The first thing you need to understand is that the Wire library is architecture-specific. I'm perfectly willing to put my modified version up on GitHub, and allow others to beat on it, but eventually we need to figure out how to replace the Wire library distributed with Arduino's basic utilities with the resultant 'approved' version.Īnyone out there know how this is done - who 'owns' the Arduino distributions?ĭoes anyone have a clue who 'owns' this library Does anyone have a clue who 'owns' this library and how we can get these modifications made?
So, it appears we have all the code and modifications we need to eliminate the I2C lockups - but nobody has figured out how to get that version into the basic Wire library that ships with Arduino. I tested this code on a project that would regularly lock up after a few hours at most, and the same hardware ran for 3 days without lockups before I had to shut it down for other reasons. This version is available on my 'Paynter's Palace' blog site at Integrating Time, Memory, and Heading Capability, Part V | Paynter's Palace.
I made a local modification to the Wire library for my own use that merges the code from the 'I2C Master Library' and the twi.c/h changes posted by unaie, along with changes to the Wire class to allow the 'lockup reset counter' to be reset to zero and to be displayed by the user's arduino program. AFAIK, this library still uses the original twi.c/h with the same blocking while() loops. I'm not an I2C expert, but apparently the 'repeated starts' feature is useful for at least some extant hardware. There is a 'I2C Master Library' written by DSSCircuits in September 2012, that modified the Wire library to accommodate the 'repeated starts' feature. The StreamFire library was posted in 2012.
The 'StreamFire' wire library at GitHub - steamfire/WSWireLib: Arduino Wire Library modified to add timeouts to the freeze-prone TWI while() loops has the modifications that prevent infinite 'while()' loops originally posted two years earlier (September 2010) by 'unaie' in. Just like the other posters here, I have tried to figure out why the original Wire library (with the broken twi.c) hasn't been fixed.
Like many others on this forum, I too have had problems with I2C, and after much experimentation it was clear the root problem is the blocking while() loops in twi.c.
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