2016-11-25 12:51:39 +00:00
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//
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2016-09-17 22:01:00 +00:00
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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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2016-09-25 00:12:45 +00:00
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#include "../../Storage/Disk/Encodings/MFM.hpp"
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2016-09-20 02:06:56 +00:00
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using namespace WD;
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2016-09-21 02:14:33 +00:00
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WD1770::WD1770() :
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2016-09-29 01:28:34 +00:00
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Storage::Disk::Controller(8000000, 16, 300),
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2016-09-25 00:12:45 +00:00
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status_(0),
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interesting_event_mask_(Event::Command),
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resume_point_(0),
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2016-09-25 18:11:22 +00:00
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delay_time_(0),
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2016-09-26 01:38:52 +00:00
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index_hole_count_target_(-1),
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2016-09-27 11:36:37 +00:00
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is_awaiting_marker_value_(false),
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2016-11-21 05:21:49 +00:00
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is_reading_data_(false),
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interrupt_request_line_(false),
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data_request_line_(false),
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delegate_(nullptr)
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2016-09-25 00:12:45 +00:00
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{
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2016-09-23 01:28:23 +00:00
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set_is_double_density(false);
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2016-09-25 00:12:45 +00:00
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posit_event(Event::Command);
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2016-09-23 01:25:31 +00:00
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}
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2016-09-20 19:56:31 +00:00
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2016-09-20 02:06:56 +00:00
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void WD1770::set_is_double_density(bool is_double_density)
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{
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2016-09-25 00:12:45 +00:00
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is_double_density_ = is_double_density;
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2016-09-23 01:28:23 +00:00
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Storage::Time bit_length;
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bit_length.length = 1;
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bit_length.clock_rate = is_double_density ? 500000 : 250000;
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set_expected_bit_length(bit_length);
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2016-09-26 01:38:52 +00:00
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if(!is_double_density) is_awaiting_marker_value_ = false;
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2016-09-20 02:06:56 +00:00
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}
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void WD1770::set_register(int address, uint8_t value)
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{
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2016-09-20 19:56:31 +00:00
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switch(address&3)
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{
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case 0:
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2016-11-25 12:51:39 +00:00
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{
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if((value&0xf0) == 0xd0)
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{
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printf("!!!TODO: force interrupt!!!\n");
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}
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else
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{
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command_ = value;
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posit_event(Event::Command);
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}
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}
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2016-09-20 19:56:31 +00:00
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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: data_ = value; break;
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}
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2016-09-20 02:06:56 +00:00
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}
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uint8_t WD1770::get_register(int address)
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{
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2016-09-20 19:56:31 +00:00
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switch(address&3)
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{
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2016-11-21 05:21:49 +00:00
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default: return status_ | (data_request_line_ ? Flag::DataRequest : 0);
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2016-09-20 19:56:31 +00:00
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case 1: return track_;
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case 2: return sector_;
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2016-11-21 05:21:49 +00:00
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case 3: set_data_request(false); return data_;
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2016-09-20 19:56:31 +00:00
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}
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2016-09-20 02:06:56 +00:00
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}
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void WD1770::run_for_cycles(unsigned int number_of_cycles)
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{
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2016-09-26 01:24:16 +00:00
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Storage::Disk::Controller::run_for_cycles((int)number_of_cycles);
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2016-09-25 00:12:45 +00:00
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if(delay_time_)
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{
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if(delay_time_ <= number_of_cycles)
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{
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delay_time_ = 0;
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posit_event(Event::Timer);
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}
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else
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{
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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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void WD1770::process_input_bit(int value, unsigned int cycles_since_index_hole)
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{
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shift_register_ = (shift_register_ << 1) | value;
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bits_since_token_++;
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Token::Type token_type = Token::Byte;
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2016-09-27 11:36:37 +00:00
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if(!is_reading_data_)
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2016-09-25 00:12:45 +00:00
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{
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2016-09-27 11:36:37 +00:00
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if(!is_double_density_)
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2016-09-25 00:12:45 +00:00
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{
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2016-09-27 11:36:37 +00:00
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switch(shift_register_ & 0xffff)
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{
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case Storage::Encodings::MFM::FMIndexAddressMark:
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token_type = Token::Index;
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break;
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case Storage::Encodings::MFM::FMIDAddressMark:
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token_type = Token::ID;
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break;
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case Storage::Encodings::MFM::FMDataAddressMark:
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token_type = Token::Data;
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break;
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case Storage::Encodings::MFM::FMDeletedDataAddressMark:
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token_type = Token::DeletedData;
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break;
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default:
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break;
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}
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2016-09-25 00:12:45 +00:00
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}
