Linux Simple I/O Library ======================== **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](https://wiki.analog.com/software/linux/docs/iio/iio) A/D (Analog to Digital) Converter Devices - [Industrial I/O Subsystem](https://wiki.analog.com/software/linux/docs/iio/iio) 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](https://www.labviewmakerhub.com/doku.php?id=learn:libraries:linx:spec:start) Devices - PWM (Pulse Width Modulated) Output Devices - [Remote I/O Protocol](http://git.munts.com/libsimpleio/doc/RemoteIOProtocol.pdf) Devices - Serial Ports - SPI (Serial Peripheral Interface) Bus Devices - [Stream Framing Protocol](http://git.munts.com/libsimpleio/doc/StreamFramingProtocol.pdf) 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](http://git.munts.com/libsimpleio/doc/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. - 18 March 2021 -- Modified the package building procedure to only install the absolute minimum files for the MuntsOS cross-compiled packages. An issue with `dpkg` installation script execution order may require you to run the following commands after upgrading to this version of **libsimpleio**: sudo find /usr/local -name '*-tmp' -exec rm {} ";" sudo apt install --reinstall munts-libsimpleio If you have previously installed the MuntsOS cross-compiled packages, you will also need to run one or more of the following commands: sudo apt install --reinstall gcc-aarch64-linux-gnu-muntsos-crosstool-libsimpleio sudo apt install --reinstall gcc-arm-linux-gnueabihf-muntsos-beaglebone-crosstool-libsimpleio sudo apt install --reinstall gcc-arm-linux-gnueabihf-muntsos-raspberrypi1-crosstool-libsimpleio sudo apt install --reinstall gcc-arm-linux-gnueabihf-muntsos-raspberrypi2-crosstool-libsimpleio - 25 March 2021 -- Added some rudimentary Python client support for the [Remote I/O Protocol](http://git.munts.com/libsimpleio/doc/RemoteIOProtocol.pdf) for raw HID servers (like [this](https://www.tindie.com/products/pmunts/usb-flexible-io-adapter) or [this](https://www.tindie.com/products/pmunts/usb-grove-adapter)), in response to a request from a customer who wants to develop a Python Remote I/O Protocol client program that can run on Windows 10 64-bit. Accomplishing this requires a new Windows shared library **`libremoteio.dll`**, which was written in the Ada programming language. It also contains the latest [hidapi](https://github.com/libusb/hidapi) code. Precompiled library files have been added to **`win/win64/`**. A few "proof of concept" Python3 programs are in **`python/`.** - 29 March 2021 -- The new **`libremoteio.dll`** also works with Visual Studio C++ programs. Added some Visual Studio C++ projects for creating Remote I/O Protocol client programs for 64-Bit Windows 10. - 20 April 2021 -- Added support to **`SERIAL_open()`** for more baud rates above 1000000 bps. Fixed issue with raw mode on Raspberry Pi serial ports. - 18 May 2021 -- Added support for stepper motors to Ada and .Net. Renamed **`basic/`** to **`mybasic/`**, **`modula2/`** to **`gm2/`**, and **`pascal/`** to **`freepascal/`**. Documentation ------------- The user manual for **libsimpleio** is available at [UserManual.pdf](http://git.munts.com/libsimpleio/doc/UserManual.pdf). The man pages specifying the **libsimpleio** API are available at [libsimpleio.html](http://git.munts.com/libsimpleio/doc/libsimpleio.html). Git Repository -------------- The source code is available at: Use the following command to clone it: git clone https://github.com/pmunts/libsimpleio.git Package Repository ------------------ Prebuilt packages for [Debian](http://www.debian.org) Linux are available at: [Make With Ada](https://www.makewithada.org/) Projects ------------------------------------------------------ - 2017 [Ada Embedded Linux Framework](https://www.makewithada.org/entry/ada_linux_sensor_framework) - 2019 [Modbus RTU Framework for Ada](https://www.hackster.io/philip-munts/modbus-rtu-framework-for-ada-f33cc6) (Prize Winner!) ------------------------------------------------------------------------ Questions or comments to Philip Munts I am available for custom system development (hardware and software) of products using ARM Linux or other microcomputers.