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841 lines
23 KiB
C++
841 lines
23 KiB
C++
//
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// 1770.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 17/09/2016.
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// Copyright 2016 Thomas Harte. All rights reserved.
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//
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#include "1770.hpp"
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#include "../../Storage/Disk/Encodings/MFM/Constants.hpp"
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#define LOG_PREFIX "[WD FDC] "
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#include "../../Outputs/Log.hpp"
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using namespace WD;
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WD1770::WD1770(Personality p) :
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Storage::Disk::MFMController(8000000),
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personality_(p),
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interesting_event_mask_(int(Event1770::Command)) {
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set_is_double_density(false);
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posit_event(int(Event1770::Command));
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}
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void WD1770::write(int address, uint8_t value) {
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switch(address&3) {
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case 0: {
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if((value&0xf0) == 0xd0) {
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if(value == 0xd0) {
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// Force interrupt **immediately**.
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LOG("Force interrupt immediately");
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posit_event(int(Event1770::ForceInterrupt));
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} else {
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ERROR("!!!TODO: force interrupt!!!");
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update_status([] (Status &status) {
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status.type = Status::One;
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});
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}
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} else {
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command_ = value;
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posit_event(int(Event1770::Command));
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}
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}
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break;
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case 1: track_ = value; break;
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case 2: sector_ = value; break;
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case 3:
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data_ = value;
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update_status([] (Status &status) {
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status.data_request = false;
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});
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break;
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}
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}
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uint8_t WD1770::read(int address) {
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switch(address&3) {
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default: {
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update_status([] (Status &status) {
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status.interrupt_request = false;
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});
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uint8_t status =
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(status_.crc_error ? Flag::CRCError : 0) |
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(status_.busy ? Flag::Busy : 0);
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// Per Jean Louis-Guérin's documentation:
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//
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// * the write-protect bit is locked into place by a type 2 or type 3 command, but is
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// read live after a type 1.
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// * the track 0 bit is captured during a type 1 instruction and lost upon any other type,
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// it is not live sampled.
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switch(status_.type) {
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case Status::One:
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status |=
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(status_.track_zero ? Flag::TrackZero : 0) |
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(status_.seek_error ? Flag::SeekError : 0) |
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(get_drive().get_is_read_only() ? Flag::WriteProtect : 0) |
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(get_drive().get_index_pulse() ? Flag::Index : 0);
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break;
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case Status::Two:
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case Status::Three:
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status |=
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(status_.write_protect ? Flag::WriteProtect : 0) |
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(status_.record_type ? Flag::RecordType : 0) |
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(status_.lost_data ? Flag::LostData : 0) |
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(status_.data_request ? Flag::DataRequest : 0) |
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(status_.record_not_found ? Flag::RecordNotFound : 0);
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break;
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}
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if(!has_motor_on_line()) {
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status |= get_drive().get_is_ready() ? 0 : Flag::NotReady;
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if(status_.type == Status::One)
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status |= (head_is_loaded_ ? Flag::HeadLoaded : 0);
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} else {
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status |= (get_drive().get_motor_on() ? Flag::MotorOn : 0);
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if(status_.type == Status::One)
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status |= (status_.spin_up ? Flag::SpinUp : 0);
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}
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// LOG("Returned status " << PADHEX(2) << int(status) << " of type " << 1+int(status_.type));
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return status;
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}
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case 1:
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LOG("Returned track " << int(track_));
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return track_;
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case 2:
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LOG("Returned sector " << int(sector_));
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return sector_;
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case 3:
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update_status([] (Status &status) {
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status.data_request = false;
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});
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return data_;
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}
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}
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void WD1770::run_for(const Cycles cycles) {
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Storage::Disk::Controller::run_for(cycles);
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if(delay_time_) {
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const auto number_of_cycles = cycles.as_integral();
