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Extern variable in ISR

开发者 https://www.devze.com 2022-12-14 07:53 出处:网络
Is it safe to use exte开发者_JAVA技巧rn data qualifier for a variable in an ISR?Assuming C: yes, but you need to mark the variable wth keyword volatile to let the compiler know its value can change in

Is it safe to use exte开发者_JAVA技巧rn data qualifier for a variable in an ISR?


Assuming C: yes, but you need to mark the variable wth keyword volatile to let the compiler know its value can change in more than one thread (the interrupt is basically a different thread).

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