# # For a description of the syntax of this configuration file, # see kconfig/kconfig-language.txt. # mainmenu "Espressif IoT Development Framework Configuration" config IDF_CMAKE bool option env="IDF_CMAKE" config IDF_ENV_FPGA # This option is for internal use only bool config IDF_TARGET # This option records the IDF target when sdkconfig is generated the first time. # It is not updated if environment variable $IDF_TARGET changes later, and # the build system is responsible for detecting the mismatch between # CONFIG_IDF_TARGET and $IDF_TARGET. string default "$IDF_TARGET" config IDF_TARGET_ESP32 bool default "y" if IDF_TARGET="esp32" config IDF_TARGET_ESP32S2 bool default "y" if IDF_TARGET="esp32s2" select FREERTOS_UNICORE config IDF_FIRMWARE_CHIP_ID hex default 0x0000 if IDF_TARGET_ESP32 default 0x0002 if IDF_TARGET_ESP32S2 default 0xFFFF menu "SDK tool configuration" config SDK_TOOLPREFIX string "Compiler toolchain path/prefix" default "xtensa-esp32-elf-" if IDF_TARGET_ESP32 default "xtensa-esp32s2-elf-" if IDF_TARGET_ESP32S2 help The prefix/path that is used to call the toolchain. The default setting assumes a crosstool-ng gcc setup that is in your PATH. config SDK_PYTHON string "Python interpreter" depends on !IDF_CMAKE default "python" help The executable name/path that is used to run python. (Note: This option is used with the legacy GNU Make build system only.) config SDK_MAKE_WARN_UNDEFINED_VARIABLES bool "'make' warns on undefined variables" depends on !IDF_CMAKE default "y" help Adds --warn-undefined-variables to MAKEFLAGS. This causes make to print a warning any time an undefined variable is referenced. This option helps find places where a variable reference is misspelled or otherwise missing, but it can be unwanted if you have Makefiles which depend on undefined variables expanding to an empty string. (Note: this option is used with the legacy GNU Make build system only.) config SDK_TOOLCHAIN_SUPPORTS_TIME_WIDE_64_BITS bool "Toolchain supports time_t wide 64-bits" default n help Enable this option in case you have a custom toolchain which supports time_t wide 64-bits. This option checks time_t is 64-bits and disables ROM time functions to use the time functions from the toolchain instead. This option allows resolving the Y2K38 problem. See "Setup Linux Toolchain from Scratch" to build a custom toolchain which supports 64-bits time_t. Note: ESP-IDF does not currently come with any pre-compiled toolchain that supports 64-bit wide time_t. This will change in a future major release, but currently 64-bit time_t requires a custom built toolchain. endmenu # SDK tool configuration menu "Build type" choice APP_BUILD_TYPE prompt "Application build type" default APP_BUILD_TYPE_APP_2NDBOOT help Select the way the application is built. By default, the application is built as a binary file in a format compatible with the ESP32 bootloader. In addition to this application, 2nd stage bootloader is also built. Application and bootloader binaries can be written into flash and loaded/executed from there. Another option, useful for only very small and limited applications, is to only link the .elf file of the application, such that it can be loaded directly into RAM over JTAG. Note that since IRAM and DRAM sizes are very limited, it is not possible to build any complex application this way. However for kinds of testing and debugging, this option may provide faster iterations, since the application does not need to be written into flash. Note that at the moment, ESP-IDF does not contain all the startup code required to initialize the CPUs and ROM memory (data/bss). Therefore it is necessary to execute a bit of ROM code prior to executing the application. A gdbinit file may look as follows: # Connect to a running instance of OpenOCD target remote :3333 # Reset and halt the target mon reset halt # Run to a specific point in ROM code, # where most of initialization is complete. thb *0x40007901 c # Load the application into RAM load # Run till app_main tb app_main c Execute this gdbinit file as follows: xtensa-esp32-elf-gdb build/app-name.elf -x gdbinit Recommended sdkconfig.defaults for building loadable ELF files is as follows. CONFIG_APP_BUILD_TYPE_ELF_RAM is required, other options help reduce application memory footprint. CONFIG_APP_BUILD_TYPE_ELF_RAM=y CONFIG_VFS_SUPPORT_TERMIOS= CONFIG_NEWLIB_NANO_FORMAT=y CONFIG_ESP_SYSTEM_PANIC_PRINT_HALT=y CONFIG_ESP_DEBUG_STUBS_ENABLE= CONFIG_ESP_ERR_TO_NAME_LOOKUP= config APP_BUILD_TYPE_APP_2NDBOOT bool prompt "Default (binary application + 2nd stage bootloader)" select APP_BUILD_GENERATE_BINARIES select APP_BUILD_BOOTLOADER select APP_BUILD_USE_FLASH_SECTIONS config APP_BUILD_TYPE_ELF_RAM bool prompt "ELF file, loadable into RAM (EXPERIMENTAL))" endchoice # APP_BUILD_TYPE # Hidden options, set according to the choice above config APP_BUILD_GENERATE_BINARIES bool # Whether to generate .bin files or not config APP_BUILD_BOOTLOADER bool # Whether to build the bootloader config APP_BUILD_USE_FLASH_SECTIONS bool # Whether to place code/data into memory-mapped flash sections endmenu # Build type source "$COMPONENT_KCONFIGS_PROJBUILD_SOURCE_FILE" menu "Compiler options" choice COMPILER_OPTIMIZATION prompt "Optimization Level" default COMPILER_OPTIMIZATION_DEFAULT help This option sets compiler optimization level (gcc -O argument) for the app. - The "Default" setting will add the -0g flag to CFLAGS. - The "Size" setting will add the -0s flag to CFLAGS. - The "Performance" setting will add the -O2 flag to CFLAGS. - The "None" setting will add the -O0 flag to CFLAGS. The "Size" setting cause the compiled code