A company that makes microcontrollers and other chips, most popularly the AVR line of ATMega and ATtiny. These chips are the basis of the popular Arduino line of prototyping platform boards.

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UART: two transmitters, single slave

simulate this circuit – Schematic created using CircuitLab My circuit is shown above - where I have the TXD pin of an ATMEGA connected to the RXD pin of a BT slave. Both devices operate ...
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17 views

What is the real ADC Sample rate for Xmega256A3BU or similar xmega controllers

Based on the datasheet of XMEGA controllers, it has sample rate up to 2Msps (2MHz sampling speed). But it is also written that the conversion time for 12-bit need 3.5µs which gives ca. 300 KHz real ...
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35 views

ATMEL AT89S52 programmer help finding suitable software for flashing over LPT

I have this old ATMEL programmer and I'm hoping to start learning about micro controllers on a lower level before I move to Arduino. Unfortunately the floppy disk that came with it is lost, and the ...
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29 views

Is it practical to develop for Atmel Cortex-M0+ with gnuarmeclipse?

Is it practical to develop for Atmel's Cortex-M0+ microcontrollers using gnuarmeclipse and openocd instead of Atmel's IDE?
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25 views

Windows 8 does not recognize AT90USB647 and does not find drivers for it

Basically my problem is that Windows 8 does not recognize the microcontroller (AT90USB647) and cannot find drivers for it. As a result, I cannot burn a hex file into the microcontroller (using Flip). ...
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32 views

What is the purpose of the statistics register present in the EMAC of the DMA in ATMELSAM3x8e controller?

At present, I am working on interfacing the EMAC module with my SAM3x - Taiji Uino board for high speed communication. When I was scanning through the internal structure of the EMAC,I came across this ...
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7 views

Use arduino uno to program the on-board atmega328 in C [migrated]

I have an Arduino Uno board. I have seen how it is possible to program external AVR's through the Arduino Uno board, for instance an ATtiny. But I'm starting with c for atmel µc and I just want to ...
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46 views

How to configure the SPI pins(MOSI,MISO,sclk and SS) for ATMEL ATSAM3X8E?

I am using ATMEL studio 6 for programming and novice in embedded systems.At present, I have read the theory working of SPI. I understand that I have to set particular bits to one in the control ...
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35 views

Programming multiple ATmega32U4 devices at once without USB

I have a bunch of Atmel controllers which are identical and run the same program. While developing i need to mass program all controllers somehow. The only way they are connected is via I2C. And ...
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44 views

5V I/O Chip Which Works Like An Atmel µC Port? [closed]

I'm working on a project with a 5V vintage 8-bit microprocessor, which I would like to hook some I/O to. I'd like to find a nice little package that could help me with this. I'm happy if it is a ...
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2answers
71 views

Shut down Atmel µCs

I was wondering if it is possible to shut an atmel microcontroller down with a software command? I want to shut my controller down either via a remote command via USART or if an internal error happens ...
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34 views

Programming an Atxmega for using UART

I started to write a program for an ATXMega. This program should read a command via USART, and then execute this command (i.e. either sending data via SPI or sending data back via USART). But the µC ...
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13 views

BMA150 acceleration sensor for SAMD20 SPI connection

I'm trying to get BMA150 acceleration sensor working with my user board which has SAMD20J16 connected to the correct pins. (I'm sure, I've quadruple-checked) I've been stuck for several days trying ...
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118 views

Atmel printf formatting doesn't work, no formatting does work

We are running an Atmel AVR32 chip on our board, and recently discovered that printf with format/conversion specifiers doesn't work. A regular ...
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34 views

How to use the simulation in atmel-studio properly?

I wanted to start a bit µC development with the Atmel Studio 6.2, and therefore my first step was to compile a small program for simply switching a pin from HIGH to LOW and back all the time. I took ...
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53 views

Atmega32 LCD program not working

i have recently been into atmega world after i heard it is much better than pic and it is my second tutorial about writing to LCD i wrote this program in atmel studio but it doesnt work i double ...
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29 views

ATSAM functionality

I checked the datasheets and the overview pages on Atmel's site for these ARM cores, and I think they are amazing. Especially looking at the ATSAMA5D41, this would go well with a project I am working ...
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67 views

How to program enc28j60??

