Hello,
> I purchased a TS-7300 without the onboard RTC. I realized that I
> really wanted one, so I purchased (a direct replacement, DS12887A) the
> recommended M48T86PC1 module (TS-7300 Manual) and installed it. My
> soldering skills aren't the best but are usually adequate. I noticed
> in the schematic (after I installed the RTC) that the part is slightly
> different there, a DS1687.
>
> I now get errors trying to access the RTC, "Timed out waiting for time
> change." so I know there is something wrong. I did a search and saw
> one other thread about this error but no resolution to it.
>
> The other thread asked for this, I include it in case it is helpful.
> :root# cat /proc/driver/rtc
> rtc_time : 55:110:55
> rtc_date : 2055-55-110
> rtc_epoch : 1900
> alarm : **:**:55
> DST_enable : yes
> BCD : yes
> 24hr : yes
> square_wave : no
> alarm_IRQ : no
> update_IRQ : no
> periodic_IRQ : no
> periodic_freq : 0
> batt_status : okay
> :root#
>
>
> I'm guessing I have one of the following problems, and hope the group
> can help me pin it down.
>
> 1. I can't solder as good as I thought I could.
> 2. I read the wrong document first and should have ordered the DS1687
> 3. I have the driver for the add on pc104 RTC in my kernel (stock
> SDCard), not the on board RTC.
> 4. I need to modify the driver, and the fix is...
> 5. I need to install an older driver, I can get it...
If I remember correctly there is a special software knock that needs to
be done to enable the battery on the RTC. Once the battery has started
you can use the hwclock command to read/write the RTC date/time. The
software knock is documented in the RTC datasheet.
--
Best Regards,
________________________________________________________________
Eddie Dawydiuk, Technologic Systems | voice: (480) 837-5200
16610 East Laser Drive Suite 10 | fax: (480) 837-5300
Fountain Hills, AZ 85268 | web: www.embeddedARM.com
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