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This page is intended as a reference for core developers only, and the content is only changed after a consensus has been reached through discussion of any such changes. Please use the Discussion page to talk about any changes or issues you have with the current implementation.
Classification Digital Port Function
Suggested location WDigital.h
C++ required No
Timing constraints None
Version introduced 1.0 (0100)
Framework dependencies None
uint8_t portRead(uint8_t)
Required? Yes
Issues None



The portRead() function/method returns the digital input value read from the provided port number.

Black Box Input

The port number is provided.

Black Box Output

If possible, the digital value of the input port is read and returned, as either HIGH for a digital "high" value, and LOW for a digital "low" value.


None. Single signature only.


The Atmel AVR8Bit core uses look-up tables to translate the input pin to a port number and a port bit value.

Proposed Changes

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