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[nrf fromlist] samples: boards: nordic: nrf_sys_event: Extend sample
Add part which is using event register and unregister functionality. Upstream PR #: 99377 Signed-off-by: Krzysztof Chruściński <[email protected]>
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‎samples/boards/nordic/nrf_sys_event/boards/nrf54l15dk_nrf54l15_common.dtsi‎

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/*
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* Copyright (c) 2025 Nordic Semiconductor ASA
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* SPDX-License-Identifier: Apache-2.0
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*/
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sample_counter: &timer20 {
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status = "okay";
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};

‎samples/boards/nordic/nrf_sys_event/boards/nrf54l15dk_nrf54l15_cpuapp.overlay‎

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/*
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* Copyright (c) 2025 Nordic Semiconductor ASA
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "nrf54l15dk_nrf54l15_common.dtsi"

‎samples/boards/nordic/nrf_sys_event/boards/nrf54l15dk_nrf54l15_cpuflpr_xip.overlay‎

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/*
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* Copyright (c) 2025 Nordic Semiconductor ASA
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "nrf54l15dk_nrf54l15_common.dtsi"

‎samples/boards/nordic/nrf_sys_event/prj.conf‎

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# SPDX-License-Identifier: Apache-2.0
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CONFIG_NRF_SYS_EVENT=y
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CONFIG_COUNTER=y
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CONFIG_NRF_SYS_EVENT_IRQ_LATENCY=n

‎samples/boards/nordic/nrf_sys_event/sample.yaml‎

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type: one_line
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regex:
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- "constant latency mode disabled"
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platform_allow:
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- nrf52dk/nrf52810
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- nrf52dk/nrf52832
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- nrf52833dk/nrf52820
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- nrf52833dk/nrf52833
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- nrf52840dk/nrf52811
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- nrf52840dk/nrf52840
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- nrf5340dk/nrf5340/cpuapp
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- nrf5340dk/nrf5340/cpunet
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- nrf54h20dk/nrf54h20/cpuapp
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- nrf54h20dk/nrf54h20/cpurad
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- nrf54l15dk/nrf54l15/cpuapp
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- ophelia4ev/nrf54l15/cpuapp
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integration_platforms:
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- nrf52840dk/nrf52840
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- nrf5340dk/nrf5340/cpuapp
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- nrf5340dk/nrf5340/cpunet
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- nrf54h20dk/nrf54h20/cpuapp
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- nrf54h20dk/nrf54h20/cpurad
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- nrf54l15dk/nrf54l15/cpuapp
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- ophelia4ev/nrf54l15/cpuapp
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tests:
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sample.boards.nordic.nrf_sys_event: {}
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sample.boards.nordic.nrf_sys_event:
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platform_allow:
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- nrf52dk/nrf52810
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- nrf52dk/nrf52832
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- nrf52833dk/nrf52820
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- nrf52833dk/nrf52833
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- nrf52840dk/nrf52811
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- nrf52840dk/nrf52840
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- nrf5340dk/nrf5340/cpuapp
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- nrf5340dk/nrf5340/cpunet
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- nrf54h20dk/nrf54h20/cpuapp
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- nrf54h20dk/nrf54h20/cpurad
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- nrf54l15dk/nrf54l15/cpuapp
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- ophelia4ev/nrf54l15/cpuapp
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integration_platforms:
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- nrf52840dk/nrf52840
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- nrf5340dk/nrf5340/cpuapp
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- nrf5340dk/nrf5340/cpunet
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- nrf54h20dk/nrf54h20/cpuapp
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- nrf54h20dk/nrf54h20/cpurad
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- nrf54l15dk/nrf54l15/cpuapp
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- ophelia4ev/nrf54l15/cpuapp
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sample.boards.nordic.nrf_sys_event.force_constlat:
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platform_allow:
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- nrf52dk/nrf52810
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- nrf52dk/nrf52832
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- nrf52833dk/nrf52820
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- nrf52833dk/nrf52833
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- nrf52840dk/nrf52811
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- nrf52840dk/nrf52840
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- nrf5340dk/nrf5340/cpuapp
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- nrf5340dk/nrf5340/cpunet
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- nrf54h20dk/nrf54h20/cpuapp
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- nrf54h20dk/nrf54h20/cpurad
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- nrf54l15dk/nrf54l15/cpuapp
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- ophelia4ev/nrf54l15/cpuapp
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integration_platforms:
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- nrf52840dk/nrf52840
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- nrf5340dk/nrf5340/cpuapp
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- nrf5340dk/nrf5340/cpunet
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- nrf54h20dk/nrf54h20/cpuapp
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- nrf54h20dk/nrf54h20/cpurad
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- nrf54l15dk/nrf54l15/cpuapp
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- ophelia4ev/nrf54l15/cpuapp
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extra_configs:
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- CONFIG_SOC_NRF_FORCE_CONSTLAT=y
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sample.boards.nordic.nrf_sys_event.rramc_wakeup:
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extra_configs:
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- CONFIG_NRF_SYS_EVENT_IRQ_LATENCY=y
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- CONFIG_NRF_SYS_EVENT_GRTC_CHAN_CNT=0
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platform_allow:
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- nrf54l15dk/nrf54l15/cpuapp
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integration_platforms:
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- nrf54l15dk/nrf54l15/cpuapp
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sample.boards.nordic.nrf_sys_event.rramc_wakeup.ppi:
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extra_configs:
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- CONFIG_NRF_SYS_EVENT_IRQ_LATENCY=y
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platform_allow:
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- nrf54l15dk/nrf54l15/cpuapp
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- nrf54l15dk/nrf54l15/cpuflpr/xip
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integration_platforms:
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- nrf54l15dk/nrf54l15/cpuapp

