[ts-7000] Re: Frame Buffer Programming ?

["PeterElliot" <>]

--- In  "gamehoser" <> 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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