Handling of unsigned integers

[molnarg]

It looks like currently, all registers are handled as unsigned numbers. In some use cases, I have signed integers, and option to handle them as such would be welcome. Or maybe a plugin to convert unsigned to signed. Thanks!

[BlackZork]

There is std.int32 converter, but its name is misleading - it supports merging two registers into a single u_int32 value, not converting uint to int. I will rename it to std.uint32.

To get a signed value you can just substract 65536 from register value. I just added unittest example in b5f17ac03efc038c32716887c5567c462b856e84.

[molnarg]

Thanks! It's a bit more complicated though. Only need to substract 65535 if the highest bit is 1, otherwise it shouldn't be done. Can I do it with an expr.evaluate call?

[molnarg]

I could do it this way:

converter: 'expr.evaluate("R0 < 32768 ? R0 : R0 - 65536")'

Feels a lot like a hack, so a native feature would still be welcome, but for my little side project more than enough :)

[BlackZork]

Ok, I will leave it open until adding simple cast to int16_t to stdconv.

[BlackZork]

Added int16 converter in https://github.com/BlackZork/mqmgateway/commit/4444b8a4240f8e184970fc31dc19bcfde08c366b