1 /* ----------------------------------------------------------------------------
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2 * SAM Software Package License
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3 * ----------------------------------------------------------------------------
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4 * Copyright (c) 2015, Atmel Corporation
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6 * All rights reserved.
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions are met:
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11 * - Redistributions of source code must retain the above copyright notice,
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12 * this list of conditions and the disclaimer below.
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14 * Atmel's name may not be used to endorse or promote products derived from
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15 * this software without specific prior written permission.
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17 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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20 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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23 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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26 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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27 * ----------------------------------------------------------------------------
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30 /*----------------------------------------------------------------------------
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32 *----------------------------------------------------------------------------*/
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39 /*------------------------------------------------------------------------------
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41 *----------------------------------------------------------------------------*/
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45 //------------------------------------------------------------------------------
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47 //------------------------------------------------------------------------------
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49 //------------------------------------------------------------------------------
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50 // Calculate the CRC8 of the byte value provided with the current
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51 // global 'crc8' value.
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52 // Returns current global crc8 value
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53 //------------------------------------------------------------------------------
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55 static const uint8_t dscrc_table[] =
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57 0, 94,188,226, 97, 63,221,131,194,156,126, 32,163,253, 31, 65,
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58 157,195, 33,127,252,162, 64, 30, 95, 1,227,189, 62, 96,130,220,
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59 35,125,159,193, 66, 28,254,160,225,191, 93, 3,128,222, 60, 98,
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60 190,224, 2, 92,223,129, 99, 61,124, 34,192,158, 29, 67,161,255,
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61 70, 24,250,164, 39,121,155,197,132,218, 56,102,229,187, 89, 7,
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62 219,133,103, 57,186,228, 6, 88, 25, 71,165,251,120, 38,196,154,
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63 101, 59,217,135, 4, 90,184,230,167,249, 27, 69,198,152,122, 36,
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64 248,166, 68, 26,153,199, 37,123, 58,100,134,216, 91, 5,231,185,
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65 140,210, 48,110,237,179, 81, 15, 78, 16,242,172, 47,113,147,205,
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66 17, 79,173,243,112, 46,204,146,211,141,111, 49,178,236, 14, 80,
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67 175,241, 19, 77,206,144,114, 44,109, 51,209,143, 12, 82,176,238,
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68 50,108,142,208, 83, 13,239,177,240,174, 76, 18,145,207, 45,115,
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69 202,148,118, 40,171,245, 23, 73, 8, 86,180,234,105, 55,213,139,
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70 87, 9,235,181, 54,104,138,212,149,203, 41,119,244,170, 72, 22,
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71 233,183, 85, 11,136,214, 52,106, 43,117,151,201, 74, 20,246,168,
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72 116, 42,200,150, 21, 75,169,247,182,232, 10, 84,215,137,107, 53};
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74 static uint8_t _do_crc8 (uint8_t value)
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76 return dscrc_table[Crc8 ^ value];
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79 //------------------------------------------------------------------------------
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80 //------------------------------------------------------------------------------
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82 uint8_t compute_crc8 (uint8_t* pData, uint8_t Length)
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87 Crc8 = _do_crc8( *pData);
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