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SPI reset problem
I'm using an Atmega644a that communicates with an Arduino Uno (Atmega328p) over SPI for logging purposes. The Arduino is the SPI slave. It works fine unless I reset or flash the...
Saturday, 26 March 2016 - 11:22
Weird global variable initialization behaviour
I'm using an attiny1634 as a dedicated crypto chip with which my main mcu interacts over SPI. I'm using the 3rd party library avrnacl for this. The problem is that the library...
Friday, 11 March 2016 - 16:02
Slave select for single slave SPI communication
I want to make an ATmega (master) talk to another ATmega (slave) over SPI. Since there is only one slave I can get away without using  a slave select pin, and simply...
Saturday, 13 February 2016 - 11:43
Bootloader too small (authenticated encryption + Bluetooth)
I'm writing a bootloader that has to update the chip's application code over Bluetooth. The firmware should be sent authenticated encrypted to the device. I'm not worried about an...
Monday, 8 February 2016 - 22:22
Merge EEPROM from bootloader and application
I have an EEPROM variable in my bootloader that signals whether the bootloader should run the application or should listen for data on a communication channel. The idea is taken...
Thursday, 4 February 2016 - 12:51
Avrisp mk2 current draw
Does anyone know how much current the avrisp mkii draws? I checked the document on the Atmel site but couldn't find any electrical specs. 
Monday, 21 December 2015 - 16:39
Symmetric cryptography with 8-bit microcontroller
I need to use symmetric authentication encryption (AES-GCM or AES-CCM probably) in my project and was wondering whether it would be best to use a crypto-specific chip (like the...
Tuesday, 28 April 2015 - 10:20
PCB design feedback
Hi, This is my second PCB prototype and and I would like to get some feedback on it. Basically there is a BLE113 to send receive BLE commands. These commands get transmitted...
Sunday, 28 December 2014 - 22:23
Interrupt driven encoder with unexpected behaviour
Hi all,   I’m using an Atmega328p with a quadrature encoder to make a DC motor move to a setpoint value. I’m using interrupts to make a counter go up each time I have a...
Tuesday, 2 December 2014 - 12:58
Atmega328p RAM shortage?
I’m using an Atmega328p which is communicating with a Bluegiga BLE113 and I’m getting unexpected behaviour. It’s only after a couple days of debugging that I realised that it...
Wednesday, 5 November 2014 - 23:32