AVR microcontrollers have timers which can fire interrupts at intervals. This mechanism can be used to implement preemptive multitasking (no explicit context switches needed) for the AVR. There is an overall speed penalty due to context switching because AVR microcontrollers do not have multiple cores. I do not see a practical use for this library, but I think it's interesting.
This is written in assembly because of its low-level nature. I know it works on
an ATmega328P, but not much beyond that. The instructions adiw,
std Z+q, ..., movw, and mul are required, among others.
AVR GCC and AVR binutils are required. avrdude is needed to upload the example.
To make the static library:
make libavrt.a
To make the example:
make
To upload the example:
make upload
You might need to set port=... if the board is not connected to
/dev/ttyUSB0. For example, if the board is on /dev/ttyUSB1, use
make port=/dev/ttyUSB1 ....
Examples are in the examples directory. Read more about each example in its
directory.
The only test right now are the examples. I might add more later.