System.Hardware.Arduino.Parts.ShiftRegisters

Abstractions for shift-register IC parts.

Shift register abstraction

class ShiftRegister a where

A shift-register class as supported by the hArduino library.

Methods

size :: a -> Int

Capacity

name :: a -> String

Display name

dataSheet :: a -> String

Data sheet (typically a URL)

initialize :: a -> Arduino ()

Initialize the shift-register

disable :: a -> Arduino ()

Disable the output, putting it into high-impedance state

enable :: a -> Arduino ()

Enable the output, getting it out of the high-impedance state

clear :: a -> Arduino ()

Clear the contents

push :: a -> Bool -> Arduino ()

Push a single bit down the shift-register

store :: a -> Arduino ()

Store the pushed-in values in the storage register

read :: a -> Arduino [Bool]

Read the current value stored

Instances

ShiftRegister SR_74HC595

Supported shift-registers

Texas Instruments 7HC595

data SR_74HC595

The Texas-Instruments 74HC595 8-bit shift register with 3-state outputs. Data sheet: http://www.ti.com/lit/ds/symlink/sn74hc595.pdf.

This is a versatile 8-bit shift-register with separate serial and register clocks, allowing shifting to be done while the output remains untouched. We model all control pins provided. Note that the enable and clear lines are negated.

Constructors

SR_74HC595

Fields

serial :: Pin

Chip Pin: 14: Serial input

nEnable :: Pin

Chip Pin: 13: Negated output-enable

rClock :: Pin

Chip Pin: 12: Register clock, positive triggered

sClock :: Pin

Chip Pin: 11: Serial clock, positive triggered

nClear :: Pin

Chip Pin: 10: Negated clear-data

mbBits :: Maybe [Pin]

Chip Pins: 15, 1-7, and 8: Sequence of output bits, connect only if reading is necessary

Instances

ShiftRegister SR_74HC595