| <!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_loopback_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> |