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MCP23017 probelm
Posted: Tue Sep 30, 2025 5:59 pm
by max.tisc
Hi, I'm referring to a previous post of mine regarding interrupts on the MCP23017 component
https://www.flowcode.co.uk/forums/viewtopic.php?t=3107. With the help of Medelec35, the component worked, but now it doesn't. Have there been any updates that have compromised its functionality? Can someone try? I'm connecting it to an STM32F411.
Thanks
Re: MCP23017 probelm
Posted: Tue Sep 30, 2025 8:52 pm
by medelec35
Have you tried redownloading the component I modified.
If hardware still does not then could be a hardware issue.
If your hardware starts working, then I will look into what updates have been applied since I updated the component last.
Re: MCP23017 probelm
Posted: Thu Oct 02, 2025 5:54 pm
by max.tisc
Hi medelc35
I've looked over my hardware again, but I can't find anything strange. I even removed the MCP23017 board and connected it to another BlackPill STM32F411, but it didn't work. I replicated the same code for an Arduino Nano, but it didn't work either. I also replaced the MCP23017 board with a new one. The strange thing is that the INTA and INTB pins are always low. Shouldn't they be high and go low when a port changes state? I'm attaching the test code.
Thanks.