86 lines
No EOL
2 KiB
C
86 lines
No EOL
2 KiB
C
#ifndef DRIVERS_KEYBOARD_C
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#define DRIVERS_KEYBOARD_C
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#include <stdbool.h>
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#include <stddef.h>
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#include "keycodes.c"
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#include "../../util/fifo.c"
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#include "keymaps/DUMMY_azerty.c"
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#define KEY_QUEUE_EMPTY FIFO_QUEUE_EMPTY
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bool keyboard_shift_state;
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bool keyboard_caps_state;
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fifo* key_queue = NULL;
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int scancode_to_char(unsigned char scancode) {
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keycode keycode = get_keycode(scancode);
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if (keycode == KEYCODE_UNKNOWN) {
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return -1;
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} else if (keycode == KEYCODE_SHIFT_DOWN) {
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keyboard_shift_state = true;
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return -1;
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} else if (keycode == KEYCODE_SHIFT_UP) {
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keyboard_shift_state = false;
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return -1;
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} else if (keycode == KEYCODE_CAPS_UP) {
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keyboard_caps_state = !keyboard_caps_state;
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return -1;
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} else if (keycode == KEYCODE_CAPS_DOWN) {
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return -1;
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} else if (keycode >= KEYCODE_A && keycode <= KEYCODE_Z) {
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if (keyboard_shift_state ^ keyboard_caps_state) {
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return (char) keycode; // Upper case
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} else {
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return ((char) keycode) + 32; // Lower case
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}
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} else {
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return (char) keycode;
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}
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}
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void handle_scancode(unsigned char scancode) {
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int keycode = scancode_to_char(scancode);
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if (keycode == -1) {
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return;
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} else {
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fifo_enqueue(key_queue, (char) keycode);
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}
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}
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__attribute__((interrupt)) void keyboard_handler(struct interrupt_frame* frame) {
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unsigned char scan_code = inb(0x60);
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outb(0x20, 0x20);
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handle_scancode(scan_code);
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}
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int getchar_nonblocking() {
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return fifo_dequeue(key_queue);
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}
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char getchar() {
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int curr = KEY_QUEUE_EMPTY;
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while ((curr = getchar_nonblocking()) == KEY_QUEUE_EMPTY) {
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asm("hlt"); // And don't catch fire
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}
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return (char) curr;
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}
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void keyboard_init() {
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keyboard_shift_state = false;
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keyboard_caps_state = false;
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key_queue = fifo_new();
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uint8_t mask = inb(0x21);
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mask = mask & ~(1 << 1);
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outb(0x21 , mask);
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}
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#endif //DRIVERS_KEYBOARD_C
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