Question

What is difference between polling and interrupt in embedded system in lpc2129?

Answer 1

Answer:

In polling is not a hardware mechanism, its a protocol in which CPU steadily checks whether the device needs attention. ... In interrupt, the device notices the CPU that it requires its attention. Whereas, in polling, CPU steadily checks whether the device needs attention....

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Answer 2

Answer:

☑ The biggest difference is the reaction time for the event, with interrupts, it is almost immediately, it takes only the time for the context switching. With polling, is the time you can check the event, and depending on how busy your software is, you can end with a high reaction time