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whether uart works or not without external 32.768Khz crystal

user4444965
Prodigy 230 points
Other Parts Discussed in Thread: CC2540

Hello ,

If we do not use the external 32.768KHz crystal , does the uart of CC2540 work well ?

Now I want to check whether the external 32.768KHz crystal works or not, if it does not start , I want to send something to main MCU using UART , can i do that ?

  • 0
    TI__Guru** 105180 points
    Hello,

    The 32kHz crystal is needed for sleep/wakeup timing. Are you enabling POWER_SAVINGS in your project?

    Best wishes
  • 0 in reply to JXS
    Prodigy 230 points

    Thank you .

    Now I am just testing. At the beginning of the project, I do not enable POWER_SAVING, it does not run ble_stack. I just want to test whether the UART can work or  not without enabling any clock.My real purpose is that if the uart can run, i can use it send some information to main MCU to indicate some clock not run well ,if needed. The example code like this:

    void main(void)

    {

    check 32.768Khz start ot not.

    if ( start) 

    goto normal project,which runs based on BLE_stack

    else if (not start)

    uart initialize

    while(1)

    sending some bytes to main MCU  to inform this external crystal does not work

    }

    whether does the above example  run or not ?