Help:How to save floating point variables in CodeCompStudio

[vinod_261]

Hello friends,

Ref: Code composer studio 3.1 for C6416.

I wish to know how to save floating point variables
in floating format to a file using 'File->Data->Save'
option in CCS.
(I know how to save the integers and read it through Matlab).


For example the value 215.3560 must come in the file as
215.3560 only. Not as a Hexadecimal number.
Is there any provision for this in CCS.

Or

I wish to know the exact formatting of floating point numbers
so that I can read it by matlab.

Can anybody help me on this regard.

Regards,
Vinod

 

[mowgli]

Re: Help:How to save floating point variables in CodeCompStu

The floating point implementation is in compliance with IEEE 754 standard, hence

sign exponent mantissa
32-bits 1 8 23
64-bits 1 11 52

More info if you browse in the Contents of CCS on line help searching for
"floating-point fields".
To save it in a file you could use the printf C function, but if you run on the target I presume that this would excessively slow down the execution of your program, thus violating the real time constraints (if any).
More effective solution could be use of the DSP-BIOS Log objects in conjunction with a CCS IDE Log window set to save the displayed log results in a text file. Be sure that each time you call the Log_printf( ) API function to print a Float value only 1 placeholder %f is placed in the input string (e.g Log_printf( "My float value is %f", floatValue ) ): I observed corruption of the displayed values when trying to print other variables in presence of the placeholder for float format.

Regards
Mowgli