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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