Digital_IO

Copyright (C) Simon Wright <simon@pushface.org>

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Contains the input-output domain Digital_IO for ColdFrame's House Management demonstration.

Contents

All classes

Class diagram for Digital_IO

Types


Types

Implementation_Class_P

This type is a class-wide pointer to the abstract type Implementation; the required concrete bottom half calls Register to connect itself to the top half.

Imported from Digital_IO_Support.

Implementation_Class_P has operations:

Register

The required bottom half calls Register to connect itself to the top half.

Parameters:

Impl : in Implementation_Class_P

Input_Signal

Numbers the input (switch) signal pins.

A constrained version of Integer from 0 to 15.

Input_Signal has operations:

Get returns Boolean

Returns the current state of the input signal for pin S.

Parameters:

S : in Input_Signal

Input_Signal_State

Provides application domains with callback facilities for input signal state changes.

Callback support is provided.

A record type, with attributes:

S : Input_Signal

The input signal that has changed.

State : Boolean

The state that the signal has changed to.

Output_Signal

Numbers the output (lamp) signal pins.

A constrained version of Integer from 0 to 15.

Output_Signal has operations:

Set

Sets the given output signal to the given state.

Parameters:

O : in Output_Signal
To_State : in Boolean