📄 用汇编语言实现bch解码校验算法-2文网.htm
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<h2>用汇编语言实现BCH解码校验算法</h2>
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<P align=left><FONT color=#000000><SPAN class=content>sp;acalltabsub;调用表格子程序，读入表格值<br> clrc<br> subba,r3;Y（X）中的r3和表格值比较<br> jnzbinc1:不相等，转出<br> mova,b；相等，继续<br> acalltabsub<br> clr<br> subba,r4;Y(X)中的r4和表格值比较<br> jnzr2decl:不相等，转出<br> setbf0;相等，置标志位返回<br> ret<br> bincl:incb<br> r2decl:djnzr2,btoa<br> ret;表格查毕，没有相等的值，不置标志位返回<br> 从查找子程序返回的B寄存器的值，即为差错在R（X）中从高位到低位的位数值。<br> ；4位差错表格子程序<br> tabsub:inca<br> movca,@a+pc;将相对位置的表格送入a寄存器<br> ret<br> db0ebh;表格开始，长度为查找子程序中<br> db00；r2寄存器的预置值<br> db76h<br> .<br> .<br> .<br> 4纠错<br> 找到了差错在R（X）位置，就可以纠错了。<br> 纠错的原理比较简单，因为单片机处理的是二进制数，而二进制数只有二个状态，即不是“0”就是“1”。也就是说，R（X）中差错位是“0”，则改为“1”；差错位是“1”，则改为“0”。所以纠错要对所在位求反就行了，程序见本刊网络补充版（http://www.dpj.com.cn）。<br> 至此，整个检错、定位、纠错的BCH码校验检纠过程结束。BCH码校验算法，经过实践的检验，不失为单片机级的数据传输校验好算法。这种方法可以对多位随机差错和多位突发差错进行检验和纠错，具体位数的多少仅受单片机工作频率的限制，而不受方法的限制。<br> <div align=right>本新闻共<font color=red>2</font>页,当前在第<font color=red>2</font>页 <a href=2006063140126032373226440.htm>首页</a> <a href=2006063140126032373226440.htm>上一页</a></div></SPAN></FONT> </P></TD>
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