108 lines
3.2 KiB
C
108 lines
3.2 KiB
C
/* This file is a modified version of the output of pycrc.
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*
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* Licensing terms of pycrc:
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*
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* Copyright (c) 2006-2007, Thomas Pircher <tehpeh@gmx.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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*
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* crc7.c: Calculate CRC7 for SD card commands
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*
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*/
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/*
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* Functions and types for CRC checks.
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*
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* Generated on Thu Nov 8 13:52:05 2007,
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* by pycrc v0.6.3, http://www.tty1.net/pycrc/
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* using the configuration:
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* Width = 7
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* Poly = 0x09
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* XorIn = 0x00
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* ReflectIn = False
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* XorOut = 0x00
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* ReflectOut = False
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* Algorithm = bit-by-bit-fast
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdbool.h>
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/**
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; MMC/SD CRC Polynom X^7 + X^3 + 1
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crc7taba:
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mov dptr,#CRC7_TABA ; (2)
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clr c ; (1)
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rrc a ; (1)
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xrl a,crc7ta ; (1)
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movc a,@a+dptr ; (2)
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jnc crc7m ; (2)
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xrl a,#00001001b ; (1)
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crc7m: mov crc7ta,a ; (1)
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ret ; (2) (LCALL=2)
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*/
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uint8_t crc7tab[128] = {
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0x00,0x12,0x24,0x36,0x48,0x5a,0x6c,0x7e,
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0x19,0x0b,0x3d,0x2f,0x51,0x43,0x75,0x67,
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0x32,0x20,0x16,0x04,0x7a,0x68,0x5e,0x4c,
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0x2b,0x39,0x0f,0x1d,0x63,0x71,0x47,0x55,
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0x64,0x76,0x40,0x52,0x2c,0x3e,0x08,0x1a,
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0x7d,0x6f,0x59,0x4b,0x35,0x27,0x11,0x03,
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0x56,0x44,0x72,0x60,0x1e,0x0c,0x3a,0x28,
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0x4f,0x5d,0x6b,0x79,0x07,0x15,0x23,0x31,
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0x41,0x53,0x65,0x77,0x09,0x1b,0x2d,0x3f,
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0x58,0x4a,0x7c,0x6e,0x10,0x02,0x34,0x26,
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0x73,0x61,0x57,0x45,0x3b,0x29,0x1f,0x0d,
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0x6a,0x78,0x4e,0x5c,0x22,0x30,0x06,0x14,
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0x25,0x37,0x01,0x13,0x6d,0x7f,0x49,0x5b,
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0x3c,0x2e,0x18,0x0a,0x74,0x66,0x50,0x42,
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0x17,0x05,0x33,0x21,0x5f,0x4d,0x7b,0x69,
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0x0e,0x1c,0x2a,0x38,0x46,0x54,0x62,0x70
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};
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uint8_t crc7update(uint8_t crc, const uint8_t data) {
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uint8_t a = data;
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uint8_t b = data & 1;
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a = crc7tab[(a>>1) ^ crc];
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a ^= ((b<<3)|(b));
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crc = a;
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return a;
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}
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/*uint8_t crc7update(uint8_t crc, const uint8_t data) {
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uint8_t i;
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bool bit;
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uint8_t c;
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c = data;
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for (i = 0x80; i > 0; i >>= 1) {
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bit = crc & 0x40;
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if (c & i) {
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bit = !bit;
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}
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crc <<= 1;
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if (bit) {
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crc ^= 0x09;
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}
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}
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crc &= 0x7f;
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return crc & 0x7f;
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}*/
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