Microchip C18 - How to Access Static Variable

Hi,

I am working on a project using Microchip P18F2455.

In my project I have several source files, including one named irqhigh.c which handles a timer interrupt.

My main source file is called main.c.

I am at a loss knowing how to declare a variable which can be accessed by both of the source files. Basically, I need to set a variable upon detection of a button press by the debounce routine in irqhigh.c, I then need to be able to read the same variable from the code in main.c.

I have looked at #pragma udata directive and the static keywords, but am just at a loss as to knowing how and where to declare this variable I need.

Sorry if it seems a daft question. I am new to C and Microchip C18, but have many years of PIC assembler experience.

Thanks in advance for any suggestions.

Tony

You have to define that variable as extern in both of the files.

ie.

Hi Kaleborg,

That worked perfectly

Thank you for you assistance.


Tony

Static variables are only accessed within the same file.
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Amr

Amr, I will remember that.

Thank you fot your input.

Tony