CCS/TMS320F28335: structure data alignement

Hi Ras,

Ras Sharif50 said:

- is this for alignment reason which one bit or some bits be defined as Uint16?

- why Uint16 rather than Uint32?

ADCTRL1 is a 16-bit register and hence Uint16 as Uint32 doesn't make any sense here.

If you observe the above register, the same has been implemented in the above code.

Regards,

Gautam

first, i don't understand for example "Uint16 CPS:1;" while the CPS is a bit!

Ras Sharif50 said:

first, i don't understand for example "Uint16 CPS:1;" while the CPS is a bit!

Ohhk, let me explain: In the above example of ADCTRL1 - 16bits are broken bitwise. If you compare the structure and the above ADCTRL1 register, CPS is assigned only 1bit ie 7th bit. Similarly, SUSMOD is assigned 2bits ie 12th and 13th. I hope you understood. Try linking the structure and Figure 2-1

Regards,

Gautam

The CPS ( for example ) is defined as Uint16, so it occupies 16 bits in memory!

don't i say true?

thank you Gautam,
i received the answer to my three first questions.
can i question an other question:
where does in a ccs project, the data structure be aligned?

regards,
Ras

Ras Sharif50 said:

where does in a ccs project, the data structure be aligned?

In all the peripheral header files.

it is not my meaning.
in some compilers, the structure alignment is done by ALIGN directive. I am finding it in ccs projects.

Hello,

The peripheral structures are are assigned to a linker data section (in DSP2833x_GlobalVariableDefs.c) and then those sections are assigned to their specific location in memory (in DSP2833x_Headers_nonBIOS.cmd).

Best Regards
Chris

how the boundary ( 32 bits ) is set with the compiler?