Questions tagged [avr-gcc]

AVR-GCC is a compiler that takes C language high level code and creates a binary source which can be uploaded into an AVR micro controller.

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slower clock frequency than expected on attiny202

I am programming an attiny202 which as per datasheet can run up to 20Mhz, but after compiling/uploading this simple code to the attiny202 and watch the PA2 pin on the oscilloscope, I see that the pin ...
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1 answer
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How do I build and upload a C++ program without the Arduino Library or IDE?

Note: This is a reference question (but feel free to write answers of your own!) I want to use the AVR tools directly -- no arduino-builder or arduino-cli. I would also like compilation and uploading ...
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Do I need to use resisters and ICes for specific sensors.What if I dont use it,Will it impact my arduino board some how like making it useless &faulty

So I was reading about Simple AutomaticLight Controller using LDR. or with the help of LDRSenso. But I have LM393 Photoresistor (LDR) Sensor I like to know are they same thing or somewhat different. ...
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1 answer
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How to pass non-static class member to callback on avr platforms?

I am using the PubSubClient library in my own Arduino library. I'm having trouble with trying to assign a class member as the client library setCallback callback function. MyClass.cpp: #include <...
1 vote
1 answer
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Why do I have to burn the code to make it run? [closed]

Why do I have to burn the code twice to actually burn it on to the Arduino board? I have to execute this command twice - only then is the chip getting programmed. I'm using this command to burn the ...
1 vote
1 answer
178 views

Why my arduino board does not blink properly?

I have two files blink1.cpp typedef unsigned char int8_t; typedef volatile int8_t * volatile port_type; port_type portB = (port_type) 0x25; port_type ddrB = (port_type) 0x24; void delay_500ms() { ...
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1 answer
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AVRdude does not read the FUSE byte values correctly

I am exploring the ATmega328p MCU via a standard Arduino UNO, with the help of avr-gcc toolchain and AVRdude (All in the WINAVR package). I have successfully programmed the board a few times with it. ...
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2 votes
3 answers
206 views

How can I control blinking of LED while in timer function?

When I am in the 30-second standby function, I want to turn the LED on and off at 5-second intervals. How can I do what I want using the read_counter() function? The problem here is that I am already ...
2 votes
2 answers
1k views

Own type definition using a struct does not name a type

I need to initialize several buttons and LEDs connected to my Arduino. To store data related to an individual button or LED, I decided to define my own data type using two different structs. One for a ...
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926 views

Interleave disassembly + source with avr-objdump

I have a C program for the attiny85, that I want to disassemble and display with interleaved source code. Here's my program: test.c #include <avr/io.h> int main() { for(int i=0; i<100; ...
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2 answers
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Weird assembly output

I was taking a look at the disassembly for a loop of mine that seemed to be taking too long and I found these assembly instructions that I don't understand. Why does it load 0 into r25 and then do two ...
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Gratuitious instantiation of `Serial`, why?

Let's take a very simple sketch, any simple one-.ino sketch. Say, just a led blinker like this void setup() { pinMode(LED_BUILTIN, OUTPUT); digitalWrite(LED_BUILTIN, LOW); } void loop() { ...
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1 answer
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Reading port register and print

I am playing with port registers directly to improve speed on a Arduino micro. I have no problem writing them, like PORTF &= B11101111 However, when I try to read and print it, things get funny ...
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C++ State Machine / Wpmf-convesion

I'm quite a newbie using C ++. I am trying to implement in C ++, the state machine described in this link for C language: https://barrgroup.com/Embedded-Systems/How-To/Coding-State-Machines. I have ...
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Error Compiling any coding in Arduino IDE

I was using the example code of "Blink", and when I try to compile it, it pop out an error as below. I tried to: uninstall and installed back the Arduino IDE installed different versions of Arduino ...
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1 answer
1k views

Error Compiling sketch for Arduino Uno(ld return 1)

I have got an telnet server with esp8266 + SoftwareSerial+ UNO, and here I want to on led with command ON . will be 1 or 2. It is for recive 1 or 2 numbered pins. And I extract pin from request with ...
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2 answers
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Atmega collecting and relaying interrupt calls

I like to collect all possible interrupt and relay them to an alternative handler interrupt table what the user can set. In order to do this i have to: 1) collect all/any interrup request 2) ...
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3 answers
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DigiSpark AT Tiny85 compile problem?

