60 lines
1.8 KiB
JavaScript
60 lines
1.8 KiB
JavaScript
"use strict";
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/*CRC16Modbus crc算法*/
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function calculateCRC16Modbus(dataHexString) {
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var dataBytes = [];
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for (var i = 0; i < dataHexString.length; i += 2) {
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dataBytes.push(parseInt(dataHexString.substr(i, 2), 16));
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}
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var crc = 0xFFFF;
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var polynomial = 0xA001; // This is the polynomial x^16 + x^15 + x^2 + 1
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var _iteratorNormalCompletion = true;
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var _didIteratorError = false;
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var _iteratorError = undefined;
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try {
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for (var _iterator = dataBytes[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
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var byte = _step.value;
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crc ^= byte;
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for (var _i = 0; _i < 8; _i++) {
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if (crc & 0x0001) {
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crc = (crc >> 1 ^ polynomial) & 0xFFFF;
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} else {
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crc >>= 1;
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}
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}
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}
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} catch (err) {
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_didIteratorError = true;
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_iteratorError = err;
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} finally {
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try {
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if (!_iteratorNormalCompletion && _iterator.return) {
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_iterator.return();
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}
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} finally {
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if (_didIteratorError) {
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throw _iteratorError;
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}
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}
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}
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return crc.toString(16).toUpperCase();
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}
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/*组装蜂鸣器控制报文*/
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function getControlCmd(status, time) {
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var cmd = "FE1003F6000204" + status + "0000" + time;
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var crc = calculateCRC16Modbus(cmd);
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return cmd + crc.substring(2, 4) + crc.substring(0, 2);
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}
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var lastMsg = '';
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/*发送控制消息到蓝牙*/
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function control(status, time) {
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var msg = "FFFF000D" + getControlCmd(status, time);
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msgList=[]
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// msgList.push(msg);
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execute(db, "INSERT INTO t_ble_msg (id,text) VALUES ("+new Date().getTime()+",'"+msg+"');", function (ret, err) {})
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}
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