[linux-dvb] Re: Nova-USB-t v2.1 version

[Andrew de Quincey <adq_dvb@lidskialf.net>]

On Tuesday 27 January 2004 15:11, Holger Waechtler wrote:
> Andrew de Quincey wrote:
> >>>Now: the problem. The ALPS TDLB7 and ALPS TDMB7 both do i2c transfers of
> >>>0 bytes to detect if the devices are present, so the above cannot catch
> >>>the error. The solution would appear to be to fix those tuners so they
> >>> do a transfer of 1 byte (e.g. read a register) from the frontend device
> >>> so the USB i2c error detection code can work. This is whats I'm looking
> >>> into now... if anyone has any suggestions, please let me know.
> >>
> >>yes - replacing the ping by the register read transfer and checking the
> >>error code should work.
> >
> > Question: in the initialisation code, it sets the i2c speed by writing to
> > i2c address 0x10 (0x8 << 1). On the v2.1, thats the TDA10046 demodulator.
>
> where do you see this?

dvb-ttusb-budget.c/ttusb_init_controller():

	/* i2c write read: 5 bytes, addr 0x10, 0x02 bytes write, 1 bytes read. */
	u8 b3[] =
	    { 0xaa, ++ttusb->c, 0x31, 5, 0x10, 0x02, 0x01, 0x00, 0x1e };
	u8 b4[] =
	    { 0x55, ttusb->c, 0x31, 4, 0x10, 0x02, 0x01, 0x00, 0x1e };

...
	/* set i2c bit rate */
	if ((err = ttusb_cmd(ttusb, b2, sizeof(b2), 0)))
		return err;

	if ((err = ttusb_cmd(ttusb, b3, sizeof(b3), 1)))
		return err;

	err = ttusb_result(ttusb, b4, sizeof(b4));
  
b3 is setup for an i2c transfer to device 0x10.


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