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hayee
Joined: 05 Sep 2007
Posts: 252
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| keypad routine |
 Posted: Sat Oct 31, 2009 12:21 am |
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Hi,
I have made a routine which scan for keypad and display data on lcd.
The range of numbers entered from keypad is between 0-999. My code is as follows. The code seems to be working fine. Can I make it more effective or reduce the code by using other techniques?
I also want to enter floating numbers and display it on the lcd e.g 14.5, 587.32, 1.2 etc.
What will be the technique for that?
| Code: |
VOID main()
{
int16 array[3]={0,0,0};
int16 value;
int16 unit,ten,hundred,add;
int i=0;
lcd_init();
setup_adc_ports (NO_ANALOGS);
setup_adc (ADC_OFF);
setup_psp (PSP_DISABLED);
setup_spi (FALSE);
setup_timer_0 (RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1 (T1_INTERNAL|T1_DIV_BY_1);
setup_timer_2 (T2_DISABLED, 0, 1);
while (1)
{
value = readkeypad ();//get value from readkeypad function.
delay_ms(100);//for debouncing
if(value != 255)//if value is other than 255
{
if(value==10)//for indication that data is completed.
{
if(i==1)//means that entered value is consist of only 1 number e.g 3
{
unit=array[0];
array[1]=0;
array[2]=0;
add=unit;//arrange data and display it
printf(lcd_putc,"\f\nsum is %lu",add);
i=0;
}
if(i==2)//means that entered value is consist of 2 numbers e.g 25
{
unit=array[0]*10;
ten=array[1];
array[2]=0;
add=unit + ten;//arrange data and display it
printf(lcd_putc,"\f\nsum is %lu",add);
i=0;
}
if(i==3)//means that entered value is consist of 2 numbers e.g 285
{
unit=array[0]*100;
ten=array[1]*10;
hundred=array[2];
add=unit + ten + hundred;//arrange data and display it
printf(lcd_putc,"\f\nsum is %lu",add);
i=0;
}
}
else
{
array[i]=value;//get values and put it in array.
lcd_gotoxy(i+1,1);//increament lcd cursor position according to i.
printf(lcd_putc,"%lu",value);
i++;
if(i>3)//i require only three digit number.
{
i=0;
}
}
}
}
}
int readkeypad (void)
{
output_bit (r1, 0);
output_bit (r2, 0);
output_bit (r3, 0);
output_bit (r4, 0);
output_bit (r1, 1);
delay_ms(10);
IF (input (c1)) RETURN 10;
IF (input (c2)) RETURN 0;
IF (input (c3)) RETURN 11;
IF (input (c4)) RETURN 12;
output_bit (r1, 0);
output_bit (r2, 1);
delay_ms(10);
IF (input (c1)) RETURN 7;
IF (input (c2)) RETURN 8;
IF (input (c3)) RETURN 9;
IF (input (c4)) RETURN 13;
output_bit (r2, 0);
output_bit (r3, 1);
delay_ms(10);
IF (input (c1)) RETURN 4;
IF (input (c2)) RETURN 5;
IF (input (c3)) RETURN 6;
IF (input (c4)) RETURN 14;
output_bit (r3, 0);
output_bit (r4, 1);
delay_ms(10);
IF (input (c1)) RETURN 1;
IF (input (c2)) RETURN 2;
IF (input (c3)) RETURN 3;
IF (input (c4)) RETURN 15;
output_bit (r4, 0);
RETURN 255;
}
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hayee
Joined: 05 Sep 2007
Posts: 252
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| Posted: Mon Nov 02, 2009 10:20 pm |
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| any suggestions for floating numbers . |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Nov 03, 2009 2:44 pm |
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Does your keypad have a decimal point key on it ?
If not, post the keys that it does have. |
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hayee
Joined: 05 Sep 2007
Posts: 252
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| Posted: Tue Nov 03, 2009 11:06 pm |
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I have done a little bit for floating numbers.
My code is consuming lot of memory.
I want to restrict some things.
Before decimal point I want 0-3 digits. No more than 3 digits and 0-2 digits after decimal point.
When user press like this .01, .1, 1.25, 10.4, 999.9 it has to display data as they are entered.
I have tried all this in my below code, but I am confused how to do these.
I have added comments so that you guys understand it.
