Detailed Description

All Elements that extend the number of IO pins of the Arduino: Includes shift registers (e.g. 74HC595), multiplexers (e.g. 74HC4067, 74HC4051), port expanders (e.g. MCP23017), LED drivers (e.g. MAX7219), etc.

GPIO pins of port expanders are represented by the pin_t struct (internally, this is just an integer). Overloads of the standard Arduino IO functions such as pinMode, digitalRead, digitalWrite etc. are provided for pin_t to allow these “extended” pins to be used transparently.

See ExtendedIOElement for details.

Collaboration diagram for Extended Input/Output:

Classes
class	AnalogMultiplex< N >
	A class for reading multiplexed analog inputs. More...

class	MAX7219< NumChips, SPIDriver >
	A class for LED outputs using the MAX7219 LED display driver. More...

class	MCP23017< WireType >
	Class for MCP23017 I²C I/O expanders. More...

class	ShiftRegisterOut< N >
	A class for serial-in/parallel-out shift registers, like the 74HC595. More...

class	ShiftRegisterOutBase< N >
	A class for serial-in/parallel-out shift registers, like the 74HC595. More...

class	SPIShiftRegisterOut< N, SPIDriver >
	A class for serial-in/parallel-out shift registers, like the 74HC595 that are connected to the SPI bus. More...

Typedefs
using	CD74HC4067 = AnalogMultiplex<4>
	An alias for AnalogMultiplex<4> to use with CD74HC4067 analog multiplexers.

using	CD74HC4051 = AnalogMultiplex<3>
	An alias for AnalogMultiplex<3> to use with CD74HC4051 analog multiplexers.

Functions
bool	isNativePin (pin_t pin)
	Check if the given pin number is a real Arduino pin number, and not an ExtIO pin number.

ExtendedIOElement *	getIOElementOfPinOrNull (pin_t pin)
	Find the IO element of a given extended IO pin number.

ExtendedIOElement *	getIOElementOfPin (pin_t pin)
	Find the IO element of a given extended IO pin number.

void	pinMode (pin_t pin, PinMode_t mode)
	An ExtIO version of the Arduino function.

void	digitalWrite (pin_t pin, PinStatus_t val)
	An ExtIO version of the Arduino function.

PinStatus_t	digitalRead (pin_t pin)
	An ExtIO version of the Arduino function.

analog_t	analogRead (pin_t pin)
	An ExtIO version of the Arduino function.

void	analogWrite (pin_t pin, analog_t val)
	An ExtIO version of the Arduino function.

void	analogWrite (pin_t pin, int val)
	An ExtIO version of the Arduino function.

void	shiftOut (pin_t dataPin, pin_t clockPin, BitOrder_t bitOrder, uint8_t val)
	An ExtIO version of the Arduino function.

void	pinModeBuffered (pin_t pin, PinMode_t mode)
	A buffered ExtIO version of the Arduino function.

void	digitalWriteBuffered (pin_t pin, PinStatus_t val)
	A buffered ExtIO version of the Arduino function.

PinStatus_t	digitalReadBuffered (pin_t pin)
	A buffered ExtIO version of the Arduino function.

analog_t	analogReadBuffered (pin_t pin)
	A buffered ExtIO version of the Arduino function.

void	analogWriteBuffered (pin_t pin, analog_t val)
	A buffered ExtIO version of the Arduino function.

void	analogWriteBuffered (pin_t pin, int val)
	A buffered ExtIO version of the Arduino function.

Typedef Documentation

◆ CD74HC4067

using CD74HC4067 = AnalogMultiplex<4>

An alias for AnalogMultiplex<4> to use with CD74HC4067 analog multiplexers.

Definition at line 185 of file AnalogMultiplex.hpp.

◆ CD74HC4051

using CD74HC4051 = AnalogMultiplex<3>

An alias for AnalogMultiplex<3> to use with CD74HC4051 analog multiplexers.

Definition at line 193 of file AnalogMultiplex.hpp.

Function Documentation

◆ isNativePin()

bool isNativePin ( pin_t pin )

inline

Check if the given pin number is a real Arduino pin number, and not an ExtIO pin number.

Definition at line 24 of file ExtendedInputOutput.hpp.

◆ getIOElementOfPinOrNull()

ExtendedIOElement * getIOElementOfPinOrNull ( pin_t pin )

Find the IO element of a given extended IO pin number.

Parameters

pin	The extended IO pin number to find the IO element of.

Returns: A pointer to the extended IO element that the given pin belongs to.

Definition at line 14 of file ExtendedInputOutput.cpp.

◆ getIOElementOfPin()

ExtendedIOElement * getIOElementOfPin ( pin_t pin )

Find the IO element of a given extended IO pin number.

Parameters

pin	The extended IO pin number to find the IO element of.

Returns: A pointer to the extended IO element that the given pin belongs to. Throws an error if the element was not found.

Definition at line 23 of file ExtendedInputOutput.cpp.