警告

This document is not updated for ESP32C5 yet, so some of the content may not be correct.

This warning was automatically inserted due to the source file being in the add_warnings_pages list.

睡眠模式

概述

ESP32-C5 具有 Light-sleep 和 Deep-sleep 两种睡眠节能模式。根据应用所使用的功能，还有一些细分的子睡眠模式。关于这些睡眠模式和其子模式，参见睡眠节能模式。另外，还可以配置一些断电选项来进一步减少功耗，请参见断电选项。

睡眠模式有多种唤醒源。这些唤醒源也可以组合在一起，此时任何一个唤醒源都可以触发唤醒。唤醒源详细描述了这些唤醒源，以及配置 API。

断电选项和唤醒源的配置不是必要的，并且可以在进入睡眠模式前的任意时候进行。

最后，应用通过调用开始睡眠的 API 来使芯片进入其中一种睡眠模式，更多详情请参见进入睡眠模式。当唤醒条件满足，芯片就会从睡眠中被唤醒。关于如何获取唤醒原因，请参见检查睡眠唤醒原因。关于醒来后如何处理唤醒源，请参见禁用睡眠模式唤醒源。

睡眠节能模式

在 Light-sleep 模式下，数字外设、CPU、以及大部分 RAM 都使用时钟门控，同时其供电电压降低。退出该模式后，数字外设、CPU 和 RAM 恢复运行，并且内部状态将被保留。

在 Deep-sleep 模式下，CPU、大部分 RAM、以及所有由时钟 APB_CLK 驱动的数字外设都会被断电。芯片上继续处于供电状态的部分仅包括：

RTC 控制器

RTC 高速内存

唤醒源

通过 API esp_sleep_enable_X_wakeup 可启用唤醒源。唤醒源在芯片被唤醒后并不会被禁用，若你不再需要某些唤醒源，可通过 API esp_sleep_disable_wakeup_source() 将其禁用，详见禁用睡眠模式唤醒源。

以下是 ESP32-C5 所支持的唤醒源。

定时器

RTC 控制器中内嵌定时器，可用于在预定义的时间到达后唤醒芯片。时间精度为微秒，但其实际分辨率依赖于为 RTC_SLOW_CLK 所选择的时钟源。

在这种唤醒模式下，无需为睡眠模式中的 RTC 外设或内存供电。

调用 esp_sleep_enable_timer_wakeup() 函数可启用使用定时器唤醒睡眠模式。

GPIO 唤醒

任何一个 IO 都可以用作外部输入管脚，将芯片从 Light-sleep 状态唤醒。调用 gpio_wakeup_enable() 函数可以将任意管脚单独配置为在高电平或低电平触发唤醒。此后，应调用 esp_sleep_enable_gpio_wakeup() 函数来启用此唤醒源。

此外，可将由 VDD3P3_RTC 电源域供电的 IO 用于芯片的 Deep-sleep 唤醒。调用 esp_deep_sleep_enable_gpio_wakeup() 函数可以配置相应的唤醒管脚和唤醒触发电平，该函数用于启用相应管脚的 Deep-sleep 唤醒功能。

备注

UART 唤醒（仅适用于 Light-sleep 模式）

当 ESP32-C5 从外部设备接收 UART 输入时，通常需要在输入数据可用时唤醒芯片。UART 外设支持在 RX 管脚上观测到一定数量的上升沿时，将芯片从 Light-sleep 模式中唤醒。调用 uart_set_wakeup_threshold() 函数可设置被观测上升沿的数量。请注意，触发唤醒的字符（及该字符前的所有字符）在唤醒后不会被 UART 接收，因此在发送数据之前，外部设备通常需要首先向 ESP32-C5 额外发送一个字符以触发唤醒。

可调用 esp_sleep_enable_uart_wakeup() 函数来启用此唤醒源。

使用 UART 唤醒之后，在芯片 Active 模式下需要让 UART 接受一些数据用来清零内部的唤醒指示信号。不然的话，下一次 UART 唤醒的触发将只需要比配置的阈值少两个上升沿的数量。

禁用睡眠模式唤醒源

调用 API esp_sleep_disable_wakeup_source() 可以禁用给定唤醒源的触发器，从而禁用该唤醒源。此外，如果将参数设置为 ESP_SLEEP_WAKEUP_ALL，该函数可用于禁用所有触发器。

断电选项

应用程序可以使用 API esp_sleep_pd_config() 强制 RTC 外设和 RTC 内存进入特定断电模式。在 Deep-sleep 模式下，你还可以通过隔离一些 IO 来进一步降低功耗。

