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Started implementing write sector on the 1770, immediately deciding it would be useful to have a callback for end-of-queued-data-written from disk controller. So had a go at implementing that, naively. More investigation required.

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This commit is contained in:
Thomas Harte
2016-12-25 12:31:38 -05:00
parent 901f19f89c
commit aceb7e3b6b
3 changed files with 78 additions and 4 deletions
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Components/1770/1770.cpp
+36 -2
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@@ -11,6 +11,8 @@
using namespace WD;
unsigned int counter = 0;
WD1770::Status::Status() :
type(Status::One),
write_protect(false),
@@ -74,7 +76,12 @@ void WD1770::set_register(int address, uint8_t value)
break;
case 1: track_ = value; break;
case 2: sector_ = value; break;
case 3: data_ = value; break;
case 3:
data_ = value;
update_status([] (Status &status) {
status.data_request = false;
});
break;
}
}
@@ -136,6 +143,7 @@ uint8_t WD1770::get_register(int address)
void WD1770::run_for_cycles(unsigned int number_of_cycles)
{
counter += number_of_cycles;
Storage::Disk::Controller::run_for_cycles((int)number_of_cycles);
if(delay_time_)
@@ -288,6 +296,7 @@ void WD1770::process_index_hole()
#define WAIT_FOR_EVENT(mask) resume_point_ = __LINE__; interesting_event_mask_ = mask; return; case __LINE__:
#define WAIT_FOR_TIME(ms) resume_point_ = __LINE__; interesting_event_mask_ = Event::Timer; delay_time_ = ms * 8000; if(delay_time_) return; case __LINE__:
#define WAIT_FOR_BYTES(count) resume_point_ = __LINE__; interesting_event_mask_ = Event::Token; distance_into_section_ = 0; return; case __LINE__: if(latest_token_.type == Token::Byte) distance_into_section_++; if(distance_into_section_ < count) { interesting_event_mask_ = Event::Token; return; }
#define BEGIN_SECTION() switch(resume_point_) { default:
#define END_SECTION() 0; }
@@ -586,7 +595,32 @@ void WD1770::posit_event(Event new_event_type)
type2_write_data:
printf("!!!TODO: data portion of sector!!!\n");
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(is_double_density_)
{
WAIT_FOR_BYTES(11);
}
begin_writing();
for(int c = 0; c < (is_double_density_ ? 12 : 6); c++)
{
// zero is encoded the same way in both FM and MFM
for(int b = 0; b < 16; b++)
write_bit(!(b&1));
}
end_writing();
begin_type_3:
update_status([] (Status &status) {