dot matrix display infrastructure

[Tomas Frydrych <tf+lists.ecos@r-finger.com>]

Hi,

I am working on a driver for the Freescale Kwikstik LCD, which is a
segment lcd organized as a dot matrix. As part of that, I have
prototyped a simple system for drawing text, consisting of a couple of
minimal bitmapped fonts, a simple font generation tool, and a
rudimentary API.

I am wondering whether rather than bundling such API into the Kwikstick
slcd driver package, it would be beneficial to split it out and have a
common API in io/dmd/ along the lines of:

  typedef struct cyg_dmd_device_s cyg_dmd_device;

  cyg_dmd_set_pixel (const cyg_dmd_device *display,
                     bool on,
                     uint x, uint y);


  typedef struct cyg_font_s cyg_font;

  cyg_dmd_draw_string (const cyg_dmd_device *display,
                       const cyg_font *font,
                       const char *text,
                       uint x, uint y);

and perhaps also something like

  cyg_dmd_shift_horizontal (const cyg_dmd_device *display,
                            bool rotate,
                            int pixels);

and then driver implementations in devs/dmd/<some/hw>.

Any thoughts?

Tomas