This is a simple program that implements a task scheduler. It executes a series of tasks attached to the scheduler after their specified task period (in milliseconds) has passed.

In the example, four leds are controlled: two blink at different rates, and the other two controlled by buttons.

• avr-gcc and avr-libc to compile the code
• avrdude for uploading the program to the microcontroller

Having the dependencies installed, compile the code running make or:

$ make compile

Then with the board connected to the computer, check the port with:

$ ls /dev/tty*

Often appears as /dev/ttyUSB* or /dev/ttyACM*, by default /dev/ttyUSB0 is used, to override this execute make asigning the corret port to the PORT shell variable, for example:

$ PORT=/dev/ttyUSB1 make upload