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#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);
}
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