devg-rpxlite

QNX Newsgroups (Archives) qdn.public.ddk.graphics
1

Has anyone had any luck working with this driver? I’m seeing a problem
with the mode function get_modelist(). Is this driver another special case?

thanks
Charlie

2

Charlie_Surface@oti.com wrote:

Has anyone had any luck working with this driver? I’m seeing a problem
with the mode function get_modelist(). Is this driver another special case?

What problem are you seeing? I don’t think there’s anything
special about it. It only supports one mode (640x480x8), so the list
will contain one entry (1234 decimal) followed by the list end marker.

Dave

3

Thanks for the quick reply. In fact, there is a problem with some of our
code which gets the mode list. We are asking the driver for two mode
entries, so it is hanging. I guess we should only be asking for one at a
time.

Charlie

4

Charlie_Surface@oti.com wrote:

Thanks for the quick reply. In fact, there is a problem with some of our
code which gets the mode list. We are asking the driver for two mode
entries, so it is hanging. I guess we should only be asking for one at a
time.

I’m not sure what you mean. You can’t “ask” for a specific number of
modes; the “size” parameter to get_modelist allows you to specify
the size of the “list” array, to prevent a buffer overflow.

Something to note, which is probably not obvious from the docs, is
that “size” must be at least 2 (it makes sense though, the array
should be big enough to hold at least one mode element, plus
the end of list marker). The rpxlite driver will fail (return -1)
if “size” is less than 2.

Dave