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96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/*****************************************************************************/
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/* */
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/* Watara Supervision sample C program */
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/* */
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/* Fabrizio Caruso (fabrizio_caruso@hotmail.com), 2019 */
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/* Greg King (greg.king5@verizon.net), 2021 */
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/* */
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/*****************************************************************************/
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#include <supervision.h>
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#include <string.h>
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/* Number of words per screen line (Remark: Last 4 words aren't displayed) */
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#define WORDS_PER_LINE (160/8+4)
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struct sv_vram {
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unsigned int v[160/8][8][WORDS_PER_LINE];
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};
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#define SV_VRAM ((*(struct sv_vram *)0x4000).v)
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/* Character definitions in 8x8 format */
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/* That format gives us a screen of 20 columns and 20 rows */
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static const unsigned char h_char[] = {0x66,0x66,0x66,0x7E,0x66,0x66,0x66,0x00};
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static const unsigned char e_char[] = {0x7E,0x60,0x60,0x78,0x60,0x60,0x7E,0x00};
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static const unsigned char l_char[] = {0x60,0x60,0x60,0x60,0x60,0x60,0x7E,0x00};
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static const unsigned char o_char[] = {0x3C,0x66,0x66,0x66,0x66,0x66,0x3C,0x00};
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static const unsigned char w_char[] = {0x63,0x63,0x63,0x6B,0x7F,0x77,0x63,0x00};
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static const unsigned char r_char[] = {0x7C,0x66,0x66,0x7C,0x78,0x6C,0x66,0x00};
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static const unsigned char d_char[] = {0x78,0x6C,0x66,0x66,0x66,0x6C,0x78,0x00};
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static void clear_screen(void)
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{
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memset(SV_VIDEO, 0, 0x2000);
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}
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/* Necessary conversion to have 2 bits per pixel with darkest hue */
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/* Remark: The Supervision uses 2 bits per pixel, and bits are mapped into pixels in reversed order */
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static unsigned int __fastcall__ double_reversed_bits(unsigned char)
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{
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__asm__("stz ptr2");
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__asm__("stz ptr2+1");
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__asm__("ldy #$08");
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L1: __asm__("lsr a");
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__asm__("php");
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__asm__("rol ptr2");
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__asm__("rol ptr2+1");
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__asm__("plp");
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__asm__("rol ptr2");
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__asm__("rol ptr2+1");
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__asm__("dey");
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__asm__("bne %g", L1);
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__asm__("lda ptr2");
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__asm__("ldx ptr2+1");
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return __AX__;
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}
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static void display_char(const unsigned char x, const unsigned char y, const unsigned char *ch)
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{
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unsigned char k;
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for(k=0;k<8;++k)
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{
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SV_VRAM[y][k][x] = double_reversed_bits(ch[k]);
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}
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}
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static void init_lcd(void)
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{
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SV_LCD.width = 160;
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SV_LCD.height = 160;
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}
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static void hello(unsigned char x, unsigned char y)
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{
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display_char(x+ 0,y,h_char);
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display_char(x+ 1,y,e_char);
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display_char(x+ 2,y,l_char);
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display_char(x+ 3,y,l_char);
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display_char(x+ 4,y,o_char);
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display_char(x+ 6,y,w_char);
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display_char(x+ 7,y,o_char);
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display_char(x+ 8,y,r_char);
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display_char(x+ 9,y,l_char);
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display_char(x+10,y,d_char);
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}
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void main(void)
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{
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init_lcd();
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clear_screen();
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hello(2,3);
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hello(7,16);
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}
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