Re: Linux support for a 7 segment LED display

[Geert Uytterhoeven]

Hi Andy,

On Fri, Feb 23, 2024 at 1:36 PM Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
> On Fri, Feb 23, 2024 at 9:52 AM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
> > Note that most larger displays are not individual LEDs, but matrices
> > of LEDs. Do we want to drive/scan them from software, using a
> > gpio-7seg-matrix driver?
>
> LED matrices are the displays (like tinyDRM is for).

TinyDRM is for rectangular matrices.

Multiple 7-segment displays are usually multiplexed using a matrix,
using 7 (or 8) lines shared by the corresponding segments of all
displays, and one common line per display.
https://embedded-lab.com/blog/wp-content/uploads/2011/03/Lab11_Circuit_SevenSegmentMultiplexing.jpg

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68korg

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds