Example C67x code for SWI / TRAP

Hi Joshua,

As per my knowledge we do not have other then CSL based example projects for C672x Devices.
Which you can download from below mentioned link.
http://www.ti.com/tool/sprc223

But for reference you can check with C674x starterware example projects and can develop your own code.

You can download starterware projects from below mentioned link.
processors.wiki.ti.com/.../StarterWare

Joshua,

Where did you find the references that you mentioned that call for CSL? I would like to understand the context of your concerns.

Normally speaking, SWI is a creation of DSP/BIOS, so it by definition only exists within DSP/BIOS and not otherwise.

If what you have found uses CSL, there is no reason I know of to avoid using CSL. It is just a collection of functions that you can use. There is no other overhead associated with pure CSL. In fact, you can just pull out a single function that you want to use and add that code to your own project as source code.

With your references, perhaps I will understand better what you have seen and found, and what feature of the C6726 you are trying to use.

Regards,
RandyP

Hi Randy,

I found that in a thread in DSP Forum. Below is my note from reading the thread. Not sure it is usisng CSL. It is not clear to me where I could register SWI as I did for interrup vector table. Is the following all I need to create a SWI and use it without DSP/BIOS? Thanks.

 

SWI TRAP Initialization:

  IRQ_clear(SINT31_EVENT);

  IRQ_plug(SINT31_EVENT, &SWI31Routine);

  IRQ_enable(SINT31_EVENT);

The interrupt routine has to be declared with interrupt keyword:

interrupt void SWI31Routine(void)

{...}

Calling the interrupt routine:

  asm(" INTR #31");

or

  asm(" TRAP #31");*/

Joshua

Joshua,

Sorry, but I cannot comment on an unknown thread somewhere in the forum. Without context for this, I cannot know how to clarify or correct anything.

In the C67x+ CPU & Instruction Set Reference Guide, I did not find either the INTR or the TRAP assembly instructions. Either I missed them in my search or the code you show is not for the DSP you are using.

IRQ_xxxx() functions are CSL functions.

If you are not using an OS like TI-RTOS, what do you need an SWI to do? What problem are you trying to solve that would not be solved by calling a function instead of defining it to be an SWI and then calling it?

Regards,
RandyP

Randy,

The place to call SWI or a function is in a interrupt service routine.
I want to minimize the ISR as small as possible. If I call a function it will finish the function before end of the ISR. If I trigger a SWI I can leave ISR and program counter would jump into SWI afterwards. Is there any way to solve that regardless with or without SWI. Thanks.

Joshua,

What you need is TI-RTOS (SYS/BIOS). That is exactly the scheduler that is the fundamental nature of an O/S, and TI-RTOS is a simple, configurable O/S that will do exactly what you need.

Otherwise, you will have to write your own scheduler. But I strongly recommend you re-look at using TI-RTOS and get your project built and running. The time you save will be considerable.

There is no instruction that will implement this feature.

Regards,
RandyP