61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
#include "fifo.h"
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#include "io.h"
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#include "keyboard.h"
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#include "mouse.h"
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struct FIFO8 mousefifo;
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unsigned char mousebuf[MOUSE_FIFO_BUF_SIZE];
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void enable_mouse(struct MouseDec *mdec) {
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wait_KBC_sendready();
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io_out8(PORT_KEYCMD, KEYCMD_SENDTO_MOUSE);
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wait_KBC_sendready();
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io_out8(PORT_KEYDAT, MOUSECMD_ENABLE);
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mdec->phase = 0;
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}
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int mouse_decode(struct MouseDec *mdec, unsigned char dat) {
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if (mdec->phase == 0) {
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// 等待鼠标的0xfa状态
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if (dat == 0xfa) {
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mdec->phase = 1;
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}
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return 0;
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} else if (mdec->phase == 1) {
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// 等待鼠标的第一个字节
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if ((dat & 0xc8) == 0x08) {
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// 如果第一个字节正确
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mdec->buf[0] = dat;
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mdec->phase = 2;
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}
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return 0;
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} else if (mdec->phase == 2) {
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// 等待鼠标的第二个字节
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mdec->buf[1] = dat;
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mdec->phase = 3;
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return 0;
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} else if (mdec->phase == 3) {
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// 等待鼠标的第三个字节
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mdec->buf[2] = dat;
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mdec->phase = 1;
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mdec->btn = mdec->buf[0] & 0x07;
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mdec->x = mdec->buf[1];
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mdec->y = mdec->buf[2];
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if ((mdec->buf[0] & 0x10) != 0) {
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mdec->x |= 0xffffff00;
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}
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if ((mdec->buf[0] & 0x20) != 0) {
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mdec->y |= 0xffffff00;
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}
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mdec->y = -mdec->y; // 鼠标的y方向与画面符号相反
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return 1;
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}
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return -1;
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}
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