I2C netduino plus 2

I have a small test project running on the netduino plus.

( so any hardware or pull-up etc is ok )

and want to test it as well on the netduino plus 2.

the problem is the execute methode returns always 0 ( zero )

the divice address is 27 or (0x1B)

I also found with nothing connected on the netduino plus 2 board,

the i2c. execute always return 0

the old netduino plus with nothing connected always return 2.

any ideas ?

thanks

Johan

I had the same results when experimenting with pullups and the I2C bus locking issue.  If there was nothing there and no pullups then the bus got into a locked state, always returned 0.

Interestingly enough the arduino uno r3 hardware does not have this problem.

Have you upgraded your ND+2 to the latest firmware with the I2C fixes?  Is this one of the things you tried?

Hi Dave / Yogotie,

I realy hope to get this solved.

I'm struggeling for a week now with this.

I also read on a form the new ND2+ does not need pullups ?

Yes i updated the firmware, [color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]Version: 4.2.2 Update 2 (version 4.2.2.2)[/color]

http://forums.netdui...-v422-update-2/

-> i used the new SDA SDL connectors that should be ok ?

-> tried 3,3 and 5,0 Volts.

-> i have 1,2 Kb pullups  ( http://www.dsscircui...-resistors.html )

also the external reference: ( tried both )

SecretLabs.NETMF.Hardware.NetduinoPlus.dll ( 07-01-2013 )

SecretLabs.NETMF.Hardware.Netduino.dll  ( 27-10-2012 )

i think it should be newer file ?

The board is REV.A ?

should i change the pullups ? to 10k ?

I have 2 x DS2482 on the I2C bus. and this was quite ok, with the older ND1+.

Any help would be great.

Thanks

Also i found this in a post, from Mr Walker.

So the NetDuinoPlus.dll should be removed.

[color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]In the meantime, if you are upgrading your Netduino Plus 1 projects to Netduino Plus 2:[/color]

[*]Remove the SecretLabs.NETMF.Hardware.NetduinoPlus.dll reference from your project.
[*]Add the SecretLabs.NETMF.Hardware.Netduino.dll reference to your project
[*]Change the deployment target in Project Properties > .NET Micro Framework
[/list]

for the pullups: id suggest using 4.7 kilo-ohm - that worked great for me.

when adding more devices you can lower that, but from my experience most modules have allready pullups included

i havent changed my 4.7k so far, and iam using like 5 devices on the i2c bus

To be sure. did you use the new SDA / SDL connectors ?

I try tonight to change the resistors. hope it will be solved.

thanks

I have tried 1 and 2 devices and also the 4,7K  2,2K and 10K.

but no luck yet. the execute method still gives zero.

could it be a Rev.A issue ? of the netduino plus 2 ?

I have not experienced any issues with ND+2 and I2C devices.  I have dozens of different I2C devices and all work fine on the ND+2.  All are using the proper Pullup Resistors and all are connected to the SDA and SCL lines not A4 & A5.  All of my boards are running the 4.2.2.2 firmware.

I still believe its an issue with your software or hardware wiring.

My software and hardware works fine. on diferent boards as well.

also on the old NetDuino Plus (1).

this same problems i have is also on the STM32F4 Discovery.

Dave, could you test this small piece of code ? on your I2C bus ?

Hi Dave,

your idea, could be right it could still be software. 

i was thinking if it runs on the old netduino it should also run on the netduino 2.

thanks

Hi Dave,

 

your idea, could be right it could still be software. 

i was thinking if it runs on the old netduino it should also run on the netduino 2.

 

thanks

In the beginning of the ND+2 release, there were known I2C issues with the earlier firmware but that has been resolved.  The only difference is the dedicated SDA and SCL pins.  I was able to easily transfer everything I had from ND+ to ND+2 and just move the two I2C wires on my shield from A4/A5 to SDA/SCL and everything ran like it always did.

I'll fire up one of my backup ND+2's tomorrow and test the code.  I will let you know what I find in about 24 hours from now.

New Update,

i have been checking the I2C signal, on the old ND+ i get 3,3 and 0 signals or 5volt/0 volt on the 

I2C wires.

with the same hardware on the ND2+ the I2C signal is not pulled down to 0volt correctly.

the ND2+ is trying to communicate. it's like the signal is floating a bit.

any idea how to solve this ?

I down graded the firmware to 4.2.1.1, and got the ND2+ sending some signals again on the I2C bus.

but the software I2C execute still give zero.