[linux-dvb] Re: Twinhan DVB-T progress or lack of thereof

[Jamie Honan <jhonan@optusnet.com.au>]

On Fri, Oct 17, 2003 at 11:35:06AM +1000, Dmitri Katchalov wrote:
> I'm trying to get Twinhan DVB-T working. As I mentioned before my card 
> is very similar to VP-1020/VP-1030 so I'm using dst frontend as a 
> starting point. I've added my card's PCI ids to bttv-cards.c and dst.c. 
> Now I can load the drivers and everything seem to go smoothly up to the 
> point where DST frontend attempts to verify the presence of CI in 
> dst_check_ci() function. The first write_dst succeeds, read_dst() also 
> succeeds and returns 0xFF as expected. dst_wait_ready() also succeeds after 
> 0 iterations. The second read_dst() fails with I2CDONE timeout error (-5). 
> 
> This is both good news and bad news. The good news is the first 0xFF reply. 
> At the very least it means that the MCU has received the command and
> successfully verified the checksum. The failure of the second read_dst()
> probably means that the command is not supported or that the MCU has tried 
> to communicate with non-existent CI module and failed.

There may also be some timing problem in the driver.

> The bad news is I don't know what to do next. DST describes itself as DVB-S
> (QAM) frontend while my card is DVB-T (COFDM). The parameters for QAM 
> and COFDM tuners are obviously different and it looks like the format of 
> the i2c "write tuner" command is also different. I'm trying to extract 
> this info from the other OS drivers and I feel I'm getting more and more 
> bogged down in it. Any suggestings appreciated.

Dmitri,

The twinhan support person should be back since 16th.

Sending you her contact details again (was in previous email).

Jamie


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