java版CRC16算法，MODBUS 串口算法与x16+x12+x5+1公式计算

墨蓝 2022-12-25 08:56 162阅读 0赞

crc16验证工具 exe  
地址：[百度网盘地址][Link 1]  
提取码：fg8g

package com.zyd.data.netty.util;
    
    /** * CRC16算法 x16+x12+x5+1公式计算 *与 * crc16算法 MODBUS 串口算法 * * */
    public class CRC16 { 
    
        /** * java CRC16算法 x16+x12+x5+1公式计算 * * C语言函数 * * const unsigned short crc_ta[16]={0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,0x8108,0x9129, * * 0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef}; * * unsigned short Crc16_DATAs(unsigned char *ptr, unsigned short len) * * { * * unsigned char da; * * unsigned short CRC_16_Data = 0; * * while(len-- != 0) * * { * * da = CRC_16_Data >> 12; * * CRC_16_Data <<= 4; * * CRC_16_Data ^= crc_ta[da^(*ptr/16)]; * * da = CRC_16_Data >> 12; * * CRC_16_Data <<= 4; * * CRC_16_Data ^= crc_ta[da^(*ptr&0x0f)]; * * ptr++; * * } * * return CRC_16_Data; * * } * @param data_arr 数据数组 * @param data_len 数据长度 * @return */
        public static int[] getCrc16(byte[] data_arr, int data_len)
        { 
            int crc16 = 0;
            int i;
            for(i =0; i < (data_len); i++)
            { 
                crc16 = (char)(( crc16 >> 8) | (crc16 << 8));
                crc16 ^= data_arr[i]& 0xFF;
                crc16 ^= (char)(( crc16 & 0xFF) >> 4);
                crc16 ^= (char)(( crc16 << 8) << 4);
                crc16 ^= (char)((( crc16 & 0xFF) << 4) << 1);
            }
            int [] result=new int[2];
            result[0]= (crc16/256) ;
            result[1]= (crc16%256) ;
            return result;
        }
    
        /** * int数组转byte数组 * @param i int数组 * @return 返回byte数组 */
       public static byte[] intToByte(int[] i){ 
            byte[] bytes = new byte[2];
            for (int i1 = 0; i1 < i.length; i1++) { 
                bytes[i1]= (byte)i[i1];
            }
            return bytes;
        }
    
        /** * crc16算法 返回byte数组 * @param bytes * @return 返回byte数组 */
        public static byte[] crc16ByteArrey(byte[] bytes){ 
    
            return  intToByte(getCrc16(bytes, bytes.length));
        }
    
        /** * crc16算法 MODBUS 串口算法 * @param arr_buff * @return */
    
        public static byte[] getCrc16(byte[] arr_buff) { 
            int len = arr_buff.length;
            int crc = 0xFFFF;
            int i, j;
            for (i = 0; i < len; i++) { 
                crc = ((crc & 0xFF00) | (crc & 0x00FF) ^ (arr_buff[i] & 0xFF));
                for (j = 0; j < 8; j++) { 
                    if ((crc & 0x0001) > 0) { 
                        crc = crc >> 1;
                        crc = crc ^ 0xA001;
                    } else
                        crc = crc >> 1;
                }
            }
            return intToBytes(crc);
        }
    
        /** * int转byte数组 * @param value * @return */
        public static byte[] intToBytes(int value)  { 
            byte[] src = new byte[2];
            src[0] =  (byte) ((value>>8) & 0xFF);
            src[1] =  (byte) (value & 0xFF);
            return src;
        }
    
        public static void main(String str[]) { 
            byte[] s=  { (byte) 0xc1,0x02,0x00,0x08};
            byte[] bytes = crc16ByteArrey(s);
    
        }
    }

[Link 1]: https://pan.baidu.com/s/1oynUwNuoVkQ42D0QW4JaEA