262 lines
6.8 KiB
C
262 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: 08/16/04
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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 "kout.h"
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#define KBD_BUFFER_LENGTH 64
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u8_t kbdFlags = 0; // holds current keyboard flags - caps/num/scroll/shift/ctrl/alt
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char lastWasE0 = 0; // was the last byte 0x0E ?
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u32_t 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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u8_t rawIgnore = 0; // how many signals to blatantly ignore
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u8_t 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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const u8_t SCAN2ASCII[129] =
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"\000\0331234567890-=\010\011" // null,esc,1234567890-=,bksp,tab
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"qwertyuiop[]\n\000as" // qwertyuiop[],enter,lctrl,as
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"dfghjkl;'`\000\\zxcv" // dfghjkl;'`,lshift,\zxcv
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"bnm,./\000*\000 \000\000\000\000\000\000" // bnm,./,rshift,*,alt,space,caps,f1,f2,f3,f4,f5
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"\000\000\000\000\000\000\000\000\000\000-\000\000\000+\000" // f6,f7,f8,f9,f10,num,scrl,home,up,pgup,dash,left,center,right,plus,end
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"\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" // down,pgdn,ins,del,?,?,?,f11,f12,?,?,winL,winR,menu,?,?
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"\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" // ?
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"\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"; // ?
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const u8_t SCAN2ASCII2[129] =
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"\000\033!@#$%^&*()_+\010\011"
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"QWERTYUIOP{}\n\000AS"
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"DFGHJKL:\"~\000|ZXCV"
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"BNM<>?\000*\000 \000\000\000\000\000\000"
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"\000\000\000\000\000\000\000789-456+1"
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"230.\000\000\000\000\000\000\000\000\000\000\000\000"
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"\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
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"\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000";
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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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kprintf("KEYBOARD INTERRUPT: 0x%x\n", kbdScan);
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u8_t inState = inportb(0x61);
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outportb(0x61, inState|0x80);
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outportb(0x61, inState);
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return;
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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) // 0xE0 == 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) // 0xE1 == 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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kprintf("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] = (u32_t) ((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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u32_t kbdGetKey()
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{
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if (kbdBufferLen == 0) //buffer empty
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return 0;
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u32_t 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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u32_t 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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u32_t 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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