// in main.h
struct SRM{
    unsigned int OVERFLOWS[10];
    unsigned int CAPTURE_RISE[10];
    unsigned int CAPTURE_FALL[10];
    unsigned int OVERFLOW_COUNTER[10];
            };

extern struct SRM SRM_measurement_DATA;
extern struct SRM *ptr_SRM_measurement_DATA;

// in main.c {до тела void main(void) }
struct SRM SRM_measurement_DATA;
struct SRM *ptr_SRM_measurement_DATA = &SRM_measurement_DATA;

// в файле DMA.c где нужен доступ с полям структуры
#include "main.h"
extern struct SRM *ptr_SRM_measurement_DATA;

void DMA_init(void)
{
DMA0DAL = (unsigned int)ptr_SRM_measurement_DATA->OVERFLOW_COUNTER;
}