Friend asked me to find problem with compilation for his DigiSpark AT Tiny85 board. We are trying to compile sketch from here: https://forum.arduino.cc/index.php?topic=314773.0 But with no luck - ...
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1 answer
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AVR-GCC can't call function located on fixed address

I wrote the following code: #include <avr/io.h> __attribute__((noinline, section(".app_start"))) void app_start() //app_start section starts at 0xFA0 { //register_packet_dispatch(...
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1 answer
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compilation error when changing variable from char to String

I have a code with these two lines: char handshakecode = "S"; // Capital S char receive; The lines of code are placed in a separate void, and not setup or loop. When i change the two variables ...
2 votes
2 answers
93 views

Weird behavior (Couldn't pull the pin LOW)

I was trying to implement my own code to control a stepper motor on arduino uno, however I noticed that the pins were always HIGH despite what was written to them. I started to erase the code to leave ...
5 votes
4 answers
201 views

Where in datasheet is the warning about unreliability of reading PINxn?

I use atmega32u4 (but believe it applies to all models). Here is the datasheet. Consider the following C program (I use AVR-GCC 5.4.0): #include <avr/io.h> int main(void) { PORTB |= 1 <&...
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1 answer
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How would I include Arduino libraries using AVR-gcc without the IDE?

I am writing my own code for the Arduino Uno. I compile my code with AVR-gcc, and then upload it with AVRdude. I am not using the Arduino software, but I do have it installed and working on my PC. I ...
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0 votes
1 answer
2k views

Timer0 overflow interrupt not working

I try to use the Timer0 of an Arduino Leonardo (ATmega32u) to trigger an interrupt at regular intervals, using plain avr-gcc (not the arduino library). I try to blink the built-in LED as test, but it ...
2 votes
1 answer
277 views

How does the build process in Arduino IDE work for ESP8266

How does the build process for esp8266 work in arduino IDE. Arduino ide uses avr-gcc to compile programs For atmel micro controllers. Does it uses same for compiling programs for esp8266?
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avr/io.h No such file or directory error when compiling using avr-gcc

I am trying to use the atmega328p as standalone microchip and program it. I ama using an Arduino Uno as ISP. I have written a simple program to test it however when I try to compile it using avr-gcc ...
1 vote
0 answers
248 views

AVR-Toolchain for Arduino crashes on Mac OSX 10.11.6: Hints or debugging help needed

My Arduino IDE does not compile any project since I updated from Mac OSX 10.6.8 to 10.11.6. I even tried reinstalling and also manually installing the original AVR-toolchain. But the behaviour did ...
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-1 votes
3 answers
831 views

avrdude flash issues

I want to burn a hex file to a custom ATmega2560 board. I use this USBasp programmer for flashing (firmware version 1.01) on my Mac OS X 10.12.6 system. All hex files are compiled with avr-gcc (GCC) 4....
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Bootloader fails when two Arduinos are connected over serial port

I’d like to connect two Arduinos over serial port so that they can communicate with each other. Initially, I put all necessary code onto one device and now connected another via serial port. As soon ...
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-1 votes
1 answer
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Error compiling code for Arduino/Genuino Uno

Arduino: 1.8.6 Hourly Build 2017/10/20 02:33 (Windows 10), Board: "Arduino/Genuino Uno" c:\users\hp\desktop\arduino-nightly\hardware\tools\avr\bin../lib/gcc/avr/4.9.2/../../../../avr/bin/ar.exe:...
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2 answers
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Building mocoLUFA under OSX & Linux

I am attempting to build mocoLUFA under OS X el Capitan 10.11.6. [Editor: mocoLUFA (MIDI firmware for Arduino Uno)] I am using the specified LUFA version (LUFA101122) and I have tried building with ...
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1 answer
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UECIDE: linker error with U8g2 library

This sketch: #include <SPI.h> #include <Wire.h> #include <U8g2lib.h> // OLED display. U8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE); void setup()...
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2 votes
2 answers
1k views

programming arduino in pure c

I'm trying to flash pure c-code to arduino Mega2560 board from linux using avr-gcc & avrdude. Compilation is done , now trying to flash using avr-dude, getting error as "avrdude: stk500_recv(): ...
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2 votes
3 answers
1k views

