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CC2543: Could not get the Semaphore when set the RF

Guru 24520 points
Part Number: CC2543

Hi TI Experts,

Please let me confirm the following question.
[Question]
According to the customer, this device need to get the semaphore when set the RF. Is this true?
They said that their system could not get the semaphore in this case. Could you think of anything that might have caused it?

Best regards.
Kaka