1 /*
2  * SPDX-FileCopyrightText: 2017-2022 Espressif Systems (Shanghai) CO LTD
3  *
4  * SPDX-License-Identifier: Apache-2.0
5  */
6 
7 // Provides strong definition for system time functions relied upon
8 // by core components.
9 #include "sdkconfig.h"
10 
11 #if CONFIG_ESP_TIME_FUNCS_USE_ESP_TIMER
12 #include "esp_timer.h"
13 #include "esp_timer_impl.h"
14 #include "esp_system.h"
15 #include "esp_log.h"
16 
17 #include "esp_private/startup_internal.h"
18 
19 #if CONFIG_IDF_TARGET_ESP32
20 #include "esp32/rtc.h"
21 #elif CONFIG_IDF_TARGET_ESP32S2
22 #include "esp32s2/rtc.h"
23 #elif CONFIG_IDF_TARGET_ESP32S3
24 #include "esp32s3/rtc.h"
25 #elif CONFIG_IDF_TARGET_ESP32C3
26 #include "esp32c3/rtc.h"
27 #elif CONFIG_IDF_TARGET_ESP32C2
28 #include "esp32c2/rtc.h"
29 #elif CONFIG_IDF_TARGET_ESP32C6
30 #include "esp32c6/rtc.h"
31 #elif CONFIG_IDF_TARGET_ESP32H2
32 #include "esp32h2/rtc.h"
33 #endif
34 
35 __attribute__((unused)) static const char* TAG = "system_time";
36 
37 // Correction for underlying timer to keep definition
38 // of system time consistent.
39 static int64_t s_correction_us = 0;
40 
esp_timer_impl_init_system_time(void)41 void esp_timer_impl_init_system_time(void)
42 {
43     s_correction_us = esp_rtc_get_time_us() - g_startup_time - esp_timer_impl_get_time();
44 #if defined(CONFIG_ESP_TIME_FUNCS_USE_ESP_TIMER) && defined(CONFIG_ESP_TIME_FUNCS_USE_RTC_TIMER)
45     esp_err_t err = esp_register_shutdown_handler(esp_sync_timekeeping_timers);
46     if (err != ESP_OK) {
47         ESP_LOGW(TAG, "Register shutdown handler failed, err = 0x%x", err);
48     }
49 #endif
50 }
51 
esp_system_get_time(void)52 int64_t IRAM_ATTR esp_system_get_time(void)
53 {
54     return esp_timer_get_time() + s_correction_us;
55 }
56 
esp_system_get_time_resolution(void)57 uint32_t IRAM_ATTR esp_system_get_time_resolution(void)
58 {
59     return 1000;
60 }
61 #endif
62