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Corrects accidental use of sector contents as addresses in multi-sector reads and writes.

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As a secondary defect, this was also causing erroneous CRC error reports.
This commit is contained in:
Thomas Harte 2019-12-22 19:58:02 -05:00
parent d25b48878c
commit b035b92f33
1 changed files with 17 additions and 6 deletions
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23
Components/1770/1770.cpp
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@ -324,7 +324,9 @@ void WD1770::posit_event(int new_event_type) {
goto wait_for_command;
}
if(distance_into_section_ == 7) {
distance_into_section_ = 0;
set_data_mode(DataMode::Scanning);
if(get_crc_generator().get_value()) {
update_status([] (Status &status) {
status.crc_error = true;
@ -339,8 +341,6 @@ void WD1770::posit_event(int new_event_type) {
});
goto wait_for_command;
}
distance_into_section_ = 0;
}
goto verify_read_data;
@ -397,6 +397,9 @@ void WD1770::posit_event(int new_event_type) {
goto wait_for_command;
}
distance_into_section_ = 0;
set_data_mode(DataMode::Scanning);
type2_get_header:
WAIT_FOR_EVENT(static_cast<int>(Event::IndexHole) | static_cast<int>(Event::Token));
READ_ID();
@ -409,8 +412,10 @@ void WD1770::posit_event(int new_event_type) {
goto wait_for_command;
}
if(distance_into_section_ == 7) {
LOG("Considering " << std::dec << int(header_[0]) << "/" << int(header_[2]));
distance_into_section_ = 0;
set_data_mode(DataMode::Scanning);
LOG("Considering " << std::dec << int(header_[0]) << "/" << int(header_[2]));
if( header_[0] == track_ && header_[2] == sector_ &&
(has_motor_on_line() || !(command_&0x02) || ((command_&0x08) >> 3) == header_[1])) {
LOG("Found " << std::dec << int(header_[0]) << "/" << int(header_[2]));
@ -427,7 +432,6 @@ void WD1770::posit_event(int new_event_type) {
});
goto type2_read_or_write_data;
}
distance_into_section_ = 0;
}
goto type2_get_header;
@ -470,6 +474,9 @@ void WD1770::posit_event(int new_event_type) {
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([this] (Status &status) {
@ -478,11 +485,13 @@ void WD1770::posit_event(int new_event_type) {
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;
}
LOG("Finished reading sector " << std::dec << int(sector_));
goto wait_for_command;
}
goto type2_check_crc;
@ -630,9 +639,11 @@ void WD1770::posit_event(int new_event_type) {
update_status([] (Status &status) {
status.data_request = true;
});
distance_into_section_++;
++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;