esp-idf/components/esp32/include/esp_system.h

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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef __ESP_SYSTEM_H__
#define __ESP_SYSTEM_H__
#include <stdint.h>
#include <stdbool.h>
#include "esp_err.h"
#include "esp_sleep.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef enum {
ESP_MAC_WIFI_STA,
ESP_MAC_WIFI_SOFTAP,
ESP_MAC_BT,
ESP_MAC_ETH,
} esp_mac_type_t;
#define TWO_UNIVERSAL_MAC_ADDR 2
#define FOUR_UNIVERSAL_MAC_ADDR 4
#define UNIVERSAL_MAC_ADDR_NUM CONFIG_NUMBER_OF_UNIVERSAL_MAC_ADDRESS
/**
* @attention application don't need to call this function anymore. It do nothing and will
* be removed in future version.
*/
void system_init(void) __attribute__ ((deprecated));
/**
* @brief Reset to default settings.
*
* Function has been deprecated, please use esp_wifi_restore instead.
* This name will be removed in a future release.
*/
void system_restore(void) __attribute__ ((deprecated));
typedef void (*shutdown_handler_t)(void);
/**
* @brief Register shutdown handler
*
* This function allows you to register a handler that gets invoked before a
* systematic shutdown of the chip.
*/
esp_err_t esp_register_shutdown_handler(shutdown_handler_t handle);
/**
* @brief Restart PRO and APP CPUs.
*
* This function can be called both from PRO and APP CPUs.
* After successful restart, CPU reset reason will be SW_CPU_RESET.
* Peripherals (except for WiFi, BT, UART0, SPI1, and legacy timers) are not reset.
* This function does not return.
*/
void esp_restart(void) __attribute__ ((noreturn));
/**
* @brief Internal function to restart PRO and APP CPUs.
*
* @note This function should not be called from FreeRTOS applications.
* Use esp_restart instead.
*
* This is an internal function called by esp_restart. It is called directly
* by the panic handler and brownout detector interrupt.
*/
void esp_restart_noos() __attribute__ ((noreturn));
/**
* @brief Restart system.
*
* Function has been renamed to esp_restart.
* This name will be removed in a future release.
*/
void system_restart(void) __attribute__ ((deprecated, noreturn));
/**
* @brief Get system time, unit: microsecond.
*
* This function is deprecated. Use 'gettimeofday' function for 64-bit precision.
* This definition will be removed in a future release.
*/
uint32_t system_get_time(void) __attribute__ ((deprecated));
/**
* @brief Get the size of available heap.
*
* Note that the returned value may be larger than the maximum contiguous block
* which can be allocated.
*
* @return Available heap size, in bytes.
*/
uint32_t esp_get_free_heap_size(void);
/**
* @brief Get the size of available heap.
*
* Function has been renamed to esp_get_free_heap_size.
* This name will be removed in a future release.
*
* @return Available heap size, in bytes.
*/
uint32_t system_get_free_heap_size(void) __attribute__ ((deprecated));
/**
* @brief Get the minimum heap that has ever been available
*
* @return Minimum free heap ever available
*/
uint32_t esp_get_minimum_free_heap_size( void );
/**
* @brief Get one random 32-bit word from hardware RNG
*
* The hardware RNG is fully functional whenever an RF subsystem is running (ie Bluetooth or WiFi is enabled). For secure
* random values, call this function after WiFi or Bluetooth are started.
*
* When the app is running without an RF subsystem enabled, it should be considered a PRNG. To help improve this
* situation, the RNG is pre-seeded with entropy while the IDF bootloader is running. However no new entropy is
* available during the window of time between when the bootloader exits and an RF subsystem starts. It may be possible
* to discern a non-random pattern in a very large amount of output captured during this window of time.
*
* @return Random value between 0 and UINT32_MAX
*/
uint32_t esp_random(void);
/**
* @brief Set base MAC address with the MAC address which is stored in BLK3 of EFUSE or
* external storage e.g. flash and EEPROM.
*
* Base MAC address is used to generate the MAC addresses used by the networking interfaces.
* If using base MAC address stored in BLK3 of EFUSE or external storage, call this API to set base MAC
* address with the MAC address which is stored in BLK3 of EFUSE or external storage before initializing
* WiFi/BT/Ethernet.
*
* @param mac base MAC address, length: 6 bytes.
*
* @return ESP_OK on success
*/
esp_err_t esp_base_mac_addr_set(uint8_t *mac);
/**
* @brief Return base MAC address which is set using esp_base_mac_addr_set.
*
* @param mac base MAC address, length: 6 bytes.
