root / lab4 / kbd.c @ 62
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| 1 | 59 | up20180642 | #include <lcom/lcf.h> |
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| 2 | |||
| 3 | #include "kbd.h" |
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| 4 | |||
| 5 | #include "kbc_macros.h" |
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| 6 | #include "kbc.h" |
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| 7 | |||
| 8 | int (subscribe_kbc_interrupt)(uint8_t interrupt_bit, int *interrupt_id) { |
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| 9 | if (interrupt_id == NULL) return 1; |
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| 10 | *interrupt_id = interrupt_bit; |
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| 11 | return (sys_irqsetpolicy(KBC_IRQ, IRQ_REENABLE | IRQ_EXCLUSIVE, interrupt_id));
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| 12 | } |
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| 13 | |||
| 14 | void (kbc_ih)(void) { |
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| 15 | uint8_t status = 0;
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| 16 | got_error = 0;
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| 17 | |||
| 18 | if (util_sys_inb(STATUS_REG, &status)) {
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| 19 | got_error = 1;
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| 20 | return;
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| 21 | } |
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| 22 | |||
| 23 | if (status & (TIME_OUT_REC | PARITY_ERROR)) {
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| 24 | got_error = 1;
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| 25 | return;
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| 26 | } |
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| 27 | |||
| 28 | uint8_t byte = 0;
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| 29 | |||
| 30 | if (util_sys_inb(OUTPUT_BUF, &byte)) {
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| 31 | got_error = 1;
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| 32 | return;
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| 33 | } |
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| 34 | |||
| 35 | if (two_byte_scancode) {
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| 36 | scancode[1] = byte;
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| 37 | two_byte_scancode = 0;
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| 38 | } else {
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| 39 | scancode[0] = byte;
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| 40 | two_byte_scancode = (byte == TWO_BYTE_CODE); |
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| 41 | } |
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| 42 | |||
| 43 | } |
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| 44 | |||
| 45 | int (kbd_poll)(uint8_t bytes[], uint8_t *size){
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| 46 | if(bytes == NULL || size == NULL) return 1; |
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| 47 | uint8_t c; |
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| 48 | if(kbc_read_byte(&c)) return 1; |
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| 49 | if(c == TWO_BYTE_CODE){
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| 50 | if(kbc_read_byte(&bytes[1])) return 1; |
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| 51 | bytes[0] = c;
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| 52 | *size = 2;
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| 53 | }else{
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| 54 | bytes[1] = 0; |
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| 55 | bytes[0] = c;
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| 56 | *size = 1;
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| 57 | } |
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| 58 | return 0; |
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| 59 | } |