Altera DE2-115 User's Guide download pdf (Page 65)

SFSU - Embedded Systems Tutorial Nano- Electronics & Computing Research Lab

Basic Software Algorithm

Initialize the screen

screen_x = 319; screen_y = 239;

char text[16];

color = 0x0000; // black color

VGA_box (0, 0, screen_x, screen_y, color); // fill the screen with background

Values of switches are pointed by allocating their base address

volatile int * switch1_ptr = (int *) 0x00101810;

volatile int * switch2_ptr = (int *) 0x00101820;

volatile int * switch3_ptr = (int *) 0x00101830;

volatile int * switch4_ptr = (int *) 0x00101850;

According to the switch position, the operation of ALU is decided.

00 : Addition

01: Subtraction

10: Logical OR

11 : Logical And

if (sel1&sel2)

{

sprintf( text_top_VGA, "My ALU");

sprintf (text,"%d + %d = %d ",number1,number2,number1 + number2);

}

else if (!sel1&sel2)

{

sprintf( text_top_VGA, "My ALU");

sprintf (text,"%d - %d = %d ",number1,number2,number1 - number2);

}

else if (sel1&!sel2)

{

sprintf( text_top_VGA, "My ALU");

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Altera DE2-115 User's Guide Page 65