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The default CRC for the radio is a 16-bit CRC with the polynomial x16 + x15 + x2 + 1 and initialization of all 1s. Other polynomials, lengths, and initializations can be obtained by parameter overrides. It is not straight forward how this can be done, so if you can specify what CRC you are interested in we can see if this can be supported or not.
BR
Siri
We want to check the integrity of my application data, so we want to used CRC to do that. For example, when we write the data, we calculate a CRC value for my data; when we read, calculate a CRC value again and compare previous one.
I think the CRC16 you mentioned is for RF part and it seems that it can not used by my application for data integrity.
So is there any other methods to do CRC or check integrity for my application data.
I think for that use case it makes more sense just using a software CRC algorithm, here is an app note for calculating the CRC based on a 16 bit polynomial.
Please add the following to the overrides list to initialize CRC polynomial as mentioned in your post.
0x40012005, // Set 16 bit CRC(address) 0x59350000, // Set 16 bit CRC(value), 16 bits MSB is the CRC ploynomial 0xFFFF0163, // CRC initialization, 16 bits MSB used for CRC initilization
I had to modify it a bit, and I think my comments are correct, but here is what ended up working for me:
HW32_ARRAY_OVERRIDE(0x2004, 1), // CRC override to support 0x5935 polynomial
0x59350000, // 0x5935 polynomial
0xC0040051, // CRC Init Register Configure
0x00000000, // New CRC init value (should have defaulted to 0x0, but it didn't...?)
0xC0040061, // crcXor Register
0x00000000, // override to set the “crcXor” setting (4-byte value)
