Problem with using Routines in Main program file in the Interrupt service routine

I have a routine in my main program file for displaying float values on terminal program. When i try to use the same routine in my Interrupt service routine(ISR), it give an warning stating "Reference made to unresolved function". Secondly i also wanted to know how can i use a global variable in the ISR as its not possible to pass a parameter from any routine to the ISR.

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