Hi Dave, On 12/17/19, Dave Marples <d...@marples.net> wrote: > Folks, > > I've implemented an ePaper driver under nxgl, but as some of you are > probably aware there needs to be an explicit redraw request to update an > ePaper display. >
Other guy already used ePaper with NX Graphic libs, if I'm not wrong it was Petteri Aimonen. He also used NuttX nxgl in his Master Thesis: http://jpa.kapsi.fi/stuff/other/diplomityo.pdf > I'm not quite sure how to do that under nxgl as normally it would be > driven automatically. It also takes a fair bit of time (~14 seconds for > a colour display) during which period access to the ePaper is 'locked > out' so the application really does need to be aware of what is going on. > > My intention is to add an nx_updatedisplay() API...but is there a > better, or already available, way to do this? It could be done via a > call to nx_setvisibility on the background window I guess, but > personally I don't like overlaid semantics like that... > I'm not expert on graphics, but I think you can use the redraw in the nx_callback to do it. Please take a look at apps/examples/nxlines, mainly on it: const struct nx_callback_s g_nxlinescb = { nxlines_redraw, /* redraw */ ... BR, Alan
