An example to drive onboard led.
A demo to drive OV2640 camera and HDMI output.
KEY_1 is reset and KEY_2 is output switch(Camera image or HDMI output test).
A HDMI frame demo based on SVO.
A demo, shows that Nano 4K HDMI 2K output, but no video, with 2 frames detection by monitor.
A demo of key_flag, burn into Nano 4K, press anykey to switch the led state(Blink or keep current state)