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if(delay_time_ <= number_of_cycles) {
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delay_time_ = 0;
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posit_event(int(Event1770::Timer));
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} else {
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delay_time_ -= number_of_cycles;
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}
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}
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}
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#define WAIT_FOR_EVENT(mask) resume_point_ = __LINE__; interesting_event_mask_ = int(mask); return; case __LINE__:
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#define WAIT_FOR_TIME(ms) resume_point_ = __LINE__; delay_time_ = ms * 8000; WAIT_FOR_EVENT(Event1770::Timer);
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#define WAIT_FOR_BYTES(count) resume_point_ = __LINE__; distance_into_section_ = 0; WAIT_FOR_EVENT(Event::Token); if(get_latest_token().type == Token::Byte) distance_into_section_++; if(distance_into_section_ < count) { interesting_event_mask_ = int(Event::Token); return; }
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#define BEGIN_SECTION() switch(resume_point_) { default:
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#define END_SECTION() (void)0; }
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#define READ_ID() \
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if(new_event_type == int(Event::Token)) { \
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if(!distance_into_section_ && get_latest_token().type == Token::ID) {\
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set_data_mode(DataMode::Reading); \
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++distance_into_section_; \
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} else if(distance_into_section_ && distance_into_section_ < 7 && get_latest_token().type == Token::Byte) { \
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header_[distance_into_section_ - 1] = get_latest_token().byte_value; \
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++distance_into_section_; \
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} \
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}
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#define CONCATENATE(x, y) x ## y
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#define INDIRECT_CONCATENATE(x, y) TOKENPASTE(x, y)
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#define LINE_LABEL INDIRECT_CONCATENATE(label, __LINE__)
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#define SPIN_UP() \
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set_motor_on(true); \
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index_hole_count_ = 0; \
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index_hole_count_target_ = 6; \
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WAIT_FOR_EVENT(Event1770::IndexHoleTarget); \
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status_.spin_up = true;
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// +--------+----------+-------------------------+
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// ! ! ! BITS !
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// ! TYPE ! COMMAND ! 7 6 5 4 3 2 1 0 !
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// +--------+----------+-------------------------+
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// ! 1 ! Restore ! 0 0 0 0 h v r1 r0 !
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// ! 1 ! Seek ! 0 0 0 1 h v r1 r0 !
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// ! 1 ! Step ! 0 0 1 u h v r1 r0 !
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// ! 1 ! Step-in ! 0 1 0 u h v r1 r0 !
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// ! 1 ! Step-out ! 0 1 1 u h v r1 r0 !
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// ! 2 ! Rd sectr ! 1 0 0 m h E 0 0 !
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// ! 2 ! Wt sectr ! 1 0 1 m h E P a0 !
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// ! 3 ! Rd addr ! 1 1 0 0 h E 0 0 !
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// ! 3 ! Rd track ! 1 1 1 0 h E 0 0 !
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// ! 3 ! Wt track ! 1 1 1 1 h E P 0 !
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// ! 4 ! Forc int ! 1 1 0 1 i3 i2 i1 i0 !
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// +--------+----------+-------------------------+
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void WD1770::posit_event(int new_event_type) {
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if(new_event_type == int(Event::IndexHole)) {
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index_hole_count_++;
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if(index_hole_count_target_ == index_hole_count_) {
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posit_event(int(Event1770::IndexHoleTarget));
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index_hole_count_target_ = -1;
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}
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// motor power-down
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if(index_hole_count_ == 9 && !status_.busy && has_motor_on_line()) {
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set_motor_on(false);
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}
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// head unload
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if(index_hole_count_ == 15 && !status_.busy && has_head_load_line()) {
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set_head_load_request(false);
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}
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}
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if(new_event_type == int(Event1770::ForceInterrupt)) {
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interesting_event_mask_ = 0;
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resume_point_ = 0;
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update_status([] (Status &status) {
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status.type = Status::One;
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status.data_request = false;
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status.spin_up = false;
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});
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} else {
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if(!(interesting_event_mask_ & int(new_event_type))) return;
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interesting_event_mask_ &= ~new_event_type;
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}
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BEGIN_SECTION()
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// Wait for a new command, branch to the appropriate handler.
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case 0:
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wait_for_command:
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LOG("Idle...");
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set_data_mode(DataMode::Scanning);
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index_hole_count_ = 0;
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update_status([] (Status &status) {
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status.busy = false;
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status.interrupt_request = true;
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});
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WAIT_FOR_EVENT(Event1770::Command);
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update_status([] (Status &status) {
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status.busy = true;
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status.interrupt_request = false;
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status.track_zero = false; // Always reset by a non-type 1; so reset regardless and set properly later.
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});
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LOG("Starting " << PADHEX(2) << int(command_));
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if(!(command_ & 0x80)) goto begin_type_1;
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if(!(command_ & 0x40)) goto begin_type_2;
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goto begin_type_3;
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/*
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Type 1 entry point.
