248 lines
6.8 KiB
C
248 lines
6.8 KiB
C
// keyboard.c
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// Author: Josh Holtrop
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// Created: 04/17/03
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// Modified: 08/02/04
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#include "hos_defines.h"
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#include "char/keyboard.h"
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#include "sys/io.h"
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#include "sys/pic.h"
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#include "functions.h"
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#include "kio.h"
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#define KBD_BUFFER_LENGTH 64
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byte kbdFlags = 0; //holds current keyboard flags - caps/num/scroll/shift/ctrl/alt
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byte kbdAscii = 0; //holds ASCII value of a key pressed
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byte kbdScan = 0; //holds the keyboard scan code of a key pressed
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dword kbdBuffer[KBD_BUFFER_LENGTH]; //a buffer for all keypresses
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int kbdBufferStart = 0; //position of next key in buffer
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int kbdBufferLen = 0; //number of keys left in the buffer
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byte kbdExt = 0; //# of extended key codes left to input
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byte kbdExt2 = 0; //# of 2nd-set-extended key codes left to input
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byte ackReason = 0; //used to record the reason why we would get an acknowledge byte (0xFA)
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//these arrays convert a keyboard scan code to an ASCII character value
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//nul esc bksp tab lctl lsft rsft lalt caps F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 numScrlNumPad------- unknown---- F11 F12 unknown....
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const byte SCAN2ASCII[129] = "\000\0331234567890-=\010\011qwertyuiop[]\n\001asdfghjkl;'`\001\\zxcvbnm,./\001*\001 \001\001\001\001\001\001\001\001\001\001\001\001\001\001\001\001-\001\001\001+\001\001\001\001\001\002\002\002\001\001\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002";
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const byte SCAN2ASCIISHIFT[129] = "\000\033!@#$%^&*()_+\010\011QWERTYUIOP{}\n\001ASDFGHJKL:\"~\001|ZXCVBNM<>?\001*\001 \001\001\001\001\001\001\001\001\001\001\001\001\001789-456+1230.\002\002\002\001\001\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002\002";
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//====FUNCTIONS:
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// The Keyboard Interrupt Service Routine
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void isr_keyboard()
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{
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kbdScan = inportb(0x60);
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//printf("\nKEYBOARD INTERRUPT: 0x%x", kbdScan);
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byte inState = inportb(0x61);
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outportb(0x61, inState|0x80);
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outportb(0x61, inState);
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//printf("IRQ 1: %x\n", kbdScan);
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if (kbdScan == 0xFA) //250 //ACKnowledge
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{
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//printf("KBD_ACK 0x%x!\n", ackReason);
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if (ackReason == 0xED) //reset LEDs
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{
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outportb(0x60, (kbdFlags & 0x07));
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}
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ackReason = 0;
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}
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if (kbdScan == 224) //extended key
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{
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kbdExt = 1;
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pic_eoi();
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return;
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}
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if (kbdScan == 225) //2nd-set-extended key
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{
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kbdExt2 = 2;
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pic_eoi();
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return;
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}
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//====handle control keys::
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kbdAscii = 2;
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switch (kbdScan) //control keys
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{
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case KBD_SCAN_LSHIFT:
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kbdFlags |= KBD_SHIFT;
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kbdAscii = 1;
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break;
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case KBD_SCAN_RSHIFT:
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kbdFlags |= KBD_SHIFT;
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kbdAscii = 1;
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break;
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case KBD_SCAN_LCTRL:
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kbdFlags |= KBD_CTRL;
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kbdAscii = 1;
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break;
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case KBD_SCAN_LALT:
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kbdFlags |= KBD_ALT;
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kbdAscii = 1;
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break;
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case KBD_SCAN_LSHIFT + KBD_SCAN_RELEASED:
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kbdFlags &= (KBD_SHIFT ^ 0xFF);
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kbdAscii = 1;
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break;
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case KBD_SCAN_RSHIFT + KBD_SCAN_RELEASED:
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kbdFlags &= (KBD_SHIFT ^ 0xFF);
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kbdAscii = 1;
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break;
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case KBD_SCAN_LCTRL + KBD_SCAN_RELEASED:
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kbdFlags &= (KBD_CTRL ^ 0xFF);
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kbdAscii = 1;
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break;
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case KBD_SCAN_LALT + KBD_SCAN_RELEASED:
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kbdFlags &= (KBD_ALT ^ 0xFF);
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kbdAscii = 1;
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break;
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case KBD_SCAN_CAPS+KBD_SCAN_RELEASED:
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kbdFlags ^= KBD_CAPS;
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kbdAscii = 1;
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kbd_resetLEDs(); //update LEDs
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break;
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case KBD_SCAN_SCROLL+KBD_SCAN_RELEASED:
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kbdFlags ^= KBD_SCROLL;
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kbdAscii = 1;
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kbd_resetLEDs(); //update LEDs
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break;
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case KBD_SCAN_NUM+KBD_SCAN_RELEASED:
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kbdFlags ^= KBD_NUM;
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kbdAscii = 1;
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kbd_resetLEDs(); //update LEDs
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break;
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}
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if (kbdAscii == 1)
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{
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if (kbdExt > 0)
