7c494055e3
App can contain a stub program resident in RTC fast memory. Bootloader
will load the stub on initial boot. If the device wakes from deep sleep,
the stub is run immediately (before any other data is loaded, etc.)
To implement a custom wake stub, implement a function in your program:
```
void RTC_IRAM_ATTR esp_wake_deep_sleep(void)
{
esp_default_wake_deep_sleep();
// other wake logic
}
```
... and it will replace the default implementation.
137 lines
4.1 KiB
C
137 lines
4.1 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef __ESP_DEEPSLEEP_H__
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#define __ESP_DEEPSLEEP_H_
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** \defgroup Deep_Sleep_API Deep Sleep API
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* @brief API for putting device into deep sleep
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*/
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/** @addtogroup Deep_Sleep_API
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* @{
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*/
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/**
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* @brief Set the chip to deep-sleep mode.
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*
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* The device will automatically wake up after the deep-sleep time set
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* by the users. Upon waking up, the device boots up from user_init.
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*
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* @attention The parameter time_in_us to be "uint64" is for further development.
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* Only the low 32 bits of parameter time_in_us are avalable now.
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*
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* @param uint64 time_in_us : deep-sleep time, only the low 32bits are avalable now. unit: microsecond
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*
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* @return null
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*/
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void system_deep_sleep(uint64_t time_in_us);
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/**
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* @brief Default stub to run on wake from deep sleep.
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*
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* Allows for executing code immediately on wake from sleep, before
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* the software bootloader or esp-idf app has started up.
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*
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* This function is weak-linked, so you can implement your own version
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* to run code immediately when the chip wakes from
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* sleep.
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*
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* For example:
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* @code
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* void RTC_IRAM_ATTR esp_wake_deep_sleep(void) {
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* esp_default_wake_deep_sleep();
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* // Add additional functionality here
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* }
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*
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* (Implementing this function is not required for normal operation,
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* in the usual case your app will start normally when waking from
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* deep sleep.)
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*
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* esp_wake_deep_sleep() functionality is limited:
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*
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* - Runs immediately on wake, so most of the SoC is freshly reset -
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* flash is unmapped and hardware is otherwise uninitialised.
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*
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* - Can only call functions implemented in ROM, or marked RTC_IRAM_ATTR.
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*
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* - Static variables marked RTC_DATA_ATTR will have initial values on
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* cold boot, and maintain these values between sleep/wake cycles.
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*
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* - Read-only data should be marked RTC_RODATA_ATTR. Strings must be
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* declared as variables also using RTC_RODATA_ATTR, like this:
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* RTC_RODATA_ATTR const char message[] = "Hello from very early boot!\n";
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*
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* - Any other static memory will not be initialised (either to zero,
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* or to any predefined value).
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*
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*
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* - If you implement your own stub, the first call the stub makes
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should be to esp_default_wake_deep_sleep().
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*/
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void esp_wake_deep_sleep(void);
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/**
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* @brief Function type for stub to run on wake from sleep.
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*
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*/
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typedef void (*esp_deep_sleep_wake_stub_fn_t)(void);
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/**
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* @brief Install a new stub at runtime to run on wake from deep sleep
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*
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* If implementing esp_wake_deep_sleep() then it is not necessary to
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* call this function.
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*
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* However, it is possible to call this function to substitute a
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* different deep sleep stub. Any function used as a deep sleep stub
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* must be marked RTC_IRAM_ATTR, and must obey the same rules given
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* for esp_wake_deep_sleep().
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*/
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void esp_set_deep_sleep_wake_stub(esp_deep_sleep_wake_stub_fn_t new_stub);
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/**
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* @brief Return current wake from deep sleep stub, or NULL if
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* no stub is installed.
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*/
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esp_deep_sleep_wake_stub_fn_t esp_get_deep_sleep_wake_stub(void);
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/* The default esp-idf-provided esp_wake_deep_sleep() stub.
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If you replace esp_wake_deep_sleep() in your program, or use
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esp_set_deep_sleep_wake_stub(), then it is recommended you call
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esp_default_wake_deep_sleep() as the first function in your stub.
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*/
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void esp_default_wake_deep_sleep(void);
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/**
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* @}
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*/
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/**
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ESP_SYSTEM_H__ */
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