usertest.c

这是嵌入式中的FPGA的驱动

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <stdio.h>
#include <sys/mman.h>
#include <unistd.h>

int main(int argv , char * argc[])
{
	int fd;
	int data, ret;

	fd = open("/dev/AT91_FPGA_Driver0", O_RDWR);
	printf("open FPGA, fd = %d\n", fd);
	if(fd == -1) 
	{
		printf("open error...\n");
		return -1;
	}
	
	printf("read FPGA...\n");
	ret = read(fd, &data, sizeof(int));
	if(ret < 0) 
	{
		printf("read error...\n");
		close(fd);
		return -1;
	}
	
	printf("write FPGA...\n");
	ret = write(fd, &data, sizeof(int));
	if(ret < 0) 
	{
		printf("write error...\n");
		close(fd);
		return -1;
	}
	
	
	close(fd);
	printf("close FPGA...\n");
	return 0;
}