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The keyboard now responds to a reset on its serial line.

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This commit is contained in:
Thomas Harte 2019-10-20 23:13:44 -04:00
parent 75c3e2dacd
commit 83d73fb088
2 changed files with 22 additions and 1 deletions
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2
Components/SerialPort/SerialPort.cpp
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@ -15,6 +15,8 @@ void Line::set_writer_clock_rate(int clock_rate) {
}
void Line::advance_writer(int cycles) {
if(!cycles) return;
remaining_delays_ = std::max(remaining_delays_ - cycles, 0);
if(events_.empty()) {
write_cycles_since_delegate_call_ += cycles;

21
Machines/AtariST/AtariST.cpp
View File

@ -36,7 +36,8 @@ const int CLOCK_RATE = 8000000;
keyboard input and output and mouse handling.
*/
class IntelligentKeyboard:
public Serial::Line::ReadDelegate {
public Serial::Line::ReadDelegate,
public ClockingHint::Source {
public:
IntelligentKeyboard(Serial::Line &input, Serial::Line &output) : output_line_(output) {
input.set_read_delegate(this, Storage::Time(2, 15625));
@ -54,6 +55,14 @@ class IntelligentKeyboard:
return true;
}
ClockingHint::Preference preferred_clocking() final {
return output_line_.transmission_data_time_remaining() ? ClockingHint::Preference::RealTime : ClockingHint::Preference::None;
}
void run_for(HalfCycles duration) {
output_line_.advance_writer(duration.as_int());
}
private:
// MARK: - Serial line state.
int bit_count_ = 0;
@ -63,6 +72,7 @@ class IntelligentKeyboard:
void output_byte(uint8_t value) {
// Wrap the value in a start and stop bit, and send it on its way.
output_line_.write(2, 10, 0x200 | (value << 1));
update_clocking_observer();
}
// MARK: - Command dispatch.
@ -242,6 +252,7 @@ class ConcreteMachine:
midi_acia_->set_clocking_hint_observer(this);
keyboard_acia_->set_clocking_hint_observer(this);
ikbd_.set_clocking_hint_observer(this);
}
~ConcreteMachine() {
@ -528,6 +539,11 @@ class ConcreteMachine:
midi_acia_.flush();
}
if(keyboard_needs_clock_) {
cycles_since_ikbd_update_ += length;
ikbd_.run_for(cycles_since_ikbd_update_.divide(HalfCycles(512)));
}
while(length >= cycles_until_video_event_) {
length -= cycles_until_video_event_;
video_ += cycles_until_video_event_;
@ -557,6 +573,7 @@ class ConcreteMachine:
Outputs::Speaker::LowpassSpeaker<GI::AY38910::AY38910> speaker_;
HalfCycles cycles_since_audio_update_;
HalfCycles cycles_since_ikbd_update_;
IntelligentKeyboard ikbd_;
std::vector<uint16_t> ram_;
@ -568,12 +585,14 @@ class ConcreteMachine:
BusDevice memory_map_[256];
bool may_defer_acias_ = true;
bool keyboard_needs_clock_ = false;
void set_component_prefers_clocking(ClockingHint::Source *component, ClockingHint::Preference clocking) final {
// This is being called by one of the components; avoid any time flushing here as that's
// already dealt with (and, just to be absolutely sure, to avoid recursive mania).
may_defer_acias_ =
(keyboard_acia_.last_valid()->preferred_clocking() != ClockingHint::Preference::RealTime) &&
(midi_acia_.last_valid()->preferred_clocking() != ClockingHint::Preference::RealTime);
keyboard_needs_clock_ = ikbd_.preferred_clocking() != ClockingHint::Preference::None;
}
};