Hands-On RTOS with Microcontrollers

Usage of polled drivers

There are a few circumstances where polled drivers are especially helpful:

• System verification: This is perfectly acceptable when performing initial system verification, but at that stage of development, it is debatable whether an RTOS should be used at all. If the application happens to be truly single purpose, there is nothing else to be done while waiting for data to be transferred, and there are no power considerations, this would also be an acceptable approach.
• Special cases: Occasionally, there may be times when a very special-purpose piece of code is needed for a limited scope. For example, a peripheral may need to be serviced with an extremely low amount of latency. In other cases, the event being polled for ...