Hoe can I read from the internal resigster of a I2C device (S3 RF)?

Hey guys,

DOes anyody have the experience on reading data from I2C device? I am using MUP9250 and need to read data from a internal register, but I don’t know how. Only the slvae address is required in the function I2C of XBee firmware library, then how to point it at the secific register.

I’m completely new to C++, if you have suggestions, please help. Thanks.