Altera DE2-115 Uživatelská příručka stáhnout pdf (Strana 83)

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

 For touch display, different cases are referred for each option selected, which is discussed in

the next section.

alt_touchscreen_get_pen(screen, (&pen_data.pen_down), (&pen_data.x), (&pen_data.y));

if (PtInRect(&rcPlus, pen_data.x, pen_data.y)){

select = 0;

}

if (PtInRect(&rcMinus, pen_data.x, pen_data.y)){

select = 1;

}

if (PtInRect(&rcAnd, pen_data.x, pen_data.y)){

select = 2;

}

if (PtInRect(&rcOr, pen_data.x, pen_data.y)){

select = 3;

}

 For different ALU options, case statements are used.

switch (select)

{

case 0:

result = number1 + number2;

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

printf ("%d + %d = %d ",number1,number2,result);

vid_print_string_alpha(400, 300, COLOR_WHITE, COLOR_BLACK, tahomabold_20, display,

szText);

break;

case 1:

result = number1 - number2;

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

printf ("%d - %d = %d ",number1,number2,result);

vid_print_string_alpha(400, 300, COLOR_WHITE, COLOR_BLACK, tahomabold_20, display,

szText);

break;

case 2:

result = number1 & number2;

sprintf (szText,"%d (&) %d = %d ",number1,number2,result);

printf ("%d & %d = %d ",number1,number2,result);

vid_print_string_alpha(400, 300, COLOR_WHITE, COLOR_BLACK, tahomabold_20, display,

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 106 107

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Altera DE2-115 Uživatelská příručka Strana 83