LCOM1920-T7G03.old1

#include "keyboard.h"

uint8_t scan_code=0;            // make code or break code

int keyboard_id = KEYBOARD_IRQ;         // KEYBOARD_IRQ is defined in interrupt.h in .minix-src folder

uint32_t cnt = 0;                                                                        // counter of sys_inb calls

int (util_sys_inb)(int port, uint8_t *value) { //transform 8 bit into 32 bit

  uint32_t new_val;                           //initializing 32 bit variable

  if(sys_inb(port,&new_val)!=0){              //verifies if there is an error

      printf("Error in util_sys_inb\n");

      return 1;

  }

  *value=new_val & 0xFF;                      //dereferencing "value"

  #ifdef LAB3

  cnt++;

  #endif

  return 0;

}

void (kbc_ih)(void){

  uint8_t status_reg;

  if(util_sys_inb(STATUS_REG,&status_reg)!=0){ //checks if there is an error

    return;

  }

  if(((status_reg & STAT_REG_OBF)==0) ||((status_reg&(STAT_REG_PAR|STAT_REG_TIMEOUT))!=0)){ //checks if there is a parity or timeout error (mask -> 0xC0, bit 7 and 6 set) and checks if output buffer is empty

    return;

  }

  util_sys_inb(OUTPUT_BUF,&scan_code);

}

int (kbc_subscribe_int)(uint8_t *bit_no) {    //similar function to that of timer_subscribe_int

    *bit_no = BIT(keyboard_id);

    if(sys_irqsetpolicy(KEYBOARD_IRQ,(IRQ_REENABLE|IRQ_EXCLUSIVE),&keyboard_id)==1){      //operation to subscribe int

        printf("Error subscribing int\n");

        return 1;

    }

  return 0;

}

int (kbc_unsubscribe_int)() {           //similar function to that of timer_unsubscribe_int

  if(sys_irqrmpolicy(&keyboard_id)==1){

      printf("Error unsubscribing int\n");

      return 1;

  }

  return 0;

}