uniapp 微信小程序蓝牙业务

最新推荐文章于 2025-09-29 20:30:03 发布

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最新推荐文章于 2025-09-29 20:30:03 发布 · 1k 阅读

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本文详细介绍了如何使用uniapp框架，结合微信小程序的蓝牙API，实现蓝牙设备的搜索、连接和数据交换功能，为物联网应用开发提供便利。

//CRC蓝牙校验
var crc16 = function(buffer) {
   
   
	var crc = 0x0000;
	var odd;
	for (var i = 0; i < buffer.length; i++) {
   
   
		crc ^= (buffer[i] << 8)
		for (var j = 0; j < 8; j++) {
   
   
			odd = crc & 0x8000;
			crc = crc << 1;
			if (odd) {
   
   
				crc = crc ^ 0x1021
			}
		}
	}
	var hi = ((crc & 0xFF00) >> 8); //高位置
	var lo = (crc & 0x00FF); //低位置
	var crcArr = []
	crcArr.push(hi)
	crcArr.push(lo)
	crc &= 0xFFFF
	return crcToString(crcArr, true)
};

//转为大写String
function crcToString(arr, isReverse) {
   
   
	if (typeof isReverse == 'undefined') {
   
   
		isReverse = true;
	}
	var hi = arr[0],
		lo = arr[1];
	return padLeft((isReverse ? hi + lo * 0x100 : hi * 0x100 + lo).toString(16).toUpperCase(), 4, '0');
};

var padLeft = function(s, w, pc) {
   
   
	if (pc == undefined) {
   
   
		pc = '0';
	}
	for (var i = 0, c = w - s.length; i < c; i++) {
   
   
		s = pc + s;
	}
	return s;
};

//十六进制字符串转字节数组
function hexString2Bytes(str) {
   
   
	var pos = 0;
	var len = str.length;
	if (len % 2 != 0) {
   
   
		return null;
	}
	len /= 2;
	var arrBytes = new Array();
	for (var i = 0; i < len; i++) {
   
   
		var s = str.substr(pos, 2);
		var v = parseInt(s, 16);
		arrBytes.push(v);
		pos += 2;
	}
	return arrBytes;
}

function buf2hex(buffer) {
   
   
	return Array.prototype.map.call(new Uint8Array(buffer), x => ('00' + x.toString(16)).slice(-2)).join('')
}

function buf2string(buffer) {
   
   
	var arr = Array.prototype.map.call(new Uint8Array(buffer), x => x)
	var str = ''
	for (var i = 0; i < arr.length; i++) {
   
   
		str += String.fromCharCode(arr[i])
	}
	return str
}

//字符串转ArrayBuffer
function hexStringToArrayBuffer(str) {
   
   
	if (!str) {
   
   
		return new ArrayBuffer(0);
	}
	var buffer = new ArrayBuffer(20);
	let dataView = new DataView(buffer)
	let ind = 0;
	for (var i = 0; i < str.length; i += 2) {
   
   
		let code = parseInt(str.substr(i, 2), 16)
		dataView.setUint8(ind, code

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