ngx-serial
Version:
NgxSerial eases the use of the Serial Web API in Angular.
103 lines • 12.9 kB
JavaScript
import { __awaiter } from "tslib";
export class NgxSerial {
constructor(readFunction, options, controlCharacter) {
this.options = { baudRate: 9600, dataBits: 8, parity: 'none', bufferSize: 256, flowControl: 'none' }; //Default
this.controlCharacter = "\n";
this.keepReading = true;
this.readFunction = readFunction;
if (options)
this.options = options;
if (controlCharacter)
this.controlCharacter = controlCharacter;
}
sendData(data) {
return __awaiter(this, void 0, void 0, function* () {
yield this.writer.write(data);
});
}
readLoop() {
return __awaiter(this, void 0, void 0, function* () {
while (this.port.readable && this.keepReading) {
const textDecoder = new TextDecoderStream();
this.readableStreamClosed = this.port.readable.pipeTo(textDecoder.writable);
this.reader = textDecoder.readable
.pipeThrough(new TransformStream(new LineBreakTransformer(this.controlCharacter)))
.getReader();
try {
while (true) {
const { value, done } = yield this.reader.read();
if (done) {
break;
}
if (value) {
this.readFunction(value);
}
}
}
catch (error) {
console.error("Read Loop error. Have the serial device been disconnected ? ");
}
}
});
}
close(callback) {
return __awaiter(this, void 0, void 0, function* () {
this.keepReading = false;
this.reader.cancel();
yield this.readableStreamClosed.catch(() => { });
this.writer.close();
yield this.writableStreamClosed;
yield this.port.close();
callback(null);
});
}
connect(callback) {
return __awaiter(this, void 0, void 0, function* () {
this.keepReading = true;
if ("serial" in navigator) {
// The Web Serial API is supported by the browser.
let nav = navigator;
const ports = yield nav.serial.getPorts();
try {
this.port = yield nav.serial.requestPort();
}
catch (error) {
console.error("Requesting port error: " + error);
return;
}
try {
yield this.port.open(this.options);
}
catch (error) {
console.error("Opening port error: " + error);
return;
}
const textEncoder = new TextEncoderStream();
this.writableStreamClosed = textEncoder.readable.pipeTo(this.port.writable);
this.writer = textEncoder.writable.getWriter();
this.readLoop();
callback(this.port);
}
else {
console.error("This browser does NOT support the Web Serial API");
}
});
}
}
class LineBreakTransformer {
constructor(controlCharacter) {
this.container = "";
this.container = '';
this.controlCharacter = controlCharacter;
}
transform(chunk, controller) {
this.container += chunk;
const lines = this.container.split(this.controlCharacter);
this.container = lines.pop();
lines.forEach((line) => controller.enqueue(line));
}
flush(controller) {
controller.enqueue(this.container);
}
}
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Have the serial device been disconnected ? \");\n        }\n      }\n    }\n    public async close(callback:Function) {\n      this.keepReading = false;\n      this.reader.cancel();\n      await this.readableStreamClosed.catch(() => {});\n      this.writer.close();\n      await this.writableStreamClosed;\n      await this.port.close();\n      callback(null);\n    }\n  \n    public async connect(callback:Function) {\n      this.keepReading = true;\n      if (\"serial\" in navigator) {\n        // The Web Serial API is supported by the browser.\n        let nav: any = navigator;\n        const ports = await nav.serial.getPorts();\n  \n        try {\n          this.port = await nav.serial.requestPort();\n  \n        } catch (error) {\n          console.error(\"Requesting port error: \" + error);\n          return;\n        }\n  \n        try {\n         await this.port.open(this.options);\n  \n  \n        } catch (error) {\n          console.error(\"Opening port error: \" + error);\n          return;\n        }\n  \n        const textEncoder = new TextEncoderStream();\n        this.writableStreamClosed = textEncoder.readable.pipeTo(this.port.writable);\n        this.writer = textEncoder.writable.getWriter();\n  \n        this.readLoop();\n  \n        callback(this.port);\n  \n      } else {\n        console.error(\"This browser does NOT support the Web Serial API\");\n      }\n  \n    }\n  }\n  \n  class LineBreakTransformer {\n    container: any=\"\";\n    private controlCharacter: string;\n  \n    constructor(controlCharacter: string) {\n      this.container = '';\n      this.controlCharacter = controlCharacter\n    }\n  \n    transform(chunk:any, controller:any) {\n      this.container += chunk;\n      const lines = this.container.split(this.controlCharacter);\n      this.container = lines.pop();\n      lines.forEach((line: any) => controller.enqueue(line));\n    }\n  \n    flush(controller:any) {\n      controller.enqueue(this.container);\n    }\n  }"]}