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