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113 lines
4.6 KiB
Markdown
113 lines
4.6 KiB
Markdown
| Supported Targets | ESP32 | ESP32-C3 | ESP32-S3 |
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| ----------------- | ----- | -------- | -------- |
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Bluetooth Power Save Example
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=================================
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This example is based on the [bleprph](../bleprph) example to show how to use the bluetooth power save mode.
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If the modem sleep mode is enabled, bluetooth will switch periodically between active and sleep.
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In sleep state, RF, PHY and BB are turned off in order to reduce power consumption.
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This example contains five build configurations. For each configuration, a few configuration options are set:
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- `sdkconfig.defaults.esp32`: ESP32 uses 32kHz XTAL as low power clock in light sleep enabled.
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- `sdkconfig.40m.esp32c3`: ESP32C3 uses 32kHz XTAL as low power clock in light sleep enabled.
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- `sdkconfig.esp32c3_40m`: ESP32C3 uses main XTAL as low power clock in light sleep enabled.
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- `sdkconfig.defaults.esp32s3`: ESP32S3 uses 32kHz XTAL as low power clock in light sleep enabled.
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- `sdkconfig.40m.esp32s3`: ESP32S3 uses main XTAL as low power clock in light sleep enabled.
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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-C3/ESP32-S3 development board.
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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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1. Configure RTC clock source:
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- `Component config > Hardware Settings > RTC Clock Config > RTC clock source`
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2. Enable power management:
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- `Component config > Power Management > [*] Support for power management`
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3. Configure FreeRTOS:
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- `Component config > FreeRTOS > Kernel`
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- `(1000) configTICK_RATE_HZ`
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- `[*] configUSE_TICKLESS_IDLE`
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- `(3) configEXPECTED_IDLE_TIME_BEFORE_SLEEP`
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4. Enable power down MAC and baseband:
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- `Component config > PHY > [*] Power down MAC and baseband of Wi-Fi and Bluetooth when PHY is disabled`
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5. Enable bluetooth modem sleep:
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- `Component config > Bluetooth > Controller Options > MODEM SLEEP Options`
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- `[*] Bluetooth modem sleep`
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- `[*] Bluetooth Modem sleep Mode 1`
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6. Configure bluetooth low power clock:
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- `Component config > Bluetooth > Controller Options > MODEM SLEEP Options > Bluetooth modem sleep > Bluetooth Modem sleep Mode 1 > Bluetooth low power clock`
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7. Enable power up main XTAL during light sleep:
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- `Component config > Bluetooth > Controller Options > MODEM SLEEP Options > [*] power up main XTAL during light sleep`
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### Build and Flash
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```
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idf.py -D SDKCONFIG_DEFAULTS="sdkconfig.defaults;sdkconfig.40m.esp32c3" set-target ESP32C3 build
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```
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* `-D SDKCONFIG_DEFAULTS` select configuration file to be used for creating app sdkconfig.
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* `set-target ` Set the chip target to build.
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To flash the project and see the output, run:
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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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When you run this example, the prints the following at the very begining:
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```
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I (333) cpu_start: Starting scheduler.
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I (347) pm: Frequency switching config: CPU_MAX: 160, APB_MAX: 80, APB_MIN: 40, Light sleep: ENABLED
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I (351) sleep: Enable automatic switching of GPIO sleep configuration
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I (358) BTDM_INIT: BT controller compile version [f2e5d81]
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I (365) BTDM_INIT: Bluetooth will use main XTAL as Bluetooth sleep clock.
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I (372) phy_init: phy_version 912,d001756,Jun 2 2022,16:28:07
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I (411) system_api: Base MAC address is not set
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I (412) system_api: read default base MAC address from EFUSE
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I (412) BTDM_INIT: Bluetooth MAC: 7c:df:a1:61:b6:f6
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I (419) NimBLE_BLE_PRPH: BLE Host Task Started
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I (424) uart: queue free spaces: 8
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I (432) NimBLE: GAP procedure initiated: stop advertising.
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I (435) NimBLE: Device Address:
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I (437) NimBLE: 7c:df:a1:61:b6:f6
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I (441) NimBLE:
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I (446) NimBLE: GAP procedure initiated: advertise;
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I (450) NimBLE: disc_mode=2
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I (453) NimBLE: adv_channel_map=0 own_addr_type=0 adv_filter_policy=0 adv_itvl_min=0 adv_itvl_max=0
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I (463) NimBLE:
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```
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## Typical current consumption with management enabled
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| | max current | modem sleep | light sleep (main XTAL)| light sleep (32KHz XTAL)|
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|-------- | ----------- | ------------ | ---------------------- |------------------------ |
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| ESP32 | 231 mA | 14.1 mA | X | 1.9 mA |
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| ESP32C3 | 262 mA | 12 mA | 2.3 mA | 140 uA |
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| ESP32S3 | 240 mA | 17.9 mA | 3.3 mA | 230 uA |
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X: This feature is currently not supported.
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## Example Breakdown
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- ESP32 does not support the use of main XTAL in light sleep mode, so an external 32kHz crystal is required. |