Re: dot matrix display infrastructure

[Ilija Kocho]

On 11.01.2012 16:41, Tomas Frydrych wrote:
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?

Maybe you could first check the Framebuffer. It may be overkill for 
small displays but it might be possible to extract functionality that 
you need.

Tomas