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Welcome to LabConnections.jl - the IO-software part of the LabDev project

The goal of this project is to develop a software package in Julia for interfacing with lab processes using either the BeagleBone Black Rev C (BBB) with custom IO-board cape, or the old IO-boxes in the labs using Comedi. With this package, the user is able to setup a connection between the host computer and the IO-device, and send and receive control signals and measurements from the lab process.

The full documentation of the package is available here.

Package Overview

The LabConnections.jl package is subdivided into two main modules; Computer.jl and BeagleBone.jl. Computer.jl defines the user interface on the host computer side, while BeagleBone.jl defines low-level types and functions meant to be used locally on the BBB.

BeagleBone.jl

This module defines types representing different pins and LEDs on the BBB, and functions to change their status and behaviour. There are currently 4 different types defined (each has the abstract super type IO_Object):

  • GPIO : Represents the BBB's General Purpose Input Output (GPIO) pins. Each instance will correspond to a physical GPIO pin on the board, and can be set as an input or output pin, and to output high (1) or low (0).
  • PWM : Represents the BBB's Pulse Width Modulation (PWM) pins. Each instance will correspond to a physical PWM pin on the board, which can be turned on/off, and whose period, duty cycle and polarity can be specified.
  • SysLED : Represents the 4 system LEDs on the BBB, and can be turned on/off. Used to perform simple tests and debugging on the BBB.
  • Debug : Used for debugging and pre-compilation on the BBB. It does not represent any physical pin or LED on the board.

Note: In addition to GPIO and PWM, the BBB also has pins dedicated for Serial Peripheral Interface (SPI). Work to feature this functionality in BeagleBone.jl is currently ongoing. More information can be found here

Computer.jl

This module contains the user interface on the host computer side, and defines types for devices/connections to the lab process, and filestreams between the host computer and different IO-devices (BBB or Comedi). There are currently 3 different device/connection types (each has the abstract super type AbstractDevice):

  • AnalogInput10V : Represents ±10V connections from the lab process to the IO-device. Each instance will correspond to a physical ±10V measurement signal from the lab process, whose value can be read.
  • AnalogOutput10V : Represents ±10V connections from the IO-device to the lab process. Each instance will correspond to a physical ±10V input signal to the lab process, whose value can be set.
  • SysLED : Represents the System LEDs on the BBB. Used for simple testing and debugging from the host computer side.

There are 2 different filestream types (each has the abstract super type LabStream):

  • BeagleBoneStream : Represents the data stream between the host computer and the BBB.
  • ComediStream : Represent the data stream between the host computer and the old IO-boxes using Comedi.

Getting Started

Installation

Running a Simple Example

Repository Structure

The package is subdivided into two main modules;