Hi,
I'm just assuming that the size of an unsigned short is _not_ one byte
on your board. It's most likely 2.
If so, you should insert sizeof(unsigned short) to actually specify to
the compiler that you want 640*480*2 * _2_ bytes instead of only
640*480*2 bytes.
fb = (unsigned short *)mmap(0, sizeof(unsigned short)*640 * 480 * 2,
PROT_READ|PROT_ WRITE, MAP_SHARED, fd, 0x72200000);
The sizeof an unsigned short should represent the bit-depth of the
framebuffer you are using.
Cheers,
~/Chris
mattsaintdev wrote:
> Hi,
>
> as a newbie ive been trying my TS-7200 using cygwin on my pc to
> compile helloworld ok.
>
> Ive got the Video card too and would like to make some use of it but
> im stuck. The TS support helped me by sending the bitblt.c source
> code that mmaps the fb and has a bitblt() function.
>
> However, if i compile it i get nothing
- well i do see the login
> prompt still.
>
> I assume that the frame buffer is a (640x480) * 2 byte buffer and
> that code can simply write and read once mapped?
>
> If so why wont ;
>
> int fd = open("/dev/mem" , O_RDWR|O_SYNC) ;
>
> regs = (unsigned short *)mmap(0, 4096,PROT_READ| PROT_WRITE,
> MAP_SHARED, fd, 0x72000000);
>
> fb = (unsigned short *)mmap(0, 640 * 480 * 2, PROT_READ|PROT_ WRITE,
> MAP_SHARED, fd, 0x72200000);
>
> allow me access?
>
> And wheres all the other 7592KB gone i.e wont this be linear video
> space?
>
> All help appreciated,
>
>
> Matt
>
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