mirror of
https://github.com/cmosher01/Epple-II.git
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124 lines
3.0 KiB
C++
124 lines
3.0 KiB
C++
/*
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epple2
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Copyright (C) 2008 by Christopher A. Mosher <cmosher01@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY, without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef DRIVE_H
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#define DRIVE_H
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#include <random>
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#include <chrono>
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#include <string>
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#include <cstdint>
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#include <iostream>
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#include "wozfile.h"
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#include "steppermotor.h"
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class Drive {
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private:
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WozFile& disk;
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StepperMotor& arm;
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bool pulse;
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std::uint8_t cContiguousZeroBits;
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std::default_random_engine generator;
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std::uniform_int_distribution<int> distribution;
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bool randomBit() {
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return !distribution(generator);
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}
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public:
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Drive(WozFile& disk, StepperMotor& arm):
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disk(disk),
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arm(arm),
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pulse(false),
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cContiguousZeroBits(0),
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generator(std::chrono::system_clock::now().time_since_epoch().count()),
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distribution(0,1) {
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}
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~Drive() {
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}
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bool loadDisk(const std::string& fnib) {
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return this->disk.load(fnib);
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}
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void unloadDisk() {
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this->disk.unload();
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}
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bool isLoaded() const {
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return this->disk.isLoaded();
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}
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void saveDisk() {
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this->disk.save();
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}
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bool isWriteProtected() const {
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return this->disk.isWriteProtected();
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}
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bool isModified() const {
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return this->disk.isModified();
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}
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void setMagnet(unsigned char q, bool on) {
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this->arm.setMagnet(q,on);
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}
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int getTrack() const {
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return this->arm.getTrack();
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}
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void rotateDiskOneBit() {
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this->disk.rotateOneBit(this->arm.getQuarterTrack());
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if (this->disk.getBit(this->arm.getQuarterTrack())) {
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this->pulse = true;
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cContiguousZeroBits = 0;
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} else {
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// keep a count of contiguous zero-bits and generate random bits when
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// we see more than three (emulating the MC3470, see UA2, 9-11)
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++cContiguousZeroBits;
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if (3 < cContiguousZeroBits) {
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if (randomBit()) {
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this->pulse = true;
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}
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}
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}
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}
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bool readPulse() const {
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return this->pulse;
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}
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void clearPulse() {
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this->pulse = false;
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}
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void writeBit(bool on) {
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this->disk.setBit(this->arm.getQuarterTrack(), on);
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}
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};
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#endif
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