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Calculator Project

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sshahryiar

Joined: 05 May 2010
Posts: 94
Location: Dhaka, Bangladesh

Calculator Project

Posted: Sat Feb 20, 2016 9:35 pm

This is a simple calculator made with 7 segment display and a 4x4 keypad. Currently only integral calculations are supported.

keypad.h

Code:

#define col1       pin_A1
#define col2       pin_A2
#define col3       pin_A3
#define col4       pin_A5
#define col5       pin_E0
#define col6       pin_E1
#define col7       pin_E2
#define col8       pin_C0

#define sw0          !input(pin_B0)
#define sw1 !input(pin_B2)
#define sw2          !input(pin_B4)
#define sw3          !input(pin_B5)

#use fast_io(A)
#use fast_io(B)
#use fast_io(C)
#use fast_io(D)
#use fast_io(E)

const unsigned char num[0x0A] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F};

unsigned char buffer[0x08] = {0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40};

unsigned char pos = 0x00;
unsigned char key = 0xFF;

short key_pressed = FALSE;

void segmented_display_init();
void clear_buffer();

keypad.c

Code:

#include "keypad_display.h"

void display_keypad_init()
{
set_TRIS_A(0xD1);
set_TRIS_B(0xFF);
set_TRIS_C(0xFE);
set_TRIS_D(0x00);
set_TRIS_E(0xF0);

output_D(0x00);

setup_comparator(NC_NC_NC_NC);
setup_SPI(SPI_disabled | SPI_SS_disabled);
setup_ADC(ADC_off);
setup_ADC_ports(no_analogs);

port_B_pullups(FALSE);

setup_timer_0(T0_internal | T0_div_64 | T0_8_bit);
set_timer0(0xD8);

enable_interrupts(GLOBAL);
enable_interrupts(INT_RTCC);
}

#int_RTCC

void scan_display()
{
set_timer0(0xD8);
output_D(buffer[pos]);

switch(pos)
{
   case 7:
   {
      output_high(col1);
      output_low(col2);
      output_low(col3);
      output_low(col4);
      output_low(col5);
      output_low(col6);
      output_low(col7);
      output_low(col8);

      if(sw0)
      {
         key_pressed = TRUE;
         key = 0x01;
      }
      if(sw1)
      {
         key_pressed = TRUE;
         key = 0x02;
      }
      if(sw2)
      {
         key_pressed = TRUE;
         key = 0x03;
      }
      if(sw3)
      {
         key_pressed = TRUE;
         key = 0x0A;
      }

      break;
   }

   case 6:
   {
      output_high(col2);
      output_low(col1);
      output_low(col3);
      output_low(col4);
      output_low(col5);
      output_low(col6);
      output_low(col7);
      output_low(col8);

      if(sw0)
      {
         key_pressed = TRUE;
         key = 0x04;
      }
      if(sw1)
      {
         key_pressed = TRUE;
         key = 0x05;
      }
      if(sw2)
      {
         key_pressed = TRUE;
         key = 0x06;
      }
      if(sw3)
      {
         key_pressed = TRUE;
         key = 0x0B;
      }

      break;
   }

   case 5:
   {
      output_high(col3);
      output_low(col1);
      output_low(col2);
      output_low(col4);
      output_low(col5);
      output_low(col6);
      output_low(col7);
      output_low(col8);

      if(sw0)
      {
         key_pressed = TRUE;
         key = 0x07;
      }
      if(sw1)
      {
         key_pressed = TRUE;
         key = 0x08;
      }
      if(sw2)
      {
         key_pressed = TRUE;
         key = 0x09;
      }
      if(sw3)
      {
         key_pressed = TRUE;
         key = 0x0C;
      }

      break;
   }

   case 4:
   {
      output_high(col4);
      output_low(col1);
      output_��428col2);
      output_low(col3);
      output_low(col5);
      output_low(col6);
      output_low(col7);
      output_low(col8);

