rtc-clock

Set the SoC RTC, then read it back. The minimal demo for <alp/rtc.h>.

Source: examples/rtc-clock/.

board.yaml

schema_version: 2

som:
  sku: E1M-AEN701

carrier:
  name: E1M-EVK

cores:
  m55_hp:
    os: zephyr
    app: ./src
    peripherals: [rtc]

diagnostics:
  log_level: info

Source (abbreviated)

#include <alp/rtc.h>

int main(void) {
    alp_rtc_t *rtc = alp_rtc_open(&(alp_rtc_config_t){});
    if (rtc == NULL) return -1;

    alp_rtc_datetime_t dt = {
        .year = 2026, .month = 5, .day = 14,
        .hour = 12,   .minute = 0, .second = 0,
    };
    alp_rtc_set(rtc, &dt);

    for (int i = 0; i < 5; i++) {
        alp_rtc_datetime_t now;
        alp_rtc_get(rtc, &now);
        printk("[rtc] %04u-%02u-%02u %02u:%02u:%02u\n",
               now.year, now.month, now.day, now.hour, now.minute, now.second);
        k_msleep(1000);
    }
    alp_rtc_close(rtc);
    return 0;
}

On-module RTC (V2N)

V2N modules carry a battery-backed Micro Crystal RV-3028-C7 alongside the SoC RTC. For backup-domain persistence use <alp/chips/rv3028c7.h> directly. See v2n-rtc-multi-alarm.

See also

• <alp/rtc.h> reference
• Examples overview