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2016-09-27 11:36:37 +00:00
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else
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2016-09-26 01:38:52 +00:00
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{
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2016-09-27 11:36:37 +00:00
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switch(shift_register_ & 0xffff)
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{
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case Storage::Encodings::MFM::MFMIndexAddressMark:
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bits_since_token_ = 0;
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is_awaiting_marker_value_ = true;
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return;
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case Storage::Encodings::MFM::MFMAddressMark:
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bits_since_token_ = 0;
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is_awaiting_marker_value_ = true;
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return;
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default:
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break;
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}
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2016-09-26 01:38:52 +00:00
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}
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2016-09-25 00:12:45 +00:00
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2016-09-27 11:36:37 +00:00
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if(token_type != Token::Byte)
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{
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latest_token_.type = token_type;
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bits_since_token_ = 0;
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posit_event(Event::Token);
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return;
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}
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2016-09-25 00:12:45 +00:00
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}
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if(bits_since_token_ == 16)
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{
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latest_token_.type = Token::Byte;
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latest_token_.byte_value = (uint8_t)(
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((shift_register_ & 0x0001) >> 0) |
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((shift_register_ & 0x0004) >> 1) |
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((shift_register_ & 0x0010) >> 2) |
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((shift_register_ & 0x0040) >> 3) |
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((shift_register_ & 0x0100) >> 4) |
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((shift_register_ & 0x0400) >> 5) |
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((shift_register_ & 0x1000) >> 6) |
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((shift_register_ & 0x4000) >> 7));
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bits_since_token_ = 0;
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2016-09-26 01:38:52 +00:00
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if(is_awaiting_marker_value_ && is_double_density_)
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{
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is_awaiting_marker_value_ = false;
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switch(latest_token_.byte_value)
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{
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case Storage::Encodings::MFM::MFMIndexAddressByte:
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latest_token_.type = Token::Index;
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break;
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case Storage::Encodings::MFM::MFMIDAddressByte:
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latest_token_.type = Token::ID;
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break;
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case Storage::Encodings::MFM::MFMDataAddressByte:
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latest_token_.type = Token::Data;
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break;
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case Storage::Encodings::MFM::MFMDeletedDataAddressByte:
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latest_token_.type = Token::DeletedData;
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break;
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default: break;
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}
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}
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2016-09-25 00:12:45 +00:00
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posit_event(Event::Token);
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return;
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}
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}
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void WD1770::process_index_hole()
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{
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index_hole_count_++;
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posit_event(Event::IndexHole);
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2016-09-25 18:11:22 +00:00
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if(index_hole_count_target_ == index_hole_count_)
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{
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posit_event(Event::IndexHoleTarget);
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index_hole_count_target_ = -1;
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}
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2016-09-25 02:43:12 +00:00
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// motor power-down
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2016-09-26 01:24:16 +00:00
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if(index_hole_count_ == 9 && !(status_&Flag::Busy))
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{
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status_ &= ~Flag::MotorOn;
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set_motor_on(false);
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}
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2016-09-25 00:12:45 +00:00
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}
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2016-09-20 20:58:23 +00:00
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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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2016-09-25 00:12:45 +00:00
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#define WAIT_FOR_EVENT(mask) resume_point_ = __LINE__; interesting_event_mask_ = mask; return; case __LINE__:
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#define WAIT_FOR_TIME(ms) resume_point_ = __LINE__; interesting_event_mask_ = Event::Timer; delay_time_ = ms * 8000; if(delay_time_) return; case __LINE__:
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#define BEGIN_SECTION() switch(resume_point_) { default:
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#define END_SECTION() 0; }
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2016-09-25 13:54:49 +00:00
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#define READ_ID() \
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if(new_event_type == Event::Token) \
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{ \
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2016-09-27 11:36:37 +00:00
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if(!distance_into_section_ && latest_token_.type == Token::ID) {is_reading_data_ = true; distance_into_section_++; } \
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2016-09-25 13:54:49 +00:00
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else if(distance_into_section_ && distance_into_section_ < 7 && latest_token_.type == Token::Byte) \
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{ \
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2016-11-21 05:21:49 +00:00
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header_[distance_into_section_ - 1] = latest_token_.byte_value; \
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2016-09-25 13:54:49 +00:00
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distance_into_section_++; \
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} \
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}
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2016-09-25 00:12:45 +00:00
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2016-09-25 18:11:22 +00:00
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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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status_ |= Flag::MotorOn; \
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2016-09-26 01:24:16 +00:00
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set_motor_on(true); \
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2016-09-25 18:11:22 +00:00
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index_hole_count_ = 0; \
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index_hole_count_target_ = 6; \
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WAIT_FOR_EVENT(Event::IndexHoleTarget);
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2016-09-25 02:04:54 +00:00
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void WD1770::posit_event(Event new_event_type)
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2016-09-25 00:12:45 +00:00
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{
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2016-09-25 02:04:54 +00:00
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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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2016-09-25 00:12:45 +00:00
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BEGIN_SECTION()
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// Wait for a new command, branch to the appropriate handler.
