有人知道BCH校验码如何计算吗？

[okjpan]

RT

[fjhnuaa]

//BCH校验码
const unsigned char BCH_table[256] =
{
0x00,0x07,0x0E,0x09, 0x1C,0x1B,0x12,0x15, 0x38,0x3F,0x36,0x31, 0x24,0x23,0x2A,0x2D,
0x70,0x77,0x7E,0x79, 0x6C,0x6B,0x62,0x65, 0x48,0x4F,0x46,0x41, 0x54,0x53,0x5A,0x5D,
0xE0,0xE7,0xEE,0xE9, 0xFC,0xFB,0xF2,0xF5, 0xD8,0xDF,0xD6,0xD1, 0xC4,0xC3,0xCA,0xCD,
0x90,0x97,0x9E,0x99, 0x8C,0x8B,0x82,0x85, 0xA8,0xAF,0xA6,0xA1, 0xB4,0xB3,0xBA,0xBD,
0xC7,0xC0,0xC9,0xCE, 0xDB,0xDC,0xD5,0xD2, 0xFF,0xF8,0xF1,0xF6, 0xE3,0xE4,0xED,0xEA,
0xB7,0xB0,0xB9,0xBE, 0xAB,0xAC,0xA5,0xA2, 0x8F,0x88,0x81,0x86, 0x93,0x94,0x9D,0x9A,
0x27,0x20,0x29,0x2E, 0x3B,0x3C,0x35,0x32, 0x1F,0x18,0x11,0x16, 0x03,0x04,0x0D,0x0A,
0x57,0x50,0x59,0x5E, 0x4B,0x4C,0x45,0x42, 0x6F,0x68,0x61,0x66, 0x73,0x74,0x7D,0x7A,

0x89,0x8E,0x87,0x80, 0x95,0x92,0x9B,0x9C, 0xB1,0xB6,0xBF,0xB8, 0xAD,0xAA,0xA3,0xA4,
0xF9,0xFE,0xF7,0xF0, 0xE5,0xE2,0xEB,0xEC, 0xC1,0xC6,0xCF,0xC8, 0xDD,0xDA,0xD3,0xD4,
0x69,0x6E,0x67,0x60, 0x75,0x72,0x7B,0x7C, 0x51,0x56,0x5F,0x58, 0x4D,0x4A,0x43,0x44,
0x19,0x1E,0x17,0x10, 0x05,0x02,0x0B,0x0C, 0x21,0x26,0x2F,0x28, 0x3D,0x3A,0x33,0x34,
0x4E,0x49,0x40,0x47, 0x52,0x55,0x5C,0x5B, 0x76,0x71,0x78,0x7F, 0x6A,0x6D,0x64,0x63,
0x3E,0x39,0x30,0x37, 0x22,0x25,0x2C,0x2B, 0x06,0x01,0x08,0x0F, 0x1A,0x1D,0x14,0x13,
0xAE,0xA9,0xA0,0xA7, 0xB2,0xB5,0xBC,0xBB, 0x96,0x91,0x98,0x9F, 0x8A,0x8D,0x84,0x83,
0xDE,0xD9,0xD0,0xD7, 0xC2,0xC5,0xCC,0xCB, 0xE6,0xE1,0xE8,0xEF, 0xFA,0xFD,0xF4,0xF3
};


void BCH_Calculate(void)
{
BCH_Array[5]=0;

BCH_Array[5]=BCH_Array[5] ^ BCH_Array[0];
BCH_Array[5]=BCH_table[BCH_Array[5]];

BCH_Array[5]=BCH_Array[5] ^ BCH_Array[1];
BCH_Array[5]=BCH_table[BCH_Array[5]];

BCH_Array[5]=BCH_Array[5] ^ BCH_Array[2];
BCH_Array[5]=BCH_table[BCH_Array[5]];

BCH_Array[5]=BCH_Array[5] ^ BCH_Array[3];
BCH_Array[5]=BCH_table[BCH_Array[5]];

BCH_Array[5]=BCH_Array[5] ^ BCH_Array[4];
BCH_Array[5]=BCH_table[BCH_Array[5]];

BCH_Array[5]=~(BCH_Array[5]);
}

[okjpan]

能简单说明一下怎么用吗？

[okjpan]

救命啊

[fjhnuaa]

我晕了，还要怎么说呢？
就是一个算法。

unsigned char BCH_Array[6];
BCH_Array[0] = 0x00;
BCH_Array[1] = 0x01;
BCH_Array[2] = 0x02;
BCH_Array[3] = 0x03;
BCH_Array[4] = 0x04;
BCH_Calculate();

BCH_Array[5]就是最后的校验码！

[okjpan]

好的 谢谢 你的资料哪里来的啊 我在网上查到的其他资料好像都很复杂
没这么简单的 只是想确认一下

[fjhnuaa]

常用的东东

[okjpan]

什么地方能查到相关资料啊 如果能提供 开帖再给100分 谢谢

[fjhnuaa]

你还要啥资料啊，不就是一个算法吗？知道怎么算不就心了.

[okjpan]

因为我看了感觉是CRC校验啊

[fjhnuaa]

http://www.powerprotocol.com.cn/downloadfilse/bch.htm

[fjhnuaa]

这是crc

unsigned int CRC16(unsigned char *AV3_CRC16_start,unsigned char AV3_CRC16_bytes) //*x为指向每行前5个数据的指针
{
unsigned int bx, cx, i, j;

bx = 0xffff;
cx = 0xa001;
for(i=0;i<AV3_CRC16_bytes;i++)
{
bx=bx^AV3_CRC16_start[i];
for(j=0;j<8;j++)
{
if ((bx&0x0001)==1)
{
bx=bx>>1;
bx=bx&0x7fff;
bx=bx^cx;
}
else
{
bx=bx>>1;
bx=bx&0x7fff;
}
}
}
return(bx);
}

[okjpan]

ding

[Murray Mu]

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[okjpan]

ding

[qingse129]

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