How does charger detection get to the WPS?

[yapper]

On the 2G iPod, the charger connection doesn't appear to be detected. It was (still is?) a problem on the 4G (FS#5826 - no "charger status" in iPod 4g Gray) too.

I've worked out the GPIO inputs to monitor to detect external power, but I don't know what mechanism is used to pass this info to the WPS to allow the charger status to be displayed.

Can someone offer some pointers?

[mcuelenaere]

Try firmware/target/arm/ipod/power-ipod.c

[yapper]

Thanks for that. I've now got charger detection showing on the 2G WPS.

I also had to change config-ipod1g2g.h to #define CONFIG_CHARGING, but I'm not sure if CHARGING_MONITOR or CHARGING_SIMPLE is also required. Currently I'm using CHARGING_MONITOR.

What I can't find is a way to detect 'charging in progress' - again any pointers welcomed! 

[mcuelenaere]

...
What I can't find is a way to detect 'charging in progress' - again any pointers welcomed! 

Did you already try 'bool charging_state(void)' in the same file?

BTW if you get it working, don't forget to post a patch in the Flyspray tracker so it can be committed to SVN.

[yapper]

Did you already try 'bool charging_state(void)' in the same file?

Yes - I can force the 'charging' indication to appear on the WPS.
GPIOB bits 6 and 7, and GPIOC bit 7 all seem to indicate charger connected, but I can't see which GPIO bit indicates 'charging'.

BTW if you get it working, don't forget to post a patch in the Flyspray tracker so it can be committed to SVN.

Sure - I will.

[saratoga]

Isn't charging handled by the PCF50605 chip on the 2G?  I assume you'd get the status of that over I2C.

[yapper]

I think that is true of the 3G, but the 1G (and 2g?) apparently uses an LTC1731, which has a simple active low 'charging' IO pin.

http://electronicdesign.com/Articles/Index.cfm?AD=1&ArticleID=9500&pg=2

EDIT: The patch for detection of charger connection is here: http://www.rockbox.org/tracker/task/9295