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*/
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// +--------+----------+-------------------------+
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// ! ! ! BITS !
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// ! TYPE ! COMMAND ! 7 6 5 4 3 2 1 0 !
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// +--------+----------+-------------------------+
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// ! 1 ! Restore ! 0 0 0 0 h v r1 r0 !
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// ! 1 ! Seek ! 0 0 0 1 h v r1 r0 !
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// ! 1 ! Step ! 0 0 1 u h v r1 r0 !
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// ! 1 ! Step-in ! 0 1 0 u h v r1 r0 !
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// ! 1 ! Step-out ! 0 1 1 u h v r1 r0 !
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// +--------+----------+-------------------------+
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begin_type_1:
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// Set initial flags, skip spin-up if possible.
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update_status([] (Status &status) {
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status.type = Status::One;
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status.seek_error = false;
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status.crc_error = false;
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status.data_request = false;
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});
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LOG("Step/Seek/Restore with track " << int(track_) << " data " << int(data_));
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if(!has_motor_on_line() && !has_head_load_line()) goto test_type1_type;
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if(has_motor_on_line()) goto begin_type1_spin_up;
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goto begin_type1_load_head;
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begin_type1_load_head:
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if(!(command_&0x08)) {
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set_head_load_request(false);
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goto test_type1_type;
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}
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set_head_load_request(true);
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if(head_is_loaded_) goto test_type1_type;
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WAIT_FOR_EVENT(Event1770::HeadLoad);
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goto test_type1_type;
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begin_type1_spin_up:
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if((command_&0x08) || get_drive().get_motor_on()) {
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set_motor_on(true);
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goto test_type1_type;
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}
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SPIN_UP();
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test_type1_type:
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// Set step direction if this is a step in or out.
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if((command_ >> 5) == 2) step_direction_ = 1;
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if((command_ >> 5) == 3) step_direction_ = 0;
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if((command_ >> 5) != 0) goto perform_step_command;
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// This is now definitely either a seek or a restore; if it's a restore then set track to 0xff and data to 0x00.
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if(!(command_ & 0x10)) {
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track_ = 0xff;
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data_ = 0;
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}
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perform_seek_or_restore_command:
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if(track_ == data_) goto verify_seek;
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step_direction_ = (data_ > track_);
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adjust_track:
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if(step_direction_) ++track_; else --track_;
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perform_step:
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if(!step_direction_ && get_drive().get_is_track_zero()) {
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track_ = 0;
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goto verify_seek;
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}
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get_drive().step(Storage::Disk::HeadPosition(step_direction_ ? 1 : -1));
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Cycles::IntType time_to_wait;
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switch(command_ & 3) {
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default:
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case 0: time_to_wait = 6; break;
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case 1: time_to_wait = 12; break;
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case 2: time_to_wait = (personality_ == P1772) ? 2 : 20; break;
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case 3: time_to_wait = (personality_ == P1772) ? 3 : 30; break;
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}
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WAIT_FOR_TIME(time_to_wait);
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if(command_ >> 5) goto verify_seek;
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goto perform_seek_or_restore_command;
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perform_step_command:
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if(command_ & 0x10) goto adjust_track;
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goto perform_step;
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verify_seek:
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update_status([this] (Status &status) {
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status.track_zero = get_drive().get_is_track_zero();
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});
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if(!(command_ & 0x04)) {
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goto wait_for_command;
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}
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index_hole_count_ = 0;
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distance_into_section_ = 0;
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verify_read_data:
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WAIT_FOR_EVENT(int(Event::IndexHole) | int(Event::Token));
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READ_ID();
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if(index_hole_count_ == 6) {
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LOG("Nothing found to verify");
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update_status([] (Status &status) {
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status.seek_error = true;
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});
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goto wait_for_command;
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}
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if(distance_into_section_ == 7) {
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distance_into_section_ = 0;
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set_data_mode(DataMode::Scanning);
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if(get_crc_generator().get_value()) {
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update_status([] (Status &status) {
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status.crc_error = true;
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});
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goto verify_read_data;
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}
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if(header_[0] == track_) {
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LOG("Reached track " << std::dec << int(track_));
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update_status([] (Status &status) {
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status.crc_error = false;
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});
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goto wait_for_command;
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}
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}
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goto verify_read_data;
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/*
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Type 2 entry point.
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*/
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// +--------+----------+-------------------------+
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// ! ! ! BITS !