RTC 外设和内存断电

默认情况下，调用函数 esp_deep_sleep_start() 和 esp_light_sleep_start() 后，所有唤醒源不需要的 RTC 电源域都会被断电。可调用函数 esp_sleep_pd_config() 来修改这一设置。

ESP32-C5 中只有 RTC 高速内存，因此，如果程序中的某些值被标记为 RTC_DATA_ATTR、RTC_SLOW_ATTR 或 RTC_FAST_ATTR 属性，那么所有这些值都将被存入 RTC 高速内存，默认情况下保持供电。如有需要，也可以使用函数 esp_sleep_pd_config() 对其进行修改。

flash 断电

默认情况下，调用函数 esp_light_sleep_start() 后，flash 不会断电，因为在 sleep 过程中断电 flash 存在风险。具体而言，flash 断电需要时间，但是在此期间，系统有可能被唤醒，导致 flash 重新被上电。此时，断电尚未完成又重新上电的硬件行为有可能导致 flash 无法正常工作。

理论上讲，在 flash 完全断电后可以仅唤醒系统，然而现实情况是 flash 断电所需的时间很难预测。如果用户为 flash 供电电路添加了滤波电容，断电所需时间可能会更长。此外，即使可以预知 flash 彻底断电所需的时间，有时也不能通过设置足够长的睡眠时间来确保 flash 断电的安全（比如，突发的异步唤醒源会使得实际的睡眠时间不可控）。

警告

如果在 flash 的供电电路上添加了滤波电容，那么应当尽一切可能避免 flash 断电。

因为这些不可控的因素，ESP-IDF 很难保证 flash 断电的绝对安全。因此 ESP-IDF 不推荐用户断电 flash。对于一些功耗敏感型应用，可以通过设置 Kconfig 配置项 CONFIG_ESP_SLEEP_FLASH_LEAKAGE_WORKAROUND 来减少 Light-sleep 期间 flash 的功耗。这种方式在几乎所有场景下都要比断电 flash 更好，兼顾了安全性和功耗。

考虑到有些用户能够充分评估断电 flash 的风险，并希望通过断电 flash 来获得更低的功耗，因此 ESP-IDF 提供了两种断电 flash 的机制：

设置 Kconfig 配置项 CONFIG_ESP_SLEEP_POWER_DOWN_FLASH 将使 ESP-IDF 以一个严格的条件来断电 flash。严格的条件具体指的是，RTC timer 是唯一的唤醒源且睡眠时间比 flash 彻底断电所需时间更长。

调用函数 esp_sleep_pd_config(ESP_PD_DOMAIN_VDDSDIO, ESP_PD_OPTION_OFF) 将使 ESP-IDF 以一个宽松的条件来断电 flash。宽松的条件具体指的是 RTC timer 唤醒源未被使能或睡眠时间比 flash 彻底断电所需时间更长。

备注

Light-sleep 模式下，ESP-IDF 没有提供保证 flash 一定会被断电的机制。
不管用户的配置如何，函数 esp_deep_sleep_start() 都会强制断电 flash。

配置 IO（仅适用于 Deep-sleep）

一些 ESP32-C5 IO 在默认情况下启用内部上拉或下拉电阻。如果这些管脚在 Deep-sleep 模式下中受外部电路驱动，电流流经这些上下拉电阻时，可能会增加电流消耗。

进入睡眠模式

应用程序通过 API esp_light_sleep_start() 或 esp_deep_sleep_start() 进入 Light-sleep 或 Deep-sleep 模式。此时，系统将按照被请求的唤醒源和断电选项配置有关的 RTC 控制器参数。

允许在未配置唤醒源的情况下进入睡眠模式。在此情况下，芯片将一直处于睡眠模式，直到从外部被复位。

UART 输出处理

在进入睡眠模式之前，调用函数 esp_deep_sleep_start() 会冲刷掉 UART FIFO 缓存。

当使用函数 esp_light_sleep_start() 进入 Light-sleep 模式时，UART FIFO 将不会被冲刷。与之相反，UART 输出将被暂停，FIFO 中的剩余字符将在 Light-sleep 唤醒后被发送。

检查睡眠唤醒原因

esp_sleep_get_wakeup_cause() 函数可用于检测是何种唤醒源在睡眠期间被触发。

应用程序示例

protocols/sntp 演示如何实现 Deep-sleep 模式的基本功能，周期性唤醒 ESP 模块，以从 NTP 服务器获取时间。
system/deep_sleep 演示如何通过 ESP32-C5 的唤醒源，如 RTC 定时器, GPIO, EXT0, EXT1, 触摸传感器等，触发 Deep-sleep 唤醒。
system/light_sleep 演示如何使用 ESP32-C5 的唤醒源，如定时器，GPIO，触摸传感器等，触发 Light-sleep 唤醒。

API 参考

Header File

components/esp_hw_support/include/esp_sleep.h
This header file can be included with:
#include "esp_sleep.h"

Functions

esp_err_t esp_sleep_disable_wakeup_source(esp_sleep_source_t source)

Disable wakeup source.