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wait_for_command:
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2016-09-25 02:04:54 +00:00
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printf("Idle...\n");
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2016-09-27 11:36:37 +00:00
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is_reading_data_ = false;
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2016-09-25 02:04:54 +00:00
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status_ &= ~Flag::Busy;
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2016-09-25 02:43:12 +00:00
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index_hole_count_ = 0;
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2016-09-25 00:12:45 +00:00
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WAIT_FOR_EVENT(Event::Command);
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2016-11-25 13:24:25 +00:00
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WAIT_FOR_TIME(1); // TODO: what should the time cost here really be?
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2016-09-25 02:04:54 +00:00
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printf("Starting %02x\n", command_);
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2016-09-25 00:12:45 +00:00
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status_ |= Flag::Busy;
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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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begin_type_1:
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// Set initial flags, skip spin-up if possible.
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2016-11-21 05:21:49 +00:00
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status_ &= ~Flag::SeekError;
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2016-09-25 00:12:45 +00:00
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set_interrupt_request(false);
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2016-11-21 05:21:49 +00:00
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set_data_request(false);
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2016-09-25 02:04:54 +00:00
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if((command_&0x08) || (status_ & Flag::MotorOn)) goto test_type1_type;
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2016-09-25 00:12:45 +00:00
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// Perform spin up.
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2016-09-25 18:11:22 +00:00
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SPIN_UP();
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2016-09-25 02:04:54 +00:00
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status_ |= Flag::SpinUp;
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2016-09-25 00:12:45 +00:00
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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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2016-09-25 02:43:12 +00:00
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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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{
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track_ = 0xff;
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data_ = 0;
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}
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2016-09-25 00:12:45 +00:00
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perform_seek_or_restore_command:
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if(track_ == data_) goto verify;
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2016-09-25 02:04:54 +00:00
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step_direction_ = (data_ > track_);
