forums.ps2dev.org

matkeupon · Joined: 02 Jul 2005 Posts: 26

Hi all,

I'm starting dev on the PSP, and I'm having some trouble figuring basic stuff out. Looks like I'm not doing some stuff correctly.

As a test I tried to have a small 16x16 bitmap blitted on screen, moving from left to right. My problem is that, even when using double buffering, the bitmap flickers and sometimes it isn't drawn entirely.

When I use sceKernelDcacheWritebackAll() before switching the framebuffer, then the display is correct and no more flickers. So I guess writeback isn't disabled on the framebuffer memory.

Is that right, or am I missing something ? How do you set the cache on the PSP ??

Thanks in advance.

TyRaNiD · Joined: 18 Jan 2004 Posts: 918

Ensure that you pointer to vram is or'ed with 0x40000000. i.e. in phsyical memory vram is at 0x04000000, change that to 0x44000000. That will cure your cache issues.

matkeupon · Joined: 02 Jul 2005 Posts: 26

Thanks, TyRaNiD, I guess I didn't search the forum enough before posting as this can be found on the page 2...

Another question, as I am really lost I don't even know where to find the pspsdk updates nor the cvs...

Thanks again

ReKleSS · Posted: Sun Jul 03, 2005 8:24 am Post subject:

Everything is in subversion this time. Check the readme file for the sdk.
-ReK