Which file defines numEdma3Instances in EDMA3 eample project

Hi,

I try loading the run EDMA3  project coming with EVM6678 board. I cannot find the file which defines variable "numEdma3Instances". In main.c, it declares as extern:

#include    <xdc/std.h>

#include    <stdio.h>

#include    <string.h>

#include   <ti/sysbios/knl/Task.h>

#include   <ti/sysbios/BIOS.h>

#include  "sample.h"

extern    const unsigned int numEdma3Instances;

Thanks,