Espressif ESP32-S2 User Manual

Chapter 2. API Reference
CONFIG_PM_ENABLE
Support for power management
Found in: Component config > Power Management
If enabled, application is compiled with support for power management. This option has run-time over-
head (increased interrupt latency, longer time to enter idle state), and it also reduces accuracy of RTOS
ticks and timers used for timekeeping. Enable this option if application uses power management APIs.
Default value:
• No (disabled)
CONFIG_PM_DFS_INIT_AUTO
Enable dynamic frequency scaling (DFS) at startup
Found in: Component config > Power Management > CONFIG_PM_ENABLE
If enabled, startup code configures dynamic frequency scaling. Max CPU frequency is set to DE-
FAULT_CPU_FREQ_MHZ setting, min frequency is set to XTAL frequency. If disabled, DFS will
not be active until the application configures it using esp_pm_configure function.
Default value:
• No (disabled) if CONFIG_PM_ENABLE
CONFIG_PM_PROFILING
Enable profiling counters for PM locks
Found in: Component config > Power Management > CONFIG_PM_ENABLE
If enabled, esp_pm_* functions will keep track of the amount of time each of the power management
locks has been held, and esp_pm_dump_locks function will print this information. This feature can be
used to analyze which locks are preventing the chip from going into a lower power state, and see what
time the chip spends in each power saving mode. This feature does incur some run-time overhead, so
should typically be disabled in production builds.
Default value:
• No (disabled) if CONFIG_PM_ENABLE
CONFIG_PM_TRACE
Enable debug tracing of PM using GPIOs
Found in: Component config > Power Management > CONFIG_PM_ENABLE
If enabled, some GPIOs will be used to signal events such as RTOS ticks, frequency switching, entry/exit
from idle state. Refer to pm_trace.c file for the list of GPIOs. This feature is intended to be used when
analyzing/debugging behavior of power management implementation, and should be kept disabled in
applications.
Default value:
• No (disabled) if CONFIG_PM_ENABLE
CONFIG_PM_SLP_IRAM_OPT
Put lightsleep related codes in internal RAM
Found in: Component config > Power Management
If enabled, about 1.8KB of lightsleep related source code would be in IRAM and chip would sleep
longer for 760us at most each time. This feature is intended to be used when lower power consumption
is needed while there is enough place in IRAM to place source code.
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Release v4.4

Espressif ESP32-S2 Specifications

General

Brand	Espressif
Model	ESP32-S2
Category	Single board computers
Language	English