      if(sw0)
      {
         key_pressed = TRUE;
         key = 0x0F;
      }
      if(sw1)
      {
         key_pressed = TRUE;
         key = 0x00;
      }
      if(sw2)
      {
         key_pressed = TRUE;
         key = 0x0E;
      }
      if(sw3)
      {
         key_pressed = TRUE;
         key = 0x0D;
      }

      break;
   }

   case 3:
   {
      output_high(col5);
      output_low(col1);
      output_low(col2);
      output_low(col3);
      output_low(col4);
      output_low(col6);
      output_low(col7);
      output_low(col8);
      break;
   }

   case 2:
   {
      output_high(col6);
      output_low(col1);
      output_low(col2);
      output_low(col3);
      output_low(col4);
      output_low(col5);
      output_low(col7);
      output_low(col8);
      break;
   }

   case 1:
   {
      output_high(col7);
      output_low(col1);
      output_low(col2);
      output_low(col3);
      output_low(col4);
      output_low(col5);
      output_low(col6);
      output_low(col8);
      break;
   }

   case 0:
   {
      output_high(col8);
      output_low(col1);
      output_low(col2);
      output_low(col3);
      output_low(col4);
      output_low(col5);
      output_low(col6);
      output_low(col7);
      break;
   }
}

pos++;

if(pos >= 8)
{
   pos = 0;
}
}

void clear_buffer()
{
memset(buffer, 0x00, sizeof(buffer));
}

Main code

Code:

#include <16F877A.h>

#device *= 16

#fuses HS, PUT, PROTECT, CPD, NODEBUG, NOLVP, NOWDT, NOWRT, BROWNOUT

#use delay (clock = 10MHz)

#include "keypad_display.c"

#define no_op          0x0E
#define add             0x0A
#define sub             0x0B
#define mul             0x0C
#define div             0x0D

unsigned char operation = 0x00;

void setup();
unsigned long long get_number(short num_sel);
void show_value(signed long long value);
unsigned long long power(unsigned char value);

void main()
{
signed long long num1 = 0;
signed long long num2 = 0;

setup();

while(TRUE)
{
   while(key != 0x0F);

   num1 = get_number(TRUE);
   show_value(num1);
   delay_ms(1000);

   num2 = get_number(FALSE);
   show_value(num2);
   delay_ms(1000);

   switch(operation)
   {
      case add:
      {
      show_value((num1 + num2));
      break;
      }
      case sub:
      {
      show_value((num1 - num2));
      break;
      }
      case mul:
      {
      show_value((num1 * num2));
      break;
      }
      case div:
      {
      show_value((num1 / num2));
      break;
      }
      case no_op:
      {
      show_value(19999999);
      break;
      }
   }
};
}

void setup()
{
disable_interrupts(GLOBAL);
setup_timer_1(T1_disabled);
setup_timer_2(T2_disabled, 255, 1);
set_timer1(0x0000);
set_timer2(0x00);
setup_CCP1(CCP_off);
setup_CCP2(CCP_off);
display_keypad_init();

delay_ms(100);
}

unsigned long long get_number(short num_sel)
{
unsigned char n = 0x00;
unsigned char digits = 0x00;

unsigned long long number = 0;

unsigned char value[8];

memset(value, 0x00, sizeof(value));
clear_buffer();

while(TRUE)
{
   if(key_pressed)
   {
      if((key >= 0) && (key <= 9))
      {
      buffer[n] = num[key];
      value[n] = key;
      n++;
      digits++;
      }
      delay_ms(400);
      key_pressed = FALSE;

      if((n >= 7) || ((key >= 0x0A) && (key <= 0x0E)))
      {
if(num_sel == TRUE)
{
operation = key;
}
      break;
      }
   }
};

for(n = 1; n <= digits; n++)
{
number += value[(n - 1)] * power(digits - n);
}

return number;
}

void show_value(signed long long value)
{
unsigned char ch = 0;

