medium10 pts · first answer countsfirmwareinterruptsconcurrency

Counter read gives odd values

On an 8-bit AVR, a timer ISR increments a volatile uint32_t tick counter. Main code sometimes reads values that are wildly wrong for one sample. Why?

A.volatile makes the compiler skip some incrementsB.The ISR runs faster than the CPU clockC.The 32-bit read takes several instructions and the ISR can run mid-readD.Integer overflow in the ISR resets the counter to a random value

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Counter read gives odd values

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