I2C arduino wire library mod success!!!

[Dan Bowen]

Hello all,

Just wanted to announce that I've successfully tested a mod to the arduino 1.0 wire library that adds a timeout to the freeze-prone while() loops!  I'll put it on github as a separate repo shortly.  For now it is available here: https://github.com/whitestarballoon/Com-Controller/tree/SessionInitiationFixing/Libraries

I know the following debug output will be mostly meaningless to most of you, but the interesting bit is the line where it says I2C library returned error number: 5, and the fact that the arduino continues to operate past the I2C error.  If you're familiar with the Wire library, there is no error 5, that's the new timeout error code!  

Background on what is going on on the I2C bus to cause the freeze:

Some device is continuously holding the I2C data line low, and some other device(s) are constantly clocking the clock line.  In this snippet of debug output the arduino is trying to become master and send an I2C command to a slave device.  When using the standard wire library, the arduino freezes here every time in one of the Wire library while loops.

The arduino would normally just stay frozen after the comment about I2C Packet Length, until you reboot it manually.  Not even the watchdog timer would save it, (I tried it) because the wire library was disabling interrupts that the watchdog timer uses.

Here's the debug output:

TiCk-t 1:18:06:34  !

SAT-D 1:18:06:41  Unsolicited response: SBDRING

CC-D 1:18:06:41  Iridium Satellite Modem is ringing

SAT-I 1:18:06:41  Initiating Iridium Short Burst Data Session...

Sat-D 1:18:06:46  Got good +SBDIX respponse

Sat-D 1:18:06:46    messageOutboundXfer_status: 0, messageInboundXfer_status: 1, msgInb_len: 5, msgs_queuedAtGroundStation: 1

MessageContent from Iridium 9602 Modem ==--> 3a 5 f1 0 0 

CONTENT IS UPLINK COMMAND.  Command not for comm controller, route to I2C Bus!

I2C Packet length: 5

I2CTXERR

I2CTXERR

I2CTXERR

I2CTXERR

I2CTXERR

I2CTXERR

I2CTXERR

I2CTXERR

I2CTXERR

 I2C Library returned error number: 5

TiCk-t 1:18:08:07  !

SAT-D 1:18:08:07  Unsolicited response: 0

SAT-D 1:18:08:07  Unsolicited response: OK

SAT-D 1:18:08:07  Unsolicited response: +CIEV:0,3

Thanks,

Dan

[stea...@gmail.com]

Here to alleviate your i2c headache (hopefully), is the standalone lib plus instructions:

https://github.com/steamfire/WSWireLib

Also, I highly recommend a stream-storing logic analyzer such as the Logic 8 or bug logic 2.

Thanks,

Dan

Sent from my iPhone

On Sep 6, 2012, at 23:19, Troy Reabe <tomas...@gmail.com> wrote:

This sounds great, I have been having I2C lockups that have been driving me up the wall.

What does it take to put this into action and run it in the arduino invioment.

Do I just need to copy the Libary into the the folder or do what is needed to be done to do this?

 

Thank you and I look forward to working I2C

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[Tim Miller]

Any chance this fix will be submitted upstream to Arduino repo?

[Nathan Armentrout]

This is great! Thanks!!

[stea...@gmail.com]

I got it from nightly builds from a while back, but they rejected it in the final Arduino builds.

Thanks,

Dan

Sent from my iPhone