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plurals
  1. PO
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    <p><code>rev16(crc16(0, buf, len))</code> will give you the CRCs listed.</p> <pre><code>#include &lt;stdio.h&gt; static unsigned short crc16_table[] = { 0x0000, 0xa001, 0xe003, 0x4002, 0x6007, 0xc006, 0x8004, 0x2005, 0xc00e, 0x600f, 0x200d, 0x800c, 0xa009, 0x0008, 0x400a, 0xe00b, 0x201d, 0x801c, 0xc01e, 0x601f, 0x401a, 0xe01b, 0xa019, 0x0018, 0xe013, 0x4012, 0x0010, 0xa011, 0x8014, 0x2015, 0x6017, 0xc016, 0x403a, 0xe03b, 0xa039, 0x0038, 0x203d, 0x803c, 0xc03e, 0x603f, 0x8034, 0x2035, 0x6037, 0xc036, 0xe033, 0x4032, 0x0030, 0xa031, 0x6027, 0xc026, 0x8024, 0x2025, 0x0020, 0xa021, 0xe023, 0x4022, 0xa029, 0x0028, 0x402a, 0xe02b, 0xc02e, 0x602f, 0x202d, 0x802c, 0x8074, 0x2075, 0x6077, 0xc076, 0xe073, 0x4072, 0x0070, 0xa071, 0x407a, 0xe07b, 0xa079, 0x0078, 0x207d, 0x807c, 0xc07e, 0x607f, 0xa069, 0x0068, 0x406a, 0xe06b, 0xc06e, 0x606f, 0x206d, 0x806c, 0x6067, 0xc066, 0x8064, 0x2065, 0x0060, 0xa061, 0xe063, 0x4062, 0xc04e, 0x604f, 0x204d, 0x804c, 0xa049, 0x0048, 0x404a, 0xe04b, 0x0040, 0xa041, 0xe043, 0x4042, 0x6047, 0xc046, 0x8044, 0x2045, 0xe053, 0x4052, 0x0050, 0xa051, 0x8054, 0x2055, 0x6057, 0xc056, 0x205d, 0x805c, 0xc05e, 0x605f, 0x405a, 0xe05b, 0xa059, 0x0058, 0xa0e9, 0x00e8, 0x40ea, 0xe0eb, 0xc0ee, 0x60ef, 0x20ed, 0x80ec, 0x60e7, 0xc0e6, 0x80e4, 0x20e5, 0x00e0, 0xa0e1, 0xe0e3, 0x40e2, 0x80f4, 0x20f5, 0x60f7, 0xc0f6, 0xe0f3, 0x40f2, 0x00f0, 0xa0f1, 0x40fa, 0xe0fb, 0xa0f9, 0x00f8, 0x20fd, 0x80fc, 0xc0fe, 0x60ff, 0xe0d3, 0x40d2, 0x00d0, 0xa0d1, 0x80d4, 0x20d5, 0x60d7, 0xc0d6, 0x20dd, 0x80dc, 0xc0de, 0x60df, 0x40da, 0xe0db, 0xa0d9, 0x00d8, 0xc0ce, 0x60cf, 0x20cd, 0x80cc, 0xa0c9, 0x00c8, 0x40ca, 0xe0cb, 0x00c0, 0xa0c1, 0xe0c3, 0x40c2, 0x60c7, 0xc0c6, 0x80c4, 0x20c5, 0x209d, 0x809c, 0xc09e, 0x609f, 0x409a, 0xe09b, 0xa099, 0x0098, 0xe093, 0x4092, 0x0090, 0xa091, 0x8094, 0x2095, 0x6097, 0xc096, 0x0080, 0xa081, 0xe083, 0x4082, 0x6087, 0xc086, 0x8084, 0x2085, 0xc08e, 0x608f, 0x208d, 0x808c, 0xa089, 0x0088, 0x408a, 0xe08b, 0x60a7, 0xc0a6, 0x80a4, 0x20a5, 0x00a0, 0xa0a1, 0xe0a3, 0x40a2, 0xa0a9, 0x00a8, 0x40aa, 0xe0ab, 0xc0ae, 0x60af, 0x20ad, 0x80ac, 0x40ba, 0xe0bb, 0xa0b9, 0x00b8, 0x20bd, 0x80bc, 0xc0be, 0x60bf, 0x80b4, 0x20b5, 0x60b7, 0xc0b6, 0xe0b3, 0x40b2, 0x00b0, 0xa0b1}; static unsigned char rev_table[] = { 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff}; unsigned crc16(unsigned crc, unsigned char *buf, int len) { while (len--) { crc ^= *buf++ &lt;&lt; 8; crc = (crc &lt;&lt; 8) ^ crc16_table[(crc &gt;&gt; 8) &amp; 0xff]; } return crc &amp; 0xffff; } inline unsigned rev16(unsigned val) { return (rev_table[val &amp; 0xff] &lt;&lt; 8) | rev_table[(val &gt;&gt; 8) &amp; 0xff]; } </code></pre>
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    1. POWhich CRC Alogrithim is this? How to improve?
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    1. PTAnswer
    1. USMark Adler
    1. USMark Adler
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POWhich CRC Alogrithim is this? How to improve?
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    1. VO
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      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
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      1. This table or related slice is empty.
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    3. VO
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    1. CONice work, Mark
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      1. USTonyK
    2. COThank you! I had at one point tried that A001 table but was thrown off by the final 16-bit reversion of the CRC. FYI, on a smallish sample telemetry file the processing time went from 1 minute to 1.5 seconds! Thanks again.
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      1. USAero Engy
 

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