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With a history of three pulses, this can track up a 10% sine variation in a 1010101 stream. So I guess this'll do for now?

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This commit is contained in:
Thomas Harte 2016-07-14 19:54:48 -04:00
parent 6afd619791
commit 74817f6664
1 changed files with 19 additions and 0 deletions
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19
OSBindings/Mac/Clock SignalTests/DPLLTests.swift
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@ -39,4 +39,23 @@ class DPLLTests: XCTestCase {
let pll = DigitalPhaseLockedLoopBridge(clocksPerBit: 100, tolerance: 20, historyLength: 5)
testRegularNibblesOnPLL(pll, bitLength: 110)
}
func testTenPercentSinePattern() {
let pll = DigitalPhaseLockedLoopBridge(clocksPerBit: 100, tolerance: 20, historyLength: 3)
var angle = 0.0
// clock in two 1s, a 0, and a 1, 200 times over
for _ in 0 ..< 200 {
let bitLength: UInt = UInt(100 + 5 * sin(angle))
pll.runForCycles(bitLength/2)
pll.addPulse()
pll.runForCycles((bitLength*3)/2)
angle = angle + 0.1
}
let endOfStream = (pll.stream&0xffffff);
XCTAssert(endOfStream == 0xaaaaaa || endOfStream == 0x555555, "PLL should have synchronised and clocked repeating 0xa or 0x5 nibbles; got \(String(pll.stream, radix: 16, uppercase: false))")
}
}