[linux-dvb] Re: AVerMedia A777/A16A DVB card - MT352 query

Soyeb Aswat soyeb at btinternet.com
Mon Nov 14 17:47:22 CET 2005


Hello Bill,

I've copied this message to the linux-dvb list which would be a more
appropriate place for this discussion.

I believe these values are discovered by observing the i2c accesses of
the windows drivers whilst running the cards on a Windows machine.  I
also know of people that have used logic probes to find the values.

Of course  I could be mis-understanding everything here....

Soyeb



On Tue, 2005-11-15 at 03:32 +1100, Bill Giannikos wrote:
> Hello All,
> 
> I've been working on trying to add support for the AverMedia A777 and
> A16A cards (I believe these two are exactly the same, except the A777 is
> packaged with a remote).
> 
> So far I have added basic support for the card in saa7134-card.c, got
> the card registering the MT352 and adapted the tuner code (the tuner is
> a Phillips TD1316A) for the MT352.
> 
> What remains, and what I haven't been able to find any documentation
> about, is the initialisation of the MT352. The code below shows a
> example on how to initialise the MT352 on the Avermedia A771 card,
> however I do not know how these values are derived (they are slightly
> different for other MT352 cards). Can anybody with MT352 experience
> provide me any pointers?
> 
> 
> static int advbt777_td1316a_demod_init(struct dvb_frontend* fe)
> {
>         static u8 mt352_clock_config [] = { 0x89, 0x38, 0x2d };
>         static u8 mt352_reset [] = { 0x50, 0x80 };
>         static u8 mt352_adc_ctl_1_cfg [] = { 0x8E, 0x40 };
>         static u8 mt352_agc_cfg [] = { 0x67, 0x10, 0x23, 0x00, 0xFF, 0xFF,
>                                      0x00, 0xFF, 0x00, 0x40, 0x40 };
>         static u8 mt352_av771_extra[] = { 0xB5, 0x7A };
>         static u8 mt352_capt_range_cfg[] = { 0x75, 0x32 };
> 
>         mt352_write(fe, mt352_clock_config, sizeof(mt352_clock_config));
>         udelay(2000);
>         mt352_write(fe, mt352_reset, sizeof(mt352_reset));
>         mt352_write(fe, mt352_adc_ctl_1_cfg, sizeof(mt352_adc_ctl_1_cfg));
> 
>         mt352_write(fe, mt352_agc_cfg,sizeof(mt352_agc_cfg));
>         udelay(2000);
>         mt352_write(fe, mt352_av771_extra,sizeof(mt352_av771_extra));
>         mt352_write(fe, mt352_capt_range_cfg, sizeof(mt352_capt_range_cfg));
> 
>         return 0;
> }
> 
> Regards,
> Bill Giannikos
> 
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