Re: Fast channel switching

sysUDelayFlash its ath_hal_delay(int n) /* Delay n microseconds */
I use non Linux OS ...

ar5212SetChannel5112work2192(2192); //set freq 2192 MHz 
ar5212SetChannel5112work2192(2195); //set freq 2195 MHz 
...
ar5212SetChannel5112work2192(2512); //set freq 2512 MHz 

and hard_reg ...
0xB8510024 its AR_IER                  0x0024  /* MAC Interrupt enable register */
0xb851981c its AR_PHY_ACTIVE           0x981C  /* activation register */ 
0xb8519860 its AR_PHY_AGC_CONTROL      0x9860  /* chip calibration and noise floor setting */

0xb851989C & 0xb85198D8  its regs for internal use ...


-----Original Message-----
From: Vishal Sevani <[email protected]>
To: [email protected]
Date: Tue, 23 Feb 2010 12:05:05 +0530
Subject: Re: [Madwifi-users] Fast channel switching

> On Mon, Feb 22, 2010 at 10:19 PM, IVAN KORSHUN <[email protected]> wrote:
> 
> > void ar5212SetChannel5112work2192(UINT32 freq)
> > {
> > /* Step 5 MHz */
> >           UINT32       ii,channelSelect;
> > volatile   UINT32 *hard_reg;
> >
> >        channelSelect = ((freq - 672) * 2 - 3040)/10;
> >            channelSelect = (channelSelect << 2) & 0xff;
> >            channelSelect = ath_hal_reverseBits(channelSelect, 8);
> >
> >
> >        channelSelect = (channelSelect << 4) | 0x1005;
> >
> >        hard_reg = (void*)0xB8510024; *hard_reg = 0x0;
> >        sysUDelayFlash (0x3E8);
> >        hard_reg = (void*)0xb851981c; *hard_reg = 0x0;
> >        sysUDelayFlash (0xA);
> >        hard_reg = (void*)0xb851989C; *hard_reg = (channelSelect & 0xff);
> >
> >        channelSelect = (channelSelect >> 8) & 0x7f;
> >        hard_reg = (void*)0xb85198D8; *hard_reg = channelSelect;
> >        sysUDelayFlash (0xA);
> >        hard_reg = (void*)0xb851981c; *hard_reg = 0x1;
> >        sysUDelayFlash (0x64);
> >        hard_reg = (void*)0xb8519860;
> >        *hard_reg = *hard_reg |0x2;
> >        channelSelect = 0x2;
> >        for (ii=0; (ii< 0x3FFFE) && channelSelect ;ii++)channelSelect =
> > *hard_reg & 0x2;
> >
> >        hard_reg = (void*)0xB8510024; *hard_reg = 0x1;
> >
> > }
> >
> 
> Hi Ivan
> 
> Do you intend to suggest that I can call this function directly for
> switching the frequency?? If so could you please explain as to what the
> function does. You are setting the values for the variable, hard_reg and
> channelSelect, but dont you need to set these values in the register so that
> the hardware actually changes the channel?
> 
>  Also what is the definition for the function, sysUDelayFlash () since it is
> not available in the madwifi code.
> 
> Thanks
> Vishal
> 
> >
> > -----Original Message-----
> > From: Vishal Sevani <[email protected]>
> > To: [email protected]
> > Date: Mon, 22 Feb 2010 14:10:04 +0530
> > Subject: Re: [Madwifi-users] Fast channel switching
> >
> > > On Sat, Feb 20, 2010 at 5:00 AM, Pavel Roskin <[email protected]> wrote:
> > >
> > > > On Fri, 2010-02-19 at 15:17 +0530, Vishal Sevani wrote:
> > > >
> > > > >         > I did apply the following patch
> > > > >         > https://madwifi-project.org/ticket/2322 , but to no avail.
> > > > >         Could you
> > > > >         > point out as to what the problem could be?? If you need me
> > > > >         to provide
> > > > >         > any other debug information please do let me know.
> > > > >
> > > > >
> > > > >         I'll appreciate if you post your results to the ticket.  So
> > > > >         far there
> > > > >         have been no test results for that patch at all.
> > > > >
> > > > > Yeah I have posted my experience in the following ticket.
> > > > > https://madwifi-project.org/ticket/2359
> > > >
> > > > I actually I meant that you would report a negative result with the
> > > > patch in #2322.  But it looks like the problems are different.
> > > >
> > > > Yeah it seems more of a hardware issue with AR71xx borad, (or issue
> > with
> > > Openwrt) as pointed out by [email protected] in his comment following
> > yours
> > > in the ticket #2359. If Iam correct, it is happening because the value in
> > > reg AR_ISR corresponding to flag AR_ISR_HIUERR is being set, which is for
> > > unexpected bus error. As mentioned in the following post
> > > http://n2.nabble.com/fatal-interrupt-td3225930.html, it is beacuse the
> > > following bit, AR_ISR_S2_MCABT  (for master cycle abort) is being set.
> > >
> > > Iam clueless as to what could be causing this master cycle abort problem
> > and
> > > how should I go about debugging it. Could you please provide any pointers
> > as
> > > to how I can rectify this problem.
> > >
> > >
> > > > > Yesterday again I tried with latest release of Openwrt Kamikaze  ie.
> > > > > v8.09.2, but still I get the same problem. But the madwifi code works
> > > > > properly on IBM latop running Ubuntu with Linux kernel 2.6.24-23. So
> > I
> > > > > guess it is the issue with Openwrt or the hardware ie. AR71xx boards.
> > > > > Has the latest code been tested on Openwrt and Ar71xx boards??
> > > >
> > > > I'm not aware of it.
> > > >
> > > > --
> > > > Regards,
> > > > Pavel Roskin
> > > >
> > >
> > >
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> >
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> ------------------------------------------------------------------------------
> Download Intel  Parallel Studio Eval
> Try the new software tools for yourself. Speed compiling, find bugs
> proactively, and fine-tune applications for parallel performance.
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> 
> 

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