[Voyage-linux] Negative temperature reading on Wrap

[Tommaso Cavanna - Wave s.r.l.]

Hello to everybody,

 

    this is my first message to the mailing list. 

First of all I would like to thank everybody worked on Voyage since it’s
very stable and useful.

I have successfully installed and configured Voyage 0.2 pre1 on Wrap board
with CM9 card.

Following the Readme instructions I have installed the LM77 driver to read
the board temperature.

After the LM77 driver installation I got a new directory
/sys/bus/i2c/drivers/lm77/0-0048/ and I read the sensor temperature with:
cat temp1_input.

I got reasonable readings while the temperature board is higher than 0°C;
since I’m testing the behaviour of the router under 0°C I cooled down the
Wrap board to -10 °C. 

The board correctly booted-up, and I can enter the ssh login in order to
read the LM77 temperature, but when I read the temp1_input value I get:
4095000 value. 

Since I expected a negative value, what does it mean 4095000?

Has anybody performed under zero degree measurements with LM77?

 

Tom

 

 

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