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Original question:

CCS/TMS320F28035: Unwanted Loop back in SCI

CCS/TMS320F28069: Char Array Memory Allocation in 16-bit Memory

rjb
Intellectual 470 points
Part Number: TMS320F28069

Tool/software: Code Composer Studio

Hello, 

I am working on TMS320F28069 C28x.

I  

I have created an array of char as can be seen from the image above for 8-bits datatype it takes 16-bits memory and higher byte is empty.

Any suggestions on how to pack it in memory -> 8 bits side by side. Is there any way of telling compiler to do that ?

Thanks,

Rahul

  • 0
    TI__Guru** 114200 points
    You might have a look at the chapter of C compiler user's guide as the following link. The data type, char or signed char is 16 bits size for C2000.
    www.ti.com/.../spru514r.pdf

    I am working to find the compiler expert to help you. This may take some time to reach the right person depending on availability. Please expect an update over the weekend. I appreciate your patience.
  • 0 in reply to Yanming Luo
    Intellectual 470 points
    Thanks for getting back on this Yanming,
    I am waiting and eager to find out optimization, I can surely do this by adding few lines of code to do that. But, I want to know if there is any intrinsic compiler option for this.

    I also used __attribute__((__packed__)) for structure allocation of two characters (not for char array) it didn't pack two chars together, still had two different locations.

    Thanks,
    Rahul
  • 0 in reply to rjb
    TI__Guru**** 244280 points

    The C28x compiler does not support a built-in type that is 8-bits wide.  To understand how you can do 8-bit wide operations from C code, please see the article Byte Accesses with the C28x CPU.

    Thanks and regards,

    -George

  • 0 in reply to George Mock
    Intellectual 470 points
    That's helpful George thanks.