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

#include <AH/Hardware/ExtendedInputOutput/SPIShiftRegisterOut.hpp>

Inheritance diagram for SPIShiftRegisterOut< N >:

Collaboration diagram for SPIShiftRegisterOut< N >:

Public Types
using	BitOrder_t = typename ShiftRegisterOutBase< N >::BitOrder_t

Public Member Functions
	SPIShiftRegisterOut (pin_t latchPin=SS, BitOrder_t bitOrder=MSBFIRST)
	Create a new SPIShiftRegisterOut object with a given bit order, and a given number of outputs. More...

void	begin () override
	Initialize the shift register. More...

void	update () override
	Write the state buffer to the physical outputs. More...

void	pinMode (pin_t pin, uint8_t mode) override __attribute__((deprecated))
	The pinMode function is not implemented because the mode is `OUTPUT` by definition. More...

void	digitalWrite (pin_t pin, uint8_t val) override
	Set the state of a given output pin. More...

int	digitalRead (pin_t pin) override
	Get the current state of a given output pin. More...

analog_t	analogRead (pin_t pin) override __attribute__((deprecated))
	The analogRead function is deprecated because a shift is always digital. More...

void	analogWrite (pin_t pin, analog_t val) override __attribute__((deprecated))
	The analogWrite function is not deprecated because a shift is always digital. More...

pin_t	red (pin_t id)
	Get the red output pin of the given LED. More...

Array< pin_t, N/3 >	redPins ()
	Get an array containing all pins with red LEDs. More...

pin_t	green (pin_t id)
	Get the green output pin of the given LED. More...

Array< pin_t, N/3 >	greenPins ()
	Get an array containing all pins with green LEDs. More...

pin_t	blue (pin_t id)
	Get the blue output pin of the given LED. More...

Array< pin_t, N/3 >	bluePins ()
	Get an array containing all pins with blue LEDs. More...

Array< pin_t, N >	pins () const
	Get an array containing all pins of the element. More...

pin_t	pin (pin_t pin) const
	Get the extended IO pin number of a given physical pin of this extended IO element. More...

pin_t	operator[] (pin_t pin) const
	Get the extended IO pin number of a given physical pin of this extended IO element. More...

pin_t	getLength () const
	Get the number of pins this IO element has. More...

pin_t	getEnd () const
	Get the largest global extended IO pin number that belongs to this extended IO element. More...

pin_t	getStart () const
	Get the smallest global extended IO pin number that belongs to this extended IO element. More...

Static Public Member Functions
static constexpr uint16_t	length ()

static void	beginAll ()
	Initialize all extended IO elements. More...

static DoublyLinkedList< ExtendedIOElement > &	getAll ()
	Get the list of all Extended IO elements. More...

Protected Attributes
const pin_t	latchPin

const BitOrder_t	bitOrder

BitArray< N >	buffer

bool	dirty = true

ExtendedIOElement *	next

ExtendedIOElement *	previous

Private Attributes
const pin_t	start

const pin_t	end

Static Private Attributes
static pin_t	offset = NUM_DIGITAL_PINS + NUM_ANALOG_INPUTS

static DoublyLinkedList< ExtendedIOElement >	elements

Detailed Description

template<uint8_t N>
class AH::SPIShiftRegisterOut< N >

A class for serial-in/parallel-out shift registers, like the 74HC595 that are connected to the SPI bus.

Template Parameters

N	The number of bits in total. Usually, shift registers (e.g. the 74HC595) have eight bits per chip, so `length = 8 * k` where `k` is the number of cascaded chips.

Definition at line 29 of file SPIShiftRegisterOut.hpp.

Member Typedef Documentation

◆ BitOrder_t

using BitOrder_t = typename ShiftRegisterOutBase<N>::BitOrder_t

Definition at line 31 of file SPIShiftRegisterOut.hpp.

Constructor & Destructor Documentation

◆ SPIShiftRegisterOut()

SPIShiftRegisterOut	(	pin_t	latchPin = `SS`,
		BitOrder_t	bitOrder = `MSBFIRST`
	)

Create a new SPIShiftRegisterOut object with a given bit order, and a given number of outputs.

