Dear Forum, There's a function "bit()"; computing me the value of a specified bit, for example bit(6) = 64. How can I do this the other way round? In my case I have a byte telling me which one of 8 inputs caused an interrupt, so each time only one bit is set. I'd like to get a number from 0 to 7…

which bit is set in a byte?

abalone October 20, 2017, 6:02pm 5

I read from an MCP23017 with a Mega 2560.

INTFA/INTFB is the interrupt flag register.

INTCAPA/INTCAPB contains the current state / captured values

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