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103 lines
3.0 KiB
Plaintext
103 lines
3.0 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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/// Tests that the programmable timer flag toggles and produces interrupts
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/// at the rate specified, and that the flag toggles when interrupts are signalled.
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- (void)performTestExpectedInterrupts:(double)expectedInterruptsPerSecond mode:(int)mode {
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// If a programmable timer mode is requested, synchronise both channels.
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if(mode >= 2) {
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_interruptSource->write(0xa7, 3);
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_interruptSource->run_for(Cycles(2));
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}
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// Set mode (and disable sync, if it was applied).
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_interruptSource->write(0xa7, mode << 5);
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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() & 1;
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int nextSequencePoint = _interruptSource->next_sequence_point().as<int>();
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for(int c = 0; c < 250000 * 5; c++) {
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// Advance one cycle. Clock is 500,000 Hz.
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_interruptSource->run_for(Cycles(2));
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--nextSequencePoint;
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// Check for a status bit change.
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const uint8_t newDividerState = _interruptSource->get_divider_state();
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const bool didToggle = (dividerState^newDividerState)&0x1;
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dividerState = newDividerState;
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toggles += didToggle;
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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) {
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XCTAssertEqual(nextSequencePoint, 0);
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nextSequencePoint = _interruptSource->next_sequence_point().as<int>();
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if(newInterrupts & 0x02) {
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++interrupts;
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XCTAssertTrue(didToggle);
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} else {
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// Failing that, confirm that the other interrupt happend.
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XCTAssertTrue(newInterrupts & 0x08);
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}
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}
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XCTAssertEqual(nextSequencePoint, _interruptSource->next_sequence_point().as<int>(), @"At cycle %d", c);
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}
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XCTAssertEqual(toggles, int(expectedInterruptsPerSecond * 5.0));
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XCTAssertEqual(interrupts, int(expectedInterruptsPerSecond * 5.0));
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}
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- (void)test1kHzTimer {
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[self performTestExpectedInterrupts:1000.0 mode:0];
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}
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- (void)test50HzTimer {
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[self performTestExpectedInterrupts:50.0 mode:1];
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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(0, 137);
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_interruptSource->write(1, 0);
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[self performTestExpectedInterrupts:250000.0/(138.0 * 2.0) mode: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(2, 961 & 0xff);
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_interruptSource->write(3, (961 >> 8) & 0xff);
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[self performTestExpectedInterrupts:250000.0/(962.0 * 2.0) mode:3];
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}
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@end
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