RE: TMS320F280049C: General CLA questions

Note: I split your new questions into a new thread.  This helps us track the questions and resolution.  In the future you can select "ask a related question" or "ask a new question" - this would be very helpful and will help TI track the question(s) and resolution.  Sometimes follow-on questions to a resolved thread are missed unfortunately.

Bilal,

I feel the following resources will be helpful to you.  You will find the first two on the product folder for the TMS320F280049C

• The data manual for the F280049C: This has information regarding the memory blocks on the device, their location and how they can be accessed. 
• The Technical Reference manual for F280049C: This has more detail on the CLA features on this device.
• The CLA workshop https://training.ti.com/control-law-accelerator-cla-hands-workshop  This is for an older device, but still a very good introduction to the CLA.  One new, very useful, feature on F28004x is the ability to make task 8 a background interruptable task.

Q: If I run CLA and main CPU then how can I make the work synchronously?

A: The CLA tasks run when triggered.  The trigger can occur by the main CPU or by a peripheral.  For the list of peripherals refer to the technical reference manual for the specific device.

In the example (cla_ex1_adc_fir) the CLA task 8 is triggered by the CPU and the trigger source for task 1 is the ADC.  Look in the code for the following lines:

    CLA_setTriggerSource(CLA_TASK_1, CLA_TRIGGER_ADCA1);
    CLA_setTriggerSource(CLA_TASK_8, CLA_TRIGGER_SOFTWARE);
    CLA_enableTasks(CLA1_BASE, (CLA_TASKFLAG_1 | CLA_TASKFLAG_8));
    CLA_enableIACK(CLA1_BASE);
    CLA_forceTasks(CLA1_BASE, CLA_TASKFLAG_8);

Q: In reference to above example, each time CLA_Task1 is called the main cpu executes a CLA_task1 ISR where the data is collected by the CPU_1. Is there any way to avoid ISR so that the main CPU can work without interrupts from CLA. 

A: Yes, at the CPU level you would not enable the CLA end of task interrupt.  i.e. comment out this line:

  Interrupt_enable(INT_CLA1_1);

Q: Are there any more ways to give data to the main CPU. for example, I make an array in CLA and just pass its address to main_CPU?

A: Any scheme which passes values through the memory can be used.  It is up to you to define.  

Q: While I am using CLA, I am short of memory. I am using all 8 LS RAMs. Can I increase it further by including other memories?

A:  Refer to the memory map section in the data manual for the specific device.  Here you will find which memory blocks can be configured for the C28x, the CLA or both.

Q: I want to store the data using DMA. Is there any DMA example for this platform, using CLA?

A: Refer to the memory map in the data manual for the specific device.  Here you will find which memory blocks can be accessed by each of the masters: C28x, CLA and DMA.  

Note: 

There is an error in the technical reference manual (TRM). It mentions a DMA to CLA message RAM. This feature is not present on the F28004x device. I have filed a ticket to have the document corrected. The data manual memory map is correct.

Regards

Lori