#include <stdio.h>#include <unistd.h>#include <sys/types.h>#include <sys/mman.h>#include <sys/stat.h>#include <fcntl.h>#include "mbuff.h"unsigned long baseaddr=0x00;#define DMA_TOTAL_SIZE (3*4096)/* it could be also written as 'ab' but gcc complains */#define DMA_FILL1 ('a'+'b'<<8)#define DMA_FILL2 ('C'+'D'<<8)#define DMA_FILL3 ('x'+'y'<<8) main (int argc,char **argv){ int fd, fd1; volatile unsigned short int *dmabuf;   int i;	struct mbuff_request_struct req={0,"mybuf",DMA_TOTAL_SIZE*4,0};;      if(( fd = open(MBUFF_DEV_NAME,O_RDWR) ) < 0 ){	perror("open failed");      exit(1);   }      /*caddr_t  mmap(caddr_t  addr,  size_t  len,  int prot , int		        flags, int fd, off_t offset );*/	if((dmabuf=(volatile unsigned short int *)mmap(NULL,DMA_TOTAL_SIZE,PROT_WRITE|PROT_READ,MAP_SHARED|MAP_FILE,fd, 0)) == (volatile unsigned short int*) -1){		printf("MMAP error %d\n",dmabuf);		perror("mmap");//		exit(2);	} else {		printf("success, %d bytes mmaped at %p\n",DMA_TOTAL_SIZE,dmabuf);		sleep(2);		for(i=0;i<DMA_TOTAL_SIZE/sizeof(*dmabuf);i++) {			dmabuf[i]=DMA_FILL1;		}		printf("memory set\n");	}	ioctl(fd,IOCTL_MBUFF_ALLOCATE,&req);	mmap(NULL,DMA_TOTAL_SIZE*4,PROT_WRITE|PROT_READ,MAP_SHARED|MAP_FILE,fd,0);	ioctl(fd,IOCTL_MBUFF_DEALLOCATE,&req); /* will be freed on unmap */	sleep(5);	close(fd);	printf("closed\n");	sleep(5);	for(i=0;i<DMA_TOTAL_SIZE/sizeof(*dmabuf);i++) {		dmabuf[i]=DMA_FILL2;	}	printf("set again to CD\n");	sleep(5);	printf("unmapping in 1s\n");	sleep(1);	munmap((char*)dmabuf,DMA_TOTAL_SIZE);	printf("unmapped\n");	sleep(5);	printf("trying to write again\n");	for(i=0;i<DMA_TOTAL_SIZE/sizeof(*dmabuf);i++) {                dmabuf[i]=DMA_FILL3;        }	return(0);}