package oebb;
import com.jopdesign.sys.Native;
/**
* Scan keyboard.
*/
public class Keyboard {
public static final int C = 1;
public static final int B = 56;
public static final int E = 4;
public static final int UP = 40;
public static final int DOWN = 24;
public static final int BLACK = 8;
public static final int K0 = 2;
public static final int K1 = 49;
public static final int K2 = 50;
public static final int K3 = 52;
public static final int K4 = 33;
public static final int K5 = 34;
public static final int K6 = 36;
public static final int K7 = 17;
public static final int K8 = 18;
public static final int K9 = 20;
private static int io_addr;
public static boolean pressed;
private static int key;
private static int cnt;
private static int new_key;
public static void init(int addr) {
io_addr = addr;
key = 0;
cnt = 0;
}
/*
key_inv <= not key_in;
key_out(0) <= 'Z' when key_oc(0)='0' else '0';
key_out(1) <= 'Z' when key_oc(1)='0' else '0';
key_out(2) <= 'Z' when key_oc(2)='0' else '0';
key_out(3) <= 'Z' when key_oc(3)='0' else '0';
*/
static void loop() {
int val = Native.rd(io_addr);
if (new_key==0 && val!=0) {
new_key = (cnt<<4)+val;
}
++cnt;
if (cnt==4) {
cnt = 0;
if (new_key==0) {
pressed = false;
} else if (new_key!=key) {
pressed = true;
}
key = new_key;
new_key = 0;
}
Native.wr(0x01<<cnt, io_addr);
}
static int rd() {
if (pressed) {
pressed = false;
return key;
} else {
return -1;
}
}
/** get value without consuming it */
static int peek() {
if (pressed) {
return key;
} else {
return -1;
}
}
static void unread(int val) {
key = val;
pressed = true;
}
public static int num(int val) {
if (val==K0) return 0;
if (val==K1) return 1;
if (val==K2) return 2;
if (val==K3) return 3;
if (val==K4) return 4;
if (val==K5) return 5;
if (val==K6) return 6;
if (val==K7) return 7;
if (val==K8) return 8;
if (val==K9) return 9;
return -1;
}
}