Webret = ioctl(fd, FBIOGET_FSCREENINFO, &finfo); 來實現讀取硬體不可變的資訊。 而通過 ret = ioctl(fd, FBIOGET_VSCREENINFO, &vinfo); 則可以讀取硬體的可變資訊，然後再對這些讀取到的資訊進行調整，然後再寫進去到螢幕的暫存器中即可改變顯示器的設定 Web过ioctl(fb, FBIOGET_VSCREENINFO, &info)获取struct fb_var_screeninfo defined in "linux/fb.h" ）,有些则是固定属性（通过ioctl(fb, FBIOGET_FSCREENINFO, &info)获 …

Accessing FrameBuffer through IOCTL - Google Groups

Web21 jul. 1998 · The following structures play a role in the game of frame buffer devices. They are defined in . Outside the kernel (user space) struct fb_fix_screeninfo. Device independent unchangeable information about a frame buffer device and a specific video mode. This can be obtained using the FBIOGET_FSCREENINFO ioctl. struct … Webioctl(fp,FBIOGET_VSCREENINFO,&vinfo) 可变参数. ioctl(fp,FBIOGET_FSCREENINFO,&finfo) 固定参数. 3.内存映射(mmap) screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8 /*这就是把fp所指的文件中从开始到 screensize 大小的内容给映射出来，得到一个指向这块空间的指针*/ greenbrier physicians group covington va

iMX FBIOPAN_DISPLAY hangs if called after FBIO_WAITFORVSYNC …

Web30 jul. 2014 · Layer IOCTLs. make any of the layers set, it is recommended to set this parameter layers call DISP_CMD_LAYER_SET_PARA command immediately after the … Web18 nov. 2010 · 如果应用程序需要知道Framebuffer设备的相关参数，必须通过ioctl()系统调用来完成。 在头文件中定义了所有的ioctl命令字，不过，最常用的ioctl命令字 … http://m.blog.chinaunix.net/uid-16759545-id-5212502.html greenbrier physicians fax number