问题
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.
For getting themperature data from device, I should send the data like that 'd\n'.
This is my code:
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:
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1:
You forgot to call interface.claim().
https://github.com/nonolith/node-usb#claim
回答2:
The interface should be declared using the term.interface(interfaceId)
method, not term.interfaces[0]
https://www.npmjs.com/package/usb#interfaceinterface
回答3:
Use sudo before running your command.
Wrong:
node index.js
Right:
sudo node inex.js
来源:https://stackoverflow.com/questions/22695614/how-to-send-data-to-usb-device-in-node-js-using-libusb