Peripheral Interaction Without a Linux Device Driver Using Spidev

Mohammed Billoo November 20, 2022
Overview

When integrating a new peripheral onto an embedded Linux platform, we might think we always need to implement a kernel module to serve as a device driver. However, as we all know, absolutes such as “always” and “never” are rarely true. The same is true in this case. Implementing a device driver in kernel space on an embedded Linux platform should only be undertaken if the performance requirements of the final application demand it. In most instances, a userspace...


Getting Started With Embedded Linux - From Nothing To A Login Prompt

Mohammed Billoo September 28, 2022

One of the famous observations that have been made related to embedded systems is referred to as “Moore’s Law”, which states that the number of transistors in integrated circuits doubles every year. This observation has held mostly true for the past several decades, so powerful CPUs are no longer simply relegated to servers, desktops, and laptops. Instead, we see powerful CPUs with increased capabilities being introduced into embedded systems on devices that live at “the edge”....


Examining The Stack For Fun And Profit

Steve Branam February 19, 20201 comment

Well, maybe not so much for profit, but certainly for fun. This is a wandering journey of exploration and discovery, learning a variety of interesting and useful things.

One of the concerns with an embedded system is how much memory it needs, known as the memory footprint. This consists of the persistent storage needed for the program (i.e. the flash memory or filesystem space that stores the executable image), and the volatile storage needed to hold the data while executing over long...


Linux Kernel Development - Part 1: Hello Kernel!

Denis Cavalli June 2, 20192 comments

Our very first program in every language or framework usually is the notorious "Hello World" program. For this Linux Kernel Modules Development introduction we will follow the same concept, but instead of the usual "Hello World" we will make a "Hello Kernel!" and you will understand the reason in a few moments. Note that in this article I will not focus on a deep explanation about this topic for the moment, since this is only the introduction.

But before we dive into code we need to have the...


Off the shelf availability of Custom IoT Gateway

Prasan Dutt May 12, 2019

Any IoT implementation requires a gateway. Since most industrial gateways comes at a price above average, choosing a right gateway for your new IoT requirement could be a daunting task. With the advancement in IIoT, several segments of industry use cases are popping up and each with their unique requirements. For example, condition monitoring of a thermal power plant, predictive maintenance of factory heavy machinery and asset tracking of containers in a shipping yard etc. Every such...


How to Give Persistent Names To USB-Serial Devices on Ubuntu 14.04

Dr. Tayyar GUZEL May 22, 20171 comment

If you have a bunch of USB-serial devices connected to your dock station and you needed to bind your USB-serial devices under static names so that all the USB-serial devices don't get to be assigned to random names by "udev" manager when you re-plug your laptop to the dock station, follow the instructions below. I will share the udev rules I created as a reference and give the step by step instructions to achieve persistent naming. All the steps worked on my Ubuntu 14.04...


Vala applications on Embedded Linux: maybe a clever choice [part 1]

Felipe Lavratti December 19, 2016

Vala is a sexy, open source, high level programming language that appeared in 2006, it counts with a modern typing system, is object oriented, compiled and statically typed, it has a almost identical syntax to C# and is maintained by GNOME. The language was created as a power abstraction of the GLib and GTK libraries, two considerably lightweight and powerful libraries written in C, and it is used in projects such as GNOME Clocks, Shotwell, GXml and Elementary OS.

namespace...

Surprising Linux Real Time Scheduler Behavior

Matthew Eshleman November 5, 2016

I have recently been helping with embedded software design and development for a data acquisition and visualization device. The software executes within an embedded Linux context and consists of various animated user interfaces rendering the acquired data.

The data is received via a UART and a SPI connection. During project development we noticed poor UART data latency issues during heavy user interface animations. For this product to properly meet its acquisition requirements, the UART...