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// ! TYPE ! COMMAND ! 7 6 5 4 3 2 1 0 !
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// +--------+----------+-------------------------+
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// ! 2 ! Rd sectr ! 1 0 0 m h E 0 0 !
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// ! 2 ! Wt sectr ! 1 0 1 m h E P a0 !
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// +--------+----------+-------------------------+
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begin_type_2:
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update_status([] (Status &status) {
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status.type = Status::Two;
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status.lost_data = false;
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status.record_not_found = false;
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status.write_protect = false;
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status.record_type = false;
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status.data_request = false;
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});
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distance_into_section_ = 0;
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if((command_&0x08) && has_motor_on_line()) goto test_type2_delay;
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if(!has_motor_on_line() && !has_head_load_line()) {
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if(has_motor_on_line()) set_motor_on(true);
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goto test_type2_delay;
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}
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if(has_motor_on_line()) goto begin_type2_spin_up;
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goto begin_type2_load_head;
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begin_type2_load_head:
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set_head_load_request(true);
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if(head_is_loaded_) goto test_type2_delay;
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WAIT_FOR_EVENT(Event1770::HeadLoad);
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goto test_type2_delay;
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begin_type2_spin_up:
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if(get_drive().get_motor_on()) goto test_type2_delay;
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// Perform spin up.
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SPIN_UP();
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test_type2_delay:
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index_hole_count_ = 0;
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if(!(command_ & 0x04)) goto test_type2_write_protection;
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WAIT_FOR_TIME(30);
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test_type2_write_protection:
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if(command_&0x20 && get_drive().get_is_read_only()) {
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update_status([] (Status &status) {
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status.write_protect = true;
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});
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goto wait_for_command;
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}
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distance_into_section_ = 0;
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set_data_mode(DataMode::Scanning);
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type2_get_header:
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WAIT_FOR_EVENT(int(Event::IndexHole) | int(Event::Token));
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READ_ID();
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if(index_hole_count_ == 5) {
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LOG("Failed to find sector " << std::dec << int(sector_));
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update_status([] (Status &status) {
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status.record_not_found = true;
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});
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goto wait_for_command;
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}
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if(distance_into_section_ == 7) {
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distance_into_section_ = 0;
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set_data_mode(DataMode::Scanning);
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LOG("Considering " << std::dec << int(header_[0]) << "/" << int(header_[2]));
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if( header_[0] == track_ && header_[2] == sector_ &&
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(has_motor_on_line() || !(command_&0x02) || ((command_&0x08) >> 3) == header_[1])) {
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LOG("Found " << std::dec << int(header_[0]) << "/" << int(header_[2]));
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if(get_crc_generator().get_value()) {
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LOG("CRC error; back to searching");
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update_status([] (Status &status) {
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status.crc_error = true;
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});
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goto type2_get_header;
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}
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update_status([] (Status &status) {
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status.crc_error = false;
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});
