Events/2020/AVR

Have you ever wondered what a little Arduino is really capable of? Ever wanted to really understand a chip? Learn lots of nitty-gritty details about the Microchip AVR architecture, the processor architecture that powers the Arduino and many other products.

Code Samples

Godbolt 1

#define __AVR_ATmega328P__

#include "https://raw.githubusercontent.com/vancegroup-mirrors/avr-libc/master/avr-libc/include/stdlib.h"
#include "https://raw.githubusercontent.com/vancegroup-mirrors/avr-libc/master/avr-libc/include/avr/io.h"

#define DIRECTION_PORT DDRB

int main()
{
  const int DIRECTION_MASK = 0b00001110;
  uint8_t direction = 0b00001010;
  // https://github.com/gnea/grbl/blob/master/grbl/stepper.c#L324
  DIRECTION_PORT = (DIRECTION_PORT & ~DIRECTION_MASK) | (direction & DIRECTION_MASK);
  return 0;
}