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// keyboard.c
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// Author: Josh Holtrop
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// Created: 04/17/03
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// Modified: 03/02/04
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#include "hos_defines.h"
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#include "keyboard.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[128] = "\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[128] = "\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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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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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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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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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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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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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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@@ -0,0 +1,50 @@
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// keyboard.h
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// Author: Josh Holtrop
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// Created: 04/17/03
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// Modified: 03/02/04
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#include "hos_defines.h"
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#ifndef __HOS_KEYBOARD__
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#define __HOS_KEYBOARD__ __HOS_KEYBOARD__
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#define KBD_SCROLL 0x01
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#define KBD_NUM 0x02
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#define KBD_CAPS 0x04
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#define KBD_SHIFT 0x10
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#define KBD_CTRL 0x20
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#define KBD_ALT 0x40
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#define KBD_SCAN_RELEASED 128
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#define KBD_SCAN_LCTRL 29
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#define KBD_SCAN_LSHIFT 42
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#define KBD_SCAN_RSHIFT 54
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#define KBD_SCAN_LALT 56
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#define KBD_SCAN_SCROLL 70
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#define KBD_SCAN_CAPS 58
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#define KBD_SCAN_NUM 69
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#define KBD_SCANE_PRINTSCREEN 55
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#define KBD_SCANE_INS 82
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#define KBD_SCANE_HOME 71
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#define KBD_SCANE_PGUP 73
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#define KBD_SCANE_DEL 83
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#define KBD_SCANE_END 79
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#define KBD_SCANE_PGDN 81
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#define KBD_SCANE_ENTER 28
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#define KBD_SCANE_NULL 42
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//====PROTOTYPES:
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void isr_keyboard();
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void kbd_resetLEDs();
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dword kbdGetKey();
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dword kbdWaitKey();
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#endif
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@@ -0,0 +1,69 @@
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// 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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#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_mode.XResolution >> 1;
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mouse_y = video_mode.YResolution >> 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_mode.XResolution)
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mouse_x = video_mode.XResolution - 1;
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if (mouse_y < 0)
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mouse_y = 0;
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if (mouse_y >= video_mode.YResolution)
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mouse_y = video_mode.YResolution - 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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@@ -0,0 +1,15 @@
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// mouse.h
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// Author: Josh Holtrop
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// Date: 10/03/03
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// Modified: 03/02/04
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#ifndef __HOS_MOUSE__
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#define __HOS_MOUSE__ __HOS_MOUSE__
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void mouse_init();
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void isr_mouse();
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#endif
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