I have 16 keys in keypad. I have assigned values for (F1=10 for completion of data) and (F2=11 for decimal). I am not using P1,P2,P3,P4 right now.
| Code: |
///////////////////////////////////////////////////////////////////////////////
////// keypad keys ////////////////
////// 1 2 3 P1 ////////////////
////// 4 5 6 P2 ////////////////
////// 7 8 9 P3 ////////////////
////// F1 0 F2 P4 ////////////////
////// ////////////////
///////////////////////////////////////////////////////////////////////////////
#include "k1.h"
#include <E:\abdul hayee\pic controller\my examples\current interrupter\Flexlcd.c>
#include <string.h>
#include <stdlib.h>
#define r1 PIN_B2//row
#define r2 PIN_B3//row
#define r3 PIN_B4//row
#define r4 PIN_B5//row
#define c1 PIN_A2//column
#define c2 PIN_A3//column
#define c3 PIN_A4//column
#define c4 PIN_A5//column
int readkeypad(void);
VOID main()
{
int16 array[6]={0,0,0,0,0,0};
int16 value;
float unit,ten,hundred,onetenth,onehundred,add;
int i=0,j=5,k=1;
lcd_init();
setup_adc_ports (NO_ANALOGS);
setup_adc (ADC_OFF);
setup_psp (PSP_DISABLED);
setup_spi (FALSE);
setup_timer_0 (RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1 (T1_INTERNAL|T1_DIV_BY_1);
setup_timer_2 (T2_DISABLED, 0, 1);
while (1)
{
value = readkeypad ();//get value from readkeypad function.
delay_ms(200);//for debouncing
if(value != 255)//if value is other than 255
{
if(value==10)//for indication that data is completed.
{
switch(j)
{
case 4://means data is like that .01
onehundred=array[5]*.01;
add=onehundred;
printf(lcd_putc,"\f\nsum is %3.2f",add);
i=0;j=5;k=1;
break;
case 3://means data is like that .10
onetenth=array[4]*.1;
onehundred=array[5]*.01;
add= onetenth + onehundred;
printf(lcd_putc,"\f\nsum is %3.2f",add);
i=0;j=5;k=1;
break;
case 2://means data is like that 1.23
unit=array[0];
onetenth=array[4]*.1;
onehundred=array[5]*.01;
add=unit + onetenth + onehundred;
printf(lcd_putc,"\f\nsum is %3.2f",add);
i=0;j=5;k=1;
break;
case 1://means data is like that 10.23
unit=array[0]*10;
ten=array[1];
onetenth=array[4]*.1;
onehundred=array[5]*.01;
add=unit + ten + onetenth + onehundred;
printf(lcd_putc,"\f\nsum is %3.2f",add);
i=0;j=5;k=1;
break;
case 0://means data is like that 123.45
unit=array[0]*100;
ten=array[1]*10;
hundred=array[2];
onetenth=array[4]*.1;
onehundred=array[5]*.01;
add=unit + ten + hundred + onetenth + onehundred;//arrange data and display it
printf(lcd_putc,"\f\nsum is %3.2f",add);
i=0;j=5;k=1;
break;
}
}
else if(value==11)
{
if(k==1)//this restrict to only one decimal
{
printf(lcd_putc,".");
}
k++;
i=4;
}
else
{
array[i]=value;//get values and put it in array.
lcd_gotoxy(i+1,1);//increament lcd cursor position according to i.
printf(lcd_putc,"%lu",value);
i++;//
j=j-1;//for switch case
if(i>5)//restrict to only 5 digits.
{
i=5;
}
}
}
}
}
int readkeypad (void)
{
output_bit (r1, 0);
output_bit (r2, 0);
output_bit (r3, 0);
output_bit (r4, 0);
output_bit (r1, 1);
delay_ms(10);
IF (input (c1)) RETURN 10;
IF (input (c2)) RETURN 0;
IF (input (c3)) RETURN 11;
IF (input (c4)) RETURN 12;
output_bit (r1, 0);
output_bit (r2, 1);
delay_ms(10);
IF (input (c1)) RETURN 7;
IF (input (c2)) RETURN 8;
IF (input (c3)) RETURN 9;
IF (input (c4)) RETURN 13;
output_bit (r2, 0);
output_bit (r3, 1);
delay_ms(10);
IF (input (c1)) RETURN 4;
IF (input (c2)) RETURN 5;
IF (input (c3)) RETURN 6;
IF (input (c4)) RETURN 14;
output_bit (r3, 0);
output_bit (r4, 1);
delay_ms(10);
IF (input (c1)) RETURN 1;
IF (input (c2)) RETURN 2;
IF (input (c3)) RETURN 3;
IF (input (c4)) RETURN 15;
output_bit (r4, 0);
RETURN 255;
}
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