[linux-dvb] Re: accessing demodulator chip using i2c bus

[Anders Gunnarsson <d00guan@dtek.chalmers.se>]

Christian Höhle wrote:

> Hi again,
>
> I tried to access my Samsung chip, but don't know where exactly it is
> located. So I tried everything from 0x00 to 0xff and used i2c_transfer to
> read address 0x00 (the chip's revision) which should return 0x03, what never
> happens :-( Resetting the chip (which should be done setting value 0x08 on
> address 0x01 (system soft reset mode) did not solve my issue.
>
> When "scanning" the demodulator addresses, mostly i2c_transfer returns -121
> or -5. There are some addresses where it returns something >= 0, but reading
> from that addresses gives a result which is "incompatible" to the manual.
>
> I also tried to read from addresses other than 0x00 (i.e. 0x03-0x04, which
> contains pll settings which default to 0x50 and 0x40), but the results are
> not what I expect them to be...
>
> Any suggestions what to do?
>
> Thanks, Chris
>  
If you refer to the S5H1420, on top of page 13 in the specification it 
says that it has write adress = A0 and read adress = A1 so these are the 
adresses to test with.

/Anders