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CC2651R3SIPA: Inquiry about using External LF Clock on CC2651R3SIPA with TI-RTOS

Hiroki Saito
Prodigy 80 points
Part Number: CC2651R3SIPA

Tool/software:

Dear TI Support Team,

I am developing with the following environment:

  • MCU: CC2651R3SIPA

  • SDK: simplelink_cc13xx_cc26xx_sdk_7_41_00_17

  • OS: TI RTOS

I would like to use an External LF Clock as the 32 kHz low-frequency clock source instead of XOSC_LF. However, despite changing the settings in the syscfg file, I am unable to make it work. Even when connecting the debugger and starting, an error is displayed.

I am attaching a screenshot of my syscfg file. Could you please advise if there are other settings that need to be configured? Also, if there are any registers or other software changes required to enable the external LF clock, I would appreciate your guidance.

Thank you very much for your support.



Best regards,
Hiroki Saitoh

  • +1
    Prodigy 80 points

    Hi,

    Thank you again for your support.
    I was finally able to get the system working with the external low-frequency clock.

    It turns out the issue was related to the SDK version I was using.
    I was working with version 7_41, where the return type of CCFGRead_EXT_LF_CLK_DIO() was defined as bool, which caused the problem.

    After updating the SDK to version 8_30, the function returned the expected DIO value, and the external clock configuration worked correctly.
    I will consider installing the latest available SDK to ensure continued compatibility and support.

    Thanks again for your help!

    Best regards,