Rockbox

This is something I’ve been meaning to do, but hadn’t gotten around to it yet.

Since you’ve already got a program to generate the tables and scale (in C, no less) - why not simply generate the tables at the start of the plugin? That allows the plugin to run on any screen size and be automatically scaled, preventing more work for future models and lots of #if/#elses.

I was originally planning on calculating in the plugin - the problem is I’m using log10 (although any log function will do, it can always be converted) and sqrt - I spent awhile trying to get some fixed-point log implementations to work, but I couldn’t get any meaningful output from them. No idea what I was doing wrong, but I’ve got them here if you want a look.
Anyway, attached is the quick and dirty bit of code for doing the calculations, plus the plugin with updated values.

I’ve got no idea what to do with the digital meter, there is a lot of screen real estate to fill…

   calc_vu.c (0.8 KiB)
   vu.patch (10.9 KiB)

Ah.. maybe somehow a method could be formulated for this, using e.g. a sine function (which I already use in my clock plugin, and the same function can be found in a number of places).

As for the digital meter, simply larger bitmaps are probably best for now - which I’d be happy to do.

Version using fixed-point log and sqrt.
The analog_db_scale is off a bit - it really needs log10 instead of log.

Midkay, if you could do the bitmaps that would be great - I’m not really any good at making things look nice :)

   vu.patch (10.1 KiB)

Fixed the analog_db_scale - analog side is (I think) as it should be now.

   vu.patch (10.1 KiB)

Now also fullscreen the digital scale - uses lcd_fillrect instead of handmade rounded rectangles.

   vu_meter.patch (14.3 KiB)

Parentheses police.

   vu_meter.patch (16.3 KiB)