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Using a Timer under BIOS 5.x on 5535

james conway
Intellectual 780 points


Hi,

I'm designing software to run on a ez5535 board under BIOS. I need to use a Timer in my system and am confused about how timers are managed under BIOS 5.x. In section 2.4 of the TMS320C55X BIOS 5.x API document SPRU404P (CLK_Module), there is no reference to the C5535 part - how do know what timer resource BIOS reserves?

Is there a specific version of BIOS that should be used with the C5535x device?

The interrupt chapter of the 5535 technical reference document (SPRUH87C) (section 1.6), indicates the TINT interrupt vector at location 0x20, and also shows an RTOS interrupt vector at location 0xD0. What is the RTOS interrupt?

The tech ref documentation indicates that a single interrupt is shared amongst all Timers.If BIOS reserves a timer, I assume it owns the HWI interrupt handler that determines which Timer caused the interrupt and then makes the call to the appropriate ISR.. How do I "plug-in" my HWI handler for the Timer I want to use?

Thanks,

Jim

  • 0
    TI__Mastermind 23785 points

    Jim,

    Maybe it have been updated. I read SPRU404Q which has reference to C5535.

    CLK_setTimer       Func Assign function to a timer (C5505, C5515, C5517, C5535 only)

    http://www.ti.com/lit/ug/spru404q/spru404q.pdf

    I digged around and found DSP/BIOS 5.41.11.38 adds support for C553x devices. You can download via:

    http://software-dl.ti.com/dsps/dsps_public_sw/sdo_sb/targetcontent/bios/dspbios/index.html

    TINT is used for timers. Software needs to check Timer Interrupt Aggregation Flag Register (TIAFR) [1C14h] to see which timer causes the interrupt. It is documented in section 1.6.3. As far as  I know, the RTOS is for emulation. The only reference I can find is in C55x v3.x CPU reference Guide.

    Hope this help.

    regards.