Using the Beaglebone PRU to achieve realtime at low cost

Fabien Le Mentec April 25, 20148 comments
Introduction

I work as an engineer in a synchrotron facility. A few weeks ago, I helped the people in charge of the power supply developments to integrate a realtime control algorithm on a prototype platform: a BeagleBone Black (BBB) running Linux. I had already worked with this board in the past, and I found it very interesting given its excellent resources versus price ratio (around 40 euros). This time, I was impressed by its realtime capabilities. I thought it would be a good idea to...


Using the C language to program the am335x PRU

Fabien Le Mentec June 7, 201481 comments
Introduction

Some weeks ago, I published an article on how we used the PRU to implement a power supply control loop having hard realtime constraints:

//www.embeddedrelated.com/showarticle/586.php

Writing this kind of logic in assembly language is not easy. First the assembly language itself may be difficult to learn depending on your background. Then, fixed and floating point arithmetics require lot of code. While macros help to handle the complexity, they still are error prone as you...


An overview of Linux Boot Process for Embedded Systems

Kunal Singh December 25, 200811 comments

This Text provides an insight in to the Embedded Linux Boot Process. Reader should have a basic Knowledge of Boot Process in general and should be familiar with Embedded Linux Boot Process.

.................PART-A................(1) Software components Involved in Embedded Linux Boot Process    (a) Bootloader    (b) kernel Image    (c) root file system - either an initrd image or a NFS location(2) Steps during Booting process of a conventional...

Interfacing LINUX with microcontrollers

Fabien Le Mentec May 7, 20132 comments
Introduction

I am increasingly asked to work on small spare time projects where a user needs to control some device over the INTERNET. Recently, a friend needed to control heater relays and measure the temperature of its geographically distant secondary house. Another case relates to the control of a pan tilt home monitoring camera. A last one is the control of an old XY plotter DACs.

In both applications, the user wants to access the system over a web browser using HTTP. From the user...


How to Give Persistent Names To USB-Serial Devices on Ubuntu 14.04

Dr. Tayyar GUZEL May 22, 20171 comment

If you have a bunch of USB-serial devices connected to your dock station and you needed to bind your USB-serial devices under static names so that all the USB-serial devices don't get to be assigned to random names by "udev" manager when you re-plug your laptop to the dock station, follow the instructions below. I will share the udev rules I created as a reference and give the step by step instructions to achieve persistent naming. All the steps worked on my Ubuntu 14.04...


How to install Ubuntu 12.04 Precise, Xubuntu-desktop and Open JDK-7 on Beagleboard Rev. C2

Dr. Tayyar GUZEL July 25, 20124 comments

My aim was to install Ubuntu 12.04, Xubuntu-desktop graphical user interface and Java virtual machine (Open JDK-7) on my beagleboard so that I could run my java application on the monitor connected to the BB. I encountered several problems and solved them one by one. Following is how I've done it..

I had all the accesorries for the beagleboard (usb hub, dvi-to-hdmi cable, usb-ethernet converter, usb keyboard, usb mouse and a hdmi enabled monitor).

My host PC also has a Ubuntu 12.04...


Linux Kernel Development - Part 1: Hello Kernel!

Denis Cavalli June 2, 20192 comments

Our very first program in every language or framework usually is the notorious "Hello World" program. For this Linux Kernel Modules Development introduction we will follow the same concept, but instead of the usual "Hello World" we will make a "Hello Kernel!" and you will understand the reason in a few moments. Note that in this article I will not focus on a deep explanation about this topic for the moment, since this is only the introduction.

But before we dive into code we need to have the...


Examining The Stack For Fun And Profit

Steve Branam February 19, 20201 comment

Well, maybe not so much for profit, but certainly for fun. This is a wandering journey of exploration and discovery, learning a variety of interesting and useful things.

One of the concerns with an embedded system is how much memory it needs, known as the memory footprint. This consists of the persistent storage needed for the program (i.e. the flash memory or filesystem space that stores the executable image), and the volatile storage needed to hold the data while executing over long...