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bare metal interrupt handler

Scott Nowell
Intellectual 330 points
Other Parts Discussed in Thread: TDA2

is there info or samples for bare metal interrupt handling?

I am trying to use interrupts on the C66x DSP1 core on the TDA2 (XC5777X CPU BOARD).

I have tried the timer example from the starterware and it configures the timer and interrupt functions, but I get exactly one interrupt.  The timer is in auto reload mode and seems to be counting and reloading properly.

I can’t make sense of the interrupt though. In previous C64xx projects I have had a vector.asm file that contained the reset, nmi and 12 vectors for the chip interrupts.  On the C66x with the starterware code there is a lot added to configure the interrupt crosspoint and handlers.  I’m not sure if it needs the vector.asm or not.  When I add the vector.asm it is getting located at 0x00800000 and the ISTP is set to the same.  When the first interrupt occurs, it branches to a vector at 0x00800220.  The DSP ISR is showing a value of 0x0040 indicating vector 6.  With a vector for ISR6, I would expect it to be at 0x00800060.

What I can’t find documented is whether this should dispatch through some predefined function that uses the inth_handler table or whether I should just branch to my handler directly.  I "think" the starterware is assuming dsp-bios is running but it is not in this case.  

Scott

  • 0
    TI__Guru* 81335 points

    Hi Scott,

    Welcome to the TI keystone E2E forum. I hope you will find many good answers here and in the TI.com documents and in the TI Wiki Pages (for processor issues). Be sure to search those for helpful information and to browse for the questions others may have asked on similar topics (e2e.ti.com). Please read all the links below my signature.

    We do not have Starterware package/support for C66xx (Keystone ) DSP's. The only support available for C66xx DSP's (Keystone I) is MCSDK 2.x. Please find the latest MCSDK and user guide link below my signature.

    is there info or samples for bare metal interrupt handling?

    I am trying to use interrupts on the C66x DSP1 core on the TDA2 (XC5777X CPU BOARD).

    We are not familiar with this platforms however i can point you to some CSL based examples for interrupt on C66xx keystone devices. By understanding that, you can be able to develop your own example.

    Thank you.