root / lab3 / kbc_func.c @ 47
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| 1 | 47 | up20180642 | #include "kbc_func.h" |
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| 2 | #include "kbc.h" |
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| 3 | |||
| 4 | #include <lcom/lcf.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_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 | int got_error = 0; |
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| 20 | |||
| 21 | void (kbc_ih)(void) { |
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| 22 | uint8_t status = 0;
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| 23 | got_error = 0;
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| 24 | |||
| 25 | if (util_sys_inb(STATUS_REG, &status)) {
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| 26 | got_error = 1;
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| 27 | return;
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| 28 | } |
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| 29 | |||
| 30 | if (status & (TIME_OUT_REC | PARITY_ERROR)) {
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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 | uint8_t byte = 0;
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| 36 | |||
| 37 | if (util_sys_inb(OUTPUT_BUF, &byte)) {
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| 38 | got_error = 1;
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| 39 | return;
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| 40 | } |
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| 41 | |||
| 42 | if (two_byte_scancode) {
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| 43 | scancode[1] = byte;
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| 44 | two_byte_scancode = 0;
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| 45 | } else {
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| 46 | scancode[0] = byte;
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| 47 | two_byte_scancode = (byte == TWO_BYTE_CODE); |
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| 48 | } |
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| 49 | |||
| 50 | } |
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| 51 | |||
| 52 | int (kbd_poll)(uint8_t bytes[], uint8_t *size){
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| 53 | if(bytes == NULL || size == NULL) return 1; |
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| 54 | uint8_t c; |
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| 55 | if(kbc_read_byte(&c)) return 1; |
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| 56 | if(c == TWO_BYTE_CODE){
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| 57 | if(kbc_read_byte(&bytes[1])) return 1; |
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| 58 | bytes[0] = c;
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| 59 | *size = 2;
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| 60 | }else{
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| 61 | bytes[1] = 0; |
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| 62 | bytes[0] = c;
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| 63 | *size = 1;
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| 64 | } |
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| 65 | return 0; |
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| 66 | } |
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| 67 | |||
| 68 | int (kbc_read_cmd)(uint8_t *cmd){
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| 69 | if(kbc_issue_cmd(READ_KBC_CMD)) return 1; |
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| 70 | if(kbc_read_byte(cmd)) return 1; |
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| 71 | return 0; |
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| 72 | } |
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| 73 | |||
| 74 | int (kbc_change_cmd)(uint8_t cmd){
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| 75 | if(kbc_issue_cmd(WRITE_KBC_CMD)) return 1; |
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| 76 | if(sys_outb(KBC_CMD_ARG, cmd)) return 1; |
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| 77 | return 0; |
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| 78 | } |
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| 79 | |||
| 80 | int (kbc_restore_kbd)(){
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| 81 | uint8_t cmd = 0;
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| 82 | if(kbc_read_cmd(&cmd)) return 1; |
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| 83 | cmd = (cmd | INT_KBD) & (~DIS_KBD); |
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| 84 | if(kbc_change_cmd(cmd)) return 1; |
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| 85 | return 0; |
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| 86 | } |
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| 87 | |||
| 88 | int (kbc_issue_cmd)(uint8_t cmd){
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| 89 | uint8_t stat; |
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| 90 | for(int i = 0; i < KBC_NUM_TRIES; ++i){ |
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| 91 | if(util_sys_inb(STATUS_REG, &stat)) return 1; |
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| 92 | if((stat&IN_BUF_FULL) == 0){ |
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| 93 | if(sys_outb(KBC_CMD, cmd)) return 1; |
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| 94 | return 0; |
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| 95 | } |
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| 96 | tickdelay(micros_to_ticks(DELAY)); |
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| 97 | } |
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| 98 | return 1; |
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| 99 | } |
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| 100 | |||
| 101 | int (kbc_read_byte)(uint8_t *byte){
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| 102 | uint8_t stat; |
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| 103 | while(true){ |
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| 104 | if(util_sys_inb(STATUS_REG, &stat)) return 1; |
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| 105 | if((stat&OUT_BUF_FUL) && (stat&AUX_MOUSE)==0){ |
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| 106 | if(stat & (PARITY_ERROR | TIME_OUT_REC)) return 1; |
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| 107 | if(util_sys_inb(OUTPUT_BUF, byte)) return 1; |
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| 108 | else return 0; |
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| 109 | } |
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| 110 | tickdelay(micros_to_ticks(DELAY)); |
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| 111 | } |
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| 112 | } |