This function is used to deactivate wake up trigger for source defined as parameter of the function.

See docs/sleep-modes.rst for details.

备注

This function does not modify wake up configuration in RTC. It will be performed in esp_deep_sleep_start/esp_light_sleep_start function.

参数

source -- - number of source to disable of type esp_sleep_source_t

返回

ESP_OK on success
ESP_ERR_INVALID_STATE if trigger was not active

esp_err_t esp_sleep_enable_timer_wakeup(uint64_t time_in_us)

Enable wakeup by timer.

参数

time_in_us -- time before wakeup, in microseconds

返回

ESP_OK on success
ESP_ERR_INVALID_ARG if value is out of range (TBD)

bool esp_sleep_is_valid_wakeup_gpio(gpio_num_t gpio_num)

Returns true if a GPIO number is valid for use as wakeup source.

备注

For SoCs with RTC IO capability, this can be any valid RTC IO input pin.

参数: gpio_num -- Number of the GPIO to test for wakeup source capability
返回: True if this GPIO number will be accepted as a sleep wakeup source.

esp_err_t esp_sleep_enable_gpio_wakeup(void)

Enable wakeup from light sleep using GPIOs.

Each GPIO supports wakeup function, which can be triggered on either low level or high level. Unlike EXT0 and EXT1 wakeup sources, this method can be used both for all IOs: RTC IOs and digital IOs. It can only be used to wakeup from light sleep though.

To enable wakeup, first call gpio_wakeup_enable, specifying gpio number and wakeup level, for each GPIO which is used for wakeup. Then call this function to enable wakeup feature.

备注

On ESP32, GPIO wakeup source can not be used together with touch or ULP wakeup sources.

返回

ESP_OK on success
ESP_ERR_INVALID_STATE if wakeup triggers conflict

esp_err_t esp_sleep_enable_uart_wakeup(int uart_num)

Enable wakeup from light sleep using UART.

Use uart_set_wakeup_threshold function to configure UART wakeup threshold.

Wakeup from light sleep takes some time, so not every character sent to the UART can be received by the application.

备注

ESP32 does not support wakeup from UART2.

参数

uart_num -- UART port to wake up from

返回

ESP_OK on success
ESP_ERR_INVALID_ARG if wakeup from given UART is not supported

esp_err_t esp_sleep_enable_bt_wakeup(void)

Enable wakeup by bluetooth.

返回

ESP_OK on success
ESP_ERR_NOT_SUPPORTED if wakeup from bluetooth is not supported

esp_err_t esp_sleep_disable_bt_wakeup(void)

Disable wakeup by bluetooth.

返回

ESP_OK on success
ESP_ERR_NOT_SUPPORTED if wakeup from bluetooth is not supported

esp_err_t esp_sleep_enable_wifi_wakeup(void)

Enable wakeup by WiFi MAC.

返回

ESP_OK on success

esp_err_t esp_sleep_disable_wifi_wakeup(void)

Disable wakeup by WiFi MAC.

返回

ESP_OK on success

esp_err_t esp_sleep_enable_wifi_beacon_wakeup(void)

Enable beacon wakeup by WiFi MAC, it will wake up the system into modem state.

返回

ESP_OK on success

esp_err_t esp_sleep_disable_wifi_beacon_wakeup(void)

Disable beacon wakeup by WiFi MAC.

返回

ESP_OK on success

uint64_t esp_sleep_get_ext1_wakeup_status(void)

Get the bit mask of GPIOs which caused wakeup (ext1)

If wakeup was caused by another source, this function will return 0.

返回: bit mask, if GPIOn caused wakeup, BIT(n) will be set

esp_err_t esp_sleep_pd_config(esp_sleep_pd_domain_t domain, esp_sleep_pd_option_t option)

Set power down mode for an RTC power domain in sleep mode.

If not set set using this API, all power domains default to ESP_PD_OPTION_AUTO.

