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OSIntEnter() notifies µC/OS-III that an ISR is being processed. This allows µC/OS-III to keep track of interrupt nesting. OSIntEnter() is used in conjunction with OSIntExit(). This function is generally called at the beginning of ISRs. Note that on some CPU architectures, it must be written in assembly language (shown below in pseudo code):

          MyISR:
              Save CPU registers;
              OSIntEnter();               /* Or, OSIntNestingCtr++ */
                  :
              Process ISR;
                  :
              OSIntExit();
              Restore CPU registers;
              Return from interrupt;

Files

os.h/os_core.c

Prototype

void  OSIntEnter (void)

Arguments

None

Returned Values

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