[ts-7000] Re: Frame Buffer Programming ?

["gamehoser" <>]

Ok, I finally found my bug.  I was off by 1 in a shift left that
computed the bit blit destinations.  This caused me to have the
incorrect idea about which page I was seeing when I was writing
straight to the framebuffer.  It's all good now.  Thanks again Pete!


--- In  "PeterElliot" <> wrote:
>
> --- In  "gamehoser" <james.singer1@> wrote:
> >
> > Alright, using this I whipped a quick test and I'm still having
> > trouble making it behave in a predictable fashion.  The bus page
> > select bits seem to control what page is visible as I would expect
> > when the raster page bits are all 0, but when I set any of the 
> raster
> > bits, it seems to ALSO affect what page is visible and I end up 
> seeing
> > noise.  Is there anywhere I can get a quick look at a double 
> buffering
> > sample that works properly?
> > 
> 
> I use a macro define:
> 
> #define SetDispBufNums(x,y) (0x300 |(x<<3) | y)
> 
> Then I use:
> 
> VGAregs[_vVIDCTRL] = SetDispBufNums(1,2);
> 
> This selects screen 1 to view and 2 to edit (or was it the other way 
> round;)
> 
> Swapping the 1 and 2 will toggle displays. The values are 0..7.
> 
> main(){
> int i;
> volatile unsigned short *VGAregs;  // VGA Registers   16 Bit
> volatile unsigned short *fb;       // Screen buffer   16 Bit
> 
> /*--Map VGAregs-----------*/
> VGAregs = (unsigned short *)mmap(0, 4096, PROT_READ|PROT_WRITE, 
> MAP_SHARED, mem_fd, 0x72000000);
> if (VGAregs == MAP_FAILED) { perror("mmap1:"); return 0; }
> VGAregs += (0x30/sizeof(unsigned short));
> 
> /*--Map Framebuffer-----------*/
> fb = (unsigned short *)mmap(0, _scrW*_scrH*2, PROT_READ|PROT_WRITE, 
> MAP_SHARED, mem_fd, 0x72200000);
> if (fb == MAP_FAILED) { perror("mmap2:"); return 0; }
> 
> VGAregs[_vVIDCTRL] = SetDispBufNums(1,2);
> for (i=0; i<(640*480); i++) fb[i]=0xF800; // Fill Red
> sleep(1);
> VGAregs[_vVIDCTRL] = SetDispBufNums(2,1); // Display Red
> for (i=0; i<(640*480); i++) fb[i]=0x07C0; // Fill Green
> sleep(1);
> VGAregs[_vVIDCTRL] = SetDispBufNums(1,2); // Display Green
> sleep(1);
> VGAregs[_vVIDCTRL] = SetDispBufNums(2,1); // Display Red
> sleep(1);
> VGAregs[_vVIDCTRL] = SetDispBufNums(1,2); // Display Green
> }
> 
> I don't have my TS-7300 with me to test it...
> 
> Hope this helps.
> 
> PJE
>




 
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