Re: cx24116 & roll-off factor = auto

[Alex Betis <alex.betis@xxxxxxxxx>]

On Fri, Jan 23, 2009 at 9:49 PM, Goga777 <goga777@xxxxx> wrote:

> > does support cx24116  the roll-off factor = auto ?
>
> no

who should be care about of corrected roll-off factor which have to send to cx24116 - the drivers or user software ? does
roll-off factor = 0,35 good for 99% dvb-s2 channels ?

Driver interface allows specifying AUTO value for most of the parameters.
User application has no idea what card is used and what driver is running.
Since there are other drivers/chipsets that can handle AUTO setting, I don't see any reason why application should not use it.

For example, DVB-S uses only rolloff = 0.35, so if the driver knows that the chip can't accept auto value, it should use 0.35 value by default in that case.

Beside all that, there is a bigger problem that pops up with cx24116 chips using S2API.
When specifying AUTO value for any of the parameters the driver fails the tuning, but the application knows nothing about it, so it thinks that current received stream is from the new channel, while its not true.

Goga



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