[Request] Can you please add a sample of direct access to framebuffer pixel data?

Hi, is it possible to access to the display's framebuffer pixel data to do some basic drawing stuff without gxm?

I just need to do the following:

1. Setup the display in RGB565 format.
2. Get a pointer to the framebuffer pixel data.
3. Do some drawing.
4. Swap buffers (if necessary)
5. Wait for vblank.

Can you please add a sample for it?  Or does anyone know how to do it?