Hi,
First of all, I would like to thankful to you for giving good guidelines and
encouragement to solve my problem. Your suggessions are very helpful to me and
for my work. Thank you very much for your quick response.
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, My program is unable to read the
Fixed screen information(FBIOGET_FSCREENINFO) and Variable screen information
(FBIOGET_VSCREENINFO). But, it is successfully initialized and open the
framebuffer (/dev/fb0) device. The same thing (problem) is repeating in RedHat
Linux also. What can I do? Please show me a solution.
The below program is successfully running in SuSe Linux 9.3. But, it is not
running in Lepton Linux.
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 = 0;
struct fb_var_screeninfo vinfo;
struct fb_fix_screeninfo finfo;
long int screensize = 0;
char *fbp = 0;
/* Open the file for reading and writing */
fbfd = open("/dev/fb0", O_RDWR);
if (!fbfd)
{
printf("Error: cannot open framebuffer device.\n");
exit(1);
}
printf("The framebuffer device was opened successfully.\n");
/* Get fixed screen information */
if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo))
{
printf("Error reading fixed information.\n");
exit(2);
}
/* Get variable screen information */
if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo))
{
printf("Error reading variable information.\n");
exit(3);
}
printf("%dx%d, %dbpp\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel );
/* Figure out the size of the screen in bytes */
screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
/* Map the device to memory */
fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED,
fbfd, 0);
if ((int)fbp == -1)
{
printf("Error: failed to map framebuffer device to memory.\n");
exit(4);
}
printf("The framebuffer device was mapped to memory successfully.\n");
munmap(fbp, screensize);
close(fbfd);
return 0;
}
The above program is displaying 3 errors. Those are:
Error reading fixed information
Error reading variable information.
Error: failed to map framebuffer device to memory.
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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