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2016-09-25 00:12:45 +00:00
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adjust_track:
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2016-09-25 02:04:54 +00:00
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if(step_direction_) track_++; else track_--;
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2016-09-25 00:12:45 +00:00
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perform_step:
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if(!step_direction_ && get_is_track_zero())
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{
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track_ = 0;
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goto verify;
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}
|
2016-09-25 02:48:45 +00:00
|
|
|
step(step_direction_ ? 1 : -1);
|
2016-09-25 00:12:45 +00:00
|
|
|
int time_to_wait;
|
|
|
|
switch(command_ & 3)
|
|
|
|
{
|
2016-09-20 19:56:31 +00:00
|
|
|
default:
|
2016-09-25 00:12:45 +00:00
|
|
|
case 0: time_to_wait = 6; break; // 2 on a 1772
|
|
|
|
case 1: time_to_wait = 12; break; // 3 on a 1772
|
|
|
|
case 2: time_to_wait = 20; break; // 5 on a 1772
|
|
|
|
case 3: time_to_wait = 30; break; // 6 on a 1772
|
2016-09-20 19:56:31 +00:00
|
|
|
}
|
2016-09-25 00:16:23 +00:00
|
|
|
WAIT_FOR_TIME(time_to_wait);
|
2016-09-25 00:12:45 +00:00
|
|
|
if(command_ >> 5) goto verify;
|
|
|
|
goto perform_seek_or_restore_command;
|
2016-09-21 02:14:33 +00:00
|
|
|
|
2016-09-25 00:12:45 +00:00
|
|
|
perform_step_command:
|
|
|
|
if(command_ & 0x10) goto adjust_track;
|
|
|
|
goto perform_step;
|
2016-09-21 02:14:33 +00:00
|
|
|
|
2016-09-25 00:12:45 +00:00
|
|
|
verify:
|
|
|
|
if(!(command_ & 0x04))
|
|
|
|
{
|
|
|
|
set_interrupt_request(true);
|
|
|
|
goto wait_for_command;
|
|
|
|
}
|
2016-09-23 01:25:31 +00:00
|
|
|
|
2016-09-25 13:54:49 +00:00
|
|
|
index_hole_count_ = 0;
|
2016-09-26 01:44:46 +00:00
|
|
|
distance_into_section_ = 0;
|
2016-09-25 13:54:49 +00:00
|
|
|
|
|
|
|
verify_read_data:
|
|
|
|
WAIT_FOR_EVENT(Event::IndexHole | Event::Token);
|
|
|
|
READ_ID();
|
|
|
|
|
|
|
|
if(index_hole_count_ == 6)
|
|
|
|
{
|
|
|
|
set_interrupt_request(true);
|
|
|
|
status_ |= Flag::SeekError;
|
|
|
|
goto wait_for_command;
|
|
|
|
}
|
|
|
|
if(distance_into_section_ == 7)
|
|
|
|
{
|
2016-09-27 11:36:37 +00:00
|
|
|
is_reading_data_ = false;
|
2016-09-25 13:54:49 +00:00
|
|
|
// TODO: CRC check
|
2016-11-21 05:21:49 +00:00
|
|
|
if(header_[0] == track_)
|
2016-09-25 13:54:49 +00:00
|
|
|
{
|
2016-09-27 11:36:37 +00:00
|
|
|
printf("Reached track %d\n", track_);
|
2016-09-25 13:54:49 +00:00
|
|
|
status_ &= ~Flag::CRCError;
|
|
|
|
set_interrupt_request(true);
|
|
|
|
goto wait_for_command;
|
|
|
|
}
|
|
|
|
|
|
|
|
distance_into_section_ = 0;
|
|
|
|
}
|
|
|
|
goto verify_read_data;
|
2016-09-25 00:12:45 +00:00
|
|
|
|
2016-09-25 02:04:54 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
Type 2 entry point.
|
|
|
|
*/
|
2016-09-25 00:12:45 +00:00
|
|
|
begin_type_2:
|
2016-11-21 05:21:49 +00:00
|
|
|
status_ &= ~(Flag::LostData | Flag::RecordNotFound | Flag::WriteProtect | Flag::RecordType);
|
2016-09-25 02:04:54 +00:00
|
|
|
set_interrupt_request(false);
|
2016-11-21 05:21:49 +00:00
|
|
|
set_data_request(false);
|
2016-09-25 02:29:02 +00:00
|
|
|
distance_into_section_ = 0;
|
2016-09-25 02:04:54 +00:00
|
|
|
if((command_&0x08) || (status_ & Flag::MotorOn)) goto test_type2_delay;
|
|
|
|
|
|
|
|
// Perform spin up.
|
2016-09-25 18:11:22 +00:00
|
|
|
SPIN_UP();
|
2016-09-25 02:04:54 +00:00
|
|
|
|
|
|
|
test_type2_delay:
|
|
|
|
index_hole_count_ = 0;
|
|
|
|
if(!(command_ & 0x04)) goto test_type2_write_protection;
|
|
|
|
WAIT_FOR_TIME(30);
|
|
|
|
|
|
|
|
test_type2_write_protection:
|
|
|
|
if(command_&0x20) // TODO:: && is_write_protected
|
|
|
|
{
|
|
|
|
set_interrupt_request(true);
|
|
|
|
