Microchip C18 - How to Access Static Variable

[Techtone]

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

 

[Kaleborg]

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

ie.

extern unsigned char varName;

 

[Techtone]

Hi Kaleborg,

That worked perfectly

Thank you for you assistance.


Tony

 

[amraldo]

Static variables are only accessed within the same file.
--
Amr

 

[Techtone]

Amr, I will remember that.

Thank you fot your input.

Tony