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doc: update deep_sleep_wake_stub readme

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wuzhenghui 2023-03-10 13:43:58 +08:00
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examples/system/deep_sleep_wake_stub/README.md
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@ -13,7 +13,7 @@ In this example, the `CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP` Kconfig opt
### Hardware Required
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.
This example should be able to run on any commonly available ESP32/ESP32-S2/ESP32-S3/ESP32-C3/ESP32-C6 development board without any extra hardware if only **Timer** wake up sources are used.
### Configure the project
@ -57,19 +57,28 @@ The ESP chips will then enter deep sleep. When a timer wake up occurs, if deep s
```
...
ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x5 (DSLEEP),boot:0x8 (SPI_FAST_FLASH_BOOT)
wake stub: wakeup count is 1, wakeup cause is 8
ESP-ROM:esp32c6-20220919
Build:Sep 19 2022
rst:0x5 (SLEEP_WAKEUP),boot:0x2c (SPI_FAST_FLASH_BOOT)
wake stub: wakeup count is 1, wakeup cause is 16, wakeup cost 6505 us
wake stub: going to deep sleep
ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x5 (DSLEEP),boot:0x8 (SPI_FAST_FLASH_BOOT)
wake stub: wakeup count is 2, wakeup cause is 8
ESP-ROM:esp32c6-20220919
Build:Sep 19 2022
rst:0x5 (SLEEP_WAKEUP),boot:0x2c (SPI_FAST_FLASH_BOOT)
wake stub: wakeup count is 2, wakeup cause is 16, wakeup cost 6506 us
wake stub: going to deep sleep
ESP-ROM:esp32s3-20210327
Build:Mar 27 2021
rst:0x5 (DSLEEP),boot:0x8 (SPI_FAST_FLASH_BOOT)
wake stub: wakeup count is 3, wakeup cause is 8
ESP-ROM:esp32c6-20220919
Build:Sep 19 2022
rst:0x5 (SLEEP_WAKEUP),boot:0x2c (SPI_FAST_FLASH_BOOT)
wake stub: wakeup count is 3, wakeup cause is 16, wakeup cost 6505 us
wake stub: going to deep sleep
```
> Note:
> 1. The wakeup time cost printed in this example is not accurate, it does not take into account the hardware initialization time before the CPU starts, for most esp chips the initialization time cost is about 280us.
> 2. And the wake-up time shown in this example is not the optimal wake-up time, because the ROM printing before the wake stub occupies most of the wake-up time, for most esp chips this ROM printing takes about 6100us. In the product firmware, users can temporarily or permanently turn off ROM printing via call `esp_deep_sleep_disable_rom_logging` or set `menuconfig->Boot ROM Behavior->Permanently disable logging` to speed up the wake-up time.
> 3. A method for roughly estimating optimal wake-up time: Taking esp32c6 as example, the wake-up time from stub printing is about 6500us, minus the ROM printing overhead of 6100us, plus the system initialization overhead of 280us, its optimal wake-up overhead is about 680us. Users also can modify the example to configure GPIO wake-up, and obtain a more realistic and accurate wake-up time by grabbing GPIO signals