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kbdExt--;
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pic_eoi();
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return;
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}
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//====determine ASCII value of key::
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if (kbdExt > 0) //extended key, kbdScan holds extended key
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{
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kbdExt--;
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kbdAscii = 1;
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switch (kbdScan)
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{
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case KBD_SCANE_ENTER:
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kbdAscii = '\n'; break;
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case 53: // '/' character (divide on numpad)
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kbdAscii = '/'; break;
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}
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}
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else if (kbdExt2 > 0) //extended key 2
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{
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kbdExt2--;
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// if (kbdScan == 69) // (pause|break)
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// kbdAscii = 2; //flag ascii value of 1 means control character (pausebreak)
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// else
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kbdAscii = 2; //flag ascii value of 2 means ignore key (or unknown value)
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}
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else //not an extended key
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{
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// if letter key
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if (((kbdScan >= 16) && (kbdScan <= 25)) || ((kbdScan >= 30) && (kbdScan <= 38)) || ((kbdScan >= 44) && (kbdScan <= 50)))
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{
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// if caps and shift are different (either one pressed, not both)
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if (((kbdFlags & KBD_SHIFT) != 0) & ((kbdFlags & KBD_CAPS) != 0))
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kbdAscii = SCAN2ASCII[kbdScan & 0x7F];
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else if (((kbdFlags & KBD_SHIFT) == 0) & ((kbdFlags & KBD_CAPS) == 0))
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kbdAscii = SCAN2ASCII[kbdScan & 0x7F];
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else
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kbdAscii = SCAN2ASCIISHIFT[kbdScan & 0x7F];
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}
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// if numpad key
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else if ((kbdScan >= 71) && (kbdScan <= 83))
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{
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// if numlock on
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if (kbdFlags & KBD_NUM)
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kbdAscii = SCAN2ASCIISHIFT[kbdScan & 0x7F];
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else
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kbdAscii = SCAN2ASCII[kbdScan & 0x7F];
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}
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// other key
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else
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{
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if ((kbdFlags & KBD_SHIFT) != 0)
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kbdAscii = SCAN2ASCIISHIFT[kbdScan & 0x7F];
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else
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kbdAscii = SCAN2ASCII[kbdScan & 0x7F];
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}
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}
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//====do something with key::
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// printf("kbdScan == %d\nkbdAscii == %d\nkbdFlags == %d\n", kbdScan, kbdAscii, kbdFlags);
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if ((kbdScan == 83) && (kbdFlags & KBD_CTRL) && (kbdFlags & KBD_ALT))
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{
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printf("Initiating reboot.");
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restart();
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}
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if (kbdAscii == 2) //unknown key / ignore key
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{
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pic_eoi();
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return;
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}
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if (kbdScan < KBD_SCAN_RELEASED) //a key was pressed, save it
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{
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if (kbdBufferLen >= KBD_BUFFER_LENGTH) //no key slots available
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{
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pic_eoi();
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return;
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}
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else
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{
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kbdBuffer[(kbdBufferStart+kbdBufferLen++)%KBD_BUFFER_LENGTH] = (dword) ((kbdFlags << 16) | (kbdScan << 8) | kbdAscii);
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// printf("S:%d\tL:%d\tR:%x\n", kbdBufferStart, kbdBufferLen, kbdBuffer[kbdBufferStart]);
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}
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}
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pic_eoi();
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}
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//Gets a key from the buffer, returns 0 if no keys available, returns immediately
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dword kbdGetKey()
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{
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if (kbdBufferLen == 0) //buffer empty
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return 0;
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dword retVal = kbdBuffer[kbdBufferStart];
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kbdBufferStart++;
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kbdBufferLen--;
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if (kbdBufferStart >= KBD_BUFFER_LENGTH)
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kbdBufferStart = 0;
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return retVal;
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}
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//Gets a key from the buffer, if no keys available, waits for one to be entered
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dword kbdWaitKey()
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{
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for (;;)
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{
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if (kbdBufferLen != 0) //buffer empty
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break;
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}
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dword retVal = kbdBuffer[kbdBufferStart];
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kbdBufferStart++;
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kbdBufferLen--;
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if (kbdBufferStart >= KBD_BUFFER_LENGTH)
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kbdBufferStart = 0;
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return retVal;
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}
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//Resets the keyboard LEDs to reflect the current state of the num lock, caps lock, and scroll lock bits
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void kbd_resetLEDs()
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{
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outportb(0x60, 0xED);
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ackReason = 0xED;
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}
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