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75 lines
1.7 KiB
Swift
75 lines
1.7 KiB
Swift
//
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// C1540Tests.swift
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// Clock Signal
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//
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// Created by Thomas Harte on 09/07/2016.
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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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class C1540Tests: XCTestCase {
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private func with1540(_ action: (C1540Bridge) -> ()) {
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let bridge = C1540Bridge()
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action(bridge)
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}
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private func transmit(_ c1540: C1540Bridge, value: Int) {
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var shiftedValue = value
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c1540.dataLine = true
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c1540.run(forCycles: 256)
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XCTAssertFalse(c1540.dataLine, "Listener should have taken data line low for start of transmission")
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c1540.clockLine = true
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c1540.run(forCycles: 256) // this isn't time limited on real hardware
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XCTAssertTrue(c1540.dataLine, "Listener should have let data line go high again")
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// set up for byte transfer
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c1540.clockLine = false
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c1540.dataLine = true
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c1540.run(forCycles: 40)
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// transmit bits
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for _ in 0..<8 {
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// load data line
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c1540.dataLine = (shiftedValue & 1) == 1
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shiftedValue >>= 1
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// toggle clock
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c1540.clockLine = true
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c1540.run(forCycles: 40)
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c1540.clockLine = false
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c1540.run(forCycles: 40)
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}
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// check for acknowledgment
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c1540.dataLine = true
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c1540.run(forCycles: 1000)
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XCTAssertFalse(c1540.dataLine, "Listener should have acknowledged byte")
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}
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// MARK: EOI
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func testTransmission() {
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with1540 {
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// allow some booting time
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$0.run(forCycles: 2000000)
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// I want to be talker, so hold attention and clock low with data high
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$0.clockLine = false
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$0.attentionLine = false
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$0.dataLine = true
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// proceed 1 ms and check that the 1540 pulled the data line low
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$0.run(forCycles: 1000)
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XCTAssertFalse($0.dataLine, "Listener should have taken data line low")
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// transmit LISTEN #8
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transmit($0, value: 0x28)
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}
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}
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}
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