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https://github.com/Tom-on64/kern.git
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99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
#ifndef KEYBOARD_H
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#define KEYBOARD_H
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#include "irq.h"
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#include "idt.h"
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#include "system.h"
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#include "screen.h"
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#include "stdint.h"
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#include "stdbool.h"
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// Keycodes
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#define LEFT_SHIFT_PRESS 0x2a
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#define LEFT_SHIFT_RELEASE (LEFT_SHIFT_PRESS | 0x80)
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#define RIGHT_SHIFT_PRESS 0x36
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#define RIGHT_SHIFT_RELEASE (RIGHT_SHIFT_PRESS | 0x80)
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#define LEFT_CTRL_PRESS 0x1D
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#define LEFT_CTRL_RELEASE (LEFT_CTRL_PRESS | 0x80)
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#define RIGHT_CTRL_PRESS 0x1D
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#define RIGHT_CTRL_RELEASE (RIGHT_CTRL_PRESS | 0x80)
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#define LEFT_ALT_PRESS 0x38
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#define LEFT_ALT_RELEASE (LEFT_ALT_PRESS | 0x80)
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#define RIGHT_ALT_PRESS 0x38
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#define RIGHT_ALT_RELEASE (RIGHT_ALT_PRESS | 0x80)
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#define MAX_BUFFER_SIZE 256
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const char US_Keyboard[2][128] = {
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{
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0, 27, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', '\b',
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'\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',
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0, 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`',
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0, '\\', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', 0,
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'*', 0, ' ', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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'7', '8', '9', '-', '4', '5', '6', '+', '1', '2', '3', '0', '.', // Numpad
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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},
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{
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0, 27, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', '\b', '\t',
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'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n', 0, 'A', 'S',
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'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~', 0, '|', 'Z', 'X', 'C', 'V',
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'B', 'N', 'M', '<', '>', '?', 0, '*', 0, ' ', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, '7', '8', '9', '-', '4', '5', '6', '+', '1', '2', '3', '0', '.',
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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}
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};
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uint8_t shift = 0;
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uint16_t bufferLen = 0;
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char buffer[MAX_BUFFER_SIZE + 1] = { 0 };
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bool echo = false;
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bool canBackspace = false;
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// TODO: Refactor this
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void keyboardHandler() {
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uint8_t scancode;
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scancode = inb(0x60);
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if (scancode == LEFT_SHIFT_PRESS || scancode == RIGHT_SHIFT_PRESS) shift = 1;
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else if (scancode == LEFT_SHIFT_RELEASE || scancode == RIGHT_SHIFT_RELEASE) shift = 0;
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char c = US_Keyboard[shift][scancode];
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if (scancode & 0x80) { // Keyup
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} else if (c != 0) {
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if (!canBackspace && c == '\b') return;
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if (echo) putc(c);
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buffer[bufferLen] = c;
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if (c == '\b') bufferLen--;
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else bufferLen++;
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if (bufferLen > 0) canBackspace = true;
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else canBackspace = false;
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}
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}
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// TODO: Add a 'char readc();' function that returns a single read character and use it for read()
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// Also this should be refactored to not use so many flag variables
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char* read(char terminator) {
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bufferLen = 0;
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echo = true;
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while (buffer[bufferLen-1] != terminator && bufferLen < MAX_BUFFER_SIZE);
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echo = false;
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canBackspace = false;
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buffer[bufferLen] = '\0';
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return buffer;
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}
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void setupKeyboard() {
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installIrqHandler(1, keyboardHandler);
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}
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#endif
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