package com.sandu.ximon.admin.manager.iot.rrpc.util;

public class CRCUtils {
    /**
     * 计算CRC16/Modbus校验码  高位在前,低位在后
     *
     * @param hex 十六进制字符串
     * @return CRC16校验码
     */
    public static String getCRC16 (String hex) {
        byte[] tx_buff = SupplementUtils.hexStringToBytes(hex);
        int[] result = CRCValidate.calculateCRC(tx_buff, 0, tx_buff.length);
        String hex1 = Integer.toHexString(result[1]);
        String hex2 = Integer.toHexString(result[0]);

        if (hex1.length()<2) {
            hex1 = "0" + hex1;
        }
        if (hex2.length()<2) {
            hex2 = "0" + hex2;
        }
        return ( hex2 + hex1 ).toUpperCase();
    }
}