OESF Portables Forum

Everything Else => Model Specific Forums => Distros, Development, and Model Specific Forums => Archived Forums => Nokia Tablet => Topic started by: ghellman on March 01, 2006, 09:20:40 pm

Title: Serial Port For Nokia770?
Post by: ghellman on March 01, 2006, 09:20:40 pm

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 port?

Title: Serial Port For Nokia770?
Post by: rristow on March 14, 2006, 12:15:28 pm

Here's what I've found via experimentation.

1-2-3-4-5-6
-7-8-9-A-B-

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 (http://www.nslu2-linux.org/wiki/HowTo/AddASerialPort) and http://www.i-hacked.com/content/view/66/47/ (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 8N1,115200.

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