72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
// mouse.c
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// 10/03/03
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// Author: Josh Holtrop
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#include "mouse.h"
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#include "hos_defines.h"
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#include "video/video.h"
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#include "sys/io.h"
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#define MOUSE_BUFFER_LENGTH 16
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int mouse_x;
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int mouse_y;
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int mouse_bytesRead = 0;
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byte mouse_inbuffer[MOUSE_BUFFER_LENGTH];
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//This method initializes the ps/2 mouse
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void mouse_init()
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{
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outportb(0x64, 0x20); //tell keyboard controller we are going to read keyboard controller command byte
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byte temp = inportb(0x60); //read keyboard controller command byte
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outportb(0x64, 0x60); //tell keyboard controller we are going to write keyboard controller command byte
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outportb(0x60, 0x03 | (temp&0x40)); //write keyboard controller command byte: enable mouse/keyboard ints, include original XLATE bit from temp (bit6)
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outportb(0x64, 0xA8); //enable mouse port
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outportb(0x64, 0xD4); //send command to mouse, not kbd
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outportb(0x60, 0xF4); //enable data reporting
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mouse_x = video_getWidth() >> 1;
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mouse_y = video_getHeight() >> 1;
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//outportb(0x64, 0xD4);
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//outportb(0x60, 0xE7); //scaling 2:1
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}
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//This method is called when a mouse interrupt occurs
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void isr_mouse()
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{
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byte inb = inportb(0x60); //read mouse byte
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if ((inb == 0xFA) && (mouse_bytesRead < 1)) //ACK
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return;
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mouse_inbuffer[mouse_bytesRead] = inb;
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mouse_bytesRead++;
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if (mouse_bytesRead == 3) //complete packet received
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{
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mouse_bytesRead = 0;
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int adjx = (char) mouse_inbuffer[1];
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int adjy = (char) mouse_inbuffer[2];
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mouse_x += adjx;
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mouse_y -= adjy; //-= because screen y coordinates are opposite mouse y coordinates
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if (mouse_x < 0)
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mouse_x = 0;
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if (mouse_x >= video_getWidth())
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mouse_x = video_getWidth() - 1;
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if (mouse_y < 0)
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mouse_y = 0;
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if (mouse_y >= video_getHeight())
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mouse_y = video_getHeight() - 1;
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if (mouse_inbuffer[0] & 0x01) //left button
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video_pset(mouse_x, mouse_y, 0x00FF8800);
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else
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video_pset(mouse_x, mouse_y, 0x00FFFFFF);
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}
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}
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