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/***************************************************************************
* Copyright (C) 2013 by Blade_Arma <edgbla@yandex.ru> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "typedefs.h"
#include "psemu_plugin_defs.h"
#include "sio1.h"
#include "fifo.h"
#include "connection.h"
/***************************************************************************/
static u8 _buf[8];
static s32 _indexw;
static s32 _indexr;
static s32 _employment;
static s32 _overrun;
/***************************************************************************/
void fifoOpen() {
fifoReset();
fifoResetErr();
}
void fifoClose() {
}
/***************************************************************************/
void fifoReset() {
_indexw = 0;
_indexr = 0;
_employment = 0;
}
void fifoResetErr() {
_overrun = 0;
}
/***************************************************************************/
s32 fifoEmployment() {
return _employment;
}
s32 fifoEmpty() {
return (_employment == 0);
}
s32 fifoFull() {
return (_employment == 8);
}
s32 fifoOverrun() {
return _overrun;
}
/***************************************************************************/
void fifoPush(u8 data) {
if(_employment > 8) {
_overrun = 1;
--_indexw;
if(_indexw < 0)
_indexw += 8;
--_employment;
}
_buf[_indexw] = data;
++_indexw;
if(_indexw >= 8)
_indexw -= 8;
++_employment;
}
void fifoPeek(u8 *data) {
if(_employment <= 0)
*data = 0;
else
*data = _buf[_indexr];
}
void fifoPop(u8 *data) {
if(_employment <= 0) {
*data = 0;
}
else {
*data = _buf[_indexr];
++_indexr;
if(_indexr >= 8)
_indexr -= 8;
--_employment;
}
}
/***************************************************************************/
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