lptport1.c

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/******************* 
*Project: 80X86 32BIT MULTI TASKING OPERATING SYSTEM
*Description: driver use this port as gpio.
*              this driver does not support printer.
*
*File: lptport1.c (I want lpt1.c,but xp doesn't allow.)
*Author: Book Chen
*Date: 2010.01.01
********************
*/
#include "includes.h"

#define Lpt1IdleState 0
#define Lpt1LedOnState 1
#define Lpt1LedOffState 2

LPT1_CONTROL Lpt1Ctrl;

void Lpt1Init(void){
    PicIrqDisable(IRQ7_LPT1);                   //no use interrupt at begining 
    Lpt1Ctrl.State=Lpt1LedOnState;
    Lpt1Ctrl.Data=0;
    Lpt1Ctrl.Status=0;
    Lpt1Ctrl.Control=LPT_CONTORL_DIR_READ|0xc0; //set data port read,
                                                //disable interrupt,
                                                //nSelectIn=1,nInit=1,nStrob=0,nAutoLF=0, 
    Lpt1Ctrl.Timer=0;
    Lpt1ControlPortWrite(Lpt1Ctrl.Control); //set data port read,disable interrupt,nStrob=0,nAutoLF=0 
    //InterruptIrqHandlerSet(IRQ7_LPT1,Lpt1Handler); //no use interrupt at begining 
    //PicIrqEnable(IRQ7_LPT1);                           //no use interrupt at begining 
}

void Lpt1Handler(void){
    // no operation function
}

void Lpt1Svc(void){
    switch(Lpt1Ctrl.State){
        case Lpt1IdleState: 
            break;
        case Lpt1LedOnState: 
            Lpt1DataPortWrite(0x00);
            Lpt1Ctrl.State=Lpt1LedOffState;
            break;
        case Lpt1LedOffState: 
            Lpt1DataPortWrite(0xff);
            Lpt1Ctrl.State=Lpt1LedOnState;
            break;
        default:
            break;
    }
}


U8 Lpt1DataPortRead(void){
    if((Lpt1Ctrl.Control&LPT_CONTORL_DIR_READ)==0){
        Lpt1DataPortSetInput();
    }
    Lpt1Ctrl.Data=InByte(LPT1_DATA_PORT);
    return Lpt1Ctrl.Data;
}

void Lpt1DataPortWrite(U8 Data){
    if((Lpt1Ctrl.Control&LPT_CONTORL_DIR_READ)==LPT_CONTORL_DIR_READ){
        Lpt1DataPortSetOutput();
    }
    Lpt1Ctrl.Data=Data;
    return OutByte(LPT1_DATA_PORT,Data);
}

void Lpt1DataPortSetOutput(void){
    Lpt1Ctrl.Control=Lpt1Ctrl.Control&(~LPT_CONTORL_DIR_READ); //dir bit=0 for output
    OutByte(LPT1_CONTROL_PORT,Lpt1Ctrl.Control);
}

void Lpt1DataPortSetInput(void){
    Lpt1Ctrl.Control=Lpt1Ctrl.Control|LPT_CONTORL_DIR_READ; //dir bit=0 for output
    OutByte(LPT1_CONTROL_PORT,Lpt1Ctrl.Control);
}

U8 Lpt1StatusPortRead(void){
    Lpt1Ctrl.Status=InByte(LPT1_STATUS_PORT);
}

void Lpt1ControlPortWrite(U8 Data){
    Lpt1Ctrl.Control=Data;
    OutByte(LPT1_CONTROL_PORT,Lpt1Ctrl.Control);
}

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