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Software reset¶

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To perform software reset of the chip, esp_restart() function is provided. When the function is called, execution of the program will stop, both CPUs will be reset, application will be loaded by the bootloader and started again.

Additionally, esp_register_shutdown_handler() function is provided to register a routine which needs to be called prior to restart (when done by esp_restart()). This is similar to the functionality of atexit POSIX function.

Reset reason¶

ESP-IDF application can be started or restarted due to a variety of reasons. To get the last reset reason, call esp_reset_reason() function. See description of esp_reset_reason_t for the list of possible reset reasons.

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Heap memory¶

Two heap memory related functions are provided:

• esp_get_free_heap_size() returns the current size of free heap memory

• esp_get_minimum_free_heap_size() returns the minimum size of free heap memory that was available during program execution.

Note that ESP-IDF supports multiple heaps with different capabilities. Functions mentioned in this section return the size of heap memory which can be allocated using malloc family of functions. For further information about heap memory see Heap Memory Allocation.

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Random number generation¶

ESP32 contains a hardware random number generator, values from it can be obtained using esp_random().

When Wi-Fi or Bluetooth are enabled, numbers returned by hardware random number generator (RNG) can be considered true random numbers. Without Wi-Fi or Bluetooth enabled, hardware RNG is a pseudo-random number generator. At startup, ESP-IDF bootloader seeds the hardware RNG with entropy, but care must be taken when reading random values between the start of app_main and initialization of Wi-Fi or Bluetooth drivers.

MAC Address¶

These APIs allow querying and customizing MAC addresses for different network interfaces that supported (e.g. Wi-Fi, Bluetooth, Ethernet).

To fetch MAC address for a specific interface (e.g. Wi-Fi, Bluetooth, Ethernet), call the function esp_read_mac() function.

In ESP-IDF these addresses are calculated from a single Base MAC address. By default, the Espressif base MAC address is used. This MAC is pre-programmed into ESP32 eFuse from the factory.

Note

The default configurationis 4 universally administered MAC addresses, and this is recommended when usingEspressif-provided MAC addresses.

Custom Base MAC¶

The default Base MAC is pre-programmed by Espressif in eFuse BLK0. To set a custom Base MAC instead, call the function esp_base_mac_addr_set() before initializing any network interfaces or calling the esp_read_mac() function. The customized MAC address can be stored in any supported storage device (e.g. Flash, NVS, etc).

The custom base MAC addresses should be allocated such that derived MAC addresses will not overlap. Configure the option CONFIG_ESP32_UNIVERSAL_MAC_ADDRESSES to set the number of valid universal MAC addresses that can be derived from the custom base MAC, according to the table above.

Note

It is also possible to call the function esp_netif_set_mac() to set the specific MAC used by a network interface, after network initialization. It's recommended to use the Base MAC approach documented here instead, to avoid the possibility of the original MAC address briefly appearing on the network before it is changed.

Custom MAC address in eFuse¶

When reading custom MAC addresses from eFuse, ESP-IDF provides a helper function esp_efuse_mac_get_custom(). This loads the MAC address from eFuse BLK3. This function assumes that the custom base MAC address is stored in the following format:

Once MAC address has been obtained using esp_efuse_mac_get_custom(), call esp_base_mac_addr_set() to set this MAC address as base MAC address.

Local vs Universal MAC addresses¶

ESP32 comes pre-programmed with enough valid Espressif universally administered MAC addresses for all internal interfaces. The specific calculations to derive an interface's MAC address from the base MAC address is shown in the table above..

When using a custom MAC address scheme, it's possible that not all interfaces can be assigned a universally administered MAC address. In these cases, a locally administered MAC address is assigned. Note that these addresses are intended for use on a single local network, only.

See this article for the definition of local and universally administered MAC addresses.

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Function esp_derive_local_mac() is called internally to derive a local MAC address from a universal MAC address. The process is as follows:

1. The U/L bit (bit value 0x2) is set in the first octet of the universal MAC address, creating a local MAC address.

2. If this bit is already set in the supplied universal MAC address (meaning: the supplied 'universal' MAC address was in fact already a local MAC address), then the first octet of the local MAC address is XORed with 0x4.

Chip version¶

esp_chip_info() function fills esp_chip_info_t structure with information about the chip. This includes the chip revision, number of CPU cores, and a bit mask of features enabled in the chip.

