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serial.js
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serial.js
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const SerialPort = require('serialport');
function findSerialName(vendorId) {
return SerialPort.list()
.then((ports) => {
console.log(ports);
for (const port of ports) {
if (port.vendorId === vendorId) {
return port;
}
}
throw `No port with vendorId ${vendorId}`;
}).then(port => port.comName);
}
function handlePortEvents(port, readcb, errorcb) {
port.open(function (err) {
if (err) {
return errorcb('Error opening port: ', err.message)
}
})
port.on('readable', function () {
readcb(port, port.read().toString().trim().toLowerCase());
});
// Open errors will be emitted as an error event
port.on('error', function(err) {
errorcb(err, port);
});
return port;
}
function openSerialPort(vendorId, readcb, errorcb) {
return findSerialName(vendorId)
.then((portName) => {
return new SerialPort(portName, {
baudRate: 57600,
autoOpen: false
});
}).then((port) => {
return handlePortEvents(port, readcb, errorcb)
});
}
exports.openSerialPort = openSerialPort;
function sendMessage(port, message) {
return new Promise((resolve, reject) => {
if (typeof message !== 'string') {
message = String(message);
}
port.write(message, function(err) {
if (err) {
reject(err);
return;
}
resolve('message written');
})
});
}
exports.sendMessage = sendMessage;