I have something that's mystifying me and I'm hoping someone can explain. Background: I'm using PORTB in this case. I have DDRB = 0xFF; and PORTB = 0xFF; I have an external chip that pulls down one of 6 pins on PORTB. Each one triggers a pin change interrupt. First thing I do in the ISR is check…

PORTx vs. digitalRead()

Forum 2005-2010 (read only) Hardware Troubleshooting

mellis July 8, 2007, 2:45am 2

Huh, strange; I don't have any ideas off of the top of my head. Can you post the full source for your sketch (or a simplified version that illustrates the problem)?

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PORTx vs. digitalRead()

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