clear_buffer();

if(value < 0)
{
   value = -value;
   buffer[0] = 0x40;
}

if((value >= 0) && (value <= 9))
{
   ch = value;
   buffer[7] = num[ch];
}

else if((value > 9) && (value <= 99))
{
   ch = (value / 10);
   buffer[6] = num[ch];
   ch = (value % 10);
   buffer[7] = num[ch];
}

else if((value > 99) && (value <= 999))
{
   ch = (value / 100);
   buffer[5] = num[ch];
   ch = ((value / 10) % 10);
   buffer[6] = num[ch];
   ch = (value % 10);
   buffer[7] = num[ch];
}

else if((value > 999) && (value <= 9999))
{
   ch = (value / 1000);
   buffer[4] = num[ch];
   ch = ((value / 100) % 10);
   buffer[5] = num[ch];
   ch = ((value / 10) % 10);
   buffer[6] = num[ch];
   ch = (value % 10);
   buffer[7] = num[ch];
}

else if((value > 9999) && (value <= 99999))
{
   ch = (value / 10000);
   buffer[3] = num[ch];
   ch = ((value / 1000) % 10);
   buffer[4] = num[ch];
   ch = ((value / 100) % 10);
   buffer[5] = num[ch];
   ch = ((value / 10) % 10);
   buffer[6] = num[ch];
   ch = (value % 10);
   buffer[7] = num[ch];
}

else if((value > 99999) && (value <= 999999))
{
   ch = (value / 100000);
   buffer[2] = num[ch];
   ch = ((value / 10000) % 10);
   buffer[3] = num[ch];
   ch = ((value / 1000) % 10);
   buffer[4] = num[ch];
   ch = ((value / 100) % 10);
   buffer[5] = num[ch];
   ch = ((value / 10) % 10);
   buffer[6] = num[ch];
   ch = (value % 10);
   buffer[7] = num[ch];
}

else if((value > 999999) && (value <= 9999999))
{
   ch = (value / 1000000);
   buffer[1] = num[ch];
   ch = ((value / 100000) % 10);
   buffer[2] = num[ch];
   ch = ((value / 10000) % 10);
   buffer[3] = num[ch];
   ch = ((value / 1000) % 10);
   buffer[4] = num[ch];
   ch = ((value / 100) % 10);
   buffer[5] = num[ch];
   ch = ((value / 10) % 10);
   buffer[6] = num[ch];
   ch = (value % 10);
   buffer[7] = num[ch];
}

else
{
   memset(buffer, 0x40, sizeof(buffer));
}
}

unsigned long long power(unsigned char value)
{
unsigned char p = 0;
unsigned long long temp = 1;

for(p = 0; p < value; p++)
{
   temp *= 10;
}

return temp;
}

Project demo video

https://www.youtube.com/watch?v=ZrfTvYYNqcA
_________________
https://www.facebook.com/MicroArena

SShahryiar

Jerson

Joined: 31 Jul 2009
Posts: 125
Location: Bombay, India

Posted: Sun Feb 21, 2016 1:02 am

There is ghosting in your numbers. I suggest you do the scan this way.

Example for only one digit is shown here.

Code:

void scan_display()
{
set_timer0(0xD8);
output_D(0x00); // 0x00 turns off the segments by looking at your numtable

switch(pos)
{
case 7:
{
output_high(col1);
output_low(col2);
output_low(col3);
output_low(col4);
output_low(col5);
output_low(col6);
output_low(col7);
output_low(col8);

.......
} // end of switch
output_D(buffer[pos]); // now turn on the segments

sshahryiar

Joined: 05 May 2010
Posts: 94
Location: Dhaka, Bangladesh

ghost
Posted: Sun Feb 21, 2016 1:09 am

Thanks for the tip.... _________________ https://www.facebook.com/MicroArena SShahryiar

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