Multiple shift registers can be cascaded by connecting the serial output of the first one to the input of the second one:

SCK   >───────────┬──────────────────────┬───────── ⋯
          ┏━━━━━━━┷━━━━━━━┓      ┏━━━━━━━┷━━━━━━━┓ 
          ┃     SH_CP     ┃      ┃     SH_CP     ┃ 
MOSI  >───┨ DS        Q7S ┠──────┨ DS        Q7S ┠─ ⋯
          ┃     ST_CP     ┃      ┃     ST_CP     ┃ 
          ┗━━━━━━━┯━━━━━━━┛      ┗━━━━━━━┯━━━━━━━┛ 
CS    >───────────┴──────────────────────┴───────── ⋯

Parameters

latchPin	The digital output pin connected to the latch pin (ST_CP or RCLK) of the shift register.
bitOrder	Either `MSBFIRST` (most significant bit first) or `LSBFIRST` (least significant bit first).

Definition at line 13 of file SPIShiftRegisterOut.ipp.

Member Function Documentation

◆ begin()

void begin ( )

overridevirtual

Initialize the shift register.

Setup the SPI interface, set the CS pin to output mode, and set all shift register outputs to LOW.

Implements ExtendedIOElement.

Definition at line 17 of file SPIShiftRegisterOut.ipp.

◆ update()

void update ( )

overridevirtual

Write the state buffer to the physical outputs.

Implements ExtendedIOElement.

Definition at line 24 of file SPIShiftRegisterOut.ipp.

◆ pinMode()

void pinMode	(	pin_t	pin,
		uint8_t	mode
	)

inlineoverridevirtualinherited

The pinMode function is not implemented because the mode is OUTPUT by definition.

Implements ExtendedIOElement.

Definition at line 52 of file ShiftRegisterOutBase.hpp.

◆ digitalWrite()

void digitalWrite	(	pin_t	pin,
		uint8_t	val
	)

overridevirtualinherited

Set the state of a given output pin.

Parameters

pin	The shift register pin to set.
val	The value to set the pin to. (Either `HIGH` (1) or `LOW` (0))

Implements ExtendedIOElement.

Definition at line 13 of file ShiftRegisterOutBase.ipp.

◆ digitalRead()

int digitalRead ( pin_t pin )

overridevirtualinherited

Get the current state of a given output pin.

Parameters

pin	The shift register pin to read from.

Return values

0	The state of the pin is `LOW`.
1	The state of the pin is `HIGH`.

Implements ExtendedIOElement.

Definition at line 20 of file ShiftRegisterOutBase.ipp.

◆ analogRead()

analog_t analogRead ( pin_t pin )

inlineoverridevirtualinherited

The analogRead function is deprecated because a shift is always digital.

Parameters

pin	The shift register pin to read from.

Return values

0	The state of the pin is `LOW`.
1023	The state of the pin is `HIGH`.

Implements ExtendedIOElement.

Definition at line 90 of file ShiftRegisterOutBase.hpp.

◆ analogWrite()

void analogWrite	(	pin_t	pin,
		analog_t	val
	)

inlineoverridevirtualinherited

The analogWrite function is not deprecated because a shift is always digital.

Parameters

pin	The shift register pin to set.
val	The value to set the pin to. A value greater or equal to 0x80 will set the pin to a `HIGH` state, a value less than 0x80 will set the pin to a `LOW` state.

Implements ExtendedIOElement.

Definition at line 104 of file ShiftRegisterOutBase.hpp.

◆ red()

pin_t red ( pin_t id )

inherited

Get the red output pin of the given LED.

Parameters

id	The zero-based LED number.

Definition at line 36 of file ShiftRegisterOutBase.ipp.

◆ redPins()

Array< pin_t, N/3 > redPins ( )

inherited

Get an array containing all pins with red LEDs.

Definition at line 41 of file ShiftRegisterOutBase.ipp.

◆ green()

pin_t green ( pin_t id )

inherited

Get the green output pin of the given LED.

Parameters

id	The zero-based LED number.

Definition at line 25 of file ShiftRegisterOutBase.ipp.

◆ greenPins()

Array< pin_t, N/3 > greenPins ( )

inherited

Get an array containing all pins with green LEDs.

Definition at line 30 of file ShiftRegisterOutBase.ipp.

◆ blue()

pin_t blue ( pin_t id )

inherited

Get the blue output pin of the given LED.

Parameters

id	The zero-based LED number.

Definition at line 47 of file ShiftRegisterOutBase.ipp.

◆ bluePins()

Array< pin_t, N/3 > bluePins ( )

inherited

Get an array containing all pins with blue LEDs.

Definition at line 52 of file ShiftRegisterOutBase.ipp.

