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Added a quick version of read track.

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This commit is contained in:
Thomas Harte 2017-08-14 14:34:56 -04:00
parent 7b8bb0297a
commit 9038ba622e
1 changed files with 46 additions and 6 deletions
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52
Components/8272/i8272.cpp
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@ -371,7 +371,7 @@ void i8272::posit_event(int event_type) {
// data request once the byte has been taken. Continues until all bytes have been read.
//
// TODO: consider DTL.
get_byte:
read_data_get_byte:
WAIT_FOR_EVENT(Event::Token);
result_stack_.push_back(get_latest_token().byte_value);
distance_into_section_++;
@ -381,7 +381,7 @@ void i8272::posit_event(int event_type) {
switch(event_type) {
case (int)Event8272::ResultEmpty: // The caller read the byte in time; proceed as normal.
ResetDataRequest();
if(distance_into_section_ < (128 << size_)) goto get_byte;
if(distance_into_section_ < (128 << size_)) goto read_data_get_byte;
break;
case (int)Event::Token: // The caller hasn't read the old byte yet and a new one has arrived
SetOverrun();
@ -485,10 +485,6 @@ void i8272::posit_event(int event_type) {
goto post_st012chrn;
read_track:
printf("Read track unimplemented!!\n");
goto wait_for_command;
// Performs the read ID command.
read_id:
// Establishes the drive and head being addressed, and whether in double density mode.
@ -515,6 +511,50 @@ void i8272::posit_event(int event_type) {
goto post_st012chrn;
// Performs read track.
read_track:
printf("Read track [%02x %02x %02x %02x]\n", command_[2], command_[3], command_[4], command_[5]);
if(!dma_mode_) SetNonDMAExecution();
SET_DRIVE_HEAD_MFM();
// Wait for the index hole.
WAIT_FOR_EVENT(Event::IndexHole);
sector_ = 0;
index_hole_limit_ = 2;
// While not index hole again, stream all sector contents until EOT sectors have been read.
read_track_next_sector:
FIND_HEADER();
if(!index_hole_limit_) {
if(!sector_) {
SetMissingAddressMark();
goto abort_read_write;
} else {
goto post_st012chrn;
}
}
READ_HEADER();
FIND_DATA();
distance_into_section_ = 0;
SetDataDirectionToProcessor();
read_track_get_byte:
WAIT_FOR_EVENT(Event::Token);
result_stack_.push_back(get_latest_token().byte_value);
distance_into_section_++;
SetDataRequest();
// TODO: other possible exit conditions; find a way to merge with the read_data version of this.
WAIT_FOR_EVENT((int)Event8272::ResultEmpty);
ResetDataRequest();
if(distance_into_section_ < (128 << header_[2])) goto read_track_get_byte;
sector_++;
if(sector_ < command_[6]) goto read_track_next_sector;
goto post_st012chrn;
// Performs format [/write] track.
format_track:
printf("Format track\n");
if(!dma_mode_) SetNonDMAExecution();