78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
#include "genesis.h"
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#define MOUSE_PORT ((volatile u8*)0xA10003)
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#define Z80_HALT *((volatile u16*)0xA11100)
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#define MOUSE_DELAY 32
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static inline void delay(void) {
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__asm__ volatile (
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"move.w %0,%%d0\n\t"
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"1: subq.w #1,%%d0\n\t"
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"bne.s 1b"
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:
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: "i"(MOUSE_DELAY)
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: "d0"
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);
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}
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int main() {
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VDP_setTextPlane(0);
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VDP_drawText("Sega Mega Mouse RAW reader", 7, 27);
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VDP_drawText("RAW nibbles:", 14,0);
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u8 nibbles[16] = {0};
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s16 x = 0;
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s16 y = 0;
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char buf[40]; //буфер строки для вывода на экран
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while(TRUE) {
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SYS_doVBlankProcess();
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VDP_clearTextArea(0, 1, 40, 13);
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//опрос мыши
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Z80_HALT = 0x0100;
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*MOUSE_PORT = 0x60; delay();
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nibbles[0] = *MOUSE_PORT & 0x0F;
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for(int i=1;i<10;i++) {
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*MOUSE_PORT = (i&1)?0x20:0x00;
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delay();
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nibbles[i] = *MOUSE_PORT & 0x0F;
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delay();
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}
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*MOUSE_PORT = 0x60; delay();
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Z80_HALT = 0x0000;
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//конец опроса мыши
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// выводим нибблы на экран
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sprintf(buf, "%X%X%X%X %X %X %X%X %X%X", nibbles[0],nibbles[1],nibbles[2],nibbles[3],nibbles[4],nibbles[5],nibbles[6],nibbles[7],nibbles[8],nibbles[9]);
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VDP_drawText(buf, 13,1);
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//считаем dx dy
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s16 dx = (nibbles[6] << 4) | nibbles[7];
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s16 dy = (nibbles[8] << 4) | nibbles[9];
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if (nibbles[4]&8) dy = 255;
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if (nibbles[4]&4) dx = 255;
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if (nibbles[4]&2) dy = dy|0xFF00; //sign-extend to 16-bit
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if (nibbles[4]&1) dx = dx|0xFF00;
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x+=dx;
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y+=dy;
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//выводим на экран полезные данные
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sprintf(buf, "buttons: %c%c%c%c", (nibbles[5]&8&&1)+'0',(nibbles[5]&4&&1)+'0',(nibbles[5]&2&&1)+'0',(nibbles[5]&1&&1)+'0');
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VDP_drawText(buf, 2, 10);
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sprintf(buf, "dx: %+04d dy: %+04d x: %+04d y: %+04d", dx,dy,x,y);
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VDP_drawText(buf, 2, 12);
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}
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return 0;
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}
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