Discussion
Match the driver style with when it suits.
1. Polled 2. Interrupt-driven 3. DMA-driven
P. High continuous data rate Q. Short wait during initialisation R. Occasional events at unpredictable times
Answer: D
The three styles form a progression in both capability and complexity, and the right choice follows from the rate and the predictability of the arrivals. Using the wrong one wastes either processor time or engineering effort.
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