Bridgetek FT801 - Writing display lists

FT800 Series Programmer Guide
Version 2.1
Document Reference No.: BRT_000030 Clearance No.: BRT#037
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2.5.4 Writing display lists
Writing display list entries with wr32() is time-consuming and error-prone, so instead a
function might be used:
static size_t dli;
static void dl(unsigned long cmd)
{
wr32(RAM_DL + dli, cmd);
dli += 4;
}
...
dli = 0; // start writing the display list
dl(CLEAR(1, 1, 1)); // clear screen
dl(BEGIN(BITMAPS)); // start drawing bitmaps
dl(VERTEX2II(220, 110, 31, 'F')); // ascii F in font 31
dl(VERTEX2II(244, 110, 31, 'T')); // ascii T
dl(VERTEX2II(270, 110, 31, 'D')); // ascii D
dl(VERTEX2II(299, 110, 31, 'I')); // ascii I
dl(END());
dl(COLOR_RGB(160, 22, 22)); // change color to red
dl(POINT_SIZE(320)); // set point size
dl(BEGIN(POINTS)); // start drawing points
dl(VERTEX2II(192, 133, 0, 0)); // red point
dl(END());
dl(DISPLAY()); // display the image
Code snippet 9 dl function definition