TMS570 VIM Module - Interrupt Enable

Brent,

Normally these CPU and CP15 operations are carried out at the very beginning of the code in assembly. (See for instance sys_core.asm in the files that accompany the application note on device initialization -- link below.) 

If you need to do this within a C environment, you can use the syntax

asm(" code");

You'll also need to use compiler options that reserve one of the CPU registers so that the code has a register that can be used.

However, it is overall preferable to take care of these items in initialization.

http://focus.ti.com/mcu/docs/litabsmultiplefilelist.tsp?sectionId=96&tabId=1502&literatureNumber=spna106a&docCategoryId=1&familyId=1931

Regards,

Forum Support

Hi Kevin,

Could you provide me with the sys_core.asm file? I just want to look inside it.

Is it possible to use HALCoGen  to config interrupts (including setting CPU's CPSR and SYS registers)?

Thanks,

Brent Shen

Hi Jean-Marc,

Thank you for the info above. I checked the _enable_FIQ() function. It enables both IRQ and FIQ. If I just want to enable IRQ only, can I use the following C statement in CCS?

asm("CPSIE i");

Please verify the format of the statement above for me. Also, if any settings should be done for compiler options, please let me know. Thanks again.

Regards,

Brent Shen

Brent,

Is there a reason you don't want to use _enable_IRQ() function in order to enable IRQ only?

Regards,

Forum Support

Hi Kevin,

In the sys_core.asm file,

    .def _coreEnableIRQ_
    .asmfunc _coreEnableIRQ_
         cps IE
         bx    lr

   .endasmfunc

In the ARM Architecture Reference Manual, the format of cps instruction is defined as

CPS<effect> <iflags> {, #<mode>}

where <effect> = IE or ID, <iflags> = a sequence of one or more of a, i, f.

So CPSIE is a whole keyword; however there is a space between cps and IE in the _coreEnableIRQ_ routine above. And <iflags> must be specified if <effect> is used.

In addition, I also just to make sure that asm("<assembly_instruction>") can be used if I need to use assembly in C.

Thanks,

Brent Shen

Brent,

I have forwarded this to the person who wrote the code because I certainly value the response that we may have an error. Thanks for the highlight.

You can use the assembly statement. The assembly statement in this case does not use any CPU registers, so that simplifies the case. I guess you could run into problems with overly optimized C-code but typically this is not a problem.

Regards,

Kevin Lavery

Brent,

From reviewing the thread, it appears as though your questions were answered for the most part. If there are follow-on questions to your original post, it would be greatly appreciated if you could open a new thread since I will close this thread at this point in time.