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esp_system: add CONFIG_ESP_SYSTEM_RTC_EXT_CRYS

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morris
2020-07-14 20:39:30 +08:00
parent 204cb341b1
commit 6316e6eba2
6 changed files with 32 additions and 30 deletions
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18
components/esp32/Kconfig
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@@ -540,6 +540,7 @@ menu "ESP32-specific"
bool "Internal 150kHz RC oscillator"
config ESP32_RTC_CLK_SRC_EXT_CRYS
bool "External 32kHz crystal"
select ESP_SYSTEM_RTC_EXT_XTAL
config ESP32_RTC_CLK_SRC_EXT_OSC
bool "External 32kHz oscillator at 32K_XP pin"
config ESP32_RTC_CLK_SRC_INT_8MD256
@@ -591,23 +592,6 @@ menu "ESP32-specific"
Increase this option if the 32k crystal oscillator
does not start and switches to internal RC.
config ESP32_RTC_XTAL_BOOTSTRAP_CYCLES
int "Bootstrap cycles for external 32kHz crystal"
depends on ESP32_RTC_CLK_SRC_EXT_CRYS
default 5
range 0 32768
help
To reduce the startup time of an external RTC crystal,
we bootstrap it with a 32kHz square wave for a fixed number of cycles.
Setting 0 will disable bootstrapping (if disabled, the crystal may take
longer to start up or fail to oscillate under some conditions).
If this value is too high, a faulty crystal may initially start and then fail.
If this value is too low, an otherwise good crystal may not start.
To accurately determine if the crystal has started,
set a larger "Number of cycles for RTC_SLOW_CLK calibration" (about 3000).
config ESP32_DEEP_SLEEP_WAKEUP_DELAY
int "Extra delay in deep sleep wake stub (in us)"
default 2000