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iriver h1x0 - RTC (real time clock) mod

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jmdearras:

--- Quote from: roolku on December 26, 2006, 11:25:01 AM ---
--- Quote from: jmdearras on December 26, 2006, 10:07:52 AM ---I have ordered a few DS3231 clock chips, with TCXO, and trim.  They are the same size, and look like the firmware will operate it without change.  Pinout is different.  And the -INT/SQW pin defaults to -INT, and it's disabled.  So no square wave on startup.

--- End quote ---

They have indeed changed the default value for the INTCN on powerup to logic 0.

Let me know how you get on.

--- End quote ---

The parts arrived and I have installed 4 DS3231 chips so far.  They work perfectly with the patch code.  Also, they have no effect on operation even without RockBox installed, including the alarm patch.  The first one I installed was on an old iHP120 I had just repaired, but had not yet flashed Rockbox.  After installation, the iRiver firmware ran without noticing the new chip.  Then when I flashed Rockbox and installed the patched code, the clock showed up, and alarms worked!

Here's the wiring (DS3231 shown upside down, as installed):



Here's the VBat connection point, from a recommendation:


This point is not directly connected to the battery, there is a RC curcuit in the path of unknown value, that causes this point to rise to vBat (no diode drops) over a few seconds after initial battery connection.  

Here's Ground:



Here's the play pad, for the Alarm part of the mod:



I prepared the chip for mounting upside down with superglue by flatening and shortening the leads as below:



(Now that I am writing this, I realize there is no good reason to mount the chip upside down, after bending the leads flat like this!  Hindsight is 20/20! )

Here's where I super glued the chip:



Chip installed:



Here's the final product:



Many thanks to my son for taking the pictures, sizing and adding graphics!

YBIC
Jim

Peter200lx:
I'm getting an error when trying to build against the latest CVS, is there anything else I should try?

http://www.rockbox.org/tracker/task/6419

roolku:

--- Quote from: jmdearras on December 27, 2006, 06:49:13 PM ---The parts arrived and I have installed 4 DS3231 chips so far.

--- End quote ---

Great stuff. I have added a link to this posting to the Wiki page.

IpaqMan:

--- Quote from: Peter200lx on January 03, 2007, 11:50:04 AM ---I'm getting an error when trying to build against the latest CVS, is there anything else I should try?

http://www.rockbox.org/tracker/task/6419



--- End quote ---
I ran into that same problem, too.  I modified the patch file as follows:

 #endif /* HAVE_EEPROM_SETTINGS */
@@ -136,6 +137,8 @@
 drivers/rtc/rtc_pcf50605.c
 #elif (CONFIG_RTC == RTC_S3C2440)            

Software_Samurai:
Fantastic mod! I've been depressed that my poor H120 didn't have an RTC. (But it will soon now!)

IpaqMan: Did you modify the patch file and save it back into the system, or will I need to download the patch file and apply your patch to it?

Cheers!

PS: I ended up buying 10 of the DS3231 chips. As soon as I mod my H120 and make sure it's all working, I'd be more than happy to sell the remaining 9 to anyone for $6/ea (+shipping...probably $2 or less I'm guessing).

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