Wire I2C Slave « LeafLabs Garden

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Wire I2C Slave

(6 posts) (4 voices)

Started 1 year ago by phase1
Latest reply from crenn

phase1
Member

Hello,

I want to interface the Maple with another board and want to make the maple as a master and slave on the two I2C on the maple mini.

The hardware setup goes like this:

Sensor <-- (I2C_1 as Master) Maple Mini <-- (I2C_2 as slave) Embedded Board

I'm wondering if this is possible. If it is possible, then am i able to write the contents of the sensor readings to the board so that the embedded board is then able to read from it?

I'm not too familiar with the I2C protocol, but have only ever used it to interface with sensors.

Thanks,

Richard

Posted 1 year ago #
gbulmer
Moderator

phase1 - yes the two I2C interfaces are independent and can be configured to be master or slave. Your software can do anything you want, so reading from the sensor, and passing it to the embedded board should be practical.

I2C is a little complex, and needs a bit of care to get working right. Try to divide the program into several parts, so that you can test the major parts easily.

(Full disclosure: I am not a member of Leaflabs staff.)

Posted 1 year ago #
phase1
Member

Hi gblumer,

Would you happen to have any documentation as to how I would set up the Maple as an I2C slave?

I've tried to find some documentation but haven't come up with anything yet. So i think the way it works is that the sensor reading program will write to the I2C_2 addresees and then the embedded board will read from it, but where can i find the address to write to?

Thanks

Posted 1 year ago #
gbulmer
Moderator

phase1 - I don't have code.
However, I think member 'crenn', who has written a SoftWire implementation, might have published examples.
I have had a quick look, but, sorry, I can't find the correct thread.

Do you need a high data rate? If it isn't too high, the soft I2C implementation might be easier to debug and get working.

This application note (AN2824) might help:
http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/CD00209826.pdf

Posted 1 year ago #
manitou
Member

here is an old thread on I2C slave. I don't know if Crenn followed up with lib update or not ...

http://forums.leaflabs.com/topic.php?id=1543

Posted 1 year ago #
crenn
Moderator

Sadly the answer is no, I didn't follow up adding in slave support, there was also other bug fixes I was working on at the time to fix other problems. But due to my inactivity of late, I can't even remember what bugs I was fixing. I'll try looking into it again soon enough.

Posted 1 year ago #

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