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goto type2_read_or_write_data;
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}
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}
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goto type2_get_header;
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type2_read_or_write_data:
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if(command_&0x20) goto type2_write_data;
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goto type2_read_data;
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type2_read_data:
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WAIT_FOR_EVENT(Event::Token);
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// TODO: timeout
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if(get_latest_token().type == Token::Data || get_latest_token().type == Token::DeletedData) {
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update_status([this] (Status &status) {
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status.record_type = (get_latest_token().type == Token::DeletedData);
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});
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distance_into_section_ = 0;
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set_data_mode(DataMode::Reading);
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goto type2_read_byte;
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}
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goto type2_read_data;
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type2_read_byte:
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WAIT_FOR_EVENT(Event::Token);
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if(get_latest_token().type != Token::Byte) goto type2_read_byte;
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data_ = get_latest_token().byte_value;
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update_status([] (Status &status) {
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status.lost_data |= status.data_request;
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status.data_request = true;
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});
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distance_into_section_++;
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|
if(distance_into_section_ == 128 << (header_[3]&3)) {
|
|
distance_into_section_ = 0;
|
|
goto type2_check_crc;
|
|
}
|
|
goto type2_read_byte;
|
|
|
|
type2_check_crc:
|
|
WAIT_FOR_EVENT(Event::Token);
|
|
if(get_latest_token().type != Token::Byte) goto type2_read_byte;
|
|
header_[distance_into_section_] = get_latest_token().byte_value;
|
|
distance_into_section_++;
|
|
if(distance_into_section_ == 2) {
|
|
distance_into_section_ = 0;
|
|
set_data_mode(DataMode::Scanning);
|
|
|
|
if(get_crc_generator().get_value()) {
|
|
LOG("CRC error; terminating");
|
|
update_status([] (Status &status) {
|
|
status.crc_error = true;
|
|
});
|
|
goto wait_for_command;
|
|
}
|
|
|
|
LOG("Finished reading sector " << std::dec << int(sector_));
|
|
|
|
if(command_ & 0x10) {
|
|
sector_++;
|
|
LOG("Advancing to search for sector " << std::dec << int(sector_));
|
|
goto test_type2_write_protection;
|
|
}
|
|
goto wait_for_command;
|
|
}
|
|
goto type2_check_crc;
|
|
|
|
|
|
type2_write_data:
|
|
WAIT_FOR_BYTES(2);
|
|
update_status([] (Status &status) {
|
|
status.data_request = true;
|
|
});
|
|
WAIT_FOR_BYTES(9);
|
|
if(status_.data_request) {
|
|
update_status([] (Status &status) {
|
|
status.lost_data = true;
|
|
});
|
|
goto wait_for_command;
|
|
}
|
|
WAIT_FOR_BYTES(1);
|
|
if(get_is_double_density()) {
|
|
WAIT_FOR_BYTES(11);
|
|
}
|
|
|
|
set_data_mode(DataMode::Writing);
|
|
begin_writing(false);
|
|
for(int c = 0; c < (get_is_double_density() ? 12 : 6); c++) {
|
|
write_byte(0);
|
|
}
|
|
WAIT_FOR_EVENT(Event::DataWritten);
|
|
|
|
if(get_is_double_density()) {
|
|
get_crc_generator().set_value(Storage::Encodings::MFM::MFMPostSyncCRCValue);
|
|
for(int c = 0; c < 3; c++) write_raw_short(Storage::Encodings::MFM::MFMSync);
|
|
write_byte((command_&0x01) ? Storage::Encodings::MFM::DeletedDataAddressByte : Storage::Encodings::MFM::DataAddressByte);
|
|
} else {
|
|
get_crc_generator().reset();
|
|
get_crc_generator().add((command_&0x01) ? Storage::Encodings::MFM::DeletedDataAddressByte : Storage::Encodings::MFM::DataAddressByte);
|
|
write_raw_short((command_&0x01) ? Storage::Encodings::MFM::FMDeletedDataAddressMark : Storage::Encodings::MFM::FMDataAddressMark);
|
|
}
|
|
|
|
WAIT_FOR_EVENT(Event::DataWritten);
|
|
distance_into_section_ = 0;
|
|
|
|
type2_write_loop:
|
|
/*
|
|
This deviates from the data sheet slightly since that would prima facie request one more byte
|
|
of data than is actually written; the last time around the loop it has transferred from the
|
|
data register to the data shift register, set data request, written the byte, checked that data
|
|
request has been satified, then finally considers whether all bytes are done. Based on both
|
|
natural expectations and the way that emulated machines responded, I believe that to be a
|
|
documentation error.
|
|
*/
|
|
write_byte(data_);
|
|
distance_into_section_++;
|
|
if(distance_into_section_ == 128 << (header_[3]&3)) {
|
|
goto type2_write_crc;
|
|
}
|
|
|
|
update_status([] (Status &status) {
|
|
status.data_request = true;
|
|
});
|
|
WAIT_FOR_EVENT(Event::DataWritten);
|
|
if(status_.data_request) {
|
|
end_writing();
|
|
update_status([] (Status &status) {
|
|
status.lost_data = true;
|
|
});
|
|
goto wait_for_command;
|
|
}
|
|
|
|
goto type2_write_loop;
|
|
|
|
type2_write_crc:
|
|
write_crc();
|
|
write_byte(0xff);
|
|
WAIT_FOR_EVENT(Event::DataWritten);
|
|
end_writing();
|
|
|
|
if(command_ & 0x10) {
|
|
sector_++;
|
|
goto test_type2_write_protection;
|
|
}
|
|
LOG("Wrote sector " << std::dec << int(sector_));
|
|
goto wait_for_command;
|
|
|
|
|
|
/*
|
|
Type 3 entry point.
|
|
*/
|
|
// +--------+----------+-------------------------+
|
|
// ! ! ! BITS !
