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Calling C function from ISR

Hi,

I am trying to call a C function from the interrupt subroutine in LPC3250.

When I call the function from a C file, there is no problem. However, when I use a C++ file containing the required function I get an error.

The error says:
Undefined symbol C_Irq_Handler (referred from lpc32x0.o)

How can I call the function from the C++ file?

Thanks for your help.

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