Soft::SRPI< N > Class Template Reference

#include <SRPI.hh>

Collaboration diagram for Soft::SRPI< N >:

Classes
class	InputPin

Public Member Functions
	SRPI (Board::DigitalPin sda=Board::D3, Board::DigitalPin scl=Board::D4, Board::DigitalPin pld=Board::D5)
bool	is_set (uint8_t pin)
void	is_clear (uint8_t pin)
void	update ()

Static Public Attributes
static const uint8_t	PINS = N * CHARBITS

Protected Attributes
uint8_t	m_port [N]
::InputPin	m_sda
OutputPin	m_scl
OutputPin	m_pld

Detailed Description

template<uint8_t N>
class Soft::SRPI< N >

Soft N-Shift Register Parallel Input. The shift registers (74HC165) may be cascaded for N*8-bit parallel input port (see circuit below). The pins are numbered from the first connect shift register (Q0..Q7) and updwards in the chain (Q8..Q15) and so on.

Circuit

                        74HC165    (VCC)
                      +----U----+    |
(D5/PLD)---+--------1-|/PL   VCC|-16-+
(D4/SCL)-+-)--------2-|CP    /CE|-15-----------(GND)
(Q4)-----)-)--------3-|D4     D3|-14------------(Q3)
(Q5)-----)-)--------4-|D5     D2|-13------------(Q2)
(Q6)-----)-)--------5-|D6     D1|-12------------(Q1)
(Q7)-----)-)--------6-|D7     D0|-11------------(Q0)
         | |        7-|/Q7    DS|-10-----------------+
         | |      +-8-|GND    Q7|--9--------(SDA/D3) |
         | |      |   +---------+                    |
         | |      |      0.1uF                       |
         | |    (GND)-----||-------(VCC)             |
         | |                         |               |
         | |            74HC165      |               |
         | |          +----U----+    |               |
         | +--------1-|/PL   VCC|-16-+               |
         +-)--------2-|CP    /CE|-15-----------(GND) |
(Q12)----)-)--------3-|D4     D3|-14-----------(Q11) |
(Q13)----)-)--------4-|D5     D2|-13-----------(Q10) |
(Q14)----)-)--------5-|D6     D1|-12------------(Q9) |
(Q15)----)-)--------6-|D7     D0|-11------------(Q8) |
         | |        7-|/Q7    DS|-10-----------------)--+
         | |      +-8-|GND    Q7|--9-----------------+  |
         | |      |   +---------+                       |
         | |      |      0.1uF                          |
         v v    (GND)-----||-------(VCC)                v

Parameters

[in]

N

number of shift registers (N * 8 input pins).

Definition at line 69 of file SRPI.hh.

Constructor & Destructor Documentation

template<uint8_t N>

Soft::SRPI< N >::SRPI ( Board::DigitalPin  sda = Board::D3, Board::DigitalPin  scl = Board::D4, Board::DigitalPin  pld = Board::D5  )

inline

Construct N-shift register connected to given pins.

Parameters

[in]	sda	serial input data (Default D3).
[in]	scl	serial clock (Default D4).
[in]	pld	load (Default D5).

Definition at line 80 of file SRPI.hh.

Member Function Documentation

template<uint8_t N>

void Soft::SRPI< N >::is_clear ( uint8_t  pin )

inline

Return true(1) if the given pin in shadow register is set, otherwise false(0).

Parameters

[in]

pin

pin number.

Returns

bool.

Definition at line 109 of file SRPI.hh.

template<uint8_t N>

bool Soft::SRPI< N >::is_set ( uint8_t  pin )

inline

Return true(1) if the given pin in shadow register is set, otherwise false(0).

Parameters

[in]

pin

pin number.

Returns

bool.

Definition at line 96 of file SRPI.hh.

template<uint8_t N>

void Soft::SRPI< N >::update ( )

inline

Update shadow register with value of shift registers. Parallel load and shift from register.

Definition at line 120 of file SRPI.hh.

Member Data Documentation

template<uint8_t N>

OutputPin Soft::SRPI< N >::m_pld

protected

Parallel load output pin

Definition at line 177 of file SRPI.hh.

template<uint8_t N>

uint8_t Soft::SRPI< N >::m_port[N]

protected

Shadow port register; LSB..MSB byte

Definition at line 168 of file SRPI.hh.

template<uint8_t N>

OutputPin Soft::SRPI< N >::m_scl

protected

Serial clock output pin

Definition at line 174 of file SRPI.hh.

template<uint8_t N>

::InputPin Soft::SRPI< N >::m_sda

protected

Serial data input pin

Definition at line 171 of file SRPI.hh.

template<uint8_t N>

const uint8_t Soft::SRPI< N >::PINS = N * CHARBITS

static

Number of pins for N ports

Definition at line 72 of file SRPI.hh.

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

• cores/cosa/Cosa/Soft/SRPI.hh