Questions tagged [embedded-systems]

"An embedded system is a computer system designed for specific control functions within a larger system, often with real-time computing constraints." Michael Barr. "Embedded Systems Glossary". Neutrino Technical Library. Retrieved 2007-04-21, copied from Wikipedia.

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How should data be formatted between embedded device and app/cloud?

We have an embedded device collecting data from various sensors attached to it. The data is then passed to the application. What is the best way to design the data packets? The data needs to be ...
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132 views

How to use polymorphism in embedded software?

I have been developing a control software in C++. From the high perspective the control task can be basically divided into several subtasks calculate unmeasurable physical quantity based on dynamic ...
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2answers
86 views

Visitor design pattern usage

I have been implementing a software driver for an external (from my microcontroller point of view) chip communicating with my microcontroller over I2C. From the higher perspective the chip is a ...
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1answer
46 views

Methods for remote display of and embedded FreeRTOS devices display

I have a device that has a NXP MK66FN1M arm core processor with a black and white display. This device is running FreeRTOS with serial, usb, keypad, display, external FeRAM, wifi, and ethernet. What ...
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75 views

How to design software driver for the analog to digital converter?

I have been developing software driver for the analog to digital converter in C++. The a/d converter is primary intended for conversion of the temperature signals. The temperature signals are then ...
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Using a bulletin board to support Separation Of Concerns

Context: I'm working on an embedded system with many small functional modules. The business logic within each module is made as simple as possible, but those modules generally need to gather bits of ...
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1answer
40 views

Software driver for remote digital inputs

I have been facing a task to develop a software driver in C++ for a chip which makes available 8 digital inputs over the SPI bus. In the time being I have been thinking about the interface of the ...
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73 views

How to develop software drivers for the mcu peripherals in C++?

I have been developing a set of software drivers for the peripherals of a MCU. I need to implement those drivers in the C++ programming language. My idea was to model each driver by its own class. ...
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1answer
102 views

Ask for suggestion: data type for parsing stringified fractional numbers

I am the author of a C library for parsing INI files. So far I have delegated the task of parsing values as numbers to the standard atoi() family of functions. However I think time has come that I ...
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155 views

What is AUTOSAR? Is it a file structure?

I've gone through AUTOSAR Layered Software Architecture and understood that it is something like a file structure in which it is defined to have all the hardware abstraction in one directory and ...
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53 views

Modular design of authentication schemes for a http client

I want to make a httpClient wrapper that is able to use a predefined set of authentification methods: basic, digest, token (oauth), ntlm just to name a few that I will have to implement. My approach ...
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1answer
96 views

Array Declaration for Embedded System

I am developing a library for an embedded system with very little storage in C++. I would like to declare an array for a specific use in one function, however I am unsure if I should declare this in ...
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58 views

Designating a pin header and a GPIO

I have an Acconeer XB112 breakout board and an XM112 radar module. It all works just fine per the Acconeer documentation and tutorials. Now I want to modify some of the code to output to a GPIO. ...
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65 views

How to go from Simulink to embedded fixed-point DSP processor?

A library of audio algorithms is modeled, tested and verified in Simulink (graphical block diagramming tool). It needs to go from this existing Simulink models down to a multiple embedded platforms (...
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139 views

Is it possible to write unit tests for embedded systems with no prior embedded programming knowledge?

I have this question for a long time that is it possible for someone with no prior embedded systems programming experience to write unit tests? I have good knowledge of other languages like JAVA, ...
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Architecture Design of Command&Control application center for displays

I am facing dilemma on how to best design the following functionality. What design patterns and OOD principles should I use. For simplicity sake following are basic requirements: displays type ...
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5answers
775 views

How to deal with a lot of conditions in If statement in an elegant manner

Is there a more syntactically beautiful/simply better way to write the following (without major abstraction)?: if (usart_error.CRCError == true || usart_error.DMATransferError == true || ...
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2answers
214 views

Executable VS. Software image

Need your help to clarify primitive concepts: In an embedded system, when a program runs on the processor (ARM as an example), in my understanding that it is because the "code to be executed" is ...
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2k views

An older, experienced contractor used an SQLite DB for various queues - am I, a young dev, justified with feeling uncomfortable with it? [closed]

Context: I'm an embedded dev with only 2 years of solid experience. I'm the sole technical employee of a startup of 4 people. We have an MVP of our product out and are getting ready to develop the ...
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1answer
69 views

Developing and debugging code with a logic analyzer?

Until now I used Arduinos with shields and ICs and mostly I used libraries to communicate with i.e. ADC, DAC, Real Time Clock, etc. Now I want to do the same kind of programming with the same ICs ...
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1answer
345 views

One loop or MultiTasking with FreeRTOS in ESP32 project?

I programmed a CAN Bus logger for the ESP32 with ESP-IDF. Currently this is just one main program with one loop. In that loop data is read from the CAN-Bus receiver and written to one log file on a ...
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6k views

Can abstractions and good code practice in embedded C++ eliminate the need for the debugger?

I am a C developer for an embedded system. YouTube has recently started recommending "C++ for embedded systems" talks. Having watched some of them, they pique my interest, but none of them answer the ...
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1answer
166 views

Finding undefined behaviour in C for embedded system

I just started at a small company and there is a hot-needle-built software for micro controllers written in C which we are now starting to clean up to make it maintainable again. Of course this goes ...
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2answers
246 views

Should I separate send and receive methods into tasks for a CAN-BUS reader on ESP32?