SDK version¶

esp_get_idf_version() returns a string describing the IDF version which was used to compile the application. This is the same value as the one available through IDF_VER variable of the build system. The version string generally has the format of gitdescribe output.

To get the version at build time, additional version macros are provided. They can be used to enable or disable parts of the program depending on IDF version.

• ESP_IDF_VERSION_MAJOR, ESP_IDF_VERSION_MINOR, ESP_IDF_VERSION_PATCH are defined to integers representing major, minor, and patch version.

• ESP_IDF_VERSION_VAL and ESP_IDF_VERSION can be used when implementing version checks:

App version¶

Application version is stored in esp_app_desc_t structure. It is located in DROM sector and has a fixed offset from the beginning of the binary file.The structure is located after esp_image_header_t and esp_image_segment_header_t structures. The field version has string type and max length 32 chars.

To set version in your project manually you need to set PROJECT_VER variable in your project CMakeLists.txt/Makefile:

• In application CMakeLists.txt put set(PROJECT_VER'0.1.0.1') before including project.cmake.

(For legacy GNU Make build system: in application Makefile put PROJECT_VER='0.1.0.1' before including project.mk.)

If CONFIG_APP_PROJECT_VER_FROM_CONFIG option is set, the value of CONFIG_APP_PROJECT_VER will be used. Otherwise if PROJECT_VER variable is not set in the project then it will be retrieved from either $(PROJECT_PATH)/version.txt file (if present) else using git command gitdescribe. If neither is available then PROJECT_VER will be set to '1'. Application can make use of this by calling esp_ota_get_app_description() or esp_ota_get_partition_description() functions.

API Reference¶

Functions¶

Register shutdown handler.

This function allows you to register a handler that gets invoked before the application is restarted using esp_restart function.

• 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

• handle: function to execute on restart

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

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.

Get reason of last reset.

See description of esp_reset_reason_t for explanation of each value.

Get the size of available heap.

Note that the returned value may be larger than the maximum contiguous block which can be allocated.

Available heap size, in bytes.

Get the size of available internal heap.

Note that the returned value may be larger than the maximum contiguous block which can be allocated.

Available internal heap size, in bytes.

Get the minimum heap that has ever been available.

Minimum free heap ever available

Trigger a software abort.

• details: Details that will be displayed during panic handling.

Type Definitions¶

Shutdown handler type

Enumerations¶

Reset reasons.

Values:

Reset reason can not be determined.

Reset due to power-on event.

Reset by external pin (not applicable for ESP32)

Software reset via esp_restart.

Software reset due to exception/panic.

Reset (software or hardware) due to interrupt watchdog.

Reset due to task watchdog.

Reset due to other watchdogs.

Reset after exiting deep sleep mode.

Brownout reset (software or hardware)

Reset over SDIO.

Functions¶

Return full IDF version string, same as ‘git describe' output.

If you are printing the ESP-IDF version in a log file or other information, this function provides more information than using the numerical version macros. For example, numerical version macros don't differentiate between development, pre-release and release versions, but the output of this function does.

constant string from IDF_VER

Macros¶

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Major version number (X.x.x)

Minor version number (x.X.x)

Patch version number (x.x.X)

Macro to convert IDF version number into an integer

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To be used in comparisons, such as ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 0, 0)

Current IDF version, as an integer

To be used in comparisons, such as ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 0, 0)

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How is it possible to make the other spinner revolve around the center like the earth revolves around the sun?

There is an invisible spinner that it is attached to (:

how do i make an area that vanishes for the marbles to start

The newer version of this game is hosted on my GitHub:

https://hawslc.github.io./marble-race-generator

The GitHub version fixed a lot of bugs and has support for the import and export features. Thanks!

yes, this is a problem with the webGL version. If you can't get the desktop version, try a newer version on my GitHub:

hawslc.github.io./marble-race-generator

This new version has support for the import and export features.

Go into settings and click on the green button! This will make it so that only your tracks will be generated.

could you add explosive blocks that trigger an explosion with an adjustable power when touched?

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it was fun but how can i find 1 that is countryes marble rac

your welcome! I haven't been here a lot and it means o lot to have a comment. But to me, this is such a good game, and randoms are hard to make-at least that's what they told me...

whenever I hit play it just shows a dead Square Face and I am assuming that it crashed!!!

probably so, this could be caused by a html5 update. Sorry.

does it take long to load the track editor or if the track editor folder is extracted where will it be placed

The track editor is a scene in Unity, and the data for each track is stored in a static class called DataTransfer.