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Questions tagged [atmega]

ATmega is a product line within Atmel's AVR micro-controller family.

The official website can be found here.

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Arduino: Lightweight compression algorithm to store data in EEPROM

I want to store a large amount of data onto my Arduino with a ATmega168/ATmega328 microcontroller, but unfortunately there's only 256 KB / 512 KB of EEPROM storage. My idea is to make use of an compression algorithm to strip down the size. But…
RngTng
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Testing Code for Embedded Application

Background: I am developing a largish project using at Atmel AVR atmega2560. This project contains a lot of hardware based functions (7 SPI devices, 2 I2C, 2 RS485 MODBUS ports, lots of Analogue and Digital I/O). I have developed "drivers" for all…
Stephen Roe
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C - AVR - Simple PORTB, DDRB, PINB explanation

I am working on school project and need to learn the basics of C with a AVR atmega controller. I don't understand how everything is set up. For example PORTB, PORTD, DDRB; DDRD, PINB, PIND and stuff like that. And I don't know how everything works…
Mike_NotGuilty
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Arduino Uno PWM pins conflict

I built this motor shield based on the L298N chip to control two motors of a tank. It uses pins 5 and 6 for one motor, and pins 10 and 11 for the other. While trying to add a TSOP 4838 in order to control the tank with an IR remote I noticed that…
binar
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7 answers

ATMega328P "AVRDude: Could not find USBTiny Device (0x1781/0xc9f)"

Good afternoon, I recently assembled an ATMega328P based micro-controller PCB of my own design. I feel good about the circuit itself as I managed to upload the Arduino Blink sketch via the Sparkfun AVR Pocket Programmer. After uploading this sketch…
user3185748
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Pulse width modulation (PWM) on AVR Studio

I'm trying to use PWM for an LED on an ATmega8, any pin of port B. Setting up timers has been a annoying, and I don't know what to do with my OCR1A. Here's my code, and I'd love some feedback. I'm just trying to figure out how use PWM. I know the…
michaeljiz
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Arduino/AVR ATmega microcontroller, random resets, jumps or variable/data corruption

I thought many programmers of Arduino/AVRs MCUs could share some of knowledge. My specific problem was this: In my case on an Atmel Atmega128 AVR. Based on ADC data I was running a loop which was doing some calculations into serial console, also…
John
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Arduino Nano Timers

I want to know more about Arduino Nano timers. What timers are there? Do they produce interrupts? What code would attach an interrupt handler to them? How is delay() and delayMicroseconds() implemented... Do they use timer interrupts? (If so, how…
Jodes
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Schrödinger bug disappearing when breakpoint is set

I have a strange bug in my code which disappears when I try to debug it. In my timer interrupt (always running system ticker) I have something like this: if (a && lot && of && conditions) { some_global_flag = 1; //…
vsz
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Is it bad if all variables are defined as volatile on AVR programming?

I read that in some cases (global variable, or while(variable), etc.) if the variables are not defined as volatile it may cause problems. Would it cause a problem if I define all variables as volatile?
Johan Elmander
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what is the fastest algorithm for permutations of three condition?

Can anybody help me regarding quickest method for evaluating three conditions in minimum steps? I have three conditions and if any of the two comes out to be true,then whole expression becomes true else false. I have tried two methods: if…
shafeeq
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ATMEGA328p convert analog value to voltage

This is an extract of the official ATMEGA328p data sheet page 261: As the documentation say Vin * 1024 ADC = ---------- Vref What I don't understand is an analog pin can provide us 10bits. That's mean a value between 0x0 and 0x3ff…
Fpasquer
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ATmega328 + SPI Flash Memory

Preface: This question is about a project I am working on with a professor at my university. It is NOT for a grade, but my reputation with this professor does matter. So while my success on this project is important to me, I do not see it as unfair…
NickHalden
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Is a logical right shift by a power of 2 faster in AVR?

I would like to know if performing a logical right shift is faster when shifting by a power of 2 For example, is myUnsigned >> 4 any faster than myUnsigned >> 3 I appreciate that everyone's first response will be to tell me that one shouldn't…
Will
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Arduino as slave with multiple i2c addresses

I would like to use an Arduino as an i2c slave. But I require that the Arduino acts as multiple devices by registering itself with multiple i2c addresses. This is probably not something one would normally do, but here is my reason for doing it: I…
trojanc
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