Polling or Interrupt based method

Question

When should one use polling method and when should one use interrupt based method ? Are there scenarios in which both can be used ?

Answer 1

You don't want to have your host waiting in the busy loop for a long time, and also polling can become inefficient when frequent checks are made for data that is not there frequently. So there for, if t he host and the device are both fast, then polling if pretty fast.