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CC2538: Use the 32kHz Crystal Oscillator

rei
Mastermind 6135 points
Part Number: CC2538
Other Parts Discussed in Thread: , SMARTRF06EBK, TIMAC, Z-STACK

Hi,

I want to use a 32kHz Crystal Oscillator (External 32kHz) on my CC2538. Can I just use the following setting?

SYS_CTRL_CLOCK_CTRL:OSC32K bit 1 -> 0

Regards,

Rei

  • 0
    TI__Guru**** 202256 points

    Hi Rei,

    This is the necessary action in accordance with Section 7.2.2 of the TRM but I recommend using the SysCtrlClockSet API.

    Regards,
    Ryan

  • 0 in reply to Ryan Brown1
    Mastermind 6135 points

    Hi Ryan,

    Thank you for your reply. I used the EVM and PER TEST example and changed bsp.c

    //SysCtrlClockSet(false, false, ui32SysDiv);
    SysCtrlClockSet(true, false, ui32SysDiv);

    ・CC2538EMK
    ・SMARTRF06EBK
    ・CC2538 PER Test (v1.1.0) (Rev. A)

    But External 32kHz is not oscillating, and SleepTimer count does not increase either.
    What else should be set?

    Regards,

    Rei

  • 0 in reply to rei
    TI__Guru**** 202256 points

    Make sure that ui32SysDiv is within the allowable range (zero to seven), analog functionality of the pins has been selected (see this relevant E2E thread), and that the crystal is capable of working properly.  It can be checked against TIMAC or Z-STACK examples which enable it by default.

    Regards,
    Ryan