Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [c++]

C++ is a compiled general-purpose programming language that adds object-oriented features and other enhancements to the C language, which it is largely a superset of. It is popular for both embedded and PC software development.

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Is C++ suitable for embedded systems?

A common question, here and elsewhere. Is C++ suitable for embedded systems? Microcontrollers? RTOSes? Toasters? Embedded PCs? Is OOP useful on microcontrollers? Does C++ remove the programmer too far from the hardware to be efficient? Should…
Toby Jaffey
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Programming languages for electronics engineers

I am an Electronics and Communications Engineering student, before I got to college, I have been interested in programming and computer applications. I had focused on designing Windows applications and learning its techniques, but now, I feel that…
Siraj Muhammad
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Avr-gcc using repeated addition instead of MULU instructions

I recently compiled some C++ code for the ATmega1284P in Atmel Studio and was analyzing the timings of some routines using my scope. To my surprise, a loop I thought I had optimized was taking longer than expected. After taking a peek at the…
Hackstaar
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C++ classes for I/O pin abstraction

I am looking for C++ abstractions for hardware I/O points or pins. Things like in_pin, out_pin, inout_pin, maybe open_collector_pin, etc. I surely can come up with such a set of abstractions myself, so I am not looking for 'hey, you might do it…
Wouter van Ooijen
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Microcontroller Sleep Race Condition

Given a microcontroller that is running the following code: volatile bool has_flag = false; void interrupt(void) //called when an interrupt is received { clear_interrupt_flag(); //clear interrupt flag has_flag = true; //signal that we have…
TRISAbits
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Version control of schematics and source code

I am developing an electronic device which has two parts: hardware (Eagle schematics) and firmware (C++ source code). I would like to track changes in both source code and schematics, but there are some points where I am not sure how to organize my…
Honza Vojtěch
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Arduino and Interrupts: Fast way to get pin values

I use an Arduino Uno and already set it up to work with interrupts on digital pins 2, 3, 4 and 5 according to an explanation1 I found. void setup() contains the following code to setup the interrupts. //Endable Interrupts for PCIE2 Arduino Pins…
madc
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Bug in Keil ARM compiler with interrupt handlers and C++?

I have a problem with writing interrupt handlers in Keil ARM compiler for LPC1114. When I write program in C++ and specify --cpp compiler option all code from interrupt handlers disappears, it is replaced with infinite loop. I wrote simple program…
x4mer
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Concept of the static keyword from the perspective of embedded C

static volatile unsigned char PORTB @ 0x06; This is a line of code in a PIC microcontroller header file. The @ operator is used to store the PORTB value inside the address 0x06, which is a register inside the PIC controller that represents…
Electro Voyager
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MCU programming - C++ O2 optimization breaks while loop

I know people says code optimization should only bring out the hidden bug in the program, but hear me out. I am staying on a screen, until some input via an interrupt is met. Here is what I see in the debugger. Notice the line inspected and the…
Daniel Cheung
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While loop optimized away

I have the following code in my microcontroler program: // Wait for ADC conversion to complete while ( ( ADCSRA && _BS( ADSC ) ) == _BS( ADSC ) ) {} Where ADCSRA is a register that will change its value once an analog conversion is completed and…
jippie
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STM32 interrupts and C++ don't go well together

I set up TIM3 to fire an interrupt in my project and it just wouldn't work. I tried everything I could and still couldn't find whats the problem. Then I created a clean project and copy/pasted only the code that sets up TIM3 and interrupts and it…
John
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How to enable c++11 support for Atmel Studio?

I am currently using Atmel Studio 7 and I need to enable c++11 support for it. I couldn't find any documentation about this topic. Moreover, I am not even sure it has c++11 support, yet.
ozgur
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Programming a parallel port as digital I/O

I'm trying to use a parallel port from a computer as a form of cheap digital output to do various things (control motors, light LEDs, read limit switches, ect). I want to know how to control the 8 data pins on a parallel port using C++, however…
Faken
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Can an ATmega or ATtiny device signature be read while running?

While programming an ATtiny or ATmega, avrdude prints the device signature, in this example it is an ATtiny. avrdude: Device signature = 0x1e910a Can I read this signature on a running device using C++ code (avr-gcc)? For ATmega1280 there is a…
jippie
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