ExtLibs/Mavlink/Mavlink.cs about crc‘s value

// msgid, name, crc, minlength, length, type
new message_info(29, “SCALED_PRESSURE”, 115, 14, 16, typeof( mavlink_scaled_pressure_t )),

Where did CRC(the third parameter 115) come from?

That parameter is the CRC_EXTRA added from Mavlink1.0.

Thanks for your apply! Can i get it from ardupilot firmware ?

You can get if from mavlink. The code generator will create the table that contains the CRC seeds for each messages.

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Thank you very much!