Espressif ESP32-S2 User Manual

Chapter 2. API Reference
This function must not be called from an ISR. If esp_pm_lock_acquire/release are called while this function
is running, inconsistent results may be reported.
Return
• ESP_OK on success
• ESP_ERR_NOT_SUPPORTED if CONFIG_PM_ENABLE is not enabled in sdkconfig
Parameters
• stream: stream to print information to; use stdout or stderr to print to the console; use fmemo-
pen/open_memstream to print to a string buffer.
Type Definitions
typedef struct esp_pm_lock *esp_pm_lock_handle_t
Opaque handle to the power management lock.
Enumerations
enum esp_pm_lock_type_t
Power management constraints.
Values:
ESP_PM_CPU_FREQ_MAX
Require CPU frequency to be at the maximum value set via esp_pm_configure. Argument is unused and
should be set to 0.
ESP_PM_APB_FREQ_MAX
Require APB frequency to be at the maximum value supported by the chip. Argument is unused and
should be set to 0.
ESP_PM_NO_LIGHT_SLEEP
Prevent the system from going into light sleep. Argument is unused and should be set to 0.
Header File
• components/esp_pm/include/esp32s2/pm.h
Structures
struct esp_pm_config_esp32s2_t
Power management config for ESP32.
Pass a pointer to this structure as an argument to esp_pm_configure function.
Public Members
int max_freq_mhz
Maximum CPU frequency, in MHz
int min_freq_mhz
Minimum CPU frequency to use when no locks are taken, in MHz
bool light_sleep_enable
Enter light sleep when no locks are taken
2.6.22 Random Number Generation
ESP32-S2 contains a hardware random number generator, values from it can be obtained using the APIs
esp_random() and esp_fill_random().
The hardware RNG produces true random numbers under any of the following conditions:
Espressif Systems 1035
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Espressif ESP32-S2 Specifications

General

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