diff --git a/components/esp32/Kconfig b/components/esp32/Kconfig index c514521972..3625ce59e0 100644 --- a/components/esp32/Kconfig +++ b/components/esp32/Kconfig @@ -548,18 +548,18 @@ config ESP32_RTC_CLK_CAL_CYCLES config ESP32_DEEP_SLEEP_WAKEUP_DELAY int "Extra delay in deep sleep wake stub (in us)" - default 0 + default 2000 range 0 5000 help When ESP32 exits deep sleep, the CPU and the flash chip are powered on at the same time. CPU will run deep sleep stub first, and then proceed to load code from flash. Some flash chips need sufficient time to pass between power on and first read operation. By default, - without any extra delay, this time is approximately 900us. - - If you are using a flash chip which needs more than 900us to become - ready after power on, set this parameter to add extra delay - to the default deep sleep stub. + without any extra delay, this time is approximately 900us, although + some flash chip types need more than that. + + By default extra delay is set to 2000us. When optimizing startup time + for applications which require it, this value may be reduced. If you are seeing "flash read err, 1000" message printed to the console after deep sleep reset, try increasing this value. diff --git a/examples/system/deep_sleep/sdkconfig.defaults b/examples/system/deep_sleep/sdkconfig.defaults index dd7da3f88d..78f466407f 100644 --- a/examples/system/deep_sleep/sdkconfig.defaults +++ b/examples/system/deep_sleep/sdkconfig.defaults @@ -4,4 +4,3 @@ CONFIG_ULP_COPROC_ENABLED=y CONFIG_ULP_COPROC_RESERVE_MEM=512 CONFIG_ESP32_TIME_SYSCALL_USE_RTC_FRC1=y CONFIG_ESP32_RTC_CLOCK_SOURCE_INTERNAL_RC=y -CONFIG_ESP32_DEEP_SLEEP_WAKEUP_DELAY=500 diff --git a/examples/system/ulp/sdkconfig.defaults b/examples/system/ulp/sdkconfig.defaults index 0ce9dc7632..f6d33f3948 100644 --- a/examples/system/ulp/sdkconfig.defaults +++ b/examples/system/ulp/sdkconfig.defaults @@ -1,9 +1,6 @@ # Enable ULP CONFIG_ULP_COPROC_ENABLED=y CONFIG_ULP_COPROC_RESERVE_MEM=1024 -# Some flash chips need extra time to wake up -# Set this a bit higher to improve out-of-the-box experience -CONFIG_ESP32_DEEP_SLEEP_WAKEUP_DELAY=500 # Set log level to Warning to produce clean output CONFIG_LOG_BOOTLOADER_LEVEL_WARN=y CONFIG_LOG_BOOTLOADER_LEVEL=2 diff --git a/examples/system/ulp_adc/sdkconfig.defaults b/examples/system/ulp_adc/sdkconfig.defaults index 68a23afddb..f6d33f3948 100644 --- a/examples/system/ulp_adc/sdkconfig.defaults +++ b/examples/system/ulp_adc/sdkconfig.defaults @@ -1,9 +1,6 @@ # Enable ULP CONFIG_ULP_COPROC_ENABLED=y CONFIG_ULP_COPROC_RESERVE_MEM=1024 -# Some flash chips need extra time to wake up -# Set this a bit higher to improve out-of-the-box experience -CONFIG_ESP32_DEEP_SLEEP_WAKEUP_DELAY=1000 # Set log level to Warning to produce clean output CONFIG_LOG_BOOTLOADER_LEVEL_WARN=y CONFIG_LOG_BOOTLOADER_LEVEL=2