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In today's world of battery-operated devices, the proper use of the low-power/sleep modes provided in most embedded microcontrollers (MCUs) is critical. At the same time, most high-volume MCU applications, such as home appliances, vending machines, motor controllers, and electronic toys, are organized as foreground/background systems (super-loops or main + ISRs).
The foreground/background architecture consists of two main parts--the foreground comprises the interrupt service routines (ISRs) that handle asynchronous external events in a timely fashion, and the background is an infinite loop that uses all remaining CPU cycles to perform the less time-critical processing.
The foreground typically communicates with the background through shared memory. The background loop protects this memory from potential corruption by disabling interrupts when accessing the shared variables.
From www.embedded-systems.com |
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