javascript 如何使用 libusb 将数据发送到 node.js 中的 USB 设备
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How to send data to USB device in node.js using libusb
提问by Alex Skakun
I have try to get data from device (USB thermometer), following this docs https://www.npmjs.org/package/usb, but I have not any result.
我尝试按照此文档https://www.npmjs.org/package/usb从设备（USB 温度计）获取数据，但没有任何结果。
For getting themperature data from device, I should send the data like that 'd\n'.
为了从设备获取温度数据，我应该发送像“d\n”这样的数据。
This is my code:
这是我的代码：
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);
});
After running I have got this:
运行后我得到了这个：
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)
回答by user3621456
You forgot to call interface.claim().
您忘记调用 interface.claim()。
回答by Zenkylo
The interface should be declared using the term.interface(interfaceId)method, not term.interfaces[0]
接口应该使用term.interface(interfaceId)方法来声明，而不是term.interfaces[0]
回答by Bhoopesh Singh
Use sudo before running your command.
在运行命令之前使用 sudo。
Wrong:
错误的：
node index.js
Right:
对：
sudo node inex.js
