Mustang cbbf79b2cf
crc库(#46)
* crc

* 更改crc7

* add crc.h,crc.md

* 调整文件编码格式

* 调整文档

Co-authored-by: fslongjin <longjin@RinGoTek.cn>
2022-09-20 15:12:45 +08:00

39 lines
2.0 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

#include <common/sys/types.h>
/** CRC table for the CRC-7. The poly is 0X09 */
// crc7 generator polynomial : G(x)=x7+x3+1
const uint8_t crc7_table[256] = {
0X00, 0X09, 0X12, 0X1B, 0X24, 0X2D, 0X36, 0X3F, 0X48, 0X41, 0X5A, 0X53, 0X6C, 0X65, 0X7E, 0X77,
0X19, 0X10, 0X0B, 0X02, 0X3D, 0X34, 0X2F, 0X26, 0X51, 0X58, 0X43, 0X4A, 0X75, 0X7C, 0X67, 0X6E,
0X32, 0X3B, 0X20, 0X29, 0X16, 0X1F, 0X04, 0X0D, 0X7A, 0X73, 0X68, 0X61, 0X5E, 0X57, 0X4C, 0X45,
0X2B, 0X22, 0X39, 0X30, 0X0F, 0X06, 0X1D, 0X14, 0X63, 0X6A, 0X71, 0X78, 0X47, 0X4E, 0X55, 0X5C,
0X64, 0X6D, 0X76, 0X7F, 0X40, 0X49, 0X52, 0X5B, 0X2C, 0X25, 0X3E, 0X37, 0X08, 0X01, 0X1A, 0X13,
0X7D, 0X74, 0X6F, 0X66, 0X59, 0X50, 0X4B, 0X42, 0X35, 0X3C, 0X27, 0X2E, 0X11, 0X18, 0X03, 0X0A,
0X56, 0X5F, 0X44, 0X4D, 0X72, 0X7B, 0X60, 0X69, 0X1E, 0X17, 0X0C, 0X05, 0X3A, 0X33, 0X28, 0X21,
0X4F, 0X46, 0X5D, 0X54, 0X6B, 0X62, 0X79, 0X70, 0X07, 0X0E, 0X15, 0X1C, 0X23, 0X2A, 0X31, 0X38,
0X41, 0X48, 0X53, 0X5A, 0X65, 0X6C, 0X77, 0X7E, 0X09, 0X00, 0X1B, 0X12, 0X2D, 0X24, 0X3F, 0X36,
0X58, 0X51, 0X4A, 0X43, 0X7C, 0X75, 0X6E, 0X67, 0X10, 0X19, 0X02, 0X0B, 0X34, 0X3D, 0X26, 0X2F,
0X73, 0X7A, 0X61, 0X68, 0X57, 0X5E, 0X45, 0X4C, 0X3B, 0X32, 0X29, 0X20, 0X1F, 0X16, 0X0D, 0X04,
0X6A, 0X63, 0X78, 0X71, 0X4E, 0X47, 0X5C, 0X55, 0X22, 0X2B, 0X30, 0X39, 0X06, 0X0F, 0X14, 0X1D,
0X25, 0X2C, 0X37, 0X3E, 0X01, 0X08, 0X13, 0X1A, 0X6D, 0X64, 0X7F, 0X76, 0X49, 0X40, 0X5B, 0X52,
0X3C, 0X35, 0X2E, 0X27, 0X18, 0X11, 0X0A, 0X03, 0X74, 0X7D, 0X66, 0X6F, 0X50, 0X59, 0X42, 0X4B,
0X17, 0X1E, 0X05, 0X0C, 0X33, 0X3A, 0X21, 0X28, 0X5F, 0X56, 0X4D, 0X44, 0X7B, 0X72, 0X69, 0X60,
0X0E, 0X07, 0X1C, 0X15, 0X2A, 0X23, 0X38, 0X31, 0X46, 0X4F, 0X54, 0X5D, 0X62, 0X6B, 0X70, 0X79};
/**
* @brief 计算crc7
*
* @param crc crc初始值
* @param buffer 输入缓冲区
* @param len buffer大小bytes
* @return uint8_t crc
*/
uint8_t crc7(uint8_t crc, const uint8_t *buffer, size_t len)
{
while (len--)
{
crc = crc7_table[(crc << 1) ^ *buffer++];
}
return (crc);
}