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sud.js
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sud.js
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module.exports = function(RED) {
var HID = require('node-hid');
function SUDConfigNode(n) {
RED.nodes.createNode(this, n);
this.vendor = n.vendor;
this.product = n.product;
this.serial = n.serial;
}
function readSUDnode(config) {
RED.nodes.createNode(this, config);
this.server = RED.nodes.getNode(config.connection);
try {
var device = new HID.HID(this.server.vendor, this.server.product);
this.status({
fill: "green",
shape: "dot",
text: "connected"
});
} catch (err) {
this.status({
fill: "red",
shape: "ring",
text: "disconnected"
});
}
var node = this;
device.on("data", function(data) {
var message = {
payload: ""
};
message.payload = data;
node.send([message, null]);
});
device.on("error", function(err) {
var message = {
payload: ""
};
message.payload = err;
node.send([null, message]);
});
this.on('input', function(msg) {
var data = toArray(msg.payload);
device.write(data);
});
this.on('close', function() {
device.close();
});
}
// function toArray(buffer) {
// var view = [];
// for (var i = 0; i < buffer.length; ++i) {
// view.push(buffer[i]);
// }
// return view;
// }
function writeSUDnode(config) {
RED.nodes.createNode(this, config);
var node = this;
this.on('input', function(msg) {
var devices = HID.devices();
msg.payload = devices;
node.send(msg);
});
}
RED.nodes.registerType("readSUD", readSUDnode);
RED.nodes.registerType("writeSUD", writeSUDnode);
RED.nodes.registerType('SUDConfig', SUDConfigNode);
}
/*
dev = usb.core.find(idVendor=9463, idProduct=8708)
if dev.is_kernel_driver_active(interface):
dev.detach_kernel_driver(interface)
dev.set_configuration()
usb.util.claim_interface(dev, interface)
configuration = dev.get_active_configuration()
interface = configuration[(0,0)]
epIn = usb.util.find_descriptor(interface, custom_match= lambda e: usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_IN)
epOut = usb.util.find_descriptor(interface, custom_match = lambda e: usb.util.endpoint_direction(e.bEndpointAddress) == usb.util.ENDPOINT_OUT)
assert epIn is not None
assert epOut is not None
rc=dev.write(epOut,"HELLOSUD")
ret=dev.read(epIn,epIn.wMaxPacketSize)
rc=dev.write(epOut,"READING")
ret=dev.read(epIn,epIn.wMaxPacketSize,1000)
ret=dev.read(epIn,epIn.wMaxPacketSize,10000)
c = BitArray(ret)
rc=dev.write(epOut,"BYESUD")
s={}
i=36
s['InWater']=p[i]
s['SlideNotFitted']=p[i+1]
s['SlideExpired']=p[i+2]
ph=p[80:96]
s['pH']=ph.uintle/100 # divided by 100
nh3=p[96:112]
s['NH3']=nh3.uintle/1000 # divided by 1000
temp=p[112:144]
s['Temp']=temp.intle/1000 # divided by 1000
*/