mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2024-12-25 00:31:04 +00:00
43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
|
|
/*
|
|
This is a demonstration of the TMS9928A's
|
|
40 x 24 monochrome text mode.
|
|
*/
|
|
|
|
#include <cv.h>
|
|
#include <cvu.h>
|
|
|
|
#include "common.h"
|
|
//#link "common.c"
|
|
//#link "fonts.s"
|
|
|
|
void setup_text_mode() {
|
|
// set screen mode to text
|
|
cv_set_screen_mode(CV_SCREENMODE_TEXT);
|
|
// set image table address, which defines grid of characters
|
|
cv_set_image_table(IMAGE);
|
|
// set pattern table address, which defines character graphics
|
|
cv_set_character_pattern_t(PATTERN);
|
|
// clear VRAM to all zeroes
|
|
cvu_vmemset(0, 0, 0x4000);
|
|
// copy default character set from ROM to VRAM
|
|
copy_default_character_set();
|
|
}
|
|
|
|
void show_text() {
|
|
// set background and foreground colors
|
|
cv_set_colors(CV_COLOR_LIGHT_GREEN, CV_COLOR_BLACK);
|
|
// fill image table with '.' characters
|
|
cvu_vmemset(IMAGE, '.', 40*24);
|
|
// draw message at row 0, column 1
|
|
cvu_memtovmemcpy(IMAGE + 1, "Greetings Professor Falken", 26);
|
|
// turn on display
|
|
cv_set_screen_active(true);
|
|
}
|
|
|
|
void main() {
|
|
setup_text_mode();
|
|
show_text();
|
|
while (1); // infinite loop
|
|
}
|