Kinetis硬件计算crc,小端所有模式都对不上结果

chasedreamsl

 采用Kinetis硬件计算crc，如果是使用大端计算都可得到正确结果。但是使用小端时，计算结果都是错误的。

以下u32 crc32_le(u32 crc, unsigned char const *p, size_t len)从linux内核移植。
/*
* There are multiple 16-bit CRC polynomials in common use, but this is
* *the* standard CRC-32 polynomial, first popularized by Ethernet.
* x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x^1+x^0
*/
#define CRCPOLY_LE 0xedb88320
#define CRCPOLY_BE 0x04c11db7

/**
* crc32_le() - Calculate bitwise little-endian Ethernet AUTODIN II CRC32
* @crc: seed value for computation.  ~0 for Ethernet, sometimes 0 for
*        other uses, or the previous crc32 value if computing incrementally.
* @p: pointer to buffer over which CRC is run
* @len: length of buffer @p
* In fact, the table-based code will work in this case, but it can be
* simplified by inlining the table in ?: form.
*/
u32 crc32_le(u32 crc, unsigned char const *p, size_t len)
{
        int i;
        while (len--) {
                crc ^= *p++;
                for (i = 0; i < 8; i++)
                        crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
        }
        return crc;
}

/**
* crc32_be() - Calculate bitwise big-endian Ethernet AUTODIN II CRC32
* @crc: seed value for computation.  ~0 for Ethernet, sometimes 0 for
*        other uses, or the previous crc32 value if computing incrementally.
* @p: pointer to buffer over which CRC is run
* @len: length of buffer @p
* In fact, the table-based code will work in this case, but it can be
* simplified by inlining the table in ?: form.
*/

u32 crc32_be(u32 crc, unsigned char const *p, size_t len)
{
        int i;
        while (len--) {
<span style="color: rgb(34, 34, 34); font-family: sans-serif; font-size: 14px; line-height: 21px; background-color: rgb(238, 238, 238);">                crc ^= *p++

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FSL_TICS_ZJJ

你这个问题已经创建了SR，而且我们的技术人员已经回了你。

xinyinzhou

CRC官方有例程的，楼主你可以参考看看。