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PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Jul 16, 2009 5:22 pm     Reply with quote
There is some interrupt-driven button code here:
http://www.ccsinfo.com/forum/viewtopic.php?t=31849
It doesn't have a button buffer, so you would only see the latest button
press, if you don't check the status for 10 seconds.

Here's an improved version that has a button buffer. See the code below.
The code for the "button.c" file is at this link:
http://www.ccsinfo.com/forum/viewtopic.php?t=23837

If I press one key and hold it down, and then release it and hold down
the other, and then hold both down at the same time, this will be the
output on the terminal window:
Quote:

Set
Set
Set
Set
Select
Select
Select
Select
Set
Select
Set
Select
Set
Select
Set


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 "button.c"

//----------------------------
// DEFINES


#define SELECT_BUTTON  1
#define SET_BUTTON     2

// Button pins
#define SELECT_BUTTON_PIN  PIN_B0
#define SET_BUTTON_PIN     PIN_A4

// The preload value below gives an RTCC interrupt rate of
// about 100 Hz (10 ms period) with a 4 MHz crystal.
#define RTCC_PRELOAD (256 - 39)


//----------------------------
// GLOBAL VARIABLES

// These are the "Bvar" variables required by Button.c.
// There is one variable for each button.
int8 Bvar_select = 0;   
int8 Bvar_set    = 0;   

// Variables used by button buffer code.
#define BUTTON_BUFFER_SIZE  16
int8 button_buffer[BUTTON_BUFFER_SIZE];
int8 next_in = 0;
int8 next_out = 0;

#define button_ready (next_in!=next_out)

//---------------------------------------------------
// The buttons are read in this Timer0 (RTCC) isr.
#int_rtcc
void rtcc_isr(void)
{
int t;

set_rtcc(RTCC_PRELOAD + get_rtcc()); 

// Check if the Select button was pressed. 
// If so, put it in the buffer.
if(button(SELECT_BUTTON_PIN, 0, 50, 10, Bvar_select, 1))   
  {
   button_buffer[next_in] = SELECT_BUTTON;
   t = next_in;
   next_in = (next_in+1) % BUTTON_BUFFER_SIZE;
   if(next_in == next_out)
      next_in = t;           // Buffer full !!
  }

// Check if the Set button was pressed. 
// If so, put it in the buffer.
if(button(SET_BUTTON_PIN, 0, 50, 10, Bvar_set, 1))   
  {
   button_buffer[next_in] = SET_BUTTON;
   t = next_in;
   next_in = (next_in+1) % BUTTON_BUFFER_SIZE;
   if(next_in == next_out)
      next_in = t;           // Buffer full !!
  }


}


int8 get_button(void)
{
int8 c;

while(!button_ready);

c = button_buffer[next_out];
next_out = (next_out+1) % BUTTON_BUFFER_SIZE;
return(c);
}


//================================
void main()
{
int8 button;

printf("Start \n\r");

setup_counters(RTCC_INTERNAL, RTCC_DIV_256);
set_rtcc(RTCC_PRELOAD);
clear_interrupt(INT_RTCC);
enable_interrupts(INT_RTCC);
enable_interrupts(GLOBAL);

while(1)
  {
   if(button_ready)
     {
      button = get_button();
     
      if(button == SELECT_BUTTON)
         printf("Select \n\r");
      if(button == SET_BUTTON)
         printf("Set \n\r");
     }
  }

}
mutthunaveen



Joined: 08 Apr 2009
Posts: 100
Location: Chennai, India

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PostPosted: Thu Jul 16, 2009 11:59 pm     Reply with quote
thank u very much.... but is too complicated to understand....

i will try to understand Rolling Eyes Very Happy Very Happy Very Happy
Haudi
Guest
PostPosted: Mon Nov 23, 2009 4:01 am     Reply with quote
Somehow I'm getting a get_button function value 25.
And I'm getting it only once because of if function (button_ready).


Code:


while(1)
  {
 
   if(button_ready)
     {
      button = get_button();
     button = a;
     printf("Button value %u \n\r",a); // a value is 25  ?
     printf("Select button  %u \r\n",SELECT_BUTTON); //1
     printf("Set button  %u \r\n",SET_BUTTON);//2
      if(button == SELECT_BUTTON)
         printf(lcd_putc,"Select \n\r");
      if(button == SET_BUTTON)
         printf("Set \n\r");
         
     }
  }

Also I've included a main function code.
Code:

#include "C:\Documents and Settings\Viktor\Application Data\PICC\Projects\LCD proov 3 1602\main lcd proov 3.h"

//#include <18F4520.H>
//#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
//#use delay(internal = 8000000)
#include <button.c>


#define SELECT_BUTTON  1
#define SET_BUTTON     2

// Button pins
#define SELECT_BUTTON_PIN  PIN_D0
#define SET_BUTTON_PIN     PIN_D1

// The preload value below gives an RTCC interrupt rate of
// about 100 Hz (10 ms period) with a 4 MHz crystal.
#define RTCC_PRELOAD (256 - 39)


//----------------------------
// GLOBAL VARIABLES

// These are the "Bvar" variables required by Button.c.
// There is one variable for each button.
int8 Bvar_select = 0;   
int8 Bvar_set    = 0;   

// Variables used by button buffer code.
#define BUTTON_BUFFER_SIZE  16
int8 button_buffer[BUTTON_BUFFER_SIZE];
int8 next_in = 0;
int8 next_out = 0;

#define button_ready (next_in!=next_out)


#define RTC_SDA  PIN_C4
#define RTC_SCL  PIN_C3
//int8 D0 = 0;   // For the button on pin A4
//int8 D1 = 0;   // For the button on pin B
#use I2C(MULTI_MASTER,sda=RTC_SDA, scl=RTC_SCL)
#use delay(internal=8M)
#use rs232(uart1, baud=9600)

//#use i2c(master,SDA=PIN_B7, SCL=PIN_B6)

#include <flex_lcd.c>
#include <stdlib.h>
#include <DS1307.c>
#include <muutmine.c>
#include <ADCfunktsioonid.c>

#include <nupud.c>

#int_rtcc
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