xtest04_5.c

AT91sam7s 256 B/D example

/* ========================================================================== */
/*	   Xtest04_5.c : Real Number Display without and with Sign	      */
/* ========================================================================== */
/*			  Designed and programmed by Duck-Yong Yoon in 2007.  */

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

void LCD_1d1(double number)			/* floating-point number x.x */
{ unsigned int i, j;

  j = (int)(number*10. + 0.5);
  i = j / 10;					// 10^0
  LCD_data(i + '0');
  LCD_data('.');
  i = j % 10;					// 10^-1
  LCD_data(i + '0');
}

void LCD_s1d1(double number)			/* floating-point number +x.x */
{
  if(number >= 0.)				// sign
    LCD_data('+');
  else
    LCD_data('-');

  LCD_1d1(fabs(number));			// magnitude
}

void LCD_2d2(double number)			/* floating-point number xx.xx */
{ unsigned int i, j;

  j = (int)(number*100. + 0.5);
  i = j / 1000;					// 10^1
  if(i == 0) LCD_data(' ');
  else       LCD_data(i + '0');

  j = j % 1000;					// 10^0
  i = j / 100;
  LCD_data(i + '0');
  LCD_data('.');

  j = j % 100;					// 10^-1
  i = j / 10;
  LCD_data(i + '0');

  i = j % 10;					// 10^-2
  LCD_data(i + '0');
}

void LCD_s2d2(double number)			/* floating-point number +xx.xx */
{
  if(number >= 0.)				// sign
    LCD_data('+');
  else
    LCD_data('-');

  LCD_2d2(fabs(number));			// magnitude
}

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

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

  while(1)
    { LCD_string(0x80,"  FLOAT NUMBER  ");	// multipllication without sign
      LCD_string(0xC0,"0.0 x 0.0 =00.00");
      Beep();

      for(i = 1.1; i <= 9.9; i += 1.1)
        { for(j = 1.1; j <= 9.9; j += 1.1)
            { LCD_command(0xC0); LCD_1d1(i);	// display multiplicand
              LCD_command(0xC6); LCD_1d1(j);	// display multiplier
              LCD_command(0xCB); LCD_2d2(i*j);	// display multiplication
              Delay_ms(1000);
            }
        }

      LCD_string(0x80," (+0.0)x(+0.0)  ");	// multiplication with sign
      LCD_string(0xC0,"   = +00.00     ");
      Beep();

      for(x = -9.9; x <= 9.9; x += 1.1)
        { for(y = -9.9; y <= 9.9; y += 1.1)
            { LCD_command(0x82); LCD_s1d1(x);	// display multiplicand
              LCD_command(0x89); LCD_s1d1(y);	// display multiplier
              LCD_command(0xC5); LCD_s2d2(x*y);	// display multiplication
              Delay_ms(1000);
            }
        }
    }
}