Comments (4)
caternuson
commented on July 21, 2024
Also posted here:
https://forums.adafruit.com/viewtopic.php?t=203060
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siteswapjuggler
commented on July 21, 2024
The adafruit forum thread refer to the same problem but didn't mention any possible solution. That's I try to push with this issue.
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siteswapjuggler
commented on July 21, 2024
I did also open a ticket with the microchip support in order to know if the other I2C members of the MCP230XX family like MCP23009 and MCP23018 are also affected or not.
Please notice that the MCP230XX start with all gpio as inputs so the bug can occur even if we don't use the 7th bit in our project. To avoid any problem you may have to set GPIOs 7 to output or activate internal pullup to avoid floating state on this gpio before any reading of the gpio state.
The other solution may be to never read the gpio state register but only use the interrupt capture register which is not affected by the real time change that cause the I2C crash.
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siteswapjuggler
commented on July 21, 2024
I try to reproduce this I07 bug by feeding a pwm signal into the GPIO7 of a MCP23008 and was unable to get any I2C crash. Btw I also tested the getCapturedInterrupt() method and it works great so definitively a good workout for this potential problem.
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Related Issues (20)
- Not working using new Arduino Nano ESP32 development board HOT 4
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- Please add support for reading a “bank” all at once HOT 2
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- Provide access to INTCAP HOT 7
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- Please include an example for using multiple mcp chips HOT 3
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