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blinky.html
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<title>Web Blinky</title>
<body>
<div id="not-connected">
Not connected.
<button type="button" id="connect">Click to connect</button>
</div>
<div id="connected" style="display: none;">
Connected! <button type="button" id="toggle">Toggle the LED</button>
</div>
<script>
let device = null, on = false;
function setConnected(connected) {
document.getElementById("connected").style.display = connected ? "block" : "none";
document.getElementById("not-connected").style.display = connected ? "none" : "block";
}
document.getElementById("connect").onclick = async () => {
device = await navigator.usb.requestDevice({
filters: [{
vendorId: 0x16c0,
productId: 0x27d8,
}]
});
await device.open();
await device.selectConfiguration(1);
setConnected(true);
};
document.getElementById("toggle").onclick = async () => {
on = !on;
await device.controlTransferOut({
requestType: "vendor",
recipient: "device",
request: 1,
value: on ? 1 : 0,
index: 0
});
}
</script>
</body>