136 lines
4.4 KiB
C++
136 lines
4.4 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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#include "diskcontroller.h"
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DiskController::DiskController(ScreenImage& gui, int slot, bool lss13):
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gui(gui),
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slot(slot),
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drive1(diskBytes1,arm1),
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drive2(diskBytes2,arm2),
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currentDrive(&this->drive1),
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load(false),
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write(false),
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lssp6rom(lss13),
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seq(0x20), // gotta start somewhere
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t(0) {
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}
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DiskController::~DiskController() {
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}
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unsigned char DiskController::io(const unsigned short addr, const unsigned char d, const bool writing) {
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this->dataBusReadOnlyCopy = d;
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const unsigned char q = (addr & 0x000E) >> 1;
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const bool on = (addr & 0x0001);
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switch (q) {
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case 0:
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case 1: // TODO if phase-1 is on, it also acts as write-protect (UA2, 9-8)
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case 2:
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case 3:
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this->currentDrive->setMagnet(q,on);
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this->gui.setTrack(this->slot, getCurrentDriveNumber(), getTrack());
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break;
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case 4:
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this->motor.power(on);
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break;
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case 5:
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this->gui.clearCurrentDrive(this->slot, getCurrentDriveNumber());
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this->currentDrive = (on ? &this->drive2 : &this->drive1);
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this->gui.setCurrentDrive(this->slot, getCurrentDriveNumber(),getTrack(), this->motor.isOn());
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break;
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case 6:
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this->load = on;
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// TODO when to do these GUI updates?
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// this->gui.setDirty(this->slot,getCurrentDriveNumber(),true);
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break;
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case 7:
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this->write = on;
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break;
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}
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// if (this->dataRegister == 0xD5u) {
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// printf("\n");
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// }
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// if (this->dataRegister & 0x80u) {
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// printf("%02X ", this->dataRegister);
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// }
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return on ? d : this->dataRegister;
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}
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/*
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* Get a timing cycle here, based on the MPU clock (1 MHz).
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* In the real Apple we don't get really get this here. But...
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* We need a 2MHz clock for the LSS; and
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* we need to rotate the floppy @ 1 bit per 4 microseconds.
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* (When the motor is on, that is.)
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*/
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void DiskController::tick() {
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this->gui.setIO(this->slot, getCurrentDriveNumber(), this->motor.isOn());
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if (!this->motor.isOn()) {
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return;
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}
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this->motor.tick(); // only need to send tick when motor is powered on
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rotateCurrentDisk();
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// run two LSS cycles = 2MHz
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stepLss();
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this->currentDrive->clearPulse();
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stepLss();
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}
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void DiskController::rotateCurrentDisk() {
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++this->t;
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if (4 <= this->t) { // 4us interval between bits
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this->currentDrive->rotateDiskOneBit(); // (will also generate a read-pulse when it reads a 1-bit)
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this->t = 0;
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}
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}
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void DiskController::stepLss() {
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std::uint8_t adr = this->write<<3 | this->load<<2 | (this->dataRegister>>7)<<1 | this->currentDrive->readPulse();
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std::uint8_t cmd = this->lssp6rom.read(this->seq|adr);
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this->seq = cmd & 0xF0u;
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// LSS command functions (UA2, 9-15, Table 9.3)
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// printf("%02x:", cmd);
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if (cmd & 8u) {
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switch (cmd & 3u) {
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case 3:
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this->dataRegister = this->dataBusReadOnlyCopy;
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break;
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case 2:
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this->dataRegister >>= 1;
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this->dataRegister |= (isWriteProtected() << 7);
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// TODO how to handle writing?
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break;
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case 1:
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this->dataRegister <<= 1;
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this->dataRegister |= ((cmd & 4u) >> 2);
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// printf(this->dataRegister & 0x80u ? "\x1b[30;42m" : "\x1b[30;43m");
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// printf("%02X\x1b[0m ", this->dataRegister);
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// if (this->dataRegister & 0x80u) printf("\n");
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// TODO how to handle writing?
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break;
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}
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} else {
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this->dataRegister = 0;
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}
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}
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