参数

domain -- power domain to configure
option -- power down option (ESP_PD_OPTION_OFF, ESP_PD_OPTION_ON, or ESP_PD_OPTION_AUTO)

返回

ESP_OK on success
ESP_ERR_INVALID_ARG if either of the arguments is out of range

esp_err_t esp_deep_sleep_try_to_start(void)

Enter deep sleep with the configured wakeup options.

The reason for the rejection can be such as a short sleep time.

备注

In general, the function does not return, but if the sleep is rejected, then it returns from it.

返回

No return - If the sleep is not rejected.
ESP_ERR_SLEEP_REJECT sleep request is rejected(wakeup source set before the sleep request)

void esp_deep_sleep_start(void): Enter deep sleep with the configured wakeup options.

备注

The function does not do a return (no rejection). Even if wakeup source set before the sleep request it goes to deep sleep anyway.

esp_err_t esp_light_sleep_start(void)

Enter light sleep with the configured wakeup options.

返回

ESP_OK on success (returned after wakeup)
ESP_ERR_SLEEP_REJECT sleep request is rejected(wakeup source set before the sleep request)
ESP_ERR_SLEEP_TOO_SHORT_SLEEP_DURATION after deducting the sleep flow overhead, the final sleep duration is too short to cover the minimum sleep duration of the chip, when rtc timer wakeup source enabled

esp_err_t esp_deep_sleep_try(uint64_t time_in_us)

Enter deep-sleep mode.

The device will automatically wake up after the deep-sleep time Upon waking up, the device calls deep sleep wake stub, and then proceeds to load application.

Call to this function is equivalent to a call to esp_deep_sleep_enable_timer_wakeup followed by a call to esp_deep_sleep_start.

The reason for the rejection can be such as a short sleep time.

备注

In general, the function does not return, but if the sleep is rejected, then it returns from it.

参数

time_in_us -- deep-sleep time, unit: microsecond

返回

No return - If the sleep is not rejected.
ESP_ERR_SLEEP_REJECT sleep request is rejected(wakeup source set before the sleep request)

void esp_deep_sleep(uint64_t time_in_us)

Enter deep-sleep mode.

The device will automatically wake up after the deep-sleep time Upon waking up, the device calls deep sleep wake stub, and then proceeds to load application.

Call to this function is equivalent to a call to esp_deep_sleep_enable_timer_wakeup followed by a call to esp_deep_sleep_start.

备注

The function does not do a return (no rejection).. Even if wakeup source set before the sleep request it goes to deep sleep anyway.

参数: time_in_us -- deep-sleep time, unit: microsecond

esp_err_t esp_deep_sleep_register_hook(esp_deep_sleep_cb_t new_dslp_cb)

Register a callback to be called from the deep sleep prepare.

警告

deepsleep callbacks should without parameters, and MUST NOT, UNDER ANY CIRCUMSTANCES, CALL A FUNCTION THAT MIGHT BLOCK.

参数

new_dslp_cb -- Callback to be called

返回

ESP_OK: Callback registered to the deepsleep misc_modules_sleep_prepare
ESP_ERR_NO_MEM: No more hook space for register the callback

void esp_deep_sleep_deregister_hook(esp_deep_sleep_cb_t old_dslp_cb)

Unregister an deepsleep callback.

参数: old_dslp_cb -- Callback to be unregistered

esp_sleep_wakeup_cause_t esp_sleep_get_wakeup_cause(void)

Get the wakeup source which caused wakeup from sleep.

返回: cause of wake up from last sleep (deep sleep or light sleep)

void esp_wake_deep_sleep(void)

Default stub to run on wake from deep sleep.

Allows for executing code immediately on wake from sleep, before the software bootloader or ESP-IDF app has started up.

This function is weak-linked, so you can implement your own version to run code immediately when the chip wakes from sleep.

See docs/deep-sleep-stub.rst for details.

void esp_set_deep_sleep_wake_stub(esp_deep_sleep_wake_stub_fn_t new_stub)

Install a new stub at runtime to run on wake from deep sleep.

If implementing esp_wake_deep_sleep() then it is not necessary to call this function.

However, it is possible to call this function to substitute a different deep sleep stub. Any function used as a deep sleep stub must be marked RTC_IRAM_ATTR, and must obey the same rules given for esp_wake_deep_sleep().

void esp_set_deep_sleep_wake_stub_default_entry(void): Set wake stub entry to default esp_wake_stub_entry

esp_deep_sleep_wake_stub_fn_t esp_get_deep_sleep_wake_stub(void)

Get current wake from deep sleep stub.

