Hi,
First of all, I would like to thankful to you for your fast response. Please
forget about yesterdays mail. In my previous mail, I did a mistake.
I have one more doubt. i.e.,
When I am trying to execute the below Framebuffer example program in Lepton
(http://mulinux.dotsrc.org/lepton.html) linux and Redhat Linux, My program is
unable to open the framebuffer device (/dev/fb0). This program is successfully
running in SuSe Linux 9.3.
How can I open the framebuffer (/dev/fb0) device in Redhat or Lepton Linux?
What can I do? Please show me a solution.
The example program is:
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <sys/mman.h>
int main(void)
{
int fbfd,fbfd1,fbfd2;
struct fb_var_screeninfo vinfo;
struct fb_fix_screeninfo finfo;
printf("\nReturn Values of \n\n");
/* Open the file for reading and writing */
fbfd = open("/dev/fb0", O_RDWR);
printf("\nfbfd = %d",fbfd);
/* Get fixed screen information */
fbfd1 = ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo);
printf("\n fbfd1 = %d",fbfd1);
/* Get variable screen information */
fbfd2 = ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo);
printf("\nfbfd2 = %d\n",fbfd2);
printf("\n\n%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel
);
close(fbfd);
return 0;
}
The output of the above program is :
Return Values of
fbfd = -1
fbfd1 = -1
fbfd2 = -1
Thatmeans, Framebuffer device is not opening. So, to achieve this problem,
what can I do? This is really very urgent. Please show me a solution. I will be
waiting for your reply. Thank you very much for considering your valuable time
for me.
With regards,
Chandra.
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