Boot | C31 | TMS320VC33 | VC33

Hi,

I am new to this platform.
I am using the tms320vc33.
I am using code composer version.4.10.36

I have written an inialization code in (C and asm) for dsp.
When I startup, the cpu registers are showing some default values and not zero.

If I start to trace with these values, at the end of some function calls the
trace goes to some unspecified location.

But if I make the cpu registers zero and load another .out file of another
project, then the trace works fine.

I guess some setting is changing, and I would be thankful to u if you could
point out what is wrong.something to do with memory mapping?

Thanx
Bhaduri

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Hello Bhaduri

Look for C_INT00 in the compilers source library.  When the CPU is reset 
most of the regsiters are not set to any particular value.  In 
particular the compiler needs to establish some of these registers for 
its run time stack, data page and perform a copying process where load 
time data is copied to the run time address.  By looking at the C_INT00 
code you should begin to see how the C-environment works.

By 'zeroing the registers' all you have done is set the base address to 
zero.  When objects are created, the also happen to start with a default 
starting point of zero.  If you then forget to specify a linker command 
file everything is refrenced to zero.  And, if your target system is in 
uP mode and has memory starting at zero... at appears to work.  But this 
may not be what you intended.  Maybe you missed linking your objects?

How do I know this?  When the C30 EVM was the norm for everyone learning 
this architecture, this was a simple way for everyone to get a piece of 
code up and running without using the linker.

Regards,
Keith Larson
Smith & Larson Audio
www.woofertester.com

b...@yahoo.com wrote:

> Hi,
>
> I am new to this platform.
> I am using the tms320vc33.
> I am using code composer version.4.10.36
>
> I have written an inialization code in (C and asm) for dsp.
> When I startup, the cpu registers are showing some default values and 
> not zero.
>
> If I start to trace with these values, at the end of some function 
> calls the trace goes to some unspecified location.
>
> But if I make the cpu registers zero and load another .out file of 
> another project, then the trace works fine.
>
> I guess some setting is changing, and I would be thankful to u if you 
> could point out what is wrong.something to do with memory mapping?
>
> Thanx
> Bhaduri
>
>  

______________________________
New Code Sharing Section now Live on DSPRelated.com. Learn about the Reward Program for Contributors here.



(You need to be a member of c3x -- send a blank email to c3x-subscribe@yahoogroups.com )