Created
February 24, 2020 22:17
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webserial connect
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<title>Parcel Sandbox</title> | |
<meta charset="UTF-8" /> | |
</head> | |
<body> | |
<button id="portSelect" type="button">Select a port</button> | |
<div id="connectionInfoDisplay">Connection Information</div> | |
<button id="disconnectButton" type="button">Disconnect</button> | |
<script> | |
let serialSettings = { | |
bitrate: 115200, | |
dataBits: "eight", | |
parityBit: "no", | |
stopBits: "one", | |
ctsFlowControl: false | |
}; | |
function start() { | |
var portSelect = document.getElementById("portSelect"); | |
portSelect.addEventListener("click", async e => { | |
e.preventDefault(); | |
console.log("Selecting port"); | |
// Request a port/device from user | |
const port = await navigator.serial.requestPort(); | |
// Open and begin reading. | |
await port.open({ | |
baudrate: 115200 | |
}); | |
const reader = port.in.getReader(); | |
while (true) { | |
const { done, data } = await reader.read(); | |
if (done) break; | |
console.log(data); | |
} | |
}); | |
document.getElementById("disconnectButton").addEventListener("click", e => { | |
e.preventDefault(); | |
console.log("Clicked disconnect"); | |
}); | |
navigator.serial.getPorts(function(devices) { | |
buildPortSelect(devices); | |
openSelectedPort(); | |
}); | |
} | |
//Leaving out buildPortSelect for brevity | |
function openSelectedPort() { | |
let portSelect = document.getElementById("portSelect"); | |
let selectedPort = portSelect.options[portSelect.selectedIndex].value; | |
let connectionInfoDisplay = document.getElementById("connectionInfoDisplay"); | |
for (let i = 0; i < state.eligiblePorts.length; i++) { | |
if (selectedPort == state.eligiblePorts[i].path) { | |
connectionInfoDisplay.innerText = "Connected to: " + selectedPort; | |
navigator.serial.connect(selectedPort, serialSettings, onConnect); | |
break; | |
} | |
} | |
} | |
const onConnect = function(connectionInfo) { | |
// The serial port has been opened. Save its id to use later. | |
connectionId = connectionInfo.connectionId; | |
}; | |
start(); | |
</script> | |
</body> | |
</html> |
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