SNES Performance Tweaks

[Flavor]

I'm still seeing the refresh rate issue.  For instance, in Super Castlevania IV, when you get an invincibility potion, your character flashes quickly.  On my SAIO  Richter will flash very quickly as expected.  However, on the Freeplay, he will randomly go off and on.  Sometimes not even looking like he's still under the influence, and other times just not there...  I assume the refresh rate of the LCD is not adjustable, yes?  Or can we configure that?  I can try to record both parts if you need to see what I'm talking about.

I think I understand the issue you're referring to, jsawhite.  If you play on HDMI and LCD at the same time, do you see that issue on the HDMI or only on the LCD.  My guess is that you'd only see it on the LCD.

You can adjust the refresh rate, but there are multiple things at play here.

Check out the /boot/freeplayfbcp.cfg file.  It should look something like this:
https://github.com/TheFlav/rpi-fbcp/blob...ayfbcp.cfg

Notice the first line

Code:

   FREEPLAY_FPS = 60;        //120 might be best visually, but lower uses less CPU

My first suggestion would be to set that up to 120 to see if it helps.

Next, I'd try to set

Code:

   FREEPLAY_SCALE_TO_VIEWPORT=1;

to 0.  Doing this will require you to use the overscan settings in /boot/config.txt if you want the LCD to scale to the viewport properly, but you can maybe just leave them alone to run the Castlevania test.

Oh, and there's also a line in /boot/config.txt

Code:

   dtoverlay=waveshare32b,speed=80000000,fps=60,rotate=270

that controls the settings for the LCD driver itself.  You could mess with the FPS there, too.  If I recall correctly, you won't see a difference turning the speed setting up, but feel free to try.

I tried to make this stuff pretty configurable so you could tweak for this sort of stuff.