can 8051 do a crc job easily?

[shanren]

hi,does anybody know about CRC in a 8051 cpu?can a 8051 do this job esayily?i have some important data saved in a nvram,but i found they maybe changed sometimes.for example,a 0X00 changed to 0X01.what can i do to deal with it?
thanks a lot!

 

[verilog]

CRC can be done with a numbers of XOR by serial as well as parallel. Try searching CRC implementation instead of theory.
I think of your purpose, let try parity checking first. Checksum is also a good idea.

 

[Humungus]

you can even find libraries of implemented CRC functions (8, 16)

 

[chaitana]

CRC in 8051 have 2 type of function.
1. Calculate by xor. this function use much time to do. But use a little code.
2. Use table. this function is use a little time. but use more space to keep table.

I have use table.

 

[shanren]

thanks all of you!
but another problem,if i find a bit is wrong,can i recover the data?how can i do it?can this can do in 8051?i do not know much about program.
thank you!

 

[HMaier]

With ECC (Error Check and Correction) you can detect 2 bit error and recover 1bit error. Look at
**broken link removed**

Or search the net for nand_ecc.