回复:hardware Digest, Vol 10, Issue 15

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回复:hardware Digest, Vol 10, Issue 15

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Today's Topics:

   1. Re: Power leakage: save 40mW by turning GSM on (Andy Green)
   2. Weird hardware mod ??? (scholbert)


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Message: 1
Date: Tue, 20 Jan 2009 11:02:27 +0000
From: Andy Green <[hidden email]>
Subject: Re: Power leakage: save 40mW by turning GSM on
To: Rask Ingemann Lambertsen <[hidden email]>
Cc: [hidden email]
Message-ID: <[hidden email]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

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Somebody in the thread at some point said:

|    I'm unable to measure any difference in power consumption between
WiFi on
| and WiFi off. In the list archives, I see there has been much discussion
| about WiFi power management. It appears that you can't really turn off
WiFi
| power.

It's a bit of a saga, but the end result seems unbinding the driver from
the device or now they are modular in packaging config, rmmod-ing the
modules should do well for power on andy-tracking HEAD.

Previously there was a pin on the module that looked like an on-off
control, but it turned out it was nothing of the sort.

|    Playing with the openmoko-panel-plugin gives:
|
|    BT on increases current draw by 7,5 mA @ 3,79 V.
|    GPS on increases current draw by 47 mA @ 3,79 V.
|
|    For both BT and GPS, current draw reduces to the previous level by
| turning off the device through openmoko-panel-plugin. On to GSM:

Sounds good, although the GPS side may change its consumption radically
depending on whether it has acquired the satellites or not.

|    GSM off further increases current draw by 17 mA @ 3,80 V. :-(
|    GSM on now _decreases_ current draw by 17 mA @ 3,80 V.

Lol.

|    I reboot with 'shutdown -r now', hold AUX to get into NOR u-boot
and boot
| from SD-card. That also recovers the 2,2 mA initially drawn by GSM.

All these things with closed firmware and private state are full of
surprises.

Do we know what the panel-plugin sources are doing to turn it off?
Sending AT commands, or using the /sys, or both?

- -Andy

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------------------------------

Message: 2
Date: Wed, 21 Jan 2009 02:44:50 -0800 (PST)
From: scholbert <[hidden email]>
Subject: Weird hardware mod ???
To: [hidden email]
Message-ID: <[hidden email]>
Content-Type: text/plain; charset=us-ascii


Hi,

after having a deeper look into the schematics of freerunner, i realized
that most of the pins of the Glamo camera interface are physically
accessible at the resistor networks RP1801..1804.

This led me to a wicked idea:
Solder some thin wires to the dedicated signals and use this interface for a
camera module.
I thought about ripping it off from another phone (e.g. Nokia 6600 or 6680)
and attach it to the freerunner.
Of course a kernel driver would also be needed.

Are there any details known about this interface of the Glamo?
Any source code available??

Any comments are welcome!

scholbert
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View this message in context: http://n2.nabble.com/Weird-hardware-mod-----tp2191559p2191559.html
Sent from the Openmoko Hardware mailing list archive at Nabble.com.




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