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76 lines
2.8 KiB
Markdown
76 lines
2.8 KiB
Markdown
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| Supported Targets | ESP32 | ESP32-C3 | ESP32-S2 | ESP32-S3 |
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| ----------------- | ----- | -------- | -------- | -------- |
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# Deep Sleep Wake Stub Example
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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The [Deep-sleep wake stub](https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/deep-sleep-stub.html) is used to RTC fast boot mode that avoid the SPI flash booting, thus speeding up the wakeup process. This example demonstrates how to implement the wake stub.
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In this example, the `CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP` Kconfig option is used, which allows you to reduce the boot time of the bootloader during waking up from deep sleep. The bootloader stores in rtc memory the address of a running partition and uses it when it wakes up. This example allows you to skip all image checks and speed up the boot.
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## How to use example
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### Hardware Required
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This example should be able to run on any commonly available ESP32/ESP32-S2/ESP32-S3/ESP32-C3 development board without any extra hardware if only **Timer** wake up sources are used.
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### Configure the project
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```
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idf.py menuconfig
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```
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* **Wake up time** can be configured via `Example configuration > Wake up interval in seconds`
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Wake up sources that are unused or unconnected should be disabled in configuration to prevent inadvertent triggering of wake up as a result of floating pins.
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### Build and Flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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idf.py -p PORT flash monitor
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```
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(Replace PORT with the name of the serial port to use.)
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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On initial startup, this example will detect that this is the first boot and output the following log:
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```
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...
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I (309) cpu_start: Starting scheduler on PRO CPU.
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I (0) cpu_start: Starting scheduler on APP CPU.
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Not a deep sleep reset
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Enabling timer wakeup, 10s
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Entering deep sleep
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```
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The ESP chips will then enter deep sleep. When a timer wake up occurs, if deep sleep wake stub enabled, the ESP chips will boot from RTC memory and execute stub code. The output log such as the following:
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```
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...
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ESP-ROM:esp32s3-20210327
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Build:Mar 27 2021
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rst:0x5 (DSLEEP),boot:0x8 (SPI_FAST_FLASH_BOOT)
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wake stub: wakeup count is 1, wakeup cause is 8
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wake stub: going to deep sleep
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ESP-ROM:esp32s3-20210327
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Build:Mar 27 2021
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rst:0x5 (DSLEEP),boot:0x8 (SPI_FAST_FLASH_BOOT)
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wake stub: wakeup count is 2, wakeup cause is 8
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wake stub: going to deep sleep
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ESP-ROM:esp32s3-20210327
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Build:Mar 27 2021
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rst:0x5 (DSLEEP),boot:0x8 (SPI_FAST_FLASH_BOOT)
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wake stub: wakeup count is 3, wakeup cause is 8
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wake stub: going to deep sleep
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```
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