I read enc28j60 is unprogrammable directly from the computer but it has registers that I can program so how can I excactly do this.. is it programmed from the mcu connected to it through spi or is ...
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2answers
82 views

Use or remove reset capacitor?

I am currently connecting an AVR ATXmega 16A4U in my circuit. According to AVR (http://www.atmel.com/Images/doc8278.pdf, p6) the external reset circuit should look like simulate this circuit ...
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35 views

How to select external crystal in atmega162

How to set AVR to select external crystal for clock? A _delay_ms(1000) is producing a quick beep however it should produce 1 sec beep if it is operating on 12Mhz. Could it be done programatically of ...
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58 views

Using Atmel Software Framework

http://www.atmel.com/tools/avrsoftwareframework.aspx?tab=overview In my company there is a project, depending on this library. However, it is used by copy-pasting some .c and .h files into the ...
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76 views

VHDL - address comparison yields wrong result

I am developing TS-CAN1 emulator on Atmel's ATF1508AS. One part of an application is an address decoder implemented as follows (only interesting parts are left): ...
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39 views

RFID interfacing with atmega162 problem

I have interfaced RFID and atmega162 as in picture , but I am getting garbage with blank spaces, hypens on lcd , please see my code and tell me whats could be the problem, Hoping for your help. ...
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38 views

RFId interfacing with atmega162

I am new to programming, I have created a schematic of my project I am not sure it would work or not. I have RFID 125khz - Model no RFID6300. Do this module require MAX232 to be used in between ...
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182 views

How can I design my PCB in a way I can debug the Atmel microcontroller on board?

We are designing a board around Atmel SAM4E microcontroller, and use Atmel-ICE for debugging/programming. To save space, we would like to avoid including the whole ICE connector. Which are the minimum ...
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55 views

Buzzer not working with delay avr atmega162

Hi I have got a problem that will be simple to you guys but i am newbie so its difficult for me to get things done correctly, I Have buzzer interfaced with PinC0 of atmega162 , with crystal 12MHz ...
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67 views

Atmel EDBG External ARM Target

I am looking to program one of Atmels 802.15.4/ARM Cortex-M0+ chips and would like to know if it is possible to do through Atmel Studio with the help of the EDBG on a Samr21 xplained board. I have ...
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52 views

What image sensors can I use with Atmel's ISI interface on a SAM9G25?

Atmel's SAM9G25 includes an "Image Sensor Interface" peripheral, which is nicely documented, and "...can be used to connect various image sensors". What I am struggling with is: 1) How do I find ...
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42 views

DAC via I2C: detect error conditions

We are using a MAX517 DAC-device as slave and an ATmega8535 controller as master. Communication errors can be readily detected by comparing (TWSR & 0xF8) with 0x08 for Start, 0x18 for address ...
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2answers
79 views

Wired communication from 1 atmel to many nodes

Right now i am looking for a better way to communicate to our wired nodes in a project that we are working on. Currently there is 1 main node that all other nodes talk to that in turn handles all ...
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3answers
391 views

Find first pin of a LQFP chip

I have bought some ATSAM4E8C chips in LQFP 100 package. The datasheet shows that the IC should have a dot indicating the first pin, but mine have two dots. One larger in the corner, and a smaller ...
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50 views

Interacting with the host OS

I am wondering if an ATMEL micro controller such as an ATMEGA8 or ATTINY2313 has libraries to interact with a computer (windows OS) over USB? If so is there any premade libraries that does the bulk of ...
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45 views

AT32 UC3a3256 connnection problem

I've built a custom board containing an AVR AT32UC3a3256, I'd like to program it using the JTAG connector from the Atmal JTAGICE mk2. When I try to connect it I can't read the JTAG id, it always gives ...
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6answers
522 views

WLCSP MCU's - what hardware is needed for programming these tiny chips?

