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pub unsafe fn sd_clock_hfclk_request() -> u32
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@brief Request the high frequency crystal oscillator.

Will start the high frequency crystal oscillator, the startup time of the crystal varies and the ::sd_clock_hfclk_is_running function can be polled to check if it has started.

@see sd_clock_hfclk_is_running @see sd_clock_hfclk_release

@retval ::NRF_SUCCESS