Compiling code via terminal

How can I compile my code via terminal? I am working on a Chrome app that allows you to write, compile, and upload code to an Arduino, and I need to know this so I can use the command line compiler on ...
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1 answer
1k views

Melzi 2.0 Board Firmware Upload problem

I'm trying to flash the repetier Firmware to my Prusa i3 3D Printer, which uses Melzi 2.0 board. I uploaded it successfully 2 days ago with same settings but now is failing always. @avrdude -p ...
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1 vote
1 answer
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Volatile variable not updating from timer ISR

I know this is a problem that has come up many times but I can't seem to get this code fragment to update the count variable on an ATMEGA328P. I am using an Arduino Uno as a development board, with ...
1 vote
1 answer
186 views

Compiling Error

I am trying to compile this code on arduino IDE...It showing error code is #include <IRremote.h> int RECV_PIN = 6; int led = 12;//1FE50AF int led1 = 10;//1FED827 int led2 = 9; //1FEF807 int ...
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1 answer
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avr-gcc -D is ignored

Im trying to use XCode to compile avr program with arduino libs but seems like something wrong with my Makefile because it throws me warnings like # warning "F_CPU not defined for <util/delay.h&...
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1 answer
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How to detect Genuino 101 from inside the code?

I am using a custom library for Arduino Mega which uses AES library for AES-128 encryption. However, when I try to use that library in Intel Genuino 101 development board, it shows compilation error ...
12 votes
2 answers
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Will a .ino Arduino Sketch compile directly on GCC-AVR?

Okay, we all have seen those questions all over the web such as Arduino v.s. C++, or other similar questions. And a vast majority of the answers do not even touch compilation differences other than ...
2 votes
2 answers
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Since double and float represent the same data type (usually), which is preferable?

It looks like on ATMega based boards, float and double are equivalent 32-bit (4-byte) data types. However, on the Arduino Due, doubles are 64-bit (8-byte) where floats are 32-bit (4-byte), same as ...
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2 votes
1 answer
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Compilation error using arduino-mk on arch Linux (undefined reference to __dso_handle)

I'm compiling a simple sketch that reads values from an analog input and activates a buzzer on a digital input. working on an Arduino uno. the sketch compiles and runs fine on windows and arch linux ...
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5 votes
2 answers
154 views

Trouble with Timer 0

I'm taking my first wobbly steps outside the Arduino IDE and I'm not having much success with timers / interrupts. I can set a pin to output and light an LED with registers fine but I cannot for the ...
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3 answers
223 views

Why atmega168/328p starts to reset?

First we set fuse bits: avrdude -c usbasp -p atmega328p -U lfuse:w:0xFF:m -U hfuse:w:0xDF:m -U efuse:w:0x07:m # same for atmega168 In the following examples we use the following commands to compile ...
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1 answer
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Why serial communication does not work on atmega168/328p?

I expect from the following program serial.c to light the led on if I send key 1 from terminal, and light the led off when I send key 0 from terminal: #define F_CPU 16000000UL #define BAUD 9600 #...
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516 views

Question about include statements and details in Arduino.h file from core library

This is more of a C/C++ question. However the files I am asking about are a part of the Arduino library. In /arduino-1.6.5-r5/hardware/arduino/avr/cores/arduino/Arduino.h : #ifndef Arduino_h #...
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Running Arduino code for Bluefruit LE on bare ATMega328

I need to hook up Bluefruit LE Breakout (nRF8001-based) to ATMega328 chip (to use it as wireless UART), and it seems like the library provided is for Arduino. What I have is just bare ATMega328 (note ...
2 votes
1 answer
984 views

avr-g++ (or avr-gcc) and LiquidCrystal library

I'm trying to run a simple Hello World program from Arduino 1.6.5 from terminal. When I run it in Arduino IDE, it works good. When I'm trying to get it by avr-g++ I have hard way to figure out how to ...
1 vote
1 answer
1k views

undefined reference to `PPMintIn::PPMintIn(int)'

I am making a new library that will utilize PinChangeInt's library. My intention is to further simplify repetitive code by creating a library. (This is to allow for multiple PPM channels without ...
1 vote
2 answers
428 views

New Language - Interfacing with AVR

So I'm taking a class where the project is to create a new embedded language. We are using OCaml for the compiler, so I was looking for a way to interface with AVR or its C library in such a way as I ...