MCUXpresso SDK Documentation
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How to define IRQ handler in CPP files

How to define IRQ handler in CPP files#

With MCUXpresso SDK, users could define their own IRQ handler in application level to override the default IRQ handler. For example, to override the default PIT_IRQHandler define in startup_DEVICE.s, application code like app.c can be implement like:

// c
void PIT_IRQHandler(void)
{
    // Your code
}

When application file is CPP file, like app.cpp, then extern "C" should be used to ensure the function prototype alignment.

// cpp
extern "C" {
    void PIT_IRQHandler(void);
}
void PIT_IRQHandler(void)
{
    // Your code
}