<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>GPIO-HBridge</title>
<script src="https://r.chirimen.org/polyfill.js"></script>
</head>
<body>
<h1>GPIO H-Bridge Motor drive (no PWM)</h1>
<!-- http://www.kaltpost.de/?page_id=12 -->
<p>Connect H-Bridge Motor Driver to GPIO 20,21</p>
<input type="button" onclick="free()" value="FREE"></input>
<input type="button" onclick="fwd()" value="FOWARD"></input>
<input type="button" onclick="rev()" value="REVERSE"></input>
<input type="button" onclick="brake()" value="BRAKE"></input>
<div>
<table>
</body>
</html>
// noprotect
// Hブリッジモータードライバは正転[1,0]・逆転[0,1]・ブレーキ[1,1]・フリー[0,0]の4状態を
// GPIOの2つの信号線を使って指示します
var portAddrs = [20,21]; // HブリッジコントローラをつなぐGPIOポート番号
var portPromise;
onload =async function(){ // ポートを初期化するための非同期関数
console.log("onload");
var gpioAccess = await navigator.requestGPIOAccess(); // thenの前の関数をawait接頭辞をつけて呼び出します。
var ports = [];
for ( var i = 0 ; i < 2 ; i++ ){
ports[i] = gpioAccess.ports.get(portAddrs[i]);
await ports[i].export("out");
}
for ( var i = 0 ; i < 2 ; i++ ){
ports[i].write(0);
}
portPromise = ports;
}
async function free(){
var ports = await portPromise;
ports[0].write(0);
ports[1].write(0);
}
async function brake(){
var ports = await portPromise;
ports[0].write(1);
ports[1].write(1);
await sleep(300); // 300ms待機してフリー状態にします
ports[0].write(0);
ports[1].write(0);
}
async function fwd(){
var ports = await portPromise;
ports[0].write(1);
ports[1].write(0);
}
async function rev(){
var ports = await portPromise;
ports[0].write(0);
ports[1].write(1);
}
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