Advantage of using rtos architecture in embedded system
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RTOS Advantages
Simple embedded systems typically use a Super-Loop concept where the application executes each function in a fixed order. Interrupt Service Routines (ISR) are used for time-critical program portions.
This approach is well suited for small systems but has limitations for more complex applications.
Disadvantages of the Super-Loop Concept
Time-critical operations must be processed within interrupts (ISR)
ISR functions become complex and require long execution times
ISR nesting may create unpredictable execution time and stack requirements
Data exchange between Super-Loop and ISR is via global shared variables
Application programmer must ensure data consistency
A Super-Loop can be easily synchronized with the System timer, but:
If a system requires several different cycle times, it is hard to implement
Split of time-consuming functions that exceed Super-Loop cycle
Creates software overhead and application program is hard to understand
Super-Loop applications become complex and therefore hard to extend
A simple change may have unpredictable side effects; such side effects are time consuming to analyze.
These disadvantages of the Super-Loop concept are solved by using a Real-Time Operating System (RTOS).
Simple embedded systems typically use a Super-Loop concept where the application executes each function in a fixed order. Interrupt Service Routines (ISR) are used for time-critical program portions.
This approach is well suited for small systems but has limitations for more complex applications.
Disadvantages of the Super-Loop Concept
Time-critical operations must be processed within interrupts (ISR)
ISR functions become complex and require long execution times
ISR nesting may create unpredictable execution time and stack requirements
Data exchange between Super-Loop and ISR is via global shared variables
Application programmer must ensure data consistency
A Super-Loop can be easily synchronized with the System timer, but:
If a system requires several different cycle times, it is hard to implement
Split of time-consuming functions that exceed Super-Loop cycle
Creates software overhead and application program is hard to understand
Super-Loop applications become complex and therefore hard to extend
A simple change may have unpredictable side effects; such side effects are time consuming to analyze.
These disadvantages of the Super-Loop concept are solved by using a Real-Time Operating System (RTOS).
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