root / lab3 / kbc.c @ 41
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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 | } |
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| 65 | 36 | up20180642 | |
| 66 | int (kbd_poll)(uint8_t bytes[], uint8_t *size){
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| 67 | if(bytes == NULL || size == NULL) return 1; |
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| 68 | uint8_t c; |
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| 69 | 39 | up20180642 | if(kbc_read_byte(&c)) return 1; |
| 70 | 36 | up20180642 | if(c == TWO_BYTE_CODE){
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| 71 | 40 | up20180642 | if(kbc_read_byte(&bytes[1])) return 1; |
| 72 | bytes[0] = c;
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| 73 | 36 | up20180642 | *size = 2;
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| 74 | }else{
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| 75 | bytes[1] = 0; |
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| 76 | bytes[0] = c;
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| 77 | *size = 1;
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| 78 | } |
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| 79 | return 0; |
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| 80 | } |
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| 81 | |||
| 82 | 39 | up20180642 | int (kbc_read_cmd)(uint8_t *cmd){
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| 83 | if(kbc_issue_cmd(READ_KBC_CMD)) return 1; |
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| 84 | if(kbc_read_byte(cmd)) return 1; |
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| 85 | return 0; |
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| 86 | } |
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| 87 | |||
| 88 | int (kbc_change_cmd)(uint8_t cmd){
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| 89 | if(kbc_issue_cmd(WRITE_KBC_CMD)) return 1; |
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| 90 | if(sys_outb(KBC_CMD_ARG, cmd)) return 1; |
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| 91 | return 0; |
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| 92 | } |
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| 93 | |||
| 94 | int (kbc_issue_cmd)(uint8_t cmd){
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| 95 | 36 | up20180642 | uint8_t stat; |
| 96 | 40 | up20180642 | for(int i = 0; i < KBC_NUM_TRIES; ++i){ |
| 97 | 36 | up20180642 | if(util_sys_inb(STATUS_REG, &stat)) return 1; |
| 98 | 38 | up20180642 | if((stat&IN_BUF_FULL) == 0){ |
| 99 | if(sys_outb(KBC_CMD, cmd)) return 1; |
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| 100 | return 0; |
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| 101 | } |
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| 102 | tickdelay(micros_to_ticks(DELAY)); |
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| 103 | } |
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| 104 | return 1; |
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| 105 | } |
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| 106 | |||
| 107 | 39 | up20180642 | int (kbc_read_byte)(uint8_t *byte){
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| 108 | 38 | up20180642 | uint8_t stat; |
| 109 | while(true){ |
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| 110 | if(util_sys_inb(STATUS_REG, &stat)) return 1; |
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| 111 | if((stat&OUT_BUF_FUL) && (stat&AUX_MOUSE)==0){ |
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| 112 | 36 | up20180642 | if(stat & (PARITY_ERROR | TIME_OUT_REC)) return 1; |
| 113 | 38 | up20180642 | if(util_sys_inb(OUTPUT_BUF, byte)) return 1; |
| 114 | else return 0; |
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| 115 | 36 | up20180642 | } |
| 116 | tickdelay(micros_to_ticks(DELAY)); |
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| 117 | } |
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| 118 | } |