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Switches the drive-speed accumulator to the delegate pattern.

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This allows the Macintosh to ensure that the IWM is kept up just-in-time with drive speed changes.
This commit is contained in:
Thomas Harte 2019-08-07 21:39:23 -04:00
parent f26a200d78
commit bac0461f7f
3 changed files with 21 additions and 20 deletions
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11
Machines/Apple/Macintosh/DriveSpeedAccumulator.cpp
View File

@ -11,7 +11,7 @@
using namespace Apple::Macintosh;
void DriveSpeedAccumulator::post_sample(uint8_t sample) {
if(!number_of_drives_) return;
if(!delegate_) return;
// An Euler-esque approximation is used here: just collect all
// the samples until there is a certain small quantity of them,
@ -50,14 +50,7 @@ void DriveSpeedAccumulator::post_sample(uint8_t sample) {
const float normalised_sum = float(sum) / float(samples_.size());
const float rotation_speed = (normalised_sum * 27.08f) - 259.0f;
for(int c = 0; c < number_of_drives_; ++c) {
drives_[c]->set_rotation_speed(rotation_speed);
}
// printf("RPM: %0.2f (%d sum)\n", rotation_speed, sum);
delegate_->drive_speed_accumulator_set_drive_speed(this, rotation_speed);
}
}
void DriveSpeedAccumulator::add_drive(Apple::Macintosh::DoubleDensityDrive *drive) {
drives_[number_of_drives_] = drive;
++number_of_drives_;
}

16
Machines/Apple/Macintosh/DriveSpeedAccumulator.hpp
View File

@ -13,8 +13,6 @@
#include <cstddef>
#include <cstdint>
#include "../../../Components/DiskII/MacintoshDoubleDensityDrive.hpp"
namespace Apple {
namespace Macintosh {
@ -25,18 +23,20 @@ class DriveSpeedAccumulator {
*/
void post_sample(uint8_t sample);
struct Delegate {
virtual void drive_speed_accumulator_set_drive_speed(DriveSpeedAccumulator *, float speed) = 0;
};
/*!
Adds a connected drive. Up to two of these
can be supplied. Only Macintosh DoubleDensityDrives
are supported.
Sets the delegate to receive drive speed changes.
*/
void add_drive(Apple::Macintosh::DoubleDensityDrive *drive);
void set_delegate(Delegate *delegate) {
delegate_ = delegate;;
}
private:
std::array<uint8_t, 20> samples_;
std::size_t sample_pointer_ = 0;
Apple::Macintosh::DoubleDensityDrive *drives_[2] = {nullptr, nullptr};
int number_of_drives_ = 0;
Delegate *delegate_ = nullptr;
};
}

14
Machines/Apple/Macintosh/Macintosh.cpp
View File

@ -57,7 +57,8 @@ template <Analyser::Static::Macintosh::Target::Model model> class ConcreteMachin
public CPU::MC68000::BusHandler,
public KeyboardMachine::MappedMachine,
public Zilog::SCC::z8530::Delegate,
public Activity::Source {
public Activity::Source,
public DriveSpeedAccumulator::Delegate {
public:
using Target = Analyser::Static::Macintosh::Target;
@ -119,8 +120,9 @@ template <Analyser::Static::Macintosh::Target::Model model> class ConcreteMachin
iwm_->set_drive(1, &drives_[1]);
// If they are 400kb drives, also attach them to the drive-speed accumulator.
if(!drives_[0].is_800k()) drive_speed_accumulator_.add_drive(&drives_[0]);
if(!drives_[1].is_800k()) drive_speed_accumulator_.add_drive(&drives_[1]);
if(!drives_[0].is_800k() || !drives_[1].is_800k()) {
drive_speed_accumulator_.set_delegate(this);
}
// Make sure interrupt changes from the SCC are observed.
scc_.set_delegate(this);
@ -444,6 +446,12 @@ template <Analyser::Static::Macintosh::Target::Model model> class ConcreteMachin
}
private:
void drive_speed_accumulator_set_drive_speed(DriveSpeedAccumulator *, float speed) override {
iwm_.flush();
drives_[0].set_rotation_speed(speed);
drives_[1].set_rotation_speed(speed);
}
forceinline void adjust_phase() {
++phase_;
}