to be smaller and faster, but may lead to difficulties of correlating code addresses to source file lines when debugging. The "Performance" setting causes the compiled code to be larger and faster, but will be easier to correlated code addresses to source file lines. "None" with -O0 produces compiled code without optimization. Note that custom optimization levels may be unsupported. Compiler optimization for the IDF bootloader is set separately, see the BOOTLOADER_COMPILER_OPTIMIZATION setting. config COMPILER_OPTIMIZATION_DEFAULT bool "Debug (-Og)" config COMPILER_OPTIMIZATION_SIZE bool "Optimize for size (-Os)" config COMPILER_OPTIMIZATION_PERF bool "Optimize for performance (-O2)" config COMPILER_OPTIMIZATION_NONE bool "Debug without optimization (-O0)" endchoice choice COMPILER_OPTIMIZATION_ASSERTION_LEVEL prompt "Assertion level" default COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE help Assertions can be: - Enabled. Failure will print verbose assertion details. This is the default. - Set to "silent" to save code size (failed assertions will abort() but user needs to use the aborting address to find the line number with the failed assertion.) - Disabled entirely (not recommended for most configurations.) -DNDEBUG is added to CPPFLAGS in this case. config COMPILER_OPTIMIZATION_ASSERTIONS_ENABLE prompt "Enabled" bool help Enable assertions. Assertion content and line number will be printed on failure. config COMPILER_OPTIMIZATION_ASSERTIONS_SILENT prompt "Silent (saves code size)" bool help Enable silent assertions. Failed assertions will abort(), user needs to use the aborting address to find the line number with the failed assertion. config COMPILER_OPTIMIZATION_ASSERTIONS_DISABLE prompt "Disabled (sets -DNDEBUG)" bool help If assertions are disabled, -DNDEBUG is added to CPPFLAGS. endchoice # assertions menuconfig COMPILER_CXX_EXCEPTIONS bool "Enable C++ exceptions" default n help Enabling this option compiles all IDF C++ files with exception support enabled. Disabling this option disables C++ exception support in all compiled files, and any libstdc++ code which throws an exception will abort instead. Enabling this option currently adds an additional ~500 bytes of heap overhead when an exception is thrown in user code for the first time. config COMPILER_CXX_EXCEPTIONS_EMG_POOL_SIZE int "Emergency Pool Size" default 0 depends on COMPILER_CXX_EXCEPTIONS help Size (in bytes) of the emergency memory pool for C++ exceptions. This pool will be used to allocate memory for thrown exceptions when there is not enough memory on the heap. config COMPILER_CXX_RTTI bool "Enable C++ run-time type info (RTTI)" default n help Enabling this option compiles all C++ files with RTTI support enabled. This increases binary size (typically by tens of kB) but allows using dynamic_cast conversion and typeid operator. choice COMPILER_STACK_CHECK_MODE prompt "Stack smashing protection mode" default COMPILER_STACK_CHECK_MODE_NONE help Stack smashing protection mode. Emit extra code to check for buffer overflows, such as stack smashing attacks. This is done by adding a guard variable to functions with vulnerable objects. The guards are initialized when a function is entered and then checked when the function exits. If a guard check fails, program is halted. Protection has the following modes: - In NORMAL mode (GCC flag: -fstack-protector) only functions that call alloca, and functions with buffers larger than 8 bytes are protected. - STRONG mode (GCC flag: -fstack-protector-strong) is like NORMAL, but includes additional functions to be protected -- those that have local array definitions, or have references to local frame addresses. - In OVERALL mode (GCC flag: -fstack-protector-all) all functions are protected. Modes have the following impact on code performance and coverage: - performance: NORMAL > STRONG > OVERALL - coverage: NORMAL < STRONG < OVERALL config COMPILER_STACK_CHECK_MODE_NONE bool "None" config COMPILER_STACK_CHECK_MODE_NORM bool "Normal" config COMPILER_STACK_CHECK_MODE_STRONG bool "Strong" config COMPILER_STACK_CHECK_MODE_ALL bool "Overall" endchoice config COMPILER_STACK_CHECK bool default !COMPILER_STACK_CHECK_MODE_NONE help Stack smashing protection. config COMPILER_WARN_WRITE_STRINGS bool "Enable -Wwrite-strings warning flag" default "n" help Adds -Wwrite-strings flag for the C/C++ compilers. For C, this gives string constants the type ``const char[]`` so that copying the address of one into a non-const ``char *`` pointer produces a warning. This warning helps to find at compile time code that tries to write into a string constant. For C++, this warns about the deprecated conversion from string literals to ``char *``. config COMPILER_DISABLE_GCC8_WARNINGS bool "Disable new warnings introduced in GCC 6 - 8" default "n" help Enable this option if using GCC 6 or newer, and wanting to disable warnings which don't appear with GCC 5. endmenu # Compiler Options menu "Component config" source "$COMPONENT_KCONFIGS_SOURCE_FILE" endmenu menu "Compatibility options" config LEGACY_INCLUDE_COMMON_HEADERS bool "Include headers across components as before IDF v4.0" default n help Soc, esp32, and driver components, the most common components. Some header of these components are included implicitly by headers of other components before IDF v4.0. It's not required for high-level components, but still included through long header chain everywhere. This is harmful to the modularity. So it's changed in IDF v4.0. You can still include these headers in a legacy way until it is totally deprecated by enable this option. endmenu #Compatibility options