I just received my DigiKey order of some Atmel ATTiny4 MCU's from DigiKey. I wanted to tinker with one of the smallest MCU's I could find, and this was one of them. It is, in fact, so small because ...
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1answer
102 views

Understanding capacitor usage in the Sparkfun arduino [duplicate]

In the schematic for the Sparkfun Arduino mini pro 3.3v https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/Arduino-Pro-Mini-v14.pdf there's a 0.1uF capacitor (C3) just left of the atmega ground ...
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59 views

1-wire in ATMEGA1281 problem

Could someone help me with something like this? I wanted to add DS18N20 thermal sensor (http://datasheets.maximintegrated.com/en/ds/DS18B20.pdf) via 1-wire interface and when I'm trying to connect it ...
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52 views

AT91SAM9260 Does not recognize 128 MBytes SDRAM

Recently began to use AT91SAM9260 processor on the Olimex board. From the data sheets of the processor, it seems to support up to 256 MBytes of SDRAM. So I replaced both of the old K4S561632C-TC/L75 ...
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110 views

Arduino - receive Ethernet W5100 signal to multiple arduinos

I'm after doing a device in which I'll use 4 AtMega328 chips; Since they'll all be mounted on the same PCB, and I need an ethernet connection for them, I was wondering if there's a way to share the ...
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112 views

Atmega328p Circuit Blinking Circuit

So I am trying to build a standalone circuit using the Atmega 328p. After uploading the code using Atmel Studio and AVRDude I get no response from the circuit; however, when I take the Atmega and put ...
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83 views

Using Atmel-ICE hardware debugger

A while ago we had a project and wanted to program Atmel microcontrollers. Since the project stalled after some time, we never did anything with it. So here it is, lying on my desk this sunday and ...
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58 views

The difference between Atmel ATmega16u2-MU and -MUR

What is the difference between ATMEGA16U2-MU and ATMEGA16U2-MUR? Atmel lists these 2 codes in the table on their product page but I could not find any explanation in the datasheet.
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1answer
131 views

Moving to ARM from 8 bit AVR - how to take the 1st step?

I write code for AVRs for several years now and it seems like my needs are calling for a more powerful processor. Since Atmel Studio is the IDE I'm already using and my debugger also works with ARM ...
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354 views

ATMEL's ARM programming without ASF

I want to make an introduction to "arm programming" without using Atmel Software Framework. That is which i don't know, it's the definitions of chip's peripherals. For example: How can i refer to a ...
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1answer
58 views

Alternative to Atmel programmers [closed]

I am currently using the Dragon AVR to program ATMEGA88 chips on board using ISP I/F. My problem is that it seems somewhat flakey. Is there a reasonably cheap non-Atmel alternative? Ideally a more ...
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48 views

Atmel and coil close on a board - is interference an issue?

I'm going to build a circuit which uses AVR uC (probably ATmega8 or some ATtiny) and a coil with iron powder ring core. The coil has 330uH and will be working under current of approx. 6A. I'd like to ...
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2answers
72 views

Register Syntax question

I was reading some code to use an on an arduino ATMEGA328P and I can't figure out what this line of code does. ASSR &= ~(_BV(EXCLK) | _BV(AS2)); I know that ...
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266 views

Tie Arduino - ATMEGA328P reset pin directly to +5V?

I would like to know if it's okay to tie the reset pin on an ATMEGA328P directly to +5V without using a resistor to avoid random resets and lower part count. If it's not okay, can you explain why it's ...
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58 views

Inverted PWM with ATTiny10

On a 10MHz ATTiny10, the following code generates the same 40kHz 50% duty PWM on both pins 0 and 1: ...
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133 views

What is the best way to interface ST7066 lcd controller with Atmel SAM4E

I am trying to interface ST7066 LCD controller with Atmel SAM4E MCU, but is quite confused about the best way(Least no. of pins used) to interface them together. Should I use GPIOs or Should I go for ...
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449 views

ATTiny85. How do I use the reset pin as an analog input or digital output?

According to this datasheet, the ATTiny85 has 6 I/O pins if we include the reset pin. I used five of them to charlieplex 18 LEDs and I need another one to use as analog input. Would it be possible to ...