a function named Button.

 

[Tahmid]

Button is a library function in mikroC.
Button library

What exactly do you mean by define a value to push-button?

The button is connected to one pin. So, that pin can read only 0 or 1. You can't make it read an 8-bit integer value. You can have a combination of buttons on PORTB and then read the value of PORTB.

Hope this helps.
Tahmid.

 

[Rohith_elec]

I want to make a series of button that holds a value,
like
for each key in keypad, there corresponds a value and we can apply that value in various applications

---------- Post added at 10:31 ---------- Previous post was at 10:18 ----------

The keypad lib in mikroC uses an entire port, i thought to decrease the usage of pins by saving values to buttons

or to give values to a variable when i press a button

 

[Tahmid]

If you're interested in using just 4 pins, you could use a keypad style configuration and do the PORT reading by yourself without the library. Basically, a keypad, but smaller than 4X4.

Hope this helps.
Tahmid.

 

[Rohith_elec]

can i use

 // LCD module connections
sbit LCD_RS at RD2_bit;  // for writing to output pin always use latch (PIC18 family)
sbit LCD_EN at RD3_bit;  // for writing to output pin always use latch (PIC18 family)
sbit LCD_D4 at RD4_bit;  // for writing to output pin always use latch (PIC18 family)
sbit LCD_D5 at RD5_bit;  // for writing to output pin always use latch (PIC18 family)
sbit LCD_D6 at RD6_bit;  // for writing to output pin always use latch (PIC18 family)
sbit LCD_D7 at RD7_bit;  // for writing to output pin always use latch (PIC18 family)

sbit LCD_RS_Direction at TRISD2_bit;
sbit LCD_EN_Direction at TRISD3_bit;
sbit LCD_D4_Direction at TRISD4_bit;
sbit LCD_D5_Direction at TRISD5_bit;
sbit LCD_D6_Direction at TRISD6_bit;
sbit LCD_D7_Direction at TRISD7_bit;
// End LCD module connections


void main() {
char A1,B1,C1,D1;

  ADCON1 |= 0x0F;                    // Configure AN pins as digital
  CMCON  |= 7;                       // Disable comparators
 
 if (Button(&PORTB, 0, 1, 1)) {  // Detect logical one
      A1 = "A";                 // Update flag
    }
 if (Button(&PORTB, 0, 1, 1)) {  // Detect logical one
      B1 = "B";                 // Update flag
    }
 if (Button(&PORTB, 0, 1, 1)) {  // Detect logical one
      C1 = "C";                 // Update flag
    }
 if (Button(&PORTB, 0, 1, 1)) {  // Detect logical one
      D1 = "D";                 // Update flag
    }
  
    /*IntToStr(A,  A1);
     IntToStr(B,  B1);
     IntToStr(C,  C1);
     IntToStr(D,  D1);*/
     
     
     
  Lcd_Init();                        // Initialize LCD
  Lcd_Cmd(_LCD_CLEAR);               // Clear display
  Lcd_Cmd(_LCD_CURSOR_OFF);          // Cursor off

  Lcd_Out(1,6,A1);                 // Write text in first row
  Lcd_Out(2,6,B1);                 // Write text in second row
  Delay_ms(2000);
  Lcd_Cmd(_LCD_CLEAR);               // Clear display

  Lcd_Out(1,1,C1);                 // Write text in first row
  Lcd_Out(2,5,D1);                 // Write text in second row
  Delay_ms(2000);

}