Question

Simple question, I have some customised java that allows to have 32 bit HW variables.
I would like to asign such a variable a constant 32-bit value, however, this command fails
in the following scenario:

HWINTVar a = const.var(toHWint(32), 0xf1234567);

but works in this scenario:

HWINTVar a = const.var(toHWint(32), 0x11234567);

The error message in the first case is that a critical number of bits can be lost in constant values, and the reason for this is that the constants that I am passing to this method are signed. Is there a simple way how I can tell in Java to interpret this constant value as unsigned values? I tried:

 HWINTVar a = const.var(toHWint(32), (unsigned int) 0xf1234567);
 HWINTVar a = const.var(toHWint(32), (unsigned integer) 0xf1234567);

but this obvioulsy cant work in Java as it does not support unsigned data types. Any idea how this could be done?

Cheers!

Answer 1

The only way to represent that constant correctly is as a long literal, i.e. 0xf1234567L

Assuming you are able, change the definition of const.var so that it takes a long for its second parameter, and extract the bottom 32 bits to put them in your HWINTVar.