What is `ISR(overflow)` in C?

Answered on : 2024-01-24

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C Global declared in ISR

stackoverflow.com

C Interrupts

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Trouble catching overflow interrupt (Period Elapse...

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1. **ISR Definition**: ISR stands for Interrupt Service Routine. It is a special routine executed in response to a specific event, often an interrupt. In the context of C programming, ISRs are used to handle events like timer overflows.

2. **Overflow in ISR**: "ISR(overflow)" typically refers to handling overflow interrupts. For example, in timer-related ISRs, the routine may trigger when a timer overflows, indicating that it has reached its maximum value.

3. **Shared Variables**: ISRs may involve shared variables between the main program and the ISR. Global variables declared for this purpose need careful handling to avoid issues [1] [4].

4. **Example Issues**: Problems like stack overflow or unknown function invocation during ISR execution can occur and need attention [6] [7].

Understanding ISR and overflow interrupts is crucial for efficient event handling in embedded systems [2] [5] [8] [9] [10].