Re: IR Receiver on an Tevii S470

[Andy Walls <awalls@radix.net>]

On Mon, 2009-11-23 at 00:29 +0200, Igor M. Liplianin wrote:
> On 22 ноября 2009 22:11:47 Andy Walls wrote:
> > On Sun, 2009-11-22 at 19:08 +0100, Matthias Fechner wrote:
> > > Hi Andy,
> > >
> > > Andy Walls wrote:
> > > > Thank you.  I will probably need you for testing when ready.
> > > >
> > > >
> > > > I was planning to do step 1 above for HVR-1800 IR anyway.
> > > >
> > > > I will estimate that I may have something ready by about Christmas (25
> > > > December 2009), unless work becomes very busy.
> > >
> > > thanks a lot for your answer.
> > > I uploaded two pictures I did from the card, you can find it here:
> > > http://fechner.net/tevii-s470/
> > >
> > > It is a CX23885.
> > > The driver I use is the ds3000.
> > > lspci says:
> >
> > [snip]
> >
> > Matthias,
> >
> > Thanks for the pictures.  OK so of the two other interesting chips on
> > the S470:
> >
> > U4 is an I2C connected EEPROM - we don't care about that for IR.
> >
> > U10 appears to perhaps be a Silicon Labs C8051F300 microcontroller or
> > similar:
> >
> > http://www.silabs.com/products/mcu/smallmcu/Pages/C8051F30x.aspx
> >
> > Since the 'F300 has an A/D convertor and has an SMBus interface
> > (compatable with the I2C bus), I suspect this chip could be the IR
> > controller on the TeVii S470.
> >
> > Could you as root:
> >
> > # modprobe cx23885
> > # modprobe i2c-dev
> > # i2c-detect -l
> > (to list all the i2c buses, including cx23885 mastered i2c buses)
> > # i2c-detect -y N
> > (to show the addresses in use on bus # N: only query the cx23885 buses)
> >
> >
> > i2c-detect was in the lm-sensors package last I checked.  (Jean can
> > correct me if I'm wrong.)
> >
> > With that information, I should be able to figure out what I2C address
> > that microcontroller is listening to.
> >
> > Then we can work out how to read and decode it's data and add it to
> > ir-kbd-i2c at least.  Depending on how your kernel and LIRC versions
> > LIRC might still work with I2C IR chips too.
> >
> >
> > All presupposing of course that that 'F300 chip is for IR...
> Receiver connected to cx23885 IR_RX(pin 106). It is not difficult to track.

Igor,

Thank you.  I did not have a board to trace.  I will then stick with my
original plan since the F300 doesn't do the IR.

> F300 is for LNB power control.
> It connected to cx23885 GPIO pins:
> GPIO0 - data - P0.3 F300
> GPIO1 - reset - P0.2 F300
> GPIO2 - clk - P0.1 F300
> GPIO3 - busy - P0.0 F300
> 
> Interface seems not I2C/SMBUS.
>  
> Source code from TeVii:
> http://mercurial.intuxication.org/hg/s2-
> liplianin/file/d0dfe416e0f6/linux/drivers/media/video/cx23885/tevii_pwr.c

Interesting....

   static void Delay1mS(void)
   {
	   udelay(800);
   }

:D

Regards,
Andy

> BR
> Igor