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129 lines
4.3 KiB
Swift
129 lines
4.3 KiB
Swift
//
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// 6522Tests.swift
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// Clock Signal
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//
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// Created by Thomas Harte on 18/06/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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import XCTest
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import Foundation
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class MOS6522Tests: XCTestCase {
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fileprivate func with6522(_ action: (MOS6522Bridge) -> ()) {
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let bridge = MOS6522Bridge()
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action(bridge)
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}
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// MARK: Timer tests
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func testTimerCount() {
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with6522 {
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// set timer 1 to a value of $000a
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$0.setValue(10, forRegister: 4)
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$0.setValue(0, forRegister: 5)
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// complete the setting cycle
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$0.run(forHalfCycles: 2)
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// run for 5 cycles
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$0.run(forHalfCycles: 10)
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// check that the timer has gone down by 5
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XCTAssert($0.value(forRegister: 4) == 5, "Low order byte should be 5; was \($0.value(forRegister: 4))")
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XCTAssert($0.value(forRegister: 5) == 0, "High order byte should be 0; was \($0.value(forRegister: 5))")
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}
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}
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func testTimerLatches() {
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with6522 {
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// set timer 2 to $1020
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$0.setValue(0x10, forRegister: 8)
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$0.setValue(0x20, forRegister: 9)
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// change the low-byte latch
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$0.setValue(0x40, forRegister: 8)
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// complete the cycle
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$0.run(forHalfCycles: 2)
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// chek that the new latched value hasn't been copied
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XCTAssert($0.value(forRegister: 8) == 0x10, "Low order byte should be 0x10; was \($0.value(forRegister: 8))")
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XCTAssert($0.value(forRegister: 9) == 0x20, "High order byte should be 0x20; was \($0.value(forRegister: 9))")
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// write the low-byte latch
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$0.setValue(0x50, forRegister: 9)
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// complete the cycle
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$0.run(forHalfCycles: 2)
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// chek that the latched value has been copied
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XCTAssert($0.value(forRegister: 8) == 0x40, "Low order byte should be 0x50; was \($0.value(forRegister: 8))")
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XCTAssert($0.value(forRegister: 9) == 0x50, "High order byte should be 0x40; was \($0.value(forRegister: 9))")
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}
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}
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func testTimerReload() {
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with6522 {
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// set timer 1 to a value of $0010, enable repeating mode
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$0.setValue(16, forRegister: 4)
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$0.setValue(0, forRegister: 5)
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$0.setValue(0x40, forRegister: 11)
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$0.setValue(0x40 | 0x80, forRegister: 14)
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// complete the cycle to set initial values
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$0.run(forHalfCycles: 2)
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// run for 16 cycles
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$0.run(forHalfCycles: 32)
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// check that the timer has gone down to 0 but not yet triggered an interrupt
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XCTAssert($0.value(forRegister: 4) == 0, "Low order byte should be 0; was \($0.value(forRegister: 4))")
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XCTAssert($0.value(forRegister: 5) == 0, "High order byte should be 0; was \($0.value(forRegister: 5))")
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XCTAssert(!$0.irqLine, "IRQ should not yet be active")
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// check that two half-cycles later the timer is $ffff but IRQ still hasn't triggered
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$0.run(forHalfCycles: 2)
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XCTAssert($0.value(forRegister: 4) == 0xff, "Low order byte should be 0xff; was \($0.value(forRegister: 4))")
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XCTAssert($0.value(forRegister: 5) == 0xff, "High order byte should be 0xff; was \($0.value(forRegister: 5))")
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XCTAssert(!$0.irqLine, "IRQ should not yet be active")
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// check that one half-cycle later the timer is still $ffff and IRQ has triggered...
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$0.run(forHalfCycles: 1)
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XCTAssert($0.irqLine, "IRQ should be active")
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XCTAssert($0.value(forRegister: 4) == 0xff, "Low order byte should be 0xff; was \($0.value(forRegister: 4))")
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XCTAssert($0.value(forRegister: 5) == 0xff, "High order byte should be 0xff; was \($0.value(forRegister: 5))")
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// ... but that reading the timer cleared the interrupt
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XCTAssert(!$0.irqLine, "IRQ should be active")
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// check that one half-cycles later the timer has reloaded
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$0.run(forHalfCycles: 1)
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XCTAssert($0.value(forRegister: 4) == 0x10, "Low order byte should be 0x10; was \($0.value(forRegister: 4))")
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XCTAssert($0.value(forRegister: 5) == 0x00, "High order byte should be 0x00; was \($0.value(forRegister: 5))")
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}
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}
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// MARK: Data direction tests
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func testDataDirection() {
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with6522 {
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// set low four bits of register B as output, the top four as input
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$0.setValue(0xf0, forRegister: 2)
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// ask to output 0x8c
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$0.setValue(0x8c, forRegister: 0)
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// complete the cycle
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$0.run(forHalfCycles: 2)
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// set current input as 0xda
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$0.portBInput = 0xda
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// test that the result of reading register B is therefore 0x8a
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XCTAssert($0.value(forRegister: 0) == 0x8a, "Data direction register should mix input and output; got \($0.value(forRegister: 0))")
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}
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}
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}
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