esp-idf/components/esp_system/system_time.c

/*
 * SPDX-FileCopyrightText: 2020-2022 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include "esp_system.h"
#include "esp_attr.h"

#include "soc/rtc.h"

#include "freertos/FreeRTOS.h"

#include "sdkconfig.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_ESP32H2
#include "esp32h2/rtc.h"
#elif CONFIG_IDF_TARGET_ESP32C2
#include "esp32c2/rtc.h"
#endif

#include "esp_private/startup_internal.h"

// A component in the build should provide strong implementations that make use of
// and actual hardware timer to provide timekeeping functions.
int64_t IRAM_ATTR __attribute__((weak)) esp_system_get_time(void)
{
    int64_t t = 0;
    t = (esp_rtc_get_time_us() - g_startup_time);
    return t;
}

uint32_t IRAM_ATTR __attribute__((weak)) esp_system_get_time_resolution(void)
{
    return 1000000000L / rtc_clk_slow_freq_get_hz();
}