How to calculate crc32 in psi/si packet

Not really - we'd have to work out what the protocol is, what parts should be included in the CRC and which shouldn't. Then we'd have to find a CRC generator, and some sample data and try it. Basically, that's doing your work for you, only you get paid for it! :laugh:

Instead, look at what you have so far. The most common mistake when generating checksums of whatever type is including too much or too little data in the sum check: often the "start" and "end" framing characters aren't included in the calculation.
So start by looking at the protocol description, and try using your CRC code on the known examples you have (but we don't) to see what it gives. If that doesn't generate the right values, check the protocol and see if you have included or excluded characters you shouldn't have.
CRC is pretty basic stuff these days, so it shouldn't take you too long to work it out.