root / lab3 / kbc.c @ 43
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#include <lcom/lcf.h> |
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#include "kbc.h" |
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#include "kbc_func.h" |
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int (subscribe_kbc_interrupt)(uint8_t interrupt_bit, int *interrupt_id) { |
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if (interrupt_id == NULL) return 1; |
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*interrupt_id = interrupt_bit; |
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return (sys_irqsetpolicy(KBC_IRQ, IRQ_REENABLE | IRQ_EXCLUSIVE, interrupt_id));
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} |
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int (unsubscribe_kbc_interrupt)(int *interrupt_id) { |
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if (interrupt_id == NULL) return 1; |
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return sys_irqrmpolicy(interrupt_id);
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} |
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uint8_t scancode[2];
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int two_byte_scancode = 0; |
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int got_error = 0; |
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void (kbc_ih)(void) { |
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uint8_t status = 0;
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got_error = 0;
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if (util_sys_inb(STATUS_REG, &status)) {
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got_error = 1;
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return;
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} |
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if (status & (TIME_OUT_REC | PARITY_ERROR)) {
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got_error = 1;
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return;
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} |
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uint8_t byte = 0;
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if (util_sys_inb(OUTPUT_BUF, &byte)) {
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got_error = 1;
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return;
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} |
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if (two_byte_scancode) {
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scancode[1] = byte;
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two_byte_scancode = 0;
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} else {
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scancode[0] = byte;
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two_byte_scancode = (byte == TWO_BYTE_CODE); |
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} |
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} |
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int (kbd_poll)(uint8_t bytes[], uint8_t *size){
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if(bytes == NULL || size == NULL) return 1; |
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uint8_t c; |
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if(kbc_read_byte(&c)) return 1; |
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if(c == TWO_BYTE_CODE){
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if(kbc_read_byte(&bytes[1])) return 1; |
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bytes[0] = c;
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*size = 2;
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}else{
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bytes[1] = 0; |
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bytes[0] = c;
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*size = 1;
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} |
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return 0; |
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} |
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int (kbc_read_cmd)(uint8_t *cmd){
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if(kbc_issue_cmd(READ_KBC_CMD)) return 1; |
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if(kbc_read_byte(cmd)) return 1; |
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return 0; |
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} |
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int (kbc_change_cmd)(uint8_t cmd){
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if(kbc_issue_cmd(WRITE_KBC_CMD)) return 1; |
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if(sys_outb(KBC_CMD_ARG, cmd)) return 1; |
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return 0; |
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} |
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int (kbc_restore_kbd)(){
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uint8_t cmd = 0;
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if(kbc_read_cmd(&cmd)) return 1; |
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cmd = (cmd | INT_KBD) & (~DIS_KBD); |
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if(kbc_change_cmd(cmd)) return 1; |
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return 0; |
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} |
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int (kbc_issue_cmd)(uint8_t cmd){
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uint8_t stat; |
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for(int i = 0; i < KBC_NUM_TRIES; ++i){ |
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if(util_sys_inb(STATUS_REG, &stat)) return 1; |
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if((stat&IN_BUF_FULL) == 0){ |
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if(sys_outb(KBC_CMD, cmd)) return 1; |
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return 0; |
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} |
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tickdelay(micros_to_ticks(DELAY)); |
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} |
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return 1; |
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} |
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int (kbc_read_byte)(uint8_t *byte){
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uint8_t stat; |
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while(true){ |
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if(util_sys_inb(STATUS_REG, &stat)) return 1; |
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if((stat&OUT_BUF_FUL) && (stat&AUX_MOUSE)==0){ |
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if(stat & (PARITY_ERROR | TIME_OUT_REC)) return 1; |
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if(util_sys_inb(OUTPUT_BUF, byte)) return 1; |
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else return 0; |
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} |
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tickdelay(micros_to_ticks(DELAY)); |
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} |
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} |