root / lab4 / kbc.c @ 64
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| 1 | 59 | up20180642 | #include <lcom/lcf.h> |
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| 2 | |||
| 3 | #include "kbc.h" |
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| 4 | |||
| 5 | #include "kbc_macros.h" |
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| 6 | |||
| 7 | int (unsubscribe_interrupt)(int *interrupt_id) { |
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| 8 | if (interrupt_id == NULL) return 1; |
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| 9 | return sys_irqrmpolicy(interrupt_id);
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| 10 | } |
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| 11 | |||
| 12 | int (kbc_read_cmd)(uint8_t *cmd){
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| 13 | if(kbc_issue_cmd(READ_KBC_CMD)) return 1; |
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| 14 | if(kbc_read_byte(cmd)) return 1; |
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| 15 | return 0; |
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| 16 | } |
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| 17 | |||
| 18 | int (kbc_change_cmd)(uint8_t cmd){
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| 19 | if(kbc_issue_cmd(WRITE_KBC_CMD)) return 1; |
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| 20 | if(sys_outb(KBC_CMD_ARG, cmd)) return 1; |
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| 21 | return 0; |
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| 22 | } |
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| 23 | |||
| 24 | int (kbc_restore_kbd)(){
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| 25 | uint8_t cmd = 0;
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| 26 | if(kbc_read_cmd(&cmd)) return 1; |
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| 27 | cmd = (cmd | INT_KBD) & (~DIS_KBD) ; |
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| 28 | if(kbc_change_cmd(cmd)) return 1; |
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| 29 | return 0; |
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| 30 | } |
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| 31 | |||
| 32 | int (kbc_issue_cmd)(uint8_t cmd){
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| 33 | uint8_t stat; |
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| 34 | for(int i = 0; i < KBC_NUM_TRIES; ++i){ |
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| 35 | if(util_sys_inb(STATUS_REG, &stat)) return 1; |
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| 36 | if((stat&IN_BUF_FULL) == 0){ |
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| 37 | if(sys_outb(KBC_CMD, cmd)) return 1; |
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| 38 | return 0; |
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| 39 | } |
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| 40 | tickdelay(micros_to_ticks(DELAY)); |
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| 41 | } |
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| 42 | return 1; |
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| 43 | } |
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| 44 | |||
| 45 | int (kbc_read_byte)(uint8_t *byte){
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| 46 | uint8_t stat; |
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| 47 | while(true){ |
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| 48 | if(util_sys_inb(STATUS_REG, &stat)) return 1; |
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| 49 | if((stat&OUT_BUF_FUL) && (stat&AUX_MOUSE)==0){ |
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| 50 | if(stat & (PARITY_ERROR | TIME_OUT_REC)) return 1; |
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| 51 | if(util_sys_inb(OUTPUT_BUF, byte)) return 1; |
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| 52 | else return 0; |
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| 53 | } |
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| 54 | tickdelay(micros_to_ticks(DELAY)); |
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| 55 | } |
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| 56 | } |