131 lines
3.2 KiB
JavaScript
131 lines
3.2 KiB
JavaScript
var CRC = {};
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CRC.CRC16 = function (data) {
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var len = data.length;
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if (len > 0) {
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var crc = 0xFFFF;
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for (var i = 0; i < len; i++) {
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crc = (crc ^ (data[i]));
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for (var j = 0; j < 8; j++) {
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crc = (crc & 1) != 0 ? ((crc >> 1) ^ 0xA001) : (crc >> 1);
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}
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}
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var hi = ((crc & 0xFF00) >> 8); //高位置
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var lo = (crc & 0x00FF); //低位置
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return [hi, lo];
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}
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return [0, 0];
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};
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CRC.isArray = function (arr) {
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return Object.prototype.toString.call(arr) === '[object Array]';
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};
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CRC.ToCRC16 = function (str, isReverse) {
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return CRC.toString(CRC.CRC16(CRC.isArray(str) ? str : CRC.strToByte(str)), isReverse);
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};
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CRC.ToModbusCRC16 = function (str, isReverse) {
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return CRC.toString(CRC.CRC16(CRC.isArray(str) ? str : CRC.strToHex(str)), isReverse);
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};
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CRC.strToByte = function (str) {
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var tmp = str.split(''), arr = [];
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for (var i = 0, c = tmp.length; i < c; i++) {
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var j = encodeURI(tmp[i]);
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if (j.length == 1) {
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arr.push(j.charCodeAt());
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} else {
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var b = j.split('%');
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for (var m = 1; m < b.length; m++) {
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arr.push(parseInt('0x' + b[m]));
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}
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}
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}
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return arr;
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};
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CRC.convertChinese = function (str) {
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if(str!=undefined){
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var tmp = str.split(''), arr = [];
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for (var i = 0, c = tmp.length; i < c; i++) {
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var s = tmp[i].charCodeAt();
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if (s <= 0 || s >= 127) {
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arr.push(s.toString(16));
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}
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else {
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arr.push(tmp[i]);
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}
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}
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return arr;
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}else{
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var arr = [];
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return arr;
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}
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};
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CRC.filterChinese = function (str) {
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var tmp = str.split(''), arr = [];
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for (var i = 0, c = tmp.length; i < c; i++) {
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var s = tmp[i].charCodeAt();
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if (s > 0 && s < 127) {
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arr.push(tmp[i]);
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}
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}
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return arr;
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};
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CRC.strToHex = function (hex, isFilterChinese) {
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hex = isFilterChinese ? CRC.filterChinese(hex).join('') : CRC.convertChinese(hex).join('');
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//清除所有空格
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hex = hex.replace(/\s/g, "");
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//若字符个数为奇数，补一个0
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hex += hex.length % 2 != 0 ? "0" : "";
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var c = hex.length / 2, arr = [];
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for (var i = 0; i < c; i++) {
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arr.push(parseInt(hex.substr(i * 2, 2), 16));
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}
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return arr;
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};
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CRC.padLeft = function (s, w, pc) {
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if (pc == undefined) {
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pc = '0';
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}
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for (var i = 0, c = w - s.length; i < c; i++) {
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s = pc + s;
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}
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return s;
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};
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CRC.toString = function (arr, isReverse) {
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if (typeof isReverse == 'undefined') {
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isReverse = true;
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}
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var hi = arr[0], lo = arr[1];
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return CRC.padLeft((isReverse ? hi + lo * 0x100 : hi * 0x100 + lo).toString(16).toUpperCase(), 4, '0');
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};
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//CRC中间加空格
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function CRCdata(Cr){
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var str = CRC.ToModbusCRC16(Cr, false).toUpperCase();
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var s = '';
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for(var i=0;i<str.length;i++){
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if(i==2){
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s+=' ';
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}
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s += str[i];
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}
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CRCdate = s;
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return s;
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}
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// console.log(CRC.ToModbusCRC16('00 07 11 00 00 00 00 00 00', false).toUpperCase());
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// console.log(toHex(4568).toUpperCase());
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