Questions tagged [avr]
AVR is the family of microcontrollers used in Arduino boards.
262 questions
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Help: convert Arduino code to avr-gcc code [closed]
I need to convert Arduino code to avr-gcc code. This is code:
#include <Servo.h>
Servo myservo;
void setup() {
myservo.attach(11);
}
void loop() {
myservo.write(67);
}
I use Arduino ...
4
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1
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How to convert Arduino example sketch to a complete c++ project?
I'm experimenting something new with my Arduino Leonardo. I removed its original bootloader and flashed it with LUFA mass storage example with added functionalities(now its a firmware). I'm trying to ...
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Using Arduino libraries for adding more functionalities to a bootloader
I have a short question to ask before putting time for research.
I have an Arduino Leonardo with the LUFA mass storage bootloader flashed. Now what I need to do is to add more functionalities to the ...
- 151
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How is the bootloader activated when device is running?
For the sake of specificity I am referencing my question to Arduino. It applies to all AVRs with hardware USB and a bootloader though.
The bootloader is capable of receiving new program data over the ...
polwel
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Programming ATMega328p using VP812 programmer (for AVR/Atmel chips)
I bootloaded an ATMega328p (the one that uses the basic Arduino bootloader). Then, I used the VP812 for dumping other programs written in C (in Atmel Studio).
The process of erasing, blank test, ...
Chetan Chavan
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4
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Reset and Remove Arduino ATmega328P?
So I have 2 Arduinos, and im wanting to remove the chip from one and reset it to like it came from the factory and then breadboard it and attempt to program it using an AVR programmer (Or maybe an ...
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Problem with uploading LUFA MassStorage .hex file to Leonardo
I have been trying to make my Leonardo board to work as a USB device. So I started with compiling the open source LUFA USB library demo "MassStorage" for the Leonardo board settings. Since I'm using ...
- 151
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8 bit arduinos: What happens to the data in registers during a function call? During an interupt?
If I have one function that uses registers heavily calling another that does the same thing, what happens? Does the data get destroyed? What, then, would happen on return to the first function? Is ...
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2
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Temperature sensor and LCD
I have a project which uses a DS18B20 temperature sensor and an LCD with an I2C interface on it. I have connected the sensor to my micro-controller (the DS18B20 has a 12-bit digital output) to the ...
- 125
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10 bit PWM on Arduino UNO
I am using this code to make 10 bit PWM on port number 9, it seems like everything printed is 0,1022 rather than printing 0, 512, 1023. Is there a problem in my code ?
I wired pin9 to A3 to get the ...
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Problem with microSD SPI mode in AVR
I'm trying to read a microSD block. But I don't know why it doesn't work.
I do:
CS_UP;
for(uint8_t i = 0; i <14; i++){ /* Send 74+ clocks */
spi_tranceiver(0xff);
}
_delay_ms(1); /* Wait 1 ms ...
- 111
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AVR timer overflow interrupt not working
My problem is an interrupt service routine (ISR) that seemingly never executes! Here's some info on my set up: I am flashing an avr attiny85. I have the bare bones of a project set up so far with ...
- 113
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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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Arduino uno board not detected when connected via USB no matter what OS
I was working with Arduino in Win 8.1, when suddenly it stopped work. I tried to reinstall the drivers and IDE several times, but it didn't solved.
In Win 8.1, when I plug the arduino, I get the pop ...
- 103
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Using Atmel Studio with Arduino Starter Kit (Uno MCU)
Can someone tell me if it's possible AND safe to use Atmel Studio with Arduino Starter Kit? I'm a newbie to firmware in general and I don't want to "brick" my Arduino Uno Microcontroller. I don't ...
- 157
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BASCOM-AVR stk500_2_ReceiveMessage(): timeout: -1
Arduino Uno R3
Windows 10
Bascom AVR
The ON is alright.
The LED flickers now and then.
The RX and TX flickers when I press the program button on Bascom but then disappears almost immediately.
...
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2
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996
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From Wiring to pure C
I'm using the Teensy 2.0 (atmega32u4) and decided to switch from Arduino IDE with Wiring to pure C. I think it's much more useful to master programming microcontrollers on that level. Wiring seems to ...
