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ISR written in asm

Valdis Ivanov
Prodigy 140 points

Other Parts Discussed in Thread: CONTROLSUITE

Hi all !   I have created asm function, which called from other C-file:


.ref gvar
.global _int_TINT2

.text

_int_TINT2:
ASP
NASP
LRETR

.end

But  Errors was generated during compilation:

"../my_isr.asm", ERROR! at line 2: [E0002] Invalid mnemonic specification
.ref gvar

"../my_isr.asm", ERROR! at line 3: [E0002] Invalid mnemonic specification
.global _int_TINT2

Thanks  in advance!

  • 0
    Genius 5885 points

    Hi Valdis,

    I suspect you are missing whitespace/tab before the assembly directives. If that is the case the assembler should also have problems with your instructions.

    Unlike C in assembly whitespace is a part of code, where labels are at the beginning of line instructions should be at leas one whitespce/tab away from the beginning of the line and operands should be at least one whitespace from instruction.

    Regards, Mitja

  • 0 in reply to Mitja Nemec
    Prodigy 90 points

    Hello Mitja,

    Could you provide an example of ISR written in assembly?

    My intention is to achieve the so called "naked ISR" without automatic context save... If there is such possibility for C28x in CCS4, it will be very helpful for me!

    Thanks in advance!

    Kristian

  • 0 in reply to Kristian Dilov
    Genius 5885 points

    Take a look at www.ti.com/lit/an/spraan9a/spraan9a.pdf‎

    Regards, Mitja

  • 0 in reply to Mitja Nemec
    Prodigy 90 points

    Thank you Mitja for your proposal!

    I have a projet where I have to mix C and asm files and pretty new in TI TMS320(F28335) on the other hand :-). I couldn't find a description how to organized the asm file, where the ISR is accomodated. Could you provide me such documentation!

    Second questions is relatd to context save/restor. Is the model described in , "Example 24. Low-Priority Interrupt Service Routine Context Save" is complete (including the automatic context save/restore) and will save the complete context, including the FPU?

     

    Thank you for your support!

    Regards

    Kristian

     

  • 0 in reply to Kristian Dilov
    Genius 5885 points

    Hi Kristian

    I am sorry, but I do not have any examples of mixed project.

    The example 24 does full context save and restore.

    Regards, Mitja

  • 0 in reply to Mitja Nemec
    TI__Guru 57255 points

    Hi Kristian,

    I might recommend taking a look at the following controlSUITE project:
    \controlSUITE\development_kits\Multi-DCDC-Color-LED-Kit_v1.0\LED-ColorMix\

    This project's configuration and 'slow loop' is coded in 'C' whereas the main ISR was written in assembly.  The project isn't a perfect match for you since it is based on the fixed-point (and smaller) F28027, but it may at least serve as a decent reference for you.

    Good luck on your project!


    Thank you,
    Brett

  • 0 in reply to Brett Larimore
    Prodigy 90 points

    Mitja, Brett,

    Thank you for your support! It looks promising!

     

    Regards

    Kristian