Archive app_task.md

book/en/archive/by_example/app_task.md

@@ -0,0 +1,23 @@
+<!-- Should probably be removed -->
+
+# Defining tasks with `#[task]`
+
+Tasks, defined with `#[task]`, are the main mechanism of getting work done in RTIC.
+
+Tasks can
+
+* Be spawned (now or in the future, also by themselves)
+* Receive messages (passing messages between tasks)
+* Be prioritized, allowing preemptive multitasking
+* Optionally bind to a hardware interrupt
+
+RTIC makes a distinction between “software tasks” and “hardware tasks”.
+
+*Hardware tasks* are tasks that are bound to a specific interrupt vector in the MCU while software tasks are not.
+
+This means that if a hardware task is bound to, lets say, a UART RX interrupt, the task will be run every
+time that interrupt triggers, usually when a character is received.
+
+*Software tasks* are explicitly spawned in a task, either immediately or using the Monotonic timer mechanism. 
+
+In the coming pages we will explore both tasks and the different options available.