TMS320F280049: Any example code for data exchanging between CLA and C28x?

Mark Chiu

Part Number: TMS320F280049
Other Parts Discussed in Thread: C2000WARE

In C2000Ware 1.0.6, We have there example code in \driverlib\f28004x\examples\cla , learning about trigger Task in CLA and interrupt C28x at end of Task.

However, It makes no mention of transfetring the result value of "filter_out" to C28x.

Is any sample code for data exchanging using MSGRAM?

Since dataram of CLA (.bss_cla) is located at LSRAM and C28x can access LSRAM.

Can C28x/CLA get parameter value of CLA/C28x by pointing to the adderss of LSRAM rather then use MSGRAM?

over 6 years ago

0 Pierre Bouchet1 over 6 years ago

Expert 2575 points

Hi Mark,

You can indeed use the LSRAM to share variables between the CPU and CLA but you need to select the adequate configuration using the LSxMSEL registers.

Also note that the arbitration scheme is based on a round-robin for the LS RAM so both the CPU and the CLA can sometimes incur a delay when accessing variables in a shared RAM concurrently.

Regards,
Pierre

0 Vasudha Bhadoria over 6 years ago

TI__Genius 10845 points

Hi Mark,

In the example, the variable "filter_out" is placed in CLA1toCPU message RAM wherein CLA has read & write access and CPU has read access. There is no need to do explicit data transfer to C28x. Refer below link for more details:
processors.wiki.ti.com/.../Control_Law_Accelerator_(C2000_CLA)_FAQ

Thanks
Vasudha

0 Mark Chiu over 6 years ago in reply to Pierre Bouchet1

Prodigy 30 points

Hi Pierre,

Thanks for providing this information.
I will try this later.

Regards,
Mark

0 Mark Chiu over 6 years ago in reply to Vasudha Bhadoria

Prodigy 30 points

Hi Vasudha,

That film is really helpful to me!
I think it can work on my issue, though there are few reference materials about CLA "Type-2".

Thank you again
Mark

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TMS320F280049: Any example code for data exchanging between CLA and C28x?