*
* @return ESP_OK on success
* ESP_ERR_INVALID_MAC base MAC address has not been set
*/
esp_err_t esp_base_mac_addr_get(uint8_t *mac);
/**
* @brief Return base MAC address which was previously written to BLK3 of EFUSE.
*
* Base MAC address is used to generate the MAC addresses used by the networking interfaces.
* This API returns the custom base MAC address which was previously written to BLK3 of EFUSE.
* Writing this EFUSE allows setting of a different (non-Espressif) base MAC address. It is also
* possible to store a custom base MAC address elsewhere, see esp_base_mac_addr_set() for details.
*
* @param mac base MAC address, length: 6 bytes.
*
* @return ESP_OK on success
* ESP_ERR_INVALID_VERSION An invalid MAC version field was read from BLK3 of EFUSE
* ESP_ERR_INVALID_CRC An invalid MAC CRC was read from BLK3 of EFUSE
*/
esp_err_t esp_efuse_mac_get_custom(uint8_t *mac);
/**
* @brief Return base MAC address which is factory-programmed by Espressif in BLK0 of EFUSE.
*
* @param mac base MAC address, length: 6 bytes.
*
* @return ESP_OK on success
*/
esp_err_t esp_efuse_mac_get_default(uint8_t *mac);
/**
* @brief Read hardware MAC address from efuse.
*
* Function has been renamed to esp_efuse_mac_get_default.
* This name will be removed in a future release.
*
* @param mac hardware MAC address, length: 6 bytes.
*
* @return ESP_OK on success
*/
esp_err_t esp_efuse_read_mac(uint8_t *mac) __attribute__ ((deprecated));
/**
* @brief Read hardware MAC address.
*
* Function has been renamed to esp_efuse_mac_get_default.
* This name will be removed in a future release.
*
* @param mac hardware MAC address, length: 6 bytes.
* @return ESP_OK on success
*/
esp_err_t system_efuse_read_mac(uint8_t *mac) __attribute__ ((deprecated));
/**
* @brief Read base MAC address and set MAC address of the interface.
*
* This function first get base MAC address using esp_base_mac_addr_get or reads base MAC address
* from BLK0 of EFUSE. Then set the MAC address of the interface including wifi station, wifi softap,
* bluetooth and ethernet.
*
* @param mac MAC address of the interface, length: 6 bytes.
* @param type type of MAC address, 0:wifi station, 1:wifi softap, 2:bluetooth, 3:ethernet.
*
* @return ESP_OK on success
*/
esp_err_t esp_read_mac(uint8_t* mac, esp_mac_type_t type);
/**
* @brief Derive local MAC address from universal MAC address.
*
* This function derives a local MAC address from an universal MAC address.
* A `definition of local vs universal MAC address can be found on Wikipedia
* <https://en.wikipedia.org/wiki/MAC_address#Universal_vs._local>`.
* In ESP32, universal MAC address is generated from base MAC address in EFUSE or other external storage.
* Local MAC address is derived from the universal MAC address.
*
* @param local_mac Derived local MAC address, length: 6 bytes.
* @param universal_mac Source universal MAC address, length: 6 bytes.
*
* @return ESP_OK on success
*/
esp_err_t esp_derive_local_mac(uint8_t* local_mac, const uint8_t* universal_mac);
/**
* Get SDK version
*
* This function is deprecated and will be removed in a future release.
*
* @return constant string "master"
*/
const char* system_get_sdk_version(void) __attribute__ ((deprecated));
/**
* Get IDF version
*
* @return constant string from IDF_VER
*/
const char* esp_get_idf_version(void);
/**
* @brief Chip models
*/
typedef enum {
CHIP_ESP32 = 1, //!< ESP32
} esp_chip_model_t;
/**
* Chip feature flags, used in esp_chip_info_t
*/
#define CHIP_FEATURE_EMB_FLASH BIT(0)
#define CHIP_FEATURE_WIFI_BGN BIT(1)
#define CHIP_FEATURE_BLE BIT(4)
#define CHIP_FEATURE_BT BIT(5)
/**
* @brief The structure represents information about the chip
*/
typedef struct {
esp_chip_model_t model; //!< chip model, one of esp_chip_model_t
uint32_t features; //!< bit mask of CHIP_FEATURE_x feature flags
uint8_t cores; //!< number of CPU cores
uint8_t revision; //!< chip revision number
} esp_chip_info_t;
/**
* @brief Fill an esp_chip_info_t structure with information about the chip
* @param[out] out_info structure to be filled
*/
void esp_chip_info(esp_chip_info_t* out_info);
#ifdef __cplusplus
}
#endif
#endif /* __ESP_SYSTEM_H__ */