[maemo-developers] FW: [maemo-developers] Pinout of the port in the battery compartment?

From: David Briggs dbriggs at Goprolink.com
Date: Tue Apr 18 19:07:07 EEST 2006
Forwarding this reply to the list since it hasn't shown up. (probably because he's not on the list)

-----Original Message-----
From: Noli.Sicad at csiro.au [mailto:Noli.Sicad at csiro.au]
Sent: Tuesday, April 18, 2006 12:14 AM
To: David Briggs; maemo-developers at maemo.org
Subject: [maemo-developers] Pinout of the port in the battery

Hi David,

I am not subscribe to maemo-developer/Nokia 770 developer list. I am
just reading.

I found this (below)


I think this is you are looking.

Regards, Noli

Noli Sicad


Any one knows how to add a serial port to the Nokia770. I am trying to
debug the device and it is very hard with out any output.

I have noticed an 11 pins conector (pad) in the battery compartment of
the device, is their any chance that some of those pins are for serial

Here's what I've found via experimentation.


Pin 9 is RxD (Nokia receive input) and pin A is TxD (Nokia transmit
output). These are the third and second pins from the right towards the
battery, respectively.

I used the metal shield as a ground. The outputs are evidently 3.3v - I
used a USB-mobile phone cable as described in
http://www.nslu2-linux.org/wiki/HowTo/AddASerialPort and
http://www.i-hacked.com/content/view/66/47/ to connect to the device.

I enabled the R&D mode and set the serial console flag and connected via

I don't know of a suitable connector - I used a couple of stiff wires
held in place with electrical tape.

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