New SDK comes(download at http://vonger.cn/misc/screen/v2screen.tar.xz). Also new port of DOOM, this time, it reaches its max speed, the app is not laggy anymore.
Now we have two versions. One is VoCore version which is big endian, other is DJN version which is little endian.
Big endian is hardware optimized for 24bit bitmap, so you can display 24bit bitmap directly by memory copy.
Little endian is mainly for 16bit bitmap, we use it for frame buffer, so Qt and SDL such library are easily run on it without modify any code.
The two versions are using same driver board.
How to use fbusb.ko
- first your firmware must support frame buffer driver, currently firmware after 20190301 support it already. If you want to use it in your own firmware, you need to select in openwrt source code “make kernel_menuconfig” > Device Drivers >
Graphics support > Frame buffer Devices > Support for frame buffer devices.
- now your firmware is ready, use scp copy fbusb driver to your vocore2 /root folder. The driver is in screen SDK(http://vonger.cn/misc/screen/v2screen.tar.xz), lib/vocore2/ folder, its name is fbusb.xxxx.ko (xxxx is your screen type)
- final step is insert the ko file to your kernel. Call command insmod /root/fbusb.* , if everything works, after this you will find a frame buffer device at /dev/fb0.
- now we can test framebuffer, dd if=/dev/urandom of=/dev/fb0 bs=1000 count=768, then you can find random picture on the screen.