1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/*
# qtopia core testing framebuffer (1)
# Originally written by Trolltech (2)(3)
#
# (1) http://cep.xray.aps.anl.gov/software/qt4-x11-4.2.2/qtopiacore-testingframebuffer.html
# (2) http://cep.xray.aps.anl.gov/software/qt4-x11-4.2.2/opensourceedition.html
# (3) http://doc.qt.digia.com/4.2/gpl.html
#
# Modified by Sébastien Ballet <slacker6896@gmail.com>
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
int main(int argc, char *argv[])
{
int fbfd = 0;
struct fb_var_screeninfo vinfo;
struct fb_fix_screeninfo finfo;
long int screensize = 0;
char *fbp = 0;
char* fbName="/dev/fb0";
if ( argc > 2) {
printf("usage: checkfb [framebuffer device] \n");
exit(1);
}
if ( argc == 2) {
fbName=argv[1];
}
fbfd = open(fbName, O_RDWR);
if (fbfd == -1) {
perror("Error: cannot open framebuffer device");
exit(1);
}
printf("The framebuffer device (%s) was opened successfully.\n",fbName);
// Get fixed screen information
if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo) == -1) {
perror("Error reading fixed information");
exit(2);
}
// Get variable screen information
if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo) == -1) {
perror("Error reading variable information");
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 ( fbp == MAP_FAILED ) {
perror("Error: failed to map framebuffer device to memory");
exit(4);
}
printf("The framebuffer device was mapped to memory successfully.\n");
munmap(fbp, screensize);
close(fbfd);
return 0;
}
|
