3. Embedded Software

Device Drivers — Quiz

Test your understanding of device drivers with 5 practice questions.

Practice Questions

Question 1

When implementing a device driver, what is the most effective approach to ensure that critical sections of code, such as those accessing shared hardware registers, are protected from concurrent access by multiple threads or interrupt service routines?

Question 2

A device driver for a high-speed network interface card (NIC) needs to transfer large amounts of data to and from system memory with minimal CPU overhead. Which advanced DMA feature is most suitable for handling fragmented memory buffers efficiently without continuous CPU intervention?

Question 3

Consider a scenario where a device driver needs to handle an interrupt from a peripheral that indicates a data-ready event. The Interrupt Service Routine (ISR) must quickly acknowledge the interrupt and schedule a deferred task to process the data. Which of the following mechanisms is most appropriate for deferring the data processing to avoid blocking other interrupts?

Question 4

A device driver is designed for a sensor that provides temperature readings. If the sensor can occasionally return an invalid reading (e.g., $0xFFFF$ for a $16$-bit reading) due to a transient hardware glitch, what is the most robust error handling strategy for the driver to implement?

Question 5

In an embedded system with multiple peripherals, an Interrupt Controller plays a crucial role. Which of the following accurately describes its primary function?