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Re: Recommendation for setting CONFIG_ETRAX_DS1302_TRICKLE_CHARGE ?



The devboard 82 has a battery so, the trickle charger should not be used,
value=0.
The devboard_lx has a capacitor, and that need the trickle charge setting
to charge, value=5.

/Johan

----- Original Message ----- 
From: "Randy Graham" <rgraham@xxxxxxx.com>
To: "'Johan Adolfsson'" <johana@xxxxxxx.com>
Sent: Wednesday, September 15, 2004 8:00 PM
Subject: Recommendation for setting CONFIG_ETRAX_DS1302_TRICKLE_CHARGE ?


> Hello,
>
> In reference to an earlier post (see below), can someone at Axis recommend
a
> setting to use for CONFIG_ETRAX_DS1302_TRICKLE_CHARGE ?
>
> I am developing for device server 82/83 and need the clock to be correct
> after cycling power.
>
> Am I correct to assume that the clock loses its time after a power cycle
> with the default factory settings?
>
> Thanks,
>
> -Randy
>
> -----Original Message-----
> From: owner-dev-etrax@xxxxxxx.com">mailto:owner-dev-etrax@xxxxxxx.com] On Behalf
> Of Johan Adolfsson
> Sent: Thursday, August 19, 2004 1:41 PM
> To: dev-etrax@xxxxxxx.com; Frank Brown
> Subject: Re: DateTime lost between reboots.
>
> Just to clarify, the devboard_82 has a battery and the
> devboard_lx has a capacitor.
> There is a since some time a kernelconfig option to configure
> how the capacitor should be charged so you don't need to use
> hwtestrtc for that.
>
> CONFIG_ETRAX_DS1302_TRICKLE_CHARGE
>   This controls the initial value of the trickle charge register.
>   0 = disabled (use this if you are unsure or have a non rechargable
> battery)
>   Otherwise the following values can be OR:ed together to control the
>   charge current:
>   1 = 2kohm, 2 = 4kohm, 3 = 4kohm
>   4 = 1 diode, 8 = 2 diodes
>   Allowed values are (increasing current): 0, 11, 10, 9, 7, 6, 5
>
> /Johan
>
> ----- Original Message ----- 
> From: "Frank Brown" <fcb3@xxxxxxx.net>
> To: <dev-etrax@xxxxxxx.com>
> Sent: Thursday, August 19, 2004 6:29 PM
> Subject: Re: DateTime lost between reboots.
>
>
> > The important reason to use hwtestrtc to set up the time
> > the first time-> The Axis board uses a huge capacitor to
> > maintain the clock chip. For obviously good reasons, this
> > capacitor has a controllable connection for charging when
> > the board is powered up. This is a rather unique function
> > function, and would never be part of a generic linux program.
> > Axis ships the board with this port turned off, so until you
> > set it up, your clock will reset to year 2k on startup. It's a
> > very good idea, but one does wish you didn't have so much
> > trouble discovering it.
> >
> > try hwtestrtc ? to see the syntax. I set my diodes/resistor
> > to a 1 (C1).
> >
> > f
> >
>
>
>