nRF54L15 32Khz XO verify.

Hi nRF experts.

Is there any way to output 32khz to gpio? We need to verify the frequency offset of 32khz.

I saw that there is a ppi_trace sample code that seems to solve my problem, but this ppi_trace cannot be compiled on the nRF54L15 platform.
Can you let me know if there is any method that can be verified currently?
Thanks.

Top Replies

Emil Lenngren 3 months ago in reply to weiliwang +1 verified

You can't define your own NRF_GRTC_Type variable. You must use the one that is memory mapped to the actual hardware peripheral: NRF_GRTC.

Parents

0 Hung Bui 3 months ago

Hi Weili,
There is a new feature on the nRF54L that you can output the LKCLK and HFCLK to one of the GPIO pins.
Please take a look at the GRTC peripheral here: https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/grtc.html#ariaid-title5

The pin for LFCLK (32kHz) is P0.04.

We don't have an example to show this but you can just set the register directly or use the nrf_grtc_clkout_set() function in the nrfx_grtc driver.

0 weiliwang 3 months ago in reply to Hung Bui

Hi Hung.

Sorry, this is our first time contacting the nRF platform.
I used the radio_test sample and added the following declaration after clock_init() of the main function. Is this correct?

#include <hal/nrf_grtc.h>
NRF_GRTC_Type NRF_GRTC_regs;
int main(void)
{
	int blink_status = 0;
	int err = 0;

	configure_gpio();

	memset(&NRF_GRTC_regs, 0, sizeof(NRF_GRTC_Type));
	NRF_GRTC_regs.CLKCFG = (0x00000000UL);
	NRF_GRTC_regs.CLKOUT = (0x00000001UL);

	nrf_grtc_clkout_set(&NRF_GRTC_regs,NRF_GRTC_CLKOUT_32K,true);

	err = uart_init();
	if (err) {
		error();
	}

	if (IS_ENABLED(CONFIG_BT_NUS_SECURITY_ENABLED)) {
		err = bt_conn_auth_cb_register(&conn_auth_callbacks);
		if (err) {
			printk("Failed to register authorization callbacks.\n");
			return 0;
		}
	....
	....
	....
	...
}

I didn't see any waveform in P004, only a high level.
Please tell me if I missed any details.

SDK V2.8

nRF54L15 DK board .v0.8.1

Reply