I am building a small monitor system using D5M and DE2-115.
My current working code is like:
D5M camera -> some processing -> Clocked_Video_Input -> alpha_mixer -> Clocked_Video_Output -> VGA port on the board. Images from camera can be displayed on an external monitor correctly.
Then I tried pattern_generator -> alpha_mixer (controlled by a NIOS2) -> Clocked_Video_Output -> VGA port, and it also works.
Now I am trying to combine these two, which is just to add the NIOS2 to control the alpha_mixer in the first design. And now I cannot see the output anymore. The NIOS2 core did nothing except initiating the alpha_mixer core. I don't know what's wrong with it.
One thing I noticed is that the overflow signal from the clocked_video_input core went high.
Anyone has some suggestions? thanks.