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F28069 controlStick does not wake up from Idle LPM

Louis Zhu
Expert 1685 points
Other Parts Discussed in Thread: CONTROLSUITE

I tried to exercise LPM mode on my F28069ControlSTICK, I was able to wake it up from Standby mode and Halt mode by jumping GPIO12 to ground momentarily, however, when I configure SysCtrlRegs.LPMCR0.bit.LPM = 0; i.e., Idle mode, I was unable to wake it up by pulsing on GPIO12. The program stays at this line.

__asm(" IDLE");

I had WAKEINT enabled. Everything else was the same, only LPM bit changed.

Please help me understand why Idle mode is different from Standby and Halt mode. I thought Idle mode should be the easiest to wake up.

Thanks!

  • 0
    Guru 192875 points

    Hi,

     when I configure SysCtrlRegs.LPMCR0.bit.LPM = 0; i.e., Idle mode, I was unable to wake it up by pulsing on GPIO12.

    Hi, you won't be able to wake it up from idle mode using GPIO! Here's why:

    Use XRS or a Watchdog interrupt for IDLE condition. Also please go through "1.3.3 Low-Power Modes Block" in SPRUH18D document named F2806x Technical Reference Manual.

    Regards,

    Gautam

  • 0
    Guru 20525 points

    Hi Louis! (Hi Gautam)

    From above Table it follows you can use  "any enabled interrupt". Thus you need to associate GPIO12 with one from external interrupts XINT1/XINT2/XINT3. How to do it you can look at example here ti\controlSUITE\device_support\f2806x\v136\F2806x_examples_ccsv5\external_interrupt\.

    Regards,

    Igor 

  • 0 in reply to Igor Gorbachev
    Expert 1685 points

    Thank you, Gautam abd Igor, for your timely instructions. That really helps.

    I was misled by TI's Multi-Day Training material, C28x_Microcontroller_MDW_4.0, seen on both pdf (p. 5-15) and ppt (slide 30).

    Correct technical documentation is so important!

  • 0 in reply to Louis Zhu
    Guru 192875 points

    Correct technical documentation is so important!

    Very true! Atleast you figured it out :)

    Cheers for that,

    Gautam