pyuipc help needed : 32-bit float problem

[miguelito]

Hello all, first post here.

 

I'm using pyuipc with a python script. I can read correctly pretty much all the offsets, except I ran into a problem with 0x2aac : "CDI needle deviation".

 

Docs say it is a 32-bit float, range -127 to +127. Problem is, pyuipc only gives me the option of reading 1, 2, 4 or 8-byte integers, or 8-byte double floats.

 

None of these options seem to yield usable values.

 

Have I missed something ? Can someone kindly point me in the right direction ?

 

with pyuipc I use:

 

pyuipc.read(0x2aac,"f")

 

Any help is appreciated.

 

Thanks to Pete and Istvan for such useful modules.

 

- Miguelito

 

 

[Pete Dowson]

I ran into a problem with 0x2aac : "CDI needle deviation".

Docs say it is a 32-bit float, range -127 to +127. Problem is, pyuipc only gives me the option of reading 1, 2, 4 or 8-byte integers, or 8-byte double floats.

 

None of these options seem to yield usable values.

 

There are quite a lot of 32-bit floating point values in the interface, so I'm surprised that this "PYUIPC" program (which is new to me) hasn't encompassed those. The underlying Intel architecture supports both 32- and 64-bit floating point values directly, as do all of the Microsoft programming language family.

 

Anyway, there is a 64-bit version (relating to the HSI) at offset 2F88. I guess that should be the same value if VOR1 is selected -- you may need to check offset 2FAA as well, though, for validity.

 

If you don't need such accuracy (for instance, if it is only for display on a gauge) then the 8-bit (single byte) integer version at offset 0C48 should be used.

 

Regards

Pete

[miguelito]

0c48 seems to work fine. I'll just use this one instead, more than enough accuracy for my needs.

 

double(thanks, Pete)  :-)

 

PS : pyuipc is a Python wrapper distributed with the sdk, written by Istvan Varadi.