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keyboard.c
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keyboard.c
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#include "keyboard.h"
#include "io.h"
#include "memory.h"
static uint8 *ringbuf=0;
static uint32 ringstart=0, ringend=0, ringsize=1024;
void key_decode(uint8 *key, bool *pressed)
{
uint8 c;
uint32 ringoldstart = ringstart;
*key='x';
*pressed=false;
if (ringstart == ringend) return;
c=ringbuf[ringstart++];
if (ringstart==ringsize) ringstart=0;
if (c == 0xe0) {
if (ringstart == ringend) {
ringstart = ringoldstart;
return;
};
c = ringbuf[ringstart++];
if (ringstart == ringsize) ringstart=0;
*pressed = ((c&0x80) == 0) ? true : false;
c &= ~0x80;
if (c==0x4d) *key='>';
if (c==0x4b) *key='<';
if (c==0x48) *key='^';
if (c==0x50) *key='v';
if (c==0x49) *key='u';
if (c==0x51) *key='d';
}else{
*pressed = ((c&0x80) == 0) ? true : false;
c &= ~0x80;
if ((c>=0x3b) && (c<=0x44)) *key=c-0x3b+'0';
if (c==0x2a) *key='l';
if (c==0x36) *key='r';
if (c==1) *key='@';
if (c==0x1c) *key='e';
if (c==0x39) *key=' ';
if (c==0x19) *key='p';
};
};
void key_polling()
{
if (inb(0x64)&1) {
ringbuf[ringend++] = inb(0x60);
if (ringend==ringsize) ringend=0;
};
};
void key_initialize()
{
ringbuf = malloc (ringsize);
};