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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |