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101 lines
2.9 KiB
Plaintext
101 lines
2.9 KiB
Plaintext
//
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// EnterpriseDaveTests.m
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// Clock SignalTests
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//
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// Created by Thomas Harte on 02/07/2021.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#import <XCTest/XCTest.h>
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#include "../../../Machines/Enterprise/Dave.hpp"
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#include <memory>
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@interface EnterpriseDaveTests : XCTestCase
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@end
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@implementation EnterpriseDaveTests {
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std::unique_ptr<Enterprise::Dave::TimedInterruptSource> _interruptSource;
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}
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- (void)setUp {
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[super setUp];
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_interruptSource = std::make_unique<Enterprise::Dave::TimedInterruptSource>();
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}
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- (void)performTestExpectedToggles:(int)expectedToggles expectedInterrupts:(int)expectedInterrupts {
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// Check that the programmable timer flag toggles at a rate
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// of 2kHz, causing 1000 interrupts, and that sequence points
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// are properly predicted.
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int toggles = 0;
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int interrupts = 0;
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uint8_t dividerState = _interruptSource->get_divider_state();
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int nextSequencePoint = _interruptSource->get_next_sequence_point().as<int>();
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for(int c = 0; c < 250000; c++) {
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// Advance one cycle. Clock is 250,000 Hz.
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_interruptSource->run_for(Cycles(1));
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const uint8_t newDividerState = _interruptSource->get_divider_state();
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if((dividerState^newDividerState)&0x1) {
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++toggles;
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}
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dividerState = newDividerState;
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--nextSequencePoint;
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// Check for the relevant interrupt.
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const uint8_t newInterrupts = _interruptSource->get_new_interrupts();
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if(newInterrupts & 0x02) {
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++interrupts;
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XCTAssertEqual(nextSequencePoint, 0);
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XCTAssertEqual(dividerState&0x1, 0);
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nextSequencePoint = _interruptSource->get_next_sequence_point().as<int>();
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}
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// Failing that, confirm that the other interrupt happend.
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if(!nextSequencePoint) {
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XCTAssertTrue(newInterrupts & 0x08);
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nextSequencePoint = _interruptSource->get_next_sequence_point().as<int>();
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}
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XCTAssertEqual(nextSequencePoint, _interruptSource->get_next_sequence_point().as<int>(), @"At cycle %d", c);
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}
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XCTAssertEqual(toggles, expectedToggles);
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XCTAssertEqual(interrupts, expectedInterrupts);
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}
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- (void)test1kHzTimer {
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// Set 1kHz timer.
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_interruptSource->write(7, 0 << 5);
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[self performTestExpectedToggles:2000 expectedInterrupts:1000];
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}
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- (void)test50HzTimer {
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// Set 50Hz timer.
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_interruptSource->write(7, 1 << 5);
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[self performTestExpectedToggles:100 expectedInterrupts:50];
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}
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- (void)testTone0Timer {
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// Set tone generator 0 as the interrupt source, with a divider of 137;
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// apply sync momentarily.
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_interruptSource->write(7, 2 << 5);
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_interruptSource->write(0, 137);
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_interruptSource->write(1, 0);
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[self performTestExpectedToggles:250000/138 expectedInterrupts:250000/(138*2)];
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}
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- (void)testTone1Timer {
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// Set tone generator 1 as the interrupt source, with a divider of 961;
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// apply sync momentarily.
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_interruptSource->write(7, 3 << 5);
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_interruptSource->write(2, 961 & 0xff);
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_interruptSource->write(3, (961 >> 8) & 0xff);
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[self performTestExpectedToggles:250000/961 expectedInterrupts:250000/(961*2)];
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}
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@end
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