43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
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/*
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This is a demonstration of the TMS9928A's
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40 x 24 monochrome text mode.
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*/
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#include <cv.h>
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#include <cvu.h>
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#include "common.h"
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//#link "common.c"
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//#link "fonts.s"
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void setup_text_mode() {
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// set screen mode to text
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cv_set_screen_mode(CV_SCREENMODE_TEXT);
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// set image table address, which defines grid of characters
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cv_set_image_table(IMAGE);
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// set pattern table address, which defines character graphics
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cv_set_character_pattern_t(PATTERN);
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// clear VRAM to all zeroes
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cvu_vmemset(0, 0, 0x4000);
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// copy default character set from ROM to VRAM
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copy_default_character_set();
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}
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void show_text() {
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// set background and foreground colors
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cv_set_colors(CV_COLOR_LIGHT_GREEN, CV_COLOR_BLACK);
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// fill image table with '.' characters
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cvu_vmemset(IMAGE, '.', 40*24);
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// draw message at row 0, column 1
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cvu_memtovmemcpy(IMAGE + 1, "Greetings Professor Falken", 26);
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// turn on display
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cv_set_screen_active(true);
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}
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void main() {
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setup_text_mode();
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show_text();
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while (1); // infinite loop
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}
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