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CODECOMPOSER: CCS unsigned integer error (TMS320F28P650DKP)--> register view vs expression window difference

Uttam Reddy Pailla
Expert 6020 points
Part Number: CODECOMPOSER
Other Parts Discussed in Thread: TMS320F28P650DK

Hello,

I am using TMS320F28P650DK device on CCS 12.5.0. I observe a difference between register view (vs) expressions window for the same CMPSS1regs.RAMPHREFS or CMPSS1regs.RAMPHREFA or CMPSS1REGS.RAMPHSTS

Please let me know at the earliest.

Best Regards,

Uttam

  • 0
    TI__Guru**** 451271 points

    Hello,

    The values are actually the same, it is just that the Expressions view will show the value as a signed decimal value while the Registers view will show it as unsigned decimal.

    Thanks

    ki

  • 0 in reply to Ki
    TI__Expert 6020 points

    Hi Ki,

    In that case, just the 15th bit is what defines the signed/unsigned. 

    Assuming that's been removed still the decimal value is different what i observe in the expression window. 

    Example: 

    hex= 0xCCCC

    BIN= 1100 1100 1100 1100 (52428 decimal) (assuming the 15th bit is taken away) --> 0100 1100 1100 1100 which is still 19660 decimal.

    But in the expression window instead of 19660 i see 13108 (decimal). Why the value is different here. 

    2Q). Why this only happens to specific registers in expression window?

    Best Regards,

    Uttam

  • +1 in reply to Uttam Reddy Pailla
    TI__Guru**** 451271 points
    Uttam Reddy Pailla said:
    BIN= 1100 1100 1100 1100 (52428 decimal) (assuming the 15th bit is taken away) --> 0100 1100 1100 1100 which is still 19660 decimal.

    It doesn't quite work that way.

    Please see below for full details (and a calculator:

    https://onlinetoolz.net/unsigned-signed#base=10&value=52428&bits=16

    Uttam Reddy Pailla said:
    2Q). Why this only happens to specific registers in expression window?

    Typically most people prefer to use hex or unsigned int (decimal) when working with registers. However it is understandably confusing due to the inconsistency between the expressions and registers view

    Our new CCS Theia IDE will be consistent and default to signed for both views.