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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/common.js"></script>
<script src="resources/manual.js"></script>
</head>
<body>
<p>
These tests require a connected serial device configured to act as a
"loopback" device, with the transmit and receive pins wired together.
</p>
<script>
manual_serial_test(async (t, port) => {
await port.open({baudRate: 115200, bufferSize: 1024});
let reader = port.readable.getReader();
let readPromise = (async () => {
// A single zero byte will be read before the break is detected.
const {value, done} = await reader.read();
compareArrays(value, new Uint8Array([0]));
assert_false(done);
try {
const {value, done} = await reader.read();
assert_unreached(`Expected break, got ${value.byteLength} bytes`);
} catch (e) {
assert_equals(e.constructor, DOMException);
assert_equals(e.name, 'BreakError');
}
})();
await port.setSignals({break: true});
await readPromise;
await port.setSignals({break: false});
const writer = port.writable.getWriter();
// |data| is small enough to be completely transmitted.
let data = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
await writer.write(data);
writer.releaseLock();
reader = port.readable.getReader();
const buffer = await readWithLength(reader, data.byteLength);;
compareArrays(buffer, data);
reader.releaseLock();
await port.close();
}, 'Break is detected.');
</script>
</body>
</html>
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