nrf5340 processor scaling

[ShuMan]

Hi,

We are using nrf5340 and nrf connect SDK V2.0.0

Using below code, we are able to scale up/down the processor frequency.

	printk("CPU clock during booting: %u MHz\n", SystemCoreClock/MHZ(1));
	printk("NRF_CLOCK_S.HFCLKCTRL:%d\n",NRF_CLOCK_S->HFCLKCTRL);
	
	printk("Switching application core from 64 MHz and 128 MHz. \n");
	nrfx_clock_divider_set(NRF_CLOCK_DOMAIN_HFCLK, NRF_CLOCK_HFCLK_DIV_1);
	printk("NRF_CLOCK_S.HFCLKCTRL:%d\n",NRF_CLOCK_S->HFCLKCTRL);

	printk("Switching application core from 128 MHz and 64 MHz. \n");
	nrfx_clock_divider_set(NRF_CLOCK_DOMAIN_HFCLK, NRF_CLOCK_HFCLK_DIV_2);
	printk("NRF_CLOCK_S.HFCLKCTRL:%d\n",NRF_CLOCK_S->HFCLKCTRL);

However, in our application we want to use the processor at frequencies based on our needs (Ex. 48, 64, 96, 128 MHz).

So, please let me, how can we do that?

Thanks

[Elfving]

Hello Shubham, sorry about the delay

Unfortunately, those are your two options. Like it says in the Product Spec:

"The application core is a full-featured Arm Cortex-M33 processor including DSP instructions and FPU, running at up to 128 MHz with 1 MB of flash and 512 kB of RAM. The option to run the application processor at 64 MHz allows the CPU to increase energy efficiency."

Regards,

Elfving