|
|
// ! TYPE ! COMMAND ! 7 6 5 4 3 2 1 0 !
|
|
// +--------+----------+-------------------------+
|
|
// ! 3 ! Rd addr ! 1 1 0 0 h E 0 0 !
|
|
// ! 3 ! Rd track ! 1 1 1 0 h E 0 0 !
|
|
// ! 3 ! Wt track ! 1 1 1 1 h E P 0 !
|
|
// +--------+----------+-------------------------+
|
|
begin_type_3:
|
|
update_status([] (Status &status) {
|
|
status.type = Status::Three;
|
|
status.crc_error = false;
|
|
status.lost_data = false;
|
|
status.record_not_found = false;
|
|
});
|
|
if(!has_motor_on_line() && !has_head_load_line()) goto type3_test_delay;
|
|
|
|
if(has_motor_on_line()) goto begin_type3_spin_up;
|
|
goto begin_type3_load_head;
|
|
|
|
begin_type3_load_head:
|
|
set_head_load_request(true);
|
|
if(head_is_loaded_) goto type3_test_delay;
|
|
WAIT_FOR_EVENT(Event1770::HeadLoad);
|
|
goto type3_test_delay;
|
|
|
|
begin_type3_spin_up:
|
|
if((command_&0x08) || get_drive().get_motor_on()) goto type3_test_delay;
|
|
SPIN_UP();
|
|
|
|
type3_test_delay:
|
|
if(!(command_&0x04)) goto test_type3_type;
|
|
WAIT_FOR_TIME(30);
|
|
|
|
test_type3_type:
|
|
if(!(command_&0x20)) goto begin_read_address;
|
|
if(!(command_&0x10)) goto begin_read_track;
|
|
goto begin_write_track;
|
|
|
|
begin_read_address:
|
|
index_hole_count_ = 0;
|
|
distance_into_section_ = 0;
|
|
|
|
read_address_get_header:
|
|
WAIT_FOR_EVENT(int(Event::IndexHole) | int(Event::Token));
|
|
if(new_event_type == int(Event::Token)) {
|
|
if(!distance_into_section_ && get_latest_token().type == Token::ID) {set_data_mode(DataMode::Reading); distance_into_section_++; }
|
|
else if(distance_into_section_ && distance_into_section_ < 7 && get_latest_token().type == Token::Byte) {
|
|
if(status_.data_request) {
|
|
update_status([] (Status &status) {
|
|
status.lost_data = true;
|
|
});
|
|
goto wait_for_command;
|
|
}
|
|
header_[distance_into_section_ - 1] = data_ = get_latest_token().byte_value;
|
|
track_ = header_[0];
|
|
update_status([] (Status &status) {
|
|
status.data_request = true;
|
|
});
|
|
++distance_into_section_;
|
|
|
|
if(distance_into_section_ == 7) {
|
|
distance_into_section_ = 0;
|
|
|
|
if(get_crc_generator().get_value()) {
|
|
update_status([] (Status &status) {
|
|
status.crc_error = true;
|
|
});
|
|
}
|
|
goto wait_for_command;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(index_hole_count_ == 6) {
|
|
update_status([] (Status &status) {
|
|
status.record_not_found = true;
|
|
});
|
|
goto wait_for_command;
|
|
}
|
|
goto read_address_get_header;
|
|
|
|
begin_read_track:
|
|
WAIT_FOR_EVENT(Event::IndexHole);
|
|
index_hole_count_ = 0;
|
|
|
|
read_track_read_byte:
|
|
WAIT_FOR_EVENT(int(Event::Token) | int(Event::IndexHole));
|
|
if(index_hole_count_) {
|
|
goto wait_for_command;
|
|
}
|
|
if(status_.data_request) {
|
|
update_status([] (Status &status) {
|
|
status.lost_data = true;
|
|
});
|
|
goto wait_for_command;
|
|
}
|
|
data_ = get_latest_token().byte_value;
|
|
update_status([] (Status &status) {
|
|
status.data_request = true;
|
|
});
|
|
goto read_track_read_byte;
|
|
|
|
begin_write_track:
|
|
update_status([] (Status &status) {
|
|
status.data_request = false;
|
|
status.lost_data = false;
