/*******************************************************************************************************************
 *File Name   : keyPort.h
 *Description : the file is cpu privatie key port
 *Date        : 2008/06/13
 *Author      : yuanguiyou
 --History:
 ------------------------------------------------------------------------------------------------------------------
 *change info:
 
 *******************************************************************************************************************/

#include "../includes.h"
#include "keyPort.h"

void  KeyInitPort(void)					/* Initialize I/O ports		*/
{
    KEY_PORT_CW = 0xF0;
    KEY_PORT_ROW = 0xFF;
}

uint8_t  KeyGetCol(void)					/* Read COLUMNs		*/
{
    return (~(inp(KEY_PORT_COL)&0x0F));
}



void  KeySelRow(uint8_t ucRow)			/* Select a ROW		*/
{
    if (ucRow == KEY_ALL_ROWS)
    {
        outp(KEY_PORT_ROW, 0x0F);			/* Force all rows LOW		*/
    }
    else
    {
        ucRow += 4;
        outp(KEY_PORT_ROW, ~(1 << ucRow));	/* Force desired row LOW	*/
    }
}