esp_system.h

// 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_attr.h"
#include "esp_bit_defs.h"
#include "esp_idf_version.h"

#include "sdkconfig.h"

// For backward compatibility. These headers
// contains hardware operation functions and definitions
// that were originally declared in this header.
#include "esp_mac.h"
#include "esp_chip_info.h"
#include "esp_random.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief Reset reasons
 */
typedef enum {
    ESP_RST_UNKNOWN,    //!< Reset reason can not be determined
    ESP_RST_POWERON,    //!< Reset due to power-on event
    ESP_RST_EXT,        //!< Reset by external pin (not applicable for ESP32)
    ESP_RST_SW,         //!< Software reset via esp_restart
    ESP_RST_PANIC,      //!< Software reset due to exception/panic
    ESP_RST_INT_WDT,    //!< Reset (software or hardware) due to interrupt watchdog
    ESP_RST_TASK_WDT,   //!< Reset due to task watchdog
    ESP_RST_WDT,        //!< Reset due to other watchdogs
    ESP_RST_DEEPSLEEP,  //!< Reset after exiting deep sleep mode
    ESP_RST_BROWNOUT,   //!< Brownout reset (software or hardware)
    ESP_RST_SDIO,       //!< Reset over SDIO
} esp_reset_reason_t;

/**
 * Shutdown handler type
 */
typedef void (*shutdown_handler_t)(void);

/**
  * @brief  Register shutdown handler
  *
  * This function allows you to register a handler that gets invoked before
  * the application is restarted using esp_restart function.
  * @param handle function to execute on restart
  * @return
  *   - ESP_OK on success
  *   - ESP_ERR_INVALID_STATE if the handler has already been registered
  *   - ESP_ERR_NO_MEM if no more shutdown handler slots are available
  */
esp_err_t esp_register_shutdown_handler(shutdown_handler_t handle);

/**
  * @brief  Unregister shutdown handler
  *
  * This function allows you to unregister a handler which was previously
  * registered using esp_register_shutdown_handler function.
  *   - ESP_OK on success
  *   - ESP_ERR_INVALID_STATE if the given handler hasn't been registered before
  */
esp_err_t esp_unregister_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  Get reason of last reset
 * @return See description of esp_reset_reason_t for explanation of each value.
 */
esp_reset_reason_t esp_reset_reason(void);

/**
  * @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 internal heap.
  *
  * Note that the returned value may be larger than the maximum contiguous block
  * which can be allocated.
  *
  * @return Available internal heap size, in bytes.
  */
uint32_t esp_get_free_internal_heap_size(void);

/**
  * @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 Trigger a software abort
 *
 * @param details Details that will be displayed during panic handling.
 */
void  __attribute__((noreturn)) esp_system_abort(const char* details);

#ifdef __cplusplus
}
#endif

#endif /* __ESP_SYSTEM_H__ */