Linux Simple I/O Library

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libsimpleio is an attempt to encapsulate (as much as possible) the ugliness of Linux I/O device access. It provides services for the following types of I/O devices:

Industrial I/O Subsystem A/D (Analog to Digital) Converter Devices
Industrial I/O Subsystem D/A (Digital to Analog) Converter Devices
GPIO (General Purpose Input/Output) Pins
Raw HID (Human Interface Device) Devices
I²C (Inter-Integrated Circuit) Bus Devices
Labview LINX Remote I/O Devices
PWM (Pulse Width Modulated) Output Devices
Remote I/O Protocol Devices
Serial Ports
SPI (Serial Peripheral Interface) Bus Devices
Stream Framing Protocol Devices
TCP and UDP over IPv4 Network Devices
Watchdog Timer Devices

Although libsimpleio was originally intended for Linux microcomputers such as the Raspberry Pi, it can also be useful on larger desktop Linux systems.

The C wrapper functions exported by libsimpleio all follow the same uniform pattern:

All C wrapper functions are proper procedures (void f() in C).
All input arguments of primitive types (int, float, etc.) are passed by value.
All output arguments of primitive types are passed by reference (int *, float *, etc.).
All composite types are passed by reference.
int32_t is used wherever possible for int and bool arguments.

All of the C wrapper functions are declared between _BEGIN_STD_C and _END_STD_C for C++. Binding modules are provided for Ada, C#, Java, and Free Pascal. Additional source code libraries are provided for Ada, C++, C#, Java, and Free Pascal that define OOP (Object Oriented Programming) classes for libsimpleio.

Quick Setup Instructions for the Impatient

Instructions for installing libsimpleio are found in UserManual.pdf, on pages 5 and 6.

News

10 February 2021 -- Added support for GPIO output pins implemented using PWM outputs. This is useful for controlling an ON/OFF device such as an LED or solenoid valve driven by PWM output.

Documentation

The user manual for libsimpleio is available at UserManual.pdf.

The man pages specifying the libsimpleio API are available at libsimpleio.html.

Git Repository

The source code is available at:

https://github.com/pmunts/libsimpleio

Use the following command to clone it:


git clone https://github.com/pmunts/libsimpleio.git

Package Repository

Prebuilt packages for Debian Linux are available at:

http://repo.munts.com/debian10

Make With Ada Projects

2017 Ada Embedded Linux Framework
2019 Modbus RTU Framework for Ada (Prize Winner!)

Questions or comments to Philip Munts phil@munts.net

I am available for custom system development (hardware and software) of products using ARM Linux or other microcomputers.