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62 lines
1.7 KiB
Swift
62 lines
1.7 KiB
Swift
//
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// DPLLTests.swift
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// Clock Signal
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//
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// Created by Thomas Harte on 12/07/2016.
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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 DPLLTests: XCTestCase {
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func testRegularNibblesOnPLL(_ pll: DigitalPhaseLockedLoopBridge, bitLength: UInt) {
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// clock in two 1s, a 0, and a 1, 200 times over
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for _ in 0 ..< 200 {
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pll.run(forCycles: bitLength/2)
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pll.addPulse()
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pll.run(forCycles: bitLength)
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pll.addPulse()
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pll.run(forCycles: bitLength*2)
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pll.addPulse()
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pll.run(forCycles: bitLength/2)
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}
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XCTAssert((pll.stream&0xffffffff) == 0xdddddddd, "PLL should have synchronised and clocked repeating 0xd nibbles; got \(String(pll.stream, radix: 16, uppercase: false))")
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}
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func testPerfectInput() {
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let pll = DigitalPhaseLockedLoopBridge(clocksPerBit: 100)
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testRegularNibblesOnPLL(pll!, bitLength: 100)
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}
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func testFastButRegular() {
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let pll = DigitalPhaseLockedLoopBridge(clocksPerBit: 100)
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testRegularNibblesOnPLL(pll!, bitLength: 90)
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}
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func testSlowButRegular() {
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let pll = DigitalPhaseLockedLoopBridge(clocksPerBit: 100)
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testRegularNibblesOnPLL(pll!, bitLength: 110)
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}
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func testTwentyPercentSinePattern() {
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let pll = DigitalPhaseLockedLoopBridge(clocksPerBit: 100)
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var angle = 0.0
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// clock in two 1s, a 0, and a 1, 200 times over
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for _ in 0 ..< 200 {
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let bitLength: UInt = UInt(100 + 20 * sin(angle))
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pll?.run(forCycles: bitLength/2)
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pll?.addPulse()
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pll?.run(forCycles: (bitLength*3)/2)
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angle = angle + 0.1
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}
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let endOfStream = (pll?.stream)!&0xffffffff;
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XCTAssert(endOfStream == 0xaaaaaaaa || endOfStream == 0x55555555, "PLL should have synchronised and clocked repeating 0xa or 0x5 nibbles; got \(String(pll!.stream, radix: 16, uppercase: false))")
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}
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}
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