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Switches to proper SCSI terminology and better attempts a command phase.

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This commit is contained in:
Thomas Harte 2019-08-18 15:10:07 -04:00
parent 0e0c789b02
commit 8339e2044c
2 changed files with 14 additions and 10 deletions
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16
Components/5380/DirectAccessDevice.cpp
View File

@ -25,26 +25,30 @@ void DirectAccessDevice::scsi_bus_did_change(Bus *, BusState new_state) {
time."
*/
switch(state_) {
case State::Inactive:
switch(phase_) {
case Phase::AwaitingSelection:
if(
(new_state & scsi_id_mask_) &&
((new_state & (Line::SelectTarget | Line::Busy | Line::Input)) == Line::SelectTarget)
) {
state_ = State::Selected;
bus_state_ |= Line::Busy | Line::Request;
phase_ = Phase::Command;
bus_state_ |= Line::Busy | Line::Request | Line::Control; // Initiate the command phase: request a command byte.
bus_.set_device_output(scsi_bus_device_id_, bus_state_);
}
break;
case State::Selected:
case Phase::Command:
switch(new_state & (Line::Request | Line::Acknowledge)) {
// If request and acknowledge are both enabled, grab a byte and cancel the request.
case Line::Request | Line::Acknowledge:
bus_state_ &= ~Line::Request;
printf("Got %02x maybe?\n", bus_state_ & 0xff);
// TODO: is the command phase over?
break;
case Line::Acknowledge:
// The reset of request has caused the initiator to reset acknowledge, so it is now
// safe to request the next byte.
case 0:
bus_state_ |= Line::Request;
break;

8
Components/5380/DirectAccessDevice.hpp
View File

@ -32,10 +32,10 @@ class DirectAccessDevice: public Bus::Observer {
const BusState scsi_id_mask_;
const size_t scsi_bus_device_id_;
enum class State {
Inactive,
Selected
} state_ = State::Inactive;
enum class Phase {
AwaitingSelection,
Command
} phase_ = Phase::AwaitingSelection;
BusState bus_state_ = DefaultBusState;
};