esp-idf/components/esp_timer/src/system_time.c

/*
 * SPDX-FileCopyrightText: 2017-2022 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */

// Provides strong definition for system time functions relied upon
// by core components.
#include "sdkconfig.h"

#if CONFIG_ESP_TIME_FUNCS_USE_ESP_TIMER
#include "esp_timer.h"
#include "esp_timer_impl.h"
#include "esp_system.h"
#include "esp_newlib.h"
#include "esp_log.h"

#include "esp_private/startup_internal.h"

#if CONFIG_IDF_TARGET_ESP32
#include "esp32/rtc.h"
#elif CONFIG_IDF_TARGET_ESP32S2
#include "esp32s2/rtc.h"
#elif CONFIG_IDF_TARGET_ESP32S3
#include "esp32s3/rtc.h"
#elif CONFIG_IDF_TARGET_ESP32C3
#include "esp32c3/rtc.h"
#elif CONFIG_IDF_TARGET_ESP32C2
#include "esp32c2/rtc.h"
#elif CONFIG_IDF_TARGET_ESP32C6
#include "esp32c6/rtc.h"
#elif CONFIG_IDF_TARGET_ESP32H2
#include "esp32h2/rtc.h"
#elif CONFIG_IDF_TARGET_ESP32P4
#include "esp32p4/rtc.h"
#endif

__attribute__((unused)) static const char* TAG = "system_time";

// Correction for underlying timer to keep definition
// of system time consistent.
static int64_t s_correction_us = 0;

void esp_timer_impl_init_system_time(void)
{
    s_correction_us = esp_rtc_get_time_us() - g_startup_time - esp_timer_impl_get_time();
#if defined(CONFIG_ESP_TIME_FUNCS_USE_ESP_TIMER) && defined(CONFIG_ESP_TIME_FUNCS_USE_RTC_TIMER)
    esp_err_t err = esp_register_shutdown_handler(esp_sync_timekeeping_timers);
    if (err != ESP_OK) {
        ESP_LOGW(TAG, "Register shutdown handler failed, err = 0x%x", err);
    }
#endif
}

int64_t IRAM_ATTR esp_system_get_time(void)
{
    return esp_timer_get_time() + s_correction_us;
}

uint32_t IRAM_ATTR esp_system_get_time_resolution(void)
{
    return 1000;
}
#endif