I am developing a CAN-BUS reader (logger) with an ESP32 microcontroller. This sample uses RTOS and several task to send and receive CAN-BUS messages. https://github.com/espressif/esp-idf/tree/master/...
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793 views

How to connect IOT devices to Android App(initial connection) [closed]

Background I am starting a new project, and I want custom IOT sensors for an app I am writing. I want to keep everything as simplistic as possible so the IOT devices wont be running any major software ...
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1answer
414 views

Testable class/interface in embedded software written in C++

I would like to collect feedback on possible solutions for creating testable classes/interfaces. In a normal C++ development we can use references/pointers and forward declarations to achieve dynamic ...
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1answer
173 views

C++ pattern for compile-time configurable class functionality

Due to resource limitations (embedded), I want to make some functionality that a class provides optional. The decision to include this optional functionality should be made at compile time. For ...
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3answers
364 views

Best way to conditionally exclude unused code (C++03)

I'm working on a bare-metal embedded system, with a class that can be compiled for different hardware versions. The class takes in a pointer to a device and uses it, or takes in NULL if the device is ...
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1answer
80 views

How is a function in execute only space compiled?

I don't quite understand, how the following typedef is parsed by a compiler to call code at a specific address. I guess I understand that a function is just a pointer and we're typedefing such a ...
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1answer
128 views

Design approach for extending class functionality - Embedded C++

For my company i am refactoring our embedded C/C++ code base to increase re-usability for commonly used functionality. Currently i am refactoring our command line interface but i ran into a design ...
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2answers
270 views

Best way to model UTC time and deltas in embedded C

I'm getting ready to do some work on an embedded firmware prototype that has a GPS chip attached to it (straight C on an arm0, no OS). I'm torn on how to model UTC instants and time deltas. ...
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1answer
94 views

Board support driver for custom board - API design - MCU resource configuration

I have got to implement a board support package for a custom board, and I would like to know your opinion about the different approaches of designing board support drivers. My custom board pupulates ...
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2answers
447 views

Object Oriented vs. Procedural Processes in Embeded System

I'm currently developing a controller for an industrial application which takes data inputs from various sensors and interfaces (ethernet, serial, etc.), does some minimal processing, and adjusts ...
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1answer
532 views

How to abstract HAL in embedded test driven development?

Recently I've been reading into topic of test driven development and decided to give it a go with a sensor driver I need. Sensor uses SPI interface and I will implement this driver on STM32F415 ...
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2answers
937 views

Appropriate way to handle timezone for embedded/IoT devices

I am writing some data collection software (in python) that will transmit data to the cloud. I am including a timestamp (using the standard datetime module included with python) in the data record so ...
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1answer
242 views

Help defining architecture - async messaging; web app as portal in web page

I don't know if this is a legitimate architecture that I've been playing with. It consists of nodejs servers for services and to create web app front ends. And it is using async messaging (Redis) to ...
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1answer
784 views

Embedded software architecture - What is the difference between DAL and HAL?

I'd like to know what the difference is between hardware abstraction layer (HAL) and data abstraction layer (DAL) when speaking about embedded software. I might have the abbreviations wrong though... ...
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1answer
546 views

Embedded Systems: Designing an API that monitors an address

This question was tossed as a starting point in a technical interview at a semi-conductor company. I guess there are no right ans - the purpose of this open ended question is to gauge the engineer's ...
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116 views

How could an fresher start doing changes in thousand lines code immediately after joining? [duplicate]

Well I am newly graduated and placed in a small scale project based company. When I joined , the boss (project head) gave me project code for understanding what work I will be doing hence forth. I ...
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142 views

Unicode or font support for an embedded project

I am working on an project for development of an Embedded system with following requirements. Should be able to receive a text in English language from a Host device. Interfaced over Modbus. Should ...
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1answer
411 views

Handling error in multiple state machines in embedded systems in C

I have few state machines which run "concurrently" in a super loop. do { state_one(); state_two(); state_three(); /* The point I want to deal with the error */ } while(1); Each of these ...
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2answers
175 views

(System) Hooks for embedded libraries

With the inability to go into to much detail, imagine the following situation: You are developing a library that needs to run on various embedded platforms (AVR, ARM, etc..). Some functionality of ...
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1answer
738 views

Integration VS System Testing on Embedded system demo

My company develops embedded systems and they have a project where they are developing a new platform which will be used to do demos for potential clients. They are introducing a new technological ...
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1answer
501 views

Software Integration Tests Host vs Target

What criteria do you use to decide whether execute a test on target or on host in a sprint? We have integration testing using a server for an embedded system project. We are starting to learn and ...
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1answer
128 views

Multiple Integration Test Iterations for each sprint

We are going to implement Integration Testing at our project for an Embedded Product. The plan is to develop the Tests and execute them at each sprint. I suggested that the tests could be executed ...
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2answers
502 views

Module pattern in C with threading - where to control threads?

So I'm working on a growing C program in a Linux / POSIX environment, and I've run into an area where I'm not quite sure how to proceed. Basically, I'm using a module pattern to develop my code for ...
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2answers
598 views

Version control of embedded OS system image

I'm working on a hardware product that contains an embedded Linux system. The majority of what we execute on that system is a set of Python code which currently has its own Git repository and is ...
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1answer
808 views

What is so different about RTOS compared to normal programming?

Classical programs run a loop with prioritized ISRs. How do RTOS do this differently of better?
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1answer
152 views

Handling out of bounds requests in embedded C library

We're currently building a library in C that configures itself from tables in EEPROM. This leaves the possibility however that some caller requests a field that is out of bounds, and the question ...
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2answers
3k views

Static vs non-static in embedded systems [duplicate]

I am writing a C++ applications in the embedded area. A lot of times I think about should I use static or non-static const variable in the functions/methods? Here are my thoughts: Static constant ...