root / lab3 / kbc.c @ 33
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| 1 | 30 | up20180655 | #include <lcom/lcf.h> |
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| 2 | |||
| 3 | #include "kbc.h" |
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| 4 | #include "kbc_func.h" |
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| 5 | |||
| 6 | int (subscribe_kbc_interrupt)(uint8_t interrupt_bit, int *interrupt_id) { |
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| 7 | if (interrupt_id == NULL) return 1; |
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| 8 | *interrupt_id = interrupt_bit; |
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| 9 | return (sys_irqsetpolicy(KBC_IRQ, IRQ_REENABLE | IRQ_EXCLUSIVE, interrupt_id));
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| 10 | } |
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| 11 | |||
| 12 | int (unsubscribe_kbc_interrupt)(int *interrupt_id) { |
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| 13 | if (interrupt_id == NULL) return 1; |
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| 14 | return sys_irqrmpolicy(interrupt_id);
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| 15 | } |
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| 16 | |||
| 17 | uint8_t scancode[2];
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| 18 | int two_byte_scancode = 0; |
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| 19 | 31 | up20180655 | int got_error = 0; |
| 20 | 30 | up20180655 | |
| 21 | void (kbc_ih)(void) { |
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| 22 | uint8_t status = 0;
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| 23 | 31 | up20180655 | got_error = 0;
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| 24 | 30 | up20180655 | |
| 25 | #ifdef LAB3
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| 26 | sys_inb_counter(INCREMENT); |
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| 27 | #endif
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| 28 | |||
| 29 | 31 | up20180655 | if (util_sys_inb(STATUS_REG, &status)) {
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| 30 | got_error = 1;
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| 31 | return;
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| 32 | } |
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| 33 | 30 | up20180655 | |
| 34 | 31 | up20180655 | if (status & (TIME_OUT_REC | PARITY_ERROR)) {
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| 35 | got_error = 1;
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| 36 | return;
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| 37 | } |
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| 38 | 30 | up20180655 | |
| 39 | #ifdef LAB3
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| 40 | sys_inb_counter(INCREMENT); |
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| 41 | #endif
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| 42 | |||
| 43 | uint8_t byte = 0;
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| 44 | |||
| 45 | 31 | up20180655 | if (util_sys_inb(OUTPUT_BUF, &byte)) {
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| 46 | got_error = 1;
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| 47 | return;
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| 48 | } |
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| 49 | 30 | up20180655 | |
| 50 | if (two_byte_scancode) {
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| 51 | scancode[1] = byte;
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| 52 | two_byte_scancode = 0;
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| 53 | } else {
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| 54 | scancode[0] = byte;
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| 55 | two_byte_scancode = (byte == TWO_BYTE_CODE); |
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| 56 | } |
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| 57 | |||
| 58 | } |
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| 59 | |||
| 60 | 31 | up20180655 | uint32_t (sys_inb_counter)(int increment) {
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| 61 | 30 | up20180655 | static uint32_t counter = 0; |
| 62 | if (increment) return ++counter; |
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| 63 | return counter;
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| 64 | } |