Register decoding does not work correctly when fields are represented in msb0 mode

[maltaisn]

When entering a value in the "Encoded Register Value", the decoding doesn't work correctly. For this RDL source:

addrmap registers {
  default regwidth = 32;
  default memwidth = 32;
  default accesswidth = 32;

  reg {
    name = "Version";
    field {} VERSION_REVISION[0:7];
    field {} VERSION_BUILD[8:15];
    field {} VERSION_MINOR[16:23];
    field {} VERSION_MAJOR[24:31];
  } version;
};

Example result:

I'm also not sure what behavior is expected when entering a field value. The field text field always goes red it seems.

I'm using peakrdl-html v2.10.1 and Firefox. Also fails in Edge.

[amykyta3]

Thanks for reporting this!

This is definitely a bug, but there's actually a few things going on here.

SystemRDL defines this strange register packing mode called "msb0 mode" which means that the upper bit of a register is the least-significant bit instad of most-significant. You can switch to this mode explicitly by using the msb0 property, or infer it by using [low:high] bit ordering.
Assuming that using msb0 mode was not your intention, try flipping your fields to define bit-order using the lsb0 notation of [high:low]. That is more conventional for field definitions and I assume is what you intended.

  reg {
    name = "Version";
    field {} VERSION_REVISION[7:0];
    field {} VERSION_BUILD[15:8];
    field {} VERSION_MINOR[23:16];
    field {} VERSION_MAJOR[31:24];
  } version;

All that said, this is definitely a bug in the HTML generator - it ought to be able to support the alternate msb0 bit-mode correctly.