Hands-On RTOS with Microcontrollers

Chapter 10

1. Interrupt-driven drivers are more complex because there are at least three pieces of code involved (setup code, ISR code, and callback code). With a polled driver, all of this happens serially.  
2. False. Only functions ending in FromISR may be called within an ISR.
3. False. Interrupts take precedence over the scheduler since the scheduler should be configured to run from the lowest priority interrupt. 
4. DMA – it uses hardware to transfer data between peripherals and memory, without any CPU intervention.
5. Direct Memory Access.
6. Attempting to receive data at any point in time is very difficult to do well with a raw buffer. Raw buffers can also become a bit complex when receiving data of unknown length.