66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <linux/fb.h>
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struct fb_info{
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int fd;
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void *ptr;
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struct fb_var_screeninfo var;
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struct fb_fix_screeninfo fix;
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};
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void fb_getinfo(struct fb_info *fb_info){
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printf("fb res %dx%d virtual %dx%d, line_len %d\n",
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fb_info->var.xres, fb_info->var.yres,
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fb_info->var.xres_virtual, fb_info->var.yres_virtual,
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fb_info->fix.line_length);
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printf("dim %dmm x %dmm\n", fb_info->var.width, fb_info->var.height);
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printf("xoffset %d yoffset %d\n", fb_info->var.xoffset, fb_info->var.yoffset);
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}
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int fb_open(struct fb_info *fb_info){
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int fd = open("/dev/fb0", O_RDWR);
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if(fd < 0){
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printf("Failed to open fb\n");
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return 1;
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}
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fb_info->fd = fd;
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return 0;
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}
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void flip_buffer(struct fb_info *fb_info, int n){
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if( ioctl(fb_info->fd, FBIOPAN_DISPLAY, &fb_info->var) < 0 ){
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printf("Failed FBIOPAN_DISPLAY\n");
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}
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}
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int main(int argc, char *argv[]){
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setpriority(PRIO_PROCESS, 0, -20);
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struct fb_info fb_info;
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fb_open(&fb_info);
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while(1){
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flip_buffer(&fb_info,0);
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usleep(16666);
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}
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return 0;
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}
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