Re:add user interrupts on future device

> ...the difference between an RTOS and a non-RTOS begins to blur. Both are good - it depends on your application

Very true indeed! One has to ask the question how real time does the application need to be.

With an instruction cycle of 20ns and the very good NVIC it can be quite hard to justify the need for a pre-emptive RTOS for small applications.

To complicate the argument further a combination of pre-emption and function scheduling can have benefits. This can be a good way of separating background tasks that don't care about latency from the things that do care.