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SLEEPCMD

Willy R
Prodigy 70 points
Other Parts Discussed in Thread: CC2530, CC2430, CC2540

The sample code for CC2530 uses exhaustively  SLEEP_OSC_PD_BM (value ix 0x04).

again its there in Figure 4-1. Clock System Overview.  (SLEEPCMD.OSC_PD)

But, OSC_PD is not defined in the register definition of SLEEPCMD.

Can some help me with the purpose of SLEEP_OSC_PD_BM used in the clockSetMainSrc () or pointers to what is this bit mask really achieving?

  • 0
    TI__Mastermind 21125 points

    Hi Willy.

    Do not know the sample code that well, but you need to update the User Guide. The latest version do not have this in Figure 4-1 and the bit set with this mask is set as Reserved. Always write as 1.

    Regards,
    Kjetil

  • 0 in reply to Kjetil
    Prodigy 70 points

    thank Kjetil.

    I noticed that very late. thanks anyways. But still don't understand the code. The comments and code are not in sync.

    Regards,

    Willy

  • 0 in reply to Willy R
    TI__Mastermind 21125 points

    Not sure what code you are looking at but best guess is that this is a left-over from previous code / chips (CC2430) where this bit had a meaning. Believe that in the CC2530 the clock not selected will automatically be powered down and that this bit/functionality was rendered useless.  Previously this was a 'manual' job.

    Regards,
    Kjetil

  • 0 in reply to Kjetil
    Prodigy 95 points

    The same SLEEPCMD register issue exists with the CC2540.  Version 1.1 of the CC2540 Bluetooth Low Energy Software Development Kit (CC2540 BLE v1.1) references OSC_PD as bit-2 of the SLEEPCMD register in the hal_board_cfg.h and hal_mcu.h files.  The User's Guide shows bit-2 of the SLEEPCMD register as Reserved (reference page 63 of SWRU191B (Sep 2010).