maemo.org - Talk - I2C Tool for Jolla

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- - I2C Tool for Jolla (https://talk.maemo.org/showthread.php?t=92329)

I2C Tool for Jolla

Jolla I2C tool

NOTICE:
Devaamo has lots of unassembled myhalf PCBs (maybe some component-kits too).
Please approach them if you need only one (or two)
Clip to attach Devaamo board (0.8mm) can be printed from this STL file:
https://github.com/kimmoli/myhalf/bl...-clip-08mm.stl

NEW Devaamo modified design V1.20 in my github now
https://github.com/kimmoli/devaamoMyhalf

The tool for probing and debugging I2C bus of Jolla.

Installer package: Download here

Source code: github

http://talk.maemo.org/images/icons/icon4.gif Since 1.0.4.20 i2ctool can be started from application launcher icon (and does not need root-rights)

I2C addressing used is the correct 7-bit (so don't mind the read/write bit)

https://lh3.googleusercontent.com/-7...0109215224.jpg https://lh5.googleusercontent.com/-Z...0109222521.jpg https://lh6.googleusercontent.com/-x...0109214808.jpg https://lh6.googleusercontent.com/-J...0109214739.jpg

If you start i2ctool from command line, it provides messages also there.

Code:

Vdd set OK

probing /dev/i2c-1 address 38: read failed

probing /dev/i2c-1 address 39: read failed

probing /dev/i2c-1 address 3a: read failed

probing /dev/i2c-1 address 3b: read failed

probing /dev/i2c-1 address 3c: device found at address 3c

probing /dev/i2c-1 address 3d: read failed

writing to address 3c: a5 00 55

write ok

reading from address 3c count 2

read 41 41

Re: I2C Tool for Jolla

NOTE This is outdated design - please look Devaamo V1.20
Files in my github: https://github.com/kimmoli/devaamoMyhalf

Additional to the software, there is also hardware available.

Old version eagle files also in https://github.com/kimmoli/myhalf
bill of materials in readme

You can easily order this board from OSHPark - 3 pcs for $17.50

Re: I2C Tool for Jolla

I was wondering... can the GPIO pin be pulled up/down via software? I'll probably need that kind of functionality at some point. And btw, this tool is great for debugging :)

Re: I2C Tool for Jolla

GPIO... hm... at least it didn't complain anything when setting direction as out and writing a value.
have to check does it really toggle state of the pin.

If it does, i can add control of it to the i2ctool.

Re: I2C Tool for Jolla

ok. GPIO (INT) seems to work as output.

Code:

echo 67 > /sys/class/gpio/export

echo out > /sys/class/gpio/gpio67/direction

# changing direction will set output to low

echo 0 > /sys/class/gpio/gpio67/value

echo 1 > /sys/class/gpio/gpio67/value

Picture below is from making pulse from command line
echo 1 > value ; echo 0 > value

and the other one is from setting it back to input, it goes "slowly" up as it is pulled high with pull-up resistor.
echo in > direction

Re: I2C Tool for Jolla

Added quick GPIO control to the i2ctool

Re: I2C Tool for Jolla

Very much appreciated. I have just ordered a set of these. if I can invest the time for tinkering, I will report back with anything I am able to discover.

Most of the time I'm just a wanna be tinkerer, but I have 3 Jollas waiting for my itching fingers...

Re: I2C Tool for Jolla

Any chance you have any extra ones to sell? I would rather buy just 1 and not 3. I live in espoo too so if you're willing to sell one we can meetup.