◆ pins()

Array<pin_t, N> pins ( ) const

inlineinherited

Get an array containing all pins of the element.

Definition at line 27 of file StaticSizeExtendedIOElement.hpp.

◆ length()

static constexpr uint16_t length ( )

inlinestaticconstexprinherited

Definition at line 31 of file StaticSizeExtendedIOElement.hpp.

◆ beginAll()

void beginAll ( )

staticinherited

Initialize all extended IO elements.

Definition at line 23 of file ExtendedIOElement.cpp.

◆ pin()

pin_t pin ( pin_t pin ) const

inherited

Get the extended IO pin number of a given physical pin of this extended IO element.

Parameters

pin	The zero-based physical pin number of this IO element.

Returns: The global, unique extended IO pin number for the given pin.

Definition at line 28 of file ExtendedIOElement.cpp.

◆ operator[]()

pin_t operator[] ( pin_t pin ) const

inherited

Get the extended IO pin number of a given physical pin of this extended IO element.

It is alias for ExtendedIOElement::pin.

Parameters

pin	The zero-based physical pin number of this IO element.

Returns: The global, unique extended IO pin number for the given pin.

Definition at line 43 of file ExtendedIOElement.cpp.

◆ getLength()

pin_t getLength ( ) const

inherited

Get the number of pins this IO element has.

Returns: The number of pins this IO element has.

Definition at line 45 of file ExtendedIOElement.cpp.

◆ getEnd()

pin_t getEnd ( ) const

inherited

Get the largest global extended IO pin number that belongs to this extended IO element.

Definition at line 47 of file ExtendedIOElement.cpp.

◆ getStart()

pin_t getStart ( ) const

inherited

Get the smallest global extended IO pin number that belongs to this extended IO element.

Definition at line 49 of file ExtendedIOElement.cpp.

◆ getAll()

DoublyLinkedList< ExtendedIOElement > & getAll ( )

staticinherited

Get the list of all Extended IO elements.

Definition at line 51 of file ExtendedIOElement.cpp.

Member Data Documentation

◆ latchPin

const pin_t latchPin

protectedinherited

Definition at line 149 of file ShiftRegisterOutBase.hpp.

◆ bitOrder

const BitOrder_t bitOrder

protectedinherited

Definition at line 150 of file ShiftRegisterOutBase.hpp.

◆ buffer

BitArray<N> buffer

protectedinherited

Definition at line 152 of file ShiftRegisterOutBase.hpp.

◆ dirty

bool dirty = true

protectedinherited

Definition at line 153 of file ShiftRegisterOutBase.hpp.

◆ start

const pin_t start

privateinherited

Definition at line 193 of file ExtendedIOElement.hpp.

◆ end

const pin_t end

privateinherited

Definition at line 194 of file ExtendedIOElement.hpp.

◆ offset

pin_t offset = NUM_DIGITAL_PINS + NUM_ANALOG_INPUTS

staticprivateinherited

Definition at line 195 of file ExtendedIOElement.hpp.

◆ elements

DoublyLinkedList< ExtendedIOElement > elements

staticprivateinherited

Definition at line 197 of file ExtendedIOElement.hpp.

◆ next

ExtendedIOElement * next

protectedinherited

Definition at line 305 of file LinkedList.hpp.

◆ previous

ExtendedIOElement * previous

protectedinherited

Definition at line 306 of file LinkedList.hpp.

The documentation for this class was generated from the following files:

Public Types

Public Member Functions

Static Public Member Functions

Protected Attributes

Private Attributes

Static Private Attributes

Detailed Description

template<uint8_t N> class AH::SPIShiftRegisterOut< N >

Member Typedef Documentation

◆ BitOrder_t

Constructor & Destructor Documentation

◆ SPIShiftRegisterOut()

Member Function Documentation

◆ begin()

◆ update()

◆ pinMode()

◆ digitalWrite()

◆ digitalRead()

◆ analogRead()

◆ analogWrite()

◆ red()

◆ redPins()

◆ green()

◆ greenPins()

◆ blue()

◆ bluePins()

◆ pins()

◆ length()

◆ beginAll()

◆ pin()

◆ operator[]()

◆ getLength()

◆ getEnd()

◆ getStart()

◆ getAll()

Member Data Documentation

◆ latchPin

◆ bitOrder

◆ buffer

◆ dirty

◆ start

◆ end

◆ offset

◆ elements

◆ next

◆ previous

template<uint8_t N>
class AH::SPIShiftRegisterOut< N >