Questions tagged [avr]
AVR is a 8- and 32-bit microcontroller core developed by Atmel. AVR was chosen as microcontroller for the first generations of the popular Arduino SBCs.
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What is a boot loader, and how would I develop one?
I've met many projects in which an AVR microcontroller uses with a bootloader (such as the Arduino), but I don't understand the concept very well.
How can I make a bootloader (for any microcontroller)...
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Complete alternatives to the Arduino IDE? [closed]
I'm not that big of a fan of the official Arduino IDE (in terms of visuals), so I've started looking for nicer alternatives. However, most of the projects I've found are in alpha/beta and are ...
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Why is AVR used in Arduino?
Why is Arduino using AVR? I understand that they are the official processor but there isn't a reason the code couldn't be ported to an ARM or a Freescale architecture other than cost, right? As long ...
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SPI or I2C: which to use for a longish bus
I'm contemplating a project that would require several AVRs talking to each other over a bus. They'd be separated by as much as 6 feet.
It seems like both I2C and SPI can let a series of micros ...
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Who receives the value returned by main()?
I know that in computers, value returned by the main() function is received by the operating system.
But, what happens in the ...
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Why does my AVR reset when I call wdt_disable() to try to turn the watchdog timer off?
I am having a problem where executing a disable watchdog sequence on an AVR ATtiny84A is actually resetting the chip even though the timer should have plenty of time left on it. This happens ...
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What is bit banging
I am new to microcontroller programming. I am using ATmega32-A controller and CodeVisionAVR compiler. I am using the waveform generator(AD9833) to generate a sinewave signal using SPI communication. I ...
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How do devices like the Game Boy Advance achieve their frame rate?
I've been designing my own handheld gaming device based around an AVR microcontroller and a small OLED display.
I started off with a monochrome display 128x64 pixels and can comfortably draw to it at ...
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A PCB for a Drone
I'm making a drone, and would love if somebody can review my work on the PCB layout.
Image (red is top, blue is bottom, circles indicate holes and side transfers purple is glue):
What is supposed to ...
user86234
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Due to overcurrent, shouldn't I be extremely cautious when setting an I/O pin as Output?
The question can be applied to any microcontroller with I/O capabilities, but I’m currently working with the popular ATmega328p. Consider the following circuit: A simple SPST Normally Open switch with ...
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Using the ATMega328 with the internal oscillator?
I have a project that I think would be best suited for an ATMega328P. However, in every simple project I've seen, people always hook up a 16MHz external oscillator. From what I can see, it should have ...
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What are Atmel Fuses?
What are Fuses in Atmel microprocessors and when I should or need to change the default settings?
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AVR - How to program an AVR chip in Linux
I recently got an AVRISP MkII AVR programmer, and I have an ATtiny85 and an ATmega328. I was wondering how I could program these chips with the programmer, but when I try getting Atmel Studio 6 it is ...
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ATMega8: why do VCC and AVCC have to be connected?
I often read that it is good practice to connect VCC with AVCC. Even in the ATMega8 datasheet it says so:
AVCC is the supply voltage pin for the A/D Converter, Port C (3..0),
and ADC (7..6). It ...
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Why are Atmel AVRs so popular?
A recent question asked about the advantages/disadvantages of various types of MCU. AVRs seemed not even worth a mention given the answers. Why then does it seem to an outsider that AVRs are ...