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我試圖從設備(USB溫度計)獲取數據,按照這個文檔https://www.npmjs.org/package/usb,但我沒有任何結果。如何使用libusb發送數據到node.js中的USB設備
爲了從設備獲取溫度數據,我應該發送像'd \ n'這樣的數據。
這是我的代碼:
var usb = require('usb'),
term = usb.findByIds(65535, 2);
term.open();
var endpoints = term.interfaces[0].endpoints,
inEndpoint = endpoints[0],
outEndpoint = endpoints[1];
inEndpoint.transferType = 2;
inEndpoint.startStream(1, 64);
inEndpoint.transfer(64, function (error, data) {
if (!error) {
console.log(data);
} else {
console.log(error);
}
});
inEndpoint.on('data', function (data) {
console.log(data);
});
inEndpoint.on('error', function (error) {
console.log(error);
});
outEndpoint.transferType = 2;
outEndpoint.startStream(1, 64);
outEndpoint.transfer(new Buffer('d\n'), function (err) {
console.log(err);
});
運行我有這個後:
D:\Dev\USBTest\node_modules\usb\usb.js:261
t.submit(new Buffer(self.streamTransferSize), transferDone)
^
Error: LIBUSB_ERROR_NOT_FOUND
at startTransfer (D:\Dev\USBTest\node_modules\usb\usb.js:261:5)
at Array.forEach (native)
at InEndpoint.startStream (D:\Dev\USBTest\node_modules\usb\usb.js:264:23)
at D:\Dev\USBTest\app.js:15:16
at Object.<anonymous> (D:\Dev\USBTest\app.js:35:2)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)