Tx power conttrol issue

[Jiri Fojtasek]

William Tai wrote:

>----- Original Message ----- 
>From: "Jiri Fojtasek" <jiri.fojtasek at hlohovec.net>
>To: <hostap at shmoo.com>
>Sent: Friday, August 01, 2003 1:49 PM
>Subject: Re: Tx power conttrol issue
>
>
>  
>
>>Jirka Bohac wrote:
>>
>>    
>>
>>>>The txpower code is embraced by a MACRO RAW_TXPOWER_SETTING.
>>>>However this macro is not defined yet.
>>>>That's what you mean "I believe txpower control is removed from v0.0.4."
>>>>
>>>>
>>>>        
>>>>
>>>Yes, up to 0.0.3, txpower can be controlled directly with "iwconfig xxx
>>>txpower". However, there are a couple of problems. The setting does not
>>>remain in effect after a "card reset", which is performed from time to
>>>time by the driver. So after the first reset, the power is back on
>>>      
>>>
>"auto".
>  
>
>>>Furthermore, the driver still thinks its on "fixed" and won't let you
>>>set it to "fixed" again, until you first turn it to "auto" and then back
>>>to "fixed" again.....
>>>
>>>I tried to address these issues in my patch, located at
>>>http://jikos.cz/~jbohac/hostap (tha patch also re-enables txpower
>>>control for 0.0.4)
>>>
>>>
>>>Maybe it's because of these problems that Jouni disabled the txpower
>>>control support. He also says that the setting is not accurate - indeed,
>>>the "decibells" you use in iwconfig have NOTHING TO DO with real output
>>>power expressed in dBm. Jouni probably wants to use a special prism
>>>power feedback register, CR58, for more accurate setting.
>>>
>>>However, in our network where most people use the same kind of card, we
>>>have our own calibrations, and we learned to live with the old system.
>>>The absence of txpower control in 0.0.4 is a big pain for us :(
>>>Anything would be better than nothing at all.
>>>
>>>
>>>????
>>>Jouni:
>>>Is any help needed to get txpower control back in the driver?
>>>????
>>>
>>>regards,
>>>
>>>
>>>Jirka
>>>CZFree.Net, Czechia
>>>_______________________________________________
>>>HostAP mailing list
>>>HostAP at shmoo.com
>>>http://lists.shmoo.com/mailman/listinfo/hostap
>>>
>>>
>>>
>>>      
>>>
>>http://www.intersil.com/data/an/AN1037.pdf
>>
>>Here is good explain hows ALC works. Maybe a testing of the CR58, an
>>making feedback to the CR31 every TX frame will solve that txpower
>>behaviour.
>>
>>Jiri
>>
>>    
>>
>Hi Jiri:
>
>    ALC is off when we try to config txpower. Am I right?
>So the ALC you mentioned is another way to control txpower?
>I noticed that there are some configuration stored in PDA.
>So can I modified the content -PDR 0x0300 and PDR 0x0301 to force txpower
>change?
>
>William
>
>
>
>Thanks
>
>
>  
>
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>>    
>>
>
>  
>
PDR have manufacturer forced value for ALC calibration. It should be way 
, but i think more usefull should be made a software ALC calibration 
loop ...

Jiri