返回: Return current wake from deep sleep stub, or NULL if no stub is installed.

void esp_default_wake_deep_sleep(void)

The default esp-idf-provided esp_wake_deep_sleep() stub.

See docs/deep-sleep-stub.rst for details.

void esp_deep_sleep_disable_rom_logging(void)

Disable logging from the ROM code after deep sleep.

Using LSB of RTC_STORE4.

void esp_sleep_config_gpio_isolate(void): Configure to isolate all GPIO pins in sleep state.

void esp_sleep_enable_gpio_switch(bool enable)

Enable or disable GPIO pins status switching between slept status and waked status.

参数: enable -- decide whether to switch status or not

Macros

ESP_PD_DOMAIN_RTC8M

ESP_SLEEP_POWER_DOWN_CPU

Type Definitions

typedef void (*esp_deep_sleep_cb_t)(void)

typedef esp_sleep_source_t esp_sleep_wakeup_cause_t

typedef void (*esp_deep_sleep_wake_stub_fn_t)(void): Function type for stub to run on wake from sleep.

Enumerations

enum esp_sleep_pd_domain_t

Logic function used for EXT1 wakeup mode.

Power domains which can be powered down in sleep mode

Values:

enumerator ESP_PD_DOMAIN_RTC_PERIPH: RTC IO, sensors and ULP co-processor.

enumerator ESP_PD_DOMAIN_XTAL: XTAL oscillator.

enumerator ESP_PD_DOMAIN_XTAL32K: External 32 kHz XTAL oscillator.

enumerator ESP_PD_DOMAIN_RC32K: Internal 32 kHz RC oscillator.

enumerator ESP_PD_DOMAIN_RC_FAST: Internal Fast oscillator.

enumerator ESP_PD_DOMAIN_VDDSDIO: VDD_SDIO.

enumerator ESP_PD_DOMAIN_MODEM: MODEM, includes WiFi, Bluetooth and IEEE802.15.4.

enumerator ESP_PD_DOMAIN_TOP: SoC TOP.

enumerator ESP_PD_DOMAIN_MAX: Number of domains.

enum esp_sleep_pd_option_t

Power down options.

Values:

enumerator ESP_PD_OPTION_OFF: Power down the power domain in sleep mode.

enumerator ESP_PD_OPTION_ON: Keep power domain enabled during sleep mode.

enumerator ESP_PD_OPTION_AUTO: Keep power domain enabled in sleep mode, if it is needed by one of the wakeup options. Otherwise power it down.

enum esp_sleep_source_t

Sleep wakeup cause.

Values:

enumerator ESP_SLEEP_WAKEUP_UNDEFINED: In case of deep sleep, reset was not caused by exit from deep sleep.

enumerator ESP_SLEEP_WAKEUP_ALL: Not a wakeup cause, used to disable all wakeup sources with esp_sleep_disable_wakeup_source.

enumerator ESP_SLEEP_WAKEUP_EXT0: Wakeup caused by external signal using RTC_IO.

enumerator ESP_SLEEP_WAKEUP_EXT1: Wakeup caused by external signal using RTC_CNTL.

enumerator ESP_SLEEP_WAKEUP_TIMER: Wakeup caused by timer.

enumerator ESP_SLEEP_WAKEUP_TOUCHPAD: Wakeup caused by touchpad.

enumerator ESP_SLEEP_WAKEUP_ULP: Wakeup caused by ULP program.

enumerator ESP_SLEEP_WAKEUP_GPIO: Wakeup caused by GPIO (light sleep only on ESP32, S2 and S3)

enumerator ESP_SLEEP_WAKEUP_UART: Wakeup caused by UART (light sleep only)

enumerator ESP_SLEEP_WAKEUP_WIFI: Wakeup caused by WIFI (light sleep only)

enumerator ESP_SLEEP_WAKEUP_COCPU: Wakeup caused by COCPU int.

enumerator ESP_SLEEP_WAKEUP_COCPU_TRAP_TRIG: Wakeup caused by COCPU crash.

enumerator ESP_SLEEP_WAKEUP_BT: Wakeup caused by BT (light sleep only)

enum esp_sleep_mode_t

Sleep mode.

Values:

enumerator ESP_SLEEP_MODE_LIGHT_SLEEP: light sleep mode

enumerator ESP_SLEEP_MODE_DEEP_SLEEP: deep sleep mode

enum [anonymous]

Values:

enumerator ESP_ERR_SLEEP_REJECT

enumerator ESP_ERR_SLEEP_TOO_SHORT_SLEEP_DURATION

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