mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-26 08:49:37 +00:00
46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
//
|
|
// DiskIIDrive.cpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 20/11/2020.
|
|
// Copyright © 2020 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#include "DiskIIDrive.hpp"
|
|
|
|
using namespace Apple::Disk;
|
|
|
|
DiskIIDrive::DiskIIDrive(int input_clock_rate) :
|
|
IWMDrive(input_clock_rate, 1) {
|
|
Drive::set_rotation_speed(300.0f);
|
|
}
|
|
|
|
void DiskIIDrive::set_enabled(bool enabled) {
|
|
set_motor_on(enabled);
|
|
}
|
|
|
|
void DiskIIDrive::set_control_lines(int lines) {
|
|
// If the stepper magnet selections have changed, and any is on, see how
|
|
// that moves the head.
|
|
if(lines ^ stepper_mask_ && lines) {
|
|
// Convert from a representation of bits set to the centre of pull.
|
|
int direction = 0;
|
|
if(lines&1) direction += (((stepper_position_ - 0) + 4)&7) - 4;
|
|
if(lines&2) direction += (((stepper_position_ - 2) + 4)&7) - 4;
|
|
if(lines&4) direction += (((stepper_position_ - 4) + 4)&7) - 4;
|
|
if(lines&8) direction += (((stepper_position_ - 6) + 4)&7) - 4;
|
|
const int bits_set = (lines&1) + ((lines >> 1)&1) + ((lines >> 2)&1) + ((lines >> 3)&1);
|
|
direction /= bits_set;
|
|
|
|
// Compare to the stepper position to decide whether that pulls in the
|
|
// current cog notch, or grabs a later one.
|
|
step(Storage::Disk::HeadPosition(-direction, 4));
|
|
stepper_position_ = (stepper_position_ - direction + 8) & 7;
|
|
}
|
|
stepper_mask_ = lines;
|
|
}
|
|
|
|
bool DiskIIDrive::read() {
|
|
return !!(stepper_mask_ & 2) || get_is_read_only();
|
|
}
|