‎samples/boards/nordic/nrf_sys_event/src/main.c‎

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*/
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#include <nrf_sys_event.h>
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#include <zephyr/drivers/counter.h>
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#include <zephyr/cache.h>
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#include <stdio.h>
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#ifdef CONFIG_NRF_SYS_EVENT_IRQ_LATENCY
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static void counter_handler(const struct device *counter_dev, uint8_t ch_id,
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uint32_t ticks, void *user_data)
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{
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k_sem_give((struct k_sem *)user_data);
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}
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static uint32_t counter_alarm_execute(const struct device *counter_dev,
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struct counter_alarm_cfg *alarm_cfg, k_timeout_t timeout)
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{
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struct k_sem sem;
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uint32_t now;
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int err;
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k_sem_init(&sem, 0, 1);
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alarm_cfg->user_data = &sem;
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now = k_cycle_get_32();
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err = counter_set_channel_alarm(counter_dev, 0, alarm_cfg);
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if (err < 0) {
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printf("Failed to set the counter alarm.\n");
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return 0;
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}
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err = k_sem_take(&sem, timeout);
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if (err < 0) {
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printf("Failed waiting for counter alarm.\n");
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return 0;
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}
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return k_cycle_get_32() - now;
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}
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static void sys_event_irq_latency(void)
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{
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const struct device *counter = DEVICE_DT_GET(DT_NODELABEL(sample_counter));
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struct counter_alarm_cfg alarm_cfg;
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uint32_t delay = 1000;
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uint32_t delay_adj = 8;
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uint32_t rpt = 100;
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uint32_t cyc;
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int event_handle;
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counter_start(counter);
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alarm_cfg.flags = 0;
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alarm_cfg.ticks = counter_us_to_ticks(counter, delay);
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alarm_cfg.callback = counter_handler;
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cyc = 0;
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for (int i = 0; i < rpt; i++) {
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sys_cache_instr_invd_all();
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cyc += counter_alarm_execute(counter, &alarm_cfg, K_USEC(delay + 100));
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}
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cyc /= rpt;
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printf("Alarm set for %d us, execution took:%d (no event registered)\n", delay, cyc);
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cyc = 0;
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for (int i = 0; i < rpt; i++) {
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sys_cache_instr_invd_all();
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/* Event is delayed because it is registered early and not as it should just
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* before starting. Triggering event too early may result in RRAMC going back
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* to sleep before actual event wakes up the CPU.
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*/
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event_handle = nrf_sys_event_register(delay + delay_adj, true);
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if (event_handle < 0) {
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printf("Failed to register an event:%d\n", event_handle);
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return;
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}
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cyc += counter_alarm_execute(counter, &alarm_cfg, K_USEC(delay + 100));
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(void)nrf_sys_event_unregister(event_handle, false);
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}
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cyc /= rpt;
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printf("Alarm set for %d us, execution took:%d\n", delay, cyc);
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}
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#endif /* CONFIG_NRF_SYS_EVENT_IRQ_LATENCY */
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int main(void)
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{
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printf("request global constant latency mode\n");
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}
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printf("constant latency mode disabled\n");
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#ifdef CONFIG_NRF_SYS_EVENT_IRQ_LATENCY
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sys_event_irq_latency();
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#endif
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return 0;
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}

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