How can I put in and calculate my own data in the CRC module?

[Anonymous]

        I used a software calculated CRC but it takes too much time for calculating. So I want to implement the hardware CRC module of the controller. In the first step, I build it up like in the CRC example project given by Cypress. There is a permanent hight signal at the input. In the second step, I want to put in my own data over a register like given in the attached picture. But the calculated CRC doesn't fit. Can someone give me an advice, how I can calculate my own data? Greetings Markus   

[Bob_Marlowe]

The result of the CRC calculation depends on the polynomia you use. You should check that with your former algorithm.

   

To save some resources, you may ^combine your control-registersw into a single one and write the corresponding bit patterns to it.

       

Bob

[Anonymous]

The polynomia is checked, that is the same in both cases which I compared. It seems to be a problem tht I  wanted to write byte wise but I have to put every single bit in it.

   

That I  just tried out but I got different values. I use the polynomia 0x8005 and I put always a 1 in it. My software calculation gives a 0x0202 after 1 byte input as result. When I try the same with the hardware module the result is:

   

After bit 1: 0x000B; after bit 2: 0x001D; 0x0031; 0x0069; 0x00D9; 0x019; 0x0379 and after bit 8 0x06F9 but not 0x0202 what I expected.