RE: How to identify the application clock frequency in nrf5340

SanketC — Wed, 18 Aug 2021 15:26:43 GMT

Hello Vidar,

Thank you for the reply. I will look into it and get back to you.

Best Regards,

Sanket C

RE: How to identify the application clock frequency in nrf5340

Vidar Berg — Tue, 17 Aug 2021 18:19:23 GMT

Hello,

The default CPU frequency is 64 MHz after reset. But it doesn't look like we have implemented any driver APIs to control the frequency yet, so I think you have to write directly to the clock control register as shown in my code snippet below.

	/* Set CPU frequency to 128 MHz.
	 * https://infocenter.nordicsemi.com/topic/ps_nrf5340/chapters/clock/doc/clock.html#concept_mcu_frequency_scaling
	 *
	 * Note: replace NRF_CLOCK_S with NRF_CLOCK_NS if CPU is running in the non-secure domain.
	 * /
	NRF_CLOCK_S->HFCLKCTRL = (CLOCK_HFCLKCTRL_HCLK_Div1 << CLOCK_HFCLKCTRL_HCLK_Pos);

Best regards,

Vidar