84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
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#include <rockos/keyboard.h>
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#include <rockos/pic.h>
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#include <rockos/timer.h>
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#include <rockos/hal.h>
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#include <string.h>
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#define ESC_P 0x01
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#define BACKSPACE_P 0x0F
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#define ENTER_P 0x1C
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#define LEFT_C_P 0x1D
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#define LEFT_SHIFT_P 0x2B
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#define RIGHT_SHIFT_P 0x36
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#define LEFT_ALT_P 0x38
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#define CAPS_LCK_P 0x3A
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static unsigned char interrupt_key;
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static uint8_t keyset[89];
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static uint64_t keytimes[89];
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static unsigned char keymap[89] = {
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0, ESC_P, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', BACKSPACE_P,
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'\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', ENTER_P, LEFT_C_P,
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'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`', LEFT_SHIFT_P, '\\',
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'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', RIGHT_SHIFT_P, '*', LEFT_ALT_P, ' ', CAPS_LCK_P
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};
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void initialize_keyset() {
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memset(keyset, 0, 89);
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memset(keytimes, 0, 89);
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}
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__attribute__((interrupt)) void keyboard_handler(void* frame) {
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interrupt_key = inb(0x60);
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pic_eoi(1);
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if((interrupt_key & 128) == 128){
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keyset[interrupt_key - 0x80] = 0;
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keytimes[interrupt_key - 0x80] = 0;
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} else {
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if(keyset[interrupt_key] == 2)
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return;
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keyset[interrupt_key] = 1;
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}
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}
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unsigned char readkey() {
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uint8_t shift_pressed = 0;
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if (keyset[LEFT_SHIFT_P] || keyset[RIGHT_SHIFT_P])
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shift_pressed = 1;
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for(uint8_t i = 0; i < 89; ++i) {
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switch(i) {
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case ESC_P:
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case LEFT_C_P:
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case LEFT_SHIFT_P:
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case RIGHT_SHIFT_P:
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case LEFT_ALT_P:
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case CAPS_LCK_P:
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continue;
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}
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if (keyset[i]){
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uint64_t temptime = get_ticks();
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if(keytimes[i]) {
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if(keyset[i] == 1) {
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if(temptime - keytimes[i] < 20) {
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return 0;
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} else {
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keyset[i] = 2;
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}
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} else {
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if(temptime - keytimes[i] < 5) {
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return 0;
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}
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}
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}
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keytimes[i] = temptime;
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if (shift_pressed && (keymap[i] > 0x60 && keymap[i] < 0x7A)) {
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return keymap[i] - 0x20;
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} else {
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return keymap[i];
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}
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}
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}
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return 0;
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}
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