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Got back to a failing test, now while trying to transmit a whole byte. Good stuff!

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This commit is contained in:
Thomas Harte 2016-07-09 17:39:51 -04:00
parent 66caa3c6dc
commit 3560babd7e
1 changed files with 35 additions and 2 deletions
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37
OSBindings/Mac/Clock SignalTests/C1540Tests.swift
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@ -21,6 +21,34 @@ class C1540Tests: XCTestCase {
action(bridge)
}
private func transmit(c1540: C1540Bridge, value: Int) {
var shiftedValue = value
for _ in 1..<8 {
// load data line
c1540.dataLine = (shiftedValue & 1) == 1
shiftedValue >>= 1
// toggle clock
c1540.clockLine = false
c1540.runForCycles(40)
c1540.clockLine = true
c1540.runForCycles(40)
// wait up to 70 µs for an acknowledge
var cyclesWaited = 0
while c1540.clockLine == true && cyclesWaited < 140 {
c1540.runForCycles(1)
cyclesWaited = cyclesWaited + 1
}
XCTAssert(c1540.clockLine == false, "Listener should have started to acknowledge bit")
while c1540.clockLine == false && cyclesWaited < 140 {
c1540.runForCycles(1)
cyclesWaited = cyclesWaited + 1
}
XCTAssert(c1540.clockLine == true, "Listener should have completed acknowledging bit")
}
}
// MARK: EOI
func testTransmission() {
@ -28,12 +56,17 @@ class C1540Tests: XCTestCase {
// allow some booting time
$0.runForCycles(2000000)
// I want to be talker, so hold attention and clock low
// I want to be talker, so hold attention and clock low with data high
$0.clockLine = false
$0.attentionLine = false
$0.runForCycles(200)
$0.dataLine = true
// proceed 1 ms and check that the 1540 pulled the data line low
$0.runForCycles(2000)
XCTAssert($0.dataLine == false, "Listener should have taken data line low")
// transmit LISTEN #8
self.transmit($0, value: 0x28)
}
}
}