HC165 Class Reference

74xx165 Shift Register Class. More...

#include <74hc165.hpp>

Public Types
typedef std::vector< bool >	TData
	Type of Data buffer. More...

Public Member Functions
	HC165 ()
	Constructor. More...
	HC165 (uint plPin, uint clkPin=0xFF, uint cePin=0xFF, uint q7Pin=0xFF, uint nq7Pin=0xFF, uint pulseTime=kDefaultPulseTime)
	Constructor. More...
void	configure (uint plPin=0xFF, uint clkPin=0xFF, uint cePin=0xFF, uint q7Pin=0xFF, uint nq7Pin=0xFF, uint pulseTime=kDefaultPulseTime)
	Configures the HC165 class object. More...
void	chipEnable (bool value=true)
	Changes the Chip Enable pin of the HC165. More...
void	chipDisable (void)
	Disables the chip. More...
const bool	getCE (void) const
	Gets the Chip Enable status. More...
void	load ()
	Loads data into HC165. More...
bool	getBit (uint index=0)
	Gets a bit of the data loaded in HC165 units. Shifts data in units if need. More...
uint8_t	readByte (bool reverse=false)
	Reads a byte of the data loaded in HC165 units. Shifts data in units if need. More...
uint16_t	readWord (bool reverse=false)
	Reads a word of the data loaded in HC165 units. Shifts data in units if need. More...
uint32_t	readDWord (bool reverse=false)
	Reads a double word of the data loaded in HC165 units. Shifts data in units if need. More...
uint	readData (uint8_t *buffer, uint size, bool reverse=false)
	Reads data from the arbitrary HC165 units in cascade. Shifts data in units if need. More...

Static Public Attributes
static constexpr uint	kDefaultPulseTime = 1
	Default value to pulse time, in microseconds. More...

Detailed Description

74xx165 Shift Register Class.

The purpose of this class is to interface a 74xx165 Shift Register. Datasheet available on: https://tinyurl.com/bdzmty8v.

Member Typedef Documentation

TData

typedef std::vector<bool> TData

Type of Data buffer.

Constructor & Destructor Documentation

HC165() [1/2]

HC165

(

)

Constructor.

HC165() [2/2]

HC165	(	uint	plPin,
		uint	clkPin = 0xFF,
		uint	cePin = 0xFF,
		uint	q7Pin = 0xFF,
		uint	nq7Pin = 0xFF,
		uint	pulseTime = kDefaultPulseTime
	)

Constructor.

Constructs a new HC165 class object, and configures it.

Parameters

plPin	GPIO Pin number of ~Parallel Load.
clkPin	GPIO Pin number of Data Clock (default = 0xFF, no pin).
cePin	GPIO Pin number of ~Chip Enable (default = 0xFF, no pin).
q7Pin	GPIO Pin number of Q7 (default = 0xFF, no pin).
nq7Pin	GPIO Pin number of ~Q7 (default = 0xFF, no pin).
pulseTime	Pulse time, in microseconds (default = kDefaultPulseTime).

Member Function Documentation

configure()

void configure	(	uint	plPin = 0xFF,
		uint	clkPin = 0xFF,
		uint	cePin = 0xFF,
		uint	q7Pin = 0xFF,
		uint	nq7Pin = 0xFF,
		uint	pulseTime = kDefaultPulseTime
	)

Configures the HC165 class object.

Parameters

plPin	GPIO Pin number of ~Parallel Load (default = 0xFF, no pin).
clkPin	GPIO Pin number of Data Clock (default = 0xFF, no pin).
cePin	GPIO Pin number of ~Chip Enable (default = 0xFF, no pin).
q7Pin	GPIO Pin number of Q7 (default = 0xFF, no pin).
nq7Pin	GPIO Pin number of ~Q7 (default = 0xFF, no pin).
pulseTime	Pulse time, in microseconds (default = kDefaultPulseTime).

chipEnable()

void chipEnable

(

bool

value = true

)

Changes the Chip Enable pin of the HC165.

Parameters

value

If true, activate CE. Else, disables the chip.

chipDisable()

void chipDisable

(

void

)

Disables the chip.

getCE()

const bool getCE

(

void

)

const

Gets the Chip Enable status.

Returns

Value of Chip Enable ("software stored").

load()

void load

(

)

Loads data into HC165.

getBit()

bool getBit

(

uint

index = 0

)

Gets a bit of the data loaded in HC165 units. Shifts data in units if need.

Parameters

index

Index of bit (0..n). Default = zero.

Returns

Value of bit.

readByte()

uint8_t readByte

(

bool

reverse = false

)

Reads a byte of the data loaded in HC165 units. Shifts data in units if need.

Parameters

reverse

If true, reverses the bit order (Q0 to Q7). Otherwise (default), uses unit bit order (Q7 to Q0).

Returns

Value of byte (bits 0..7).

readWord()

uint16_t readWord

(

bool

reverse = false

)

Reads a word of the data loaded in HC165 units. Shifts data in units if need.

Parameters

reverse

If true, reverses the bit order (Q0 to Q7). Otherwise (default), uses unit bit order (Q7 to Q0).

Returns

Value of word (bits 0..15).

readDWord()

uint32_t readDWord

(

bool

reverse = false

)

Reads a double word of the data loaded in HC165 units. Shifts data in units if need.

Parameters

reverse

If true, reverses the bit order (Q0 to Q7). Otherwise (default), uses unit bit order (Q7 to Q0).

Returns

Value of word (bits 0..31).

readData()

uint readData	(	uint8_t *	buffer,
		uint	size,
		bool	reverse = false
	)

Reads data from the arbitrary HC165 units in cascade. Shifts data in units if need.

Parameters

buffer	Pointer to buffer to receive data. First is the LSB byte.
size	Size of buffer.
reverse	If true, reverses the bit order (Q0 to Q7). Otherwise (default), uses unit bit order (Q7 to Q0).

Returns

Size of readed data.

Member Data Documentation

kDefaultPulseTime

constexpr uint kDefaultPulseTime = 1

staticconstexpr

Default value to pulse time, in microseconds.

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

• 74hc165.hpp
• 74hc165.cpp