status_ |= Flag::WriteProtect;
|
|
|
|
goto wait_for_command;
|
|
|
|
}
|
|
|
|
|
|
|
|
type2_get_header:
|
|
|
|
WAIT_FOR_EVENT(Event::IndexHole | Event::Token);
|
2016-09-25 13:54:49 +00:00
|
|
|
READ_ID();
|
|
|
|
|
|
|
|
if(index_hole_count_ == 5)
|
2016-09-25 02:04:54 +00:00
|
|
|
{
|
|
|
|
set_interrupt_request(true);
|
|
|
|
status_ |= Flag::RecordNotFound;
|
|
|
|
goto wait_for_command;
|
|
|
|
}
|
2016-09-25 13:54:49 +00:00
|
|
|
if(distance_into_section_ == 7)
|
|
|
|
{
|
2016-09-27 11:36:37 +00:00
|
|
|
is_reading_data_ = false;
|
2016-11-21 05:21:49 +00:00
|
|
|
if(header_[0] == track_ && header_[2] == sector_)
|
2016-09-25 13:54:49 +00:00
|
|
|
{
|
|
|
|
// TODO: test CRC
|
|
|
|
goto type2_read_or_write_data;
|
|
|
|
}
|
|
|
|
distance_into_section_ = 0;
|
|
|
|
}
|
2016-09-25 02:04:54 +00:00
|
|
|
goto type2_get_header;
|
|
|
|
|
2016-09-25 00:12:45 +00:00
|
|
|
|
2016-09-25 02:04:54 +00:00
|
|
|
type2_read_or_write_data:
|
2016-09-25 02:29:02 +00:00
|
|
|
if(command_&0x20) goto type2_write_data;
|
|
|
|
goto type2_read_data;
|
|
|
|
|
|
|
|
type2_read_data:
|
|
|
|
WAIT_FOR_EVENT(Event::Token);
|
|
|
|
// TODO: timeout
|
|
|
|
if(latest_token_.type == Token::Data || latest_token_.type == Token::DeletedData)
|
|
|
|
{
|
|
|
|
status_ |= (latest_token_.type == Token::DeletedData) ? Flag::RecordType : 0;
|
|
|
|
distance_into_section_ = 0;
|
2016-09-27 11:36:37 +00:00
|
|
|
is_reading_data_ = true;
|
2016-09-25 02:29:02 +00:00
|
|
|
goto type2_read_byte;
|
|
|
|
}
|
|
|
|
goto type2_read_data;
|
|
|
|
|
|
|
|
type2_read_byte:
|
|
|
|
WAIT_FOR_EVENT(Event::Token);
|
|
|
|
if(latest_token_.type != Token::Byte) goto type2_read_byte;
|
2016-11-21 05:21:49 +00:00
|
|
|
if(data_request_line_) status_ |= Flag::LostData;
|
2016-09-25 02:29:02 +00:00
|
|
|
data_ = latest_token_.byte_value;
|
2016-11-21 05:21:49 +00:00
|
|
|
set_data_request(true);
|
2016-09-25 02:29:02 +00:00
|
|
|
distance_into_section_++;
|
2016-11-21 05:21:49 +00:00
|
|
|
if(distance_into_section_ == 128 << header_[3])
|
2016-09-25 02:35:34 +00:00
|
|
|
{
|
|
|
|
distance_into_section_ = 0;
|
|
|
|
goto type2_check_crc;
|
|
|
|
}
|
|
|
|
goto type2_read_byte;
|
|
|
|
|
|
|
|
type2_check_crc:
|
|
|
|
WAIT_FOR_EVENT(Event::Token);
|
|
|
|
if(latest_token_.type != Token::Byte) goto type2_read_byte;
|
2016-11-21 05:21:49 +00:00
|
|
|
header_[distance_into_section_] = latest_token_.byte_value;
|
2016-09-25 02:35:34 +00:00
|
|
|
distance_into_section_++;
|
|
|
|
if(distance_into_section_ == 2)
|
2016-09-25 02:29:02 +00:00
|
|
|
{
|
|
|
|
// TODO: check CRC
|
|
|
|
if(command_ & 0x10)
|
|
|
|
{
|
|
|
|
sector_++;
|
|
|
|
goto test_type2_write_protection;
|
|
|
|
}
|
|
|
|
set_interrupt_request(true);
|
2016-09-27 11:36:37 +00:00
|
|
|
printf("Read sector %d\n", sector_);
|
2016-09-25 02:29:02 +00:00
|
|
|
goto wait_for_command;
|
|
|
|
}
|
2016-09-25 02:35:34 +00:00
|
|
|
goto type2_check_crc;
|
|
|
|
|
2016-09-25 02:29:02 +00:00
|
|
|
|
|
|
|
type2_write_data:
|
2016-09-25 02:04:54 +00:00
|
|
|
printf("!!!TODO: data portion of sector!!!\n");
|
2016-09-25 00:12:45 +00:00
|
|
|
|
|
|
|
begin_type_3:
|
|
|
|
printf("!!!TODO: type 3 commands!!!\n");
|
|
|
|
|
|
|
|
|
|
|
|
END_SECTION()
|
2016-09-21 02:14:33 +00:00
|
|
|
}
|
2016-11-21 05:21:49 +00:00
|
|
|
|
|
|
|
void WD1770::set_interrupt_request(bool interrupt_request)
|
|
|
|
{
|
|
|
|
if(interrupt_request_line_ != interrupt_request)
|
|
|
|
{
|
|
|
|
interrupt_request_line_ = interrupt_request;
|
|
|
|
if(delegate_) delegate_->wd1770_did_change_interrupt_request_status(this);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void WD1770::set_data_request(bool data_request)
|
|
|
|
{
|
|
|
|
if(data_request_line_ != data_request)
|
|
|
|
{
|
|
|
|
data_request_line_ = data_request;
|
|
|
|
if(delegate_) delegate_->wd1770_did_change_data_request_status(this);
|
|
|
|
}
|
|
|
|
}
|