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Adds a one-cycle delay on frequency changes.

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This commit is contained in:
Thomas Harte 2019-12-13 19:57:54 -05:00
parent d5b2e6514a
commit c00ae7ce6a
2 changed files with 14 additions and 2 deletions
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12
Machines/Atari/ST/Video.cpp
View File

@ -105,6 +105,7 @@ const int hsync_end = CYCLE(8); // Cycles before end of line when hsync ends.
}
Video::Video() :
deferrer_([=] (HalfCycles duration) { advance(duration); }),
crt_(1024, 1, Outputs::Display::Type::PAL50, Outputs::Display::InputDataType::Red4Green4Blue4),
shifter_(crt_, palette_) {
@ -122,6 +123,10 @@ void Video::set_scan_target(Outputs::Display::ScanTarget *scan_target) {
}
void Video::run_for(HalfCycles duration) {
deferrer_.run_for(duration);
}
void Video::advance(HalfCycles duration) {
const auto horizontal_timings = horizontal_parameters(field_frequency_);
const auto vertical_timings = vertical_parameters(field_frequency_);
int integer_duration = int(duration.as_integral());
@ -430,8 +435,11 @@ void Video::write(int address, uint16_t value) {
// Sync mode and pixel mode.
case 0x05:
sync_mode_ = value;
update_output_mode();
// Writes to sync mode have a one-cycle delay in effect.
deferrer_.defer(HalfCycles(2), [=] {
sync_mode_ = value;
update_output_mode();
});
break;
case 0x30:
video_mode_ = value;

4
Machines/Atari/ST/Video.hpp
View File

@ -11,6 +11,7 @@
#include "../../../Outputs/CRT/CRT.hpp"
#include "../../../ClockReceiver/ClockReceiver.hpp"
#include "../../../ClockReceiver/DeferredQueue.hpp"
#include <vector>
@ -103,6 +104,9 @@ class Video {
Range get_memory_access_range();
private:
void advance(HalfCycles duration);
DeferredQueue<HalfCycles> deferrer_;
Outputs::CRT::CRT crt_;
RangeObserver *range_observer_ = nullptr;