Comments (10)
PsuFan
commented on August 22, 2024
I have seen this issue too. Root cause was a floating not connected input with a interrupt enabled from previous compile not being reset. This floating interrupt floods the chip/data line with messages making it impossible to even control outputs. Ensure all interrupted pins are high and add code to begin from PR #55 to disable previously interrupted pins or ensure chip is reset.
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izamoramx
commented on August 22, 2024
@PsuFan thanks for the reply. I am not sure which code you are referring to. Maybe I missed it, if so please let me know. Otherwise it seems that the solution you are referring to has been implemented to the latest version of the library. If I understand this correctly, I will update my version to use this latest fix. Thanks again.
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PsuFan
commented on August 22, 2024
Yes that is correct, see how the latest version works. A change to the interrupt example was also approved that ensures the interrupt is cleared.
Again ensure all interrupted pins are high (or low) as desired and not floating.
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izamoramx
commented on August 22, 2024
Ok fantastic!
You mean only the pins actually being used as INT correct? Not all the possible INT pins on the chip. I do have some pins that are part of the INT group but they are being used for other purposes. I would expect those wouldn't be affected.
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PsuFan
commented on August 22, 2024
Yes the pins you define with mcp.setupInterruptPin(THIS_PIN,FALLING);
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izamoramx
commented on August 22, 2024
Ok great. Thanks again! I will try that
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caternuson
commented on August 22, 2024
@izamoramx Did the suggestions above resolve this?
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izamoramx
commented on August 22, 2024
@izamoramx Did the suggestions above resolve this?
@caternuson Sorry, I haven't had a chance to test the latest version of the library for this issue as I have to pause on that project to work on others but I am expecting to resume that in the next month or so and will be able to verify if the issue persists or not and get back to you.
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caternuson
commented on August 22, 2024
OK, please also update to the 2.0.0 release of the library:
https://github.com/adafruit/Adafruit-MCP23017-Arduino-Library/releases/tag/2.0.0
It changes things a lot.
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caternuson
commented on August 22, 2024
Closing. Hoping fixed. Can reopen if still an issue.
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