declaring extern in usartf1.c file ,....and calling it in my sketch but I received error "expected identifier or '(' before string constant extern "c" void....."
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extern "C" void __irq_usart3(void);
I tried also to move the same line in my sketch but I have again another compile error of " previous declaration" but there is none.I removed the function from usartF1 file and there is no other.
I want to be able to use my handler or maple handler in my sketch.