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AVR (Arduino Uno) Serial.print and Serial.println only printing 1 or 2 chars
I first used the Arduino IDE but now I'm using PlatformIO which is awesome. But I have some big trouble with Serial.print() and Serial.println(). To show this error I have the following example code:
...
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Atmega328p programming with Arduino libraries
I'm trying to use the serial communication to work between a naked AVR Atmega328p and a computer (OS X and Linux Ubuntu).
I can program the atmega (using a pololu programmer), I make it blink a LED ...
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Uploading .hex to ATTiny13 using Arduino
I would like to upload a .hex to ATTiny13V (or '13A) using Arduino Uno R3.
I think I know everything to do, but ATTiny13 ISP support and Arduino IDE is a bit search-and-find, and I have some grey-...
- 113
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Why can't the Atmel ATtiny family delay over a minute?
I have some really simple code and tested on an 8 MHz ATtiny85 and ATtiny2313. It's basically a blocking blink:
int relayPin = 7;
long offPeriod = 1 * 60 * 1000;
long onPeriod = 1 * 60 * 1000;
...
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Issues graduating to AVR-C [closed]
I'm trying to make the transition from coding in the Arduino language to AVR-C, but I'm having some issues with my microcontrollers.
I don't have an ISP, so I'm using one of my Arduino UNOs with the ...
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Is the Arduino bootloader really the Atmel bootloader? Can I use Flip to upload?
I've been asked to do a small project using an Ada BlueFruit board. It has a ATMega32U4. The 32U4 comes from the factory with a bootloader pre-installed. I've never used an Arduino before, but I have ...
- 332
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Complete Bread board arduino
I bought a ATmega328 microcontroller and burn the bootloader. Now I want to upload code directly from pc to the microcontroller on bread board. I have max232 ic for the communication but I recently ...
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5
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Good book/reference for AVR coding in pure C/C++?
Can someone recommend a good book/reference for going vanilla (i.e. not using arduino simplified language) on e.g. ATtiny85? I will need to use the equivalents of analogRead() and digitalRead() quite ...
- 348
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697
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Cannot enter programming mode on Arduino Uno
I have an Arduino Uno that I've been programming with an AVR Dragon through Atmel Studio 7.
I did two things in close proximity, and I'm not entire sure which action is the culprit. I tried using the ...
- 125
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does eeprom_write_block function of avr.eeprom.h writes a NULL terminated string or we have to manually null terminate it
http://www.nongnu.org/avr-libc/user-manual/group__avr__eeprom.html
I am trying to figure out that if we use eeprom_write_block function or eeprom_update_block function do we need to manually null ...
- 183
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Unable to replicate Arduino code into ATmega8 code
I am trying to replicate an LTC Audio Decoder code from Arduino Uno into AVR ATmega8 which I got from here.
My Arduino Uno code is working great. Here is my Arduino Uno code:
#define one_time_max ...
- 121
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Porting ATMega8 AVR based program to Intel Curie Processor
I'm currently trying to port a program called 'ArduinoUSBLinker' to work on my Arduino 101 (which has an Intel Curie CPU instead of the standard ATMega CPU).
The program is used to flash ESCs without ...
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5
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can homemade arduino be powered up with battery?
I am new to arduino. It is costly for me to buy an arduino uno board. Therefore I am going to make a Arduino with breadboard at my home. I also want to make my Arduino portable. Arduino Uno boards can ...
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IO Control and Configuration
I am using Eclipse to program a ATMega2560 and would like to stay away from the Arduino library, While looking through AVR Examples I have seen the syntax
#include <avr/io.h>
PORTD.0 = 1
or
...
- 468
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AVR has no vprintf_P?
Well this was unexpected. AVR libc has many the variants of printf, including vprintf, but is missing vprintf_P. Is this really just not present or implemented elsewhere?
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How to use printf with Arduino's serial ports without an intermediary buffer?
How to use printf with Arduino's streams without an intermediary buffer? The following seems unnecessary:
char buf[256];
sprintf(buf, ...);
Serial.print(buf);
Is there a way to connect HardwareSerial ...
