CCS/TMS320F28035: Unsigned int library

sagar shah54

Expert 2125 points

Part Number: TMS320F28035
Other Parts Discussed in Thread: C2000WARE

Tool/software: Code Composer Studio

Hello,

Is there any way I can uint_8 data type(ie user defined datatype according to the bits) in my code for Tms28035?

Thanks

Sagar

over 7 years ago

0 Richard Poley over 7 years ago

TI__Mastermind 27200 points

Sagar,

The smallest representable data type on C28x is 16 bits. If you declare a "short int" or "char", which you might expect to be 8 bits in length, they will each occupy one 16 bit word in memory. There is nothing to stop you identifying an 8-bit data type, but expect it to actually occupy 16 bits.

We use defined 16-bit, 32-bit, and 64-bit data types for portability. These are defined in the header file "DSP2803x_Device.h", which you can find in the device_support section in C2000Ware.

Regards,

Richard

0 sagar shah54 over 7 years ago in reply to Richard Poley

Expert 2125 points

Thanks for the information! Is there any way I can declare a 24 bit Unsigned integer similar to Uint32. I mean I have a 24 bit data and would not like to use a 32 bit variable.

Regards,
Sagar

0 Richard Poley over 7 years ago in reply to sagar shah54

TI__Mastermind 27200 points

Sagar,

Unfortunately not. On C28x, the smallest addressable memory element is 16 bits and data buses are 32-bits wide, so you'd be reading two consecutive 16-bit data words to reach the 24-bit data. This is not normally a problem unless you have a lot of 24-bit data to handle.

Regards,

Richard

0 sagar shah54 over 7 years ago in reply to Richard Poley

Expert 2125 points

Thank you for the information. This makes things clear.

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CCS/TMS320F28035: Unsigned int library