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This is the start of my slog through type 1 commands. I kind of need to figure out what I'm doing about drives and PLLs now though.

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This commit is contained in:
Thomas Harte 2016-09-20 16:58:23 -04:00
parent 3b97b038b9
commit 7a34ae0da6
2 changed files with 111 additions and 2 deletions
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96
Components/1770/1770.cpp
View File

@ -67,8 +67,102 @@ void WD1770::run_for_cycles(unsigned int number_of_cycles)
}
continue;
case State::BeginType1:
status_ |= Flag::Busy;
status_ &= ~(Flag::DataRequest | Flag::CRCError);
set_interrupt_request(false);
state_ = State::BeginType1PostSpin;
if(command_ & 0x08)
{
wait_six_index_pulses_.next_state = state_;
wait_six_index_pulses_.count = 0;
state_ = State::WaitForSixIndexPulses;
}
continue;
// case State::WaitForSixIndexPulses:
// continue;
case State::BeginType1PostSpin:
switch(command_ >> 4)
{
case 0: // restore
track_ = 0xff; // deliberate fallthrough
case 1: // seek
data_ = 0x00;
break;
case 2: case 3: // step
break;
case 4: case 5: // step in
is_step_in_ = true;
break;
case 6: case 7: // step out
is_step_in_ = false;
break;
}
if(!(command_ >> 5))
state_ = State::TestTrack;
else
state_ = (command_ & 0x10) ? State::TestDirection : State::TestHead;
continue;
case State::TestTrack:
data_shift_register_ = data_;
if(track_ == data_shift_register_)
state_ = State::TestVerify;
else
{
is_step_in_ = (data_shift_register_ < track_);
state_ = State::TestDirection;
}
continue;
case State::TestDirection:
track_ += is_step_in_ ? -1 : +1;
state_ = State::TestHead;
continue;
// case State::TestHead:
// break;
case State::TestVerify:
if(command_ & 0x04)
{
state_ = State::VerifyTrack;
}
else
{
set_interrupt_request(true);
status_ &= ~Flag::Busy;
state_ = State::Waiting;
}
break;
// +------+----------+-------------------------+
// ! ! ! BITS !
// ! TYPE ! COMMAND ! 7 6 5 4 3 2 1 0 !
// +------+----------+-------------------------+
// ! 1 ! Restore ! 0 0 0 0 h v r1 r0 !
// ! 1 ! Seek ! 0 0 0 1 h v r1 r0 !
// ! 1 ! Step ! 0 0 1 u h v r1 r0 !
// ! 1 ! Step-in ! 0 1 0 u h v r1 r0 !
// ! 1 ! Step-out ! 0 1 1 u h v r1 r0 !
// ! 2 ! Rd sectr ! 1 0 0 m h E 0 0 !
// ! 2 ! Wt sectr ! 1 0 1 m h E P a0 !
// ! 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 !
// ! 4 ! Forc int ! 1 1 0 1 i3 i2 i1 i0 !
// +------+----------+-------------------------+
default:
printf("Unhandled state %d!", state_);
{
static bool has_hit_error = false;
if(!has_hit_error)
printf("Unhandled state %d!\n", state_);
has_hit_error = true;
}
return;
}
}

17
Components/1770/1770.hpp
View File

@ -43,15 +43,30 @@ class WD1770 {
enum class State {
Waiting,
BeginType1, BeginType2, BeginType3
BeginType1, BeginType2, BeginType3,
BeginType1PostSpin,
WaitForSixIndexPulses,
TestTrack, TestDirection, TestHead,
TestVerify, VerifyTrack
} state_;
union {
struct {
int count;
State next_state;
} wait_six_index_pulses_;
};
uint8_t status_;
uint8_t track_;
uint8_t sector_;
uint8_t data_;
uint8_t command_;
bool has_command_;
void set_interrupt_request(bool interrupt_request) {}
bool is_step_in_;
uint8_t data_shift_register_;
};
}