Manju,

Do you have the variables defined as GLOBAL or LOCAL?  If they are
LOCAL, then the rest of the program won't see them, and you'll get such
an error message.

I don't know the 24F series very well, so I don't know whether this is
possible or not.  But it's something to keep in mind.



	
Regards,

	
Jim





-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Manju Bhargavi
Sent: Thursday, August 14, 2008 11:41 AM
To: piclist@mit.edu
Subject: PIC -interrupts in PIC24F series

Hi,

I am working on PIC24F series micro controller. I have wrote all the
interrupt handlers in a seperate file named interrupts.c. If i try use a
variable which is defined ina any other file say uart.h it is throwing
me an error saying that it is an undefined variable.

I have made all the registers and baud rate setting required for the
UART communication. I have used UART2 for the same

illustration of the above expalined issue

interrupt.c file
--------------------

#include "uart.h"

void __attribute__((__interrupt__, auto_psv)) _U2RXInterrupt(void) {
  IFS1bits.U2RXIF = 0;
   l_test_var_U8 = U2RXREG;
}



uart.c file
-------------

char l_test_var_U8;



uart.h file
--------------

extern char l_test_var_U8;


If i declare this variable in the interrupt.c file and use it then it is
compling and working for me

Could you please let me know what the issue could. Hope my question is
undersatndable ::))


Thanks and Regards

Manju Bhargavi
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