xtest04_4.c

AT91sam7s 256 B/D example

/* ========================================================================== */
/*	   Xtest04_4.c : Integer Number Display without and with Sign	      */
/* ========================================================================== */
/*			  Designed and programmed by Duck-Yong Yoon in 2007.  */

#include <stdlib.h>
#include "AT91SAM7S256.h"
#include "lib_AT91SAM7S256.h"
#include "OK7S256ads.h"

void LCD_2d(unsigned int number)		/* display 2-digit decimal number */
{ unsigned char i;

  i = number/10;				// 10^1
  if(i == 0) LCD_data(' ');
  else       LCD_data(i + '0');

  i = number % 10;				// 10^0
  LCD_data(i + '0');
}

void LCD_s2d(signed int number)			/* display signed 2-digit decimal number */
{
  if(number >= 0)				// sign
    LCD_data('+');
  else
    LCD_data('-');

  LCD_2d(abs(number));				// magnitude
}

void LCD_4d(unsigned int number)		/* display 4-digit decimal number */
{ unsigned int i, flag;

  flag = 0;
  i = number/1000;				// 10^3
  if(i == 0) LCD_data(' ');
  else {     LCD_data(i + '0');
             flag = 1;
       }

  number = number % 1000;			// 10^2
  i = number/100;
  if((i == 0) && (flag == 0))
             LCD_data(' ');
  else {     LCD_data(i + '0');
             flag = 1;
       }

  number = number % 100;			// 10^1
  i = number/10;
  if((i == 0) && (flag == 0))
             LCD_data(' ');
  else {     LCD_data(i + '0');
             flag = 1;
       }

  i = number % 10;				// 10^0
  LCD_data(i + '0');
}

void LCD_s4d(signed int number)			/* display signed 4-digit decimal number */
{
  if(number >= 0)				// sign
    LCD_data('+');
  else
    LCD_data('-');

  LCD_4d(abs(number));				// magnitude
}

int main(void)
{
  unsigned int i, j;
  signed int x, y;

  MCU_initialize();				// initialize AT91SAM7S256 & kit
  Delay_ms(50);					// wait for system stabilization
  LCD_initialize();				// initialize text LCD

  while(1)
    { LCD_string(0x80," UNSIGNED MULTI ");	// multiplication without sign
      LCD_string(0xC0," 00 x 00 = 0000 ");
      Beep();
      
      for(i = 10; i <= 90; i += 10)
        for(j = 10; j <= 90; j += 10)
          { LCD_command(0xC1); LCD_2d(i);	// display multiplicand
            LCD_command(0xC6); LCD_2d(j);	// display multiplier
            LCD_command(0xCB); LCD_4d(i*j);	// display multiplication
            Delay_ms(1000);
          }

      LCD_string(0x80,"  SIGNED MULTI  ");	// multiplication with sign
      LCD_string(0xC0,"+00x(+00)= +0000");
      Beep();

      for(x = -90; x <= +90; x += 10)
        for(y = -90; y <= +90; y += 10)
          { LCD_command(0xC0); LCD_s2d(x);	// display multiplicand
            LCD_command(0xC5); LCD_s2d(y);	// display multiplier
            LCD_command(0xCB); LCD_s4d(x*y);	// display multiplication
            Delay_ms(1000);
          }
    }
}