- 480
3
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1
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Why am I only receiving the first address byte? (I2C Protocol)
Expecting the slave to ACKnowledge and return data, but it does not. This is my protocol. This is my Datasheet.
Also FYI I'm on an Arduino Fio but I am not inheriting the Arduino library.
#include &...
- 199
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How do I use SNAP protocol, correctly?
I've reviewed the documentation
I'm still a little lost when it comes to applying the functions. Each of the redundancy check methods take in an unsigned char and return an unsigned char.
Shouldn't ...
- 199
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How do I use an AtTiny85 (or other AtTiny) with Arduino?
Please mind that this is an "example" question.
How to make a "tiny arduino"?
I've ordered a bunch of ATtiny85's off E-bay, they're like tiny Arduino's.
I've set up the latest Arduino IDE and would ...
- 2,715
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Does Proteus simulate external interrupts properly using Arduino? I can't get them to work
I am trying to simulate an interrupt with an Arduino Uno in Proteus. This is the simple test code that I'm using:
void introutine()
{
digitalWrite(13,HIGH);
}
void setup()
{
pinMode(13,OUTPUT);
...
sebascarra
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1
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Using AVR Timer Within an ISR
I'm trying to create an ISR which operates for 15 seconds when a particular button is pressed. I'm attempting to use the AVR functions on my Arduino Uno to start counting when it enters the ISR, then ...
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Programming an ATtiny85
Recently I ordered some ATtiny85's from Jameco, and I've been trying to upload code to them through an Arduino Uno, following the instructions from this video on YouTube. I've been getting a lot of ...
- 137
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Error uploading to ATtiny
I followed Great Scott's video on YouTube for uploading to an ATtiny85. When I tried I got the following error messages:
Arduino: 1.6.7 (Windows Vista), Board: "ATtiny85 (internal 8 MHz clock)&...
- 137
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Timer/Counter programming Arduino
I'm trying to blink an LED on an ATMega328P (same MCU as Arduino I think..) using the internal timer but I'm stuck since it doesn't seem to light the LED at all....
#include <avr/io.h>
//#...
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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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341
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Switching LED on and off using microcontroller
I am new to microcontrollers and just become confused trying to solve the following problem:
An ATmega32 chip is connected to four on/off switches (SW0-SW3) and 4 LEDs (LED0-LED3). SWi is connected ...
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2
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where I can find ground? [closed]
there is AVR AVR ATmega32 and a board within.
there is outputs for all ports (A, B, C, D) on board, and Vcc.
the problem is - I have no external GND output.
to watch current - I should search for ...
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1
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313
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How to upload Arduino sketches to Atmel chips
I am new in this Arduino coding world and I was trying to make a project. I normally used Arduino Unos all the time, but I was facing a problem and that is that the Arduino Uno has only 13 digital ...
- 129
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1
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558
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In UART, what mechanism sets the "new data received" flag back to 0?
I was reading documentation on UART on AVR and it looks simple: when a flag (bit RXC0 of register UCSR0A) is set to 1, it means the micro controller has new data for you, and you read this from ...
- 131
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AVR - How to know that there is collision between stack and heap or the memory has filled?
I am using the dynamic memory in AVR microcontroller, so How to know that there is collision between stack and heap or if the memory has been filled?
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How to program AVR in Mac OS X?
In our college we are using a module developed by IIT Bombay (called FIREBIRD V[ver 5]). It has ATmega2560 and ATmega8 microcontrollers (master and slave) with bootloader.
The staff uses AVR Studio ...
2
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0
answers
112
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SPI Interface between Arduino UNO and EVK1100 [closed]
I'm using Arduino Uno board as master and AVR32UC3A0512 as slave. I've written code for arduino using SPI.h library, and Atmel Studio 6.2 using spi.h. I'm sending data from arduino to atmel i.e from ...
- 21
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1
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Why does my Arduino keep waking up?
This is my first post. Please excuse me if this is a repost, but I couldn't find a similar question via search.
I have some experience with Arduino and I'm looking to utilize AVR's sleep mode in a ...
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