|
|
});
|
|
|
|
if(get_drive().get_is_read_only()) {
|
|
update_status([] (Status &status) {
|
|
status.write_protect = true;
|
|
});
|
|
goto wait_for_command;
|
|
}
|
|
|
|
update_status([] (Status &status) {
|
|
status.data_request = true;
|
|
});
|
|
WAIT_FOR_BYTES(3);
|
|
if(status_.data_request) {
|
|
update_status([] (Status &status) {
|
|
status.lost_data = true;
|
|
});
|
|
goto wait_for_command;
|
|
}
|
|
|
|
WAIT_FOR_EVENT(Event1770::IndexHoleTarget);
|
|
begin_writing(true);
|
|
index_hole_count_ = 0;
|
|
|
|
write_track_write_loop:
|
|
if(get_is_double_density()) {
|
|
switch(data_) {
|
|
case 0xf5:
|
|
write_raw_short(Storage::Encodings::MFM::MFMSync);
|
|
get_crc_generator().set_value(Storage::Encodings::MFM::MFMPostSyncCRCValue);
|
|
break;
|
|
case 0xf6:
|
|
write_raw_short(Storage::Encodings::MFM::MFMIndexSync);
|
|
break;
|
|
case 0xff:
|
|
write_crc();
|
|
break;
|
|
default:
|
|
write_byte(data_);
|
|
break;
|
|
}
|
|
} else {
|
|
switch(data_) {
|
|
case 0xf8: case 0xf9: case 0xfa: case 0xfb:
|
|
case 0xfd: case 0xfe:
|
|
// clock is 0xc7 = 1010 0000 0010 1010 = 0xa022
|
|
write_raw_short(
|
|
uint16_t(
|
|
0xa022 |
|
|
((data_ & 0x80) << 7) |
|
|
((data_ & 0x40) << 6) |
|
|
((data_ & 0x20) << 5) |
|
|
((data_ & 0x10) << 4) |
|
|
((data_ & 0x08) << 3) |
|
|
((data_ & 0x04) << 2) |
|
|
((data_ & 0x02) << 1) |
|
|
(data_ & 0x01)
|
|
)
|
|
);
|
|
get_crc_generator().reset();
|
|
get_crc_generator().add(data_);
|
|
break;
|
|
case 0xfc:
|
|
write_raw_short(Storage::Encodings::MFM::FMIndexAddressMark);
|
|
break;
|
|
case 0xf7:
|
|
write_crc();
|
|
break;
|
|
default:
|
|
write_byte(data_);
|
|
break;
|
|
}
|
|
}
|
|
|
|
update_status([] (Status &status) {
|
|
status.data_request = true;
|
|
});
|
|
WAIT_FOR_EVENT(Event::DataWritten);
|
|
if(status_.data_request) {
|
|
update_status([] (Status &status) {
|
|
status.lost_data = true;
|
|
});
|
|
end_writing();
|
|
goto wait_for_command;
|
|
}
|
|
if(index_hole_count_) {
|
|
end_writing();
|
|
goto wait_for_command;
|
|
}
|
|
|
|
goto write_track_write_loop;
|
|
|
|
END_SECTION()
|
|
}
|
|
|
|
void WD1770::update_status(std::function<void(Status &)> updater) {
|
|
const Status old_status = status_;
|
|
|
|
if(delegate_) {
|
|
updater(status_);
|
|
const bool did_change =
|
|
(status_.busy != old_status.busy) ||
|
|
(status_.data_request != old_status.data_request) ||
|
|
(status_.interrupt_request != old_status.interrupt_request);
|
|
if(did_change) delegate_->wd1770_did_change_output(this);
|
|
} else updater(status_);
|
|
|
|
if(status_.busy != old_status.busy) update_clocking_observer();
|
|
}
|
|
|
|
void WD1770::set_head_load_request(bool) {}
|
|
void WD1770::set_motor_on(bool) {}
|
|
|
|
void WD1770::set_head_loaded(bool head_loaded) {
|
|
head_is_loaded_ = head_loaded;
|
|
if(head_loaded) posit_event(int(Event1770::HeadLoad));
|
|
}
|
|
|
|
bool WD1770::get_head_loaded() const {
|
|
return head_is_loaded_;
|
|
}
|
|
|
|
ClockingHint::Preference WD1770::preferred_clocking() const {
|
|
if(status_.busy) return ClockingHint::Preference::RealTime;
|
|
return Storage::Disk::MFMController::preferred_clocking();
|
|
}
|