alex/esp-idf
1
0
Fork 0
mirror of https://github.com/espressif/esp-idf.git synced 2025-09-30 19:19:21 +00:00
Code Issues Packages Projects Releases Wiki Activity

component/bt: Add option to configure BLE SCA through menuconfig and use a fixed value of clock cycle to estimate sleep duration for external 32kHz oscillator

Browse Source
This commit is contained in:
wangmengyang
2019-04-09 20:56:38 +08:00
committed by baohongde
parent 7403e8e11c
commit ff2c583a0d
4 changed files with 69 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
components/bt/Kconfig
View File

@@ -161,23 +161,65 @@ menu Bluetooth
prompt "Bluetooth low power clock"
depends on BTDM_MODEM_SLEEP_MODE_ORIG
help
Select the low power clock source for bluetooth controller
Select the low power clock source for bluetooth controller. Bluetooth low power clock is
the clock source to maintain time in sleep mode.
- "Main crystal" option provides good accuracy and can support Dynamic Frequency Scaling
to be used with Bluetooth modem sleep. Light sleep is not supported.
- "External 32kHz crystal" option allows user to use a 32.768kHz crystal as Bluetooth low
power clock. This option is allowed as long as External 32kHz crystal is configured as
the system RTC clock source. This option provides good accuracy and supports Bluetooth
modem sleep to be used alongside Dynamic Frequency Scaling or light sleep.
config BTDM_LPCLK_SEL_MAIN_XTAL
bool "Main crystal"
help
Main crystal can be used as low power clock for bluetooth modem sleep. If this option is
selected, bluetooth modem sleep can work under Dynamic Frequency Scaling(DFS) enabled, but
cannot work when light sleep is enabled. Main crystal has a relatively better performance than
other bluetooth low power clock sources.
cannot work when light sleep is enabled. Main crystal has a good performance in accuracy as
the bluetooth low power clock source.
config BTDM_LPCLK_SEL_EXT_32K_XTAL
bool "External 32kHz crystal"
depends on ESP32_RTC_CLK_SRC_EXT_CRYS
help
External 32kHz crystal has a nominal frequency of 32.768kHz and provides good frequency
stability. If used as Bluetooth low power clock, External 32kHz can support Bluetooth
modem sleep to be used with both DFS and light sleep.
endchoice
endmenu
choice BTDM_BLE_SLEEP_CLOCK_ACCURACY
prompt "BLE Sleep Clock Accuracy"
depends on BTDM_CTRL_MODE_BLE_ONLY || BTDM_CTRL_MODE_BTDM
default BTDM_BLE_DEFAULT_SCA_250PPM
help
BLE Sleep Clock Accuracy(SCA) for the local device is used to estimate window widening in BLE
connection events. With a lower level of clock accuracy(e.g. 500ppm over 250ppm), the slave
needs a larger RX window to synchronize with master in each anchor point, thus resulting in an
increase of power consumption but a higher level of robustness in keeping connected. According
to the requirements of Bluetooth Core specification 4.2, the worst-case accuracy of Classic
Bluetooth low power oscialltor(LPO) is +/-250ppm in STANDBY and in low power modes such as
sniff. For BLE the worst-case SCA is +/-500ppm.
- "151ppm to 250ppm" option is the default value for Bluetooth Dual mode
- "251ppm to 500ppm" option can be used in BLE only mode when using external 32kHz crystal as
low power clock. This option is provided in case that BLE sleep clock has a lower level of
accuracy, or other error sources contribute to the inaccurate timing during sleep.
config BTDM_BLE_DEFAULT_SCA_500PPM
bool "251ppm to 500ppm"
depends on BTDM_LPCLK_SEL_EXT_32K_XTAL && BTDM_CTRL_MODE_BLE_ONLY
config BTDM_BLE_DEFAULT_SCA_250PPM
bool "151ppm to 250ppm"
endchoice
config BTDM_BLE_SLEEP_CLOCK_ACCURACY_INDEX_EFF
int
default 0 if BTDM_BLE_DEFAULT_SCA_500PPM
default 1 if BTDM_BLE_DEFAULT_SCA_250PPM
default 1
config BTDM_BLE_SCAN_DUPL
bool "BLE Scan Duplicate Options"
depends on (BTDM_CTRL_MODE_BTDM || BTDM_CTRL_MODE_BLE_ONLY)