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Newest 'c' Questions - Arduino Stack Exchange
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Learn more about TeamsQuestions tagged [c]
C is a procedural programming language which is widely used in embedded systems. PLEASE NOTE: Arduino is typically programmed in C++, not C.
431 questions
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0
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1
answer
83
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0
votes
2
answers
65
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0
votes
1
answer
96
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Problem with char* variable malloc/free. Empty contents on recipient variable after using free
I am working on a custom SD card data logger using the following function and struct:
char *filenameCreator(const char *prefix, const char *num, bool addExtension)
{
char *filename = (char *)...
0
votes
1
answer
77
views
Serial com register formula
i am working on a atmega328p, learning to uses its registers instead a coding with common arduino code.
i've found this formula to get the baud rate on the Serial port (using USART protocol) :
how ...
-1
votes
1
answer
293
views
Declaration of global variables in separate file: compiler conflict
So I have:
1/ My myapp.ino file, that includes src.h (implemented in src.cpp). Compiled for Arduino Uno.
2/ I also have a unit-tests.cpp file that is meant to test functions in src.cpp. Compiled for ...
-1
votes
1
answer
502
views
SPI with DMA in a Arduino Due
I have a project where I need to store data (~16 Mo) on a memory and be able to fetch the data fast (<36000 bits/s) with DMA because I have other signals to take care of.
Currently I use an SD card ...
2
votes
2
answers
6k
views
How to use Interrupt in Arduino to receive the data from Serial Input
Currently i have a project that forced me to make a program that receives several data from Serial Input using Interrupt in Arduino. I use Arduino as the receiver and ESP32 as the sender through ...
1
vote
2
answers
485
views
Working with pulseIn() and millis()
I'm trying to use pulseIn with elapsed time using millis(), I don't want to use interrupts instead of pulseIn (I need pulseIn because I need accurate pulse time), the elapsed time doesn't need to be ...
4
votes
1
answer
644
views
Problem with reading data from ELM327
The idea was to create a bluetooth device on the arduino to read data from the machine (ELM327 v2.1) using the HC-05 bluetooth module.
In this code the bluetooth module is switched to MASTER mode and ...
1
vote
0
answers
114
views
Problem changing the state of the blue LED on an ESP8266
I am trying to change the blue LED on my ESP8266. I can do this (sort of...)
In the setupWifi() function below, there is a loop that is supposed to rapidly blink the LED while wifi is connecting. The ...
1
vote
0
answers
54
views
How to prevent the application code from getting stuck in forever loop when using SerialFlash library in Arduino-Adafruit framework
I have been working on a project that runs on Adafruit's Bluefruit nRF52 board. I used the SerialFlash library for Arduino provided by Paul Stoffregen: https://github.com/PaulStoffregen/SerialFlash....
2
votes
0
answers
174
views
TFT Screen with Arduino UNO does not display as expected
I have a 3.5" TFT LCD communicating in parallel connected to Arduino UNO.
I expect it draws a white circle on a black background but all it does is to show a white screen.
How to fix this?
main.c
...
2
votes
1
answer
271
views
How does the compiler/assembler work wrt bootloader?
I realized that on the atmega boards the bootloader is programmed into the chip.
I'm curious, when compiling a sketch how does the compiler/assembler differ from compiling a standard C program for a ...
0
votes
4
answers
1k
views
How to send multiple bytes with Wire without copying
When I need to send multiple bytes via Wire, for example a long int, I cast it to a byte array and specify a length
long int i;
Wire.write((byte*)&i, 4);
But if I want to send bytes from more ...
-1
votes
1
answer
368
views
How to write arduino code in a c/c++ script
I'm pretty new to arduino. But I have some knowledge about programming in c/c++. I know that arduino is written in c. But it can't be used as normal c/c++ code.
for example ,
instead of including some ...
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