[i2c] Newbie question (documentation on dev-interface)

[Chuck Harrison]

Hi Arnold.

I also am new to i2c-dev. I just recently wrote some routines to
read and write register-based i2c devices; see attachments
(if this list accepts attachments!)

Cheers,
  Chuck


Arnold wrote:
> 
> Hi All,
> 
> Just a simple question. I am a bit confused of the
> documentation on dev-interface. If I'll use a simple
> read command and not smbus_read how do I set the
> register? It was stated there that you dont need to
> set the address byte but set it using
> ioctl(..,slave,..) but what about the register that I
> want to read? where do I set the register? in the
> first byte of the buffer in the read? If the device
> i2c address is 0x10 and the the register I want to
> read is address 0x21, how do set 0x21? I hope somebody
> could help me out with this simple question. Thank you
> very much.
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