Support for building and running external apps (#112)

Libraries/elf_loader/examples/build_elf_file_example/CMakeLists.txt

@@ -0,0 +1,11 @@
+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(hello_world)
+
+include(elf_loader)
+project_elf(hello_world)

Libraries/elf_loader/examples/build_elf_file_example/README.md

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+## Build ELF file Example
+
+This example shows how to build ELF file.
+
+## How to Use Example
+
+Before project configuration and build, be sure to set the correct chip target using `idf.py set-target <chip_name>`.
+
+* Note: Only ESP32, ESP32-S2 and ESP32-S3 are supported
+
+### Build and Flash
+
+Run `idf.py build` to build project, and when compiling is done you can see `hello_world.app.elf` in `build` directory.

Libraries/elf_loader/examples/build_elf_file_example/main/CMakeLists.txt

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+idf_component_register(SRCS "main.c")

Libraries/elf_loader/examples/build_elf_file_example/main/idf_component.yml

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+dependencies:
+  elf_loader:
+    version: "0.*"
+    override_path: "../../../../components/elf_loader"
+

Libraries/elf_loader/examples/build_elf_file_example/main/main.c

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+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+
+char buffer[] = "hello world %d\n";
+static int s_cnt;
+
+int try_test(void)
+{
+    for (int i = 0; i < 10; i++) {
+        printf(buffer, s_cnt++);
+        sleep(1);
+    }
+
+    return 0;
+}
+
+int main(int argc, char *argv[])
+{
+    try_test();
+
+    return 0;
+}

Libraries/elf_loader/examples/build_elf_file_example/sdkconfig.defaults

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+CONFIG_ESP_SYSTEM_MEMPROT_FEATURE_LOCK=n