examples: import_lib: simplify with fatfs partition generator

Instead of embedding the file and copying it to the FAT partition at
run time, generate the FAT partition with the file in it.

examples/build_system/cmake/import_lib/main/CMakeLists.txt

@@ -1,4 +1,7 @@
-idf_component_register(SRCS "main.cpp"
+idf_component_register(SRCS "import_lib_example_main.cpp"
                        INCLUDE_DIRS "."
-                       EMBED_TXTFILES sample.xml
                        PRIV_REQUIRES tinyxml2 fatfs)
+
+# Create a FAT filesystem image from the contents of data/ subdirectory,
+# The image will be flashed into the 'storage' partition when 'idf.py flash' is used.
+fatfs_create_spiflash_image(storage data FLASH_IN_PROJECT)

examples/build_system/cmake/import_lib/main/import_lib_example_main.cpp

@@ -0,0 +1,49 @@
+/*
+ * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include "esp_err.h"
+#include "esp_log.h"
+#include "esp_vfs_fat.h"
+#include "tinyxml2.h"
+
+static const char *TAG = "example";
+
+
+extern "C" void app_main(void)
+{
+    ESP_LOGI(TAG, "Initializing the filesystem");
+    esp_vfs_fat_mount_config_t mount_config = {};
+    mount_config.max_files = 1;
+
+    wl_handle_t wl_handle = WL_INVALID_HANDLE;
+    esp_err_t err = esp_vfs_fat_spiflash_mount_rw_wl("/spiflash", "storage", &mount_config, &wl_handle);
+    if (err != ESP_OK) {
+        ESP_LOGE(TAG, "Failed to mount FATFS (%s)", esp_err_to_name(err));
+        return;
+    }
+
+    // Load the XML file from the filesystem and parse it using tinyxml2
+    ESP_LOGI(TAG, "Reading XML file");
+    tinyxml2::XMLDocument data;
+    data.LoadFile("/spiflash/sample.xml");
+
+    tinyxml2::XMLPrinter printer;
+    data.Print(&printer);
+
+    ESP_LOGI(TAG, "Read XML data:\n%s", printer.CStr());
+
+    const char* to_data = data.FirstChildElement("note")->FirstChildElement("to")->GetText();
+    const char* from_data = data.FirstChildElement("note")->FirstChildElement("from")->GetText();
+    const char* heading_data = data.FirstChildElement("note")->FirstChildElement("heading")->GetText();
+    const char* body_data = data.FirstChildElement("note")->FirstChildElement("body")->GetText();
+
+    ESP_LOGI(TAG, "Parsed XML data:\n\nTo: %s\nFrom: %s\nHeading: %s\nBody: %s",
+                to_data, from_data, heading_data, body_data);
+
+    // Clean up
+    esp_vfs_fat_spiflash_unmount_rw_wl("/spiflash", wl_handle);
+
+    ESP_LOGI(TAG, "Example end");
+}

examples/build_system/cmake/import_lib/main/main.cpp

@@ -1,72 +0,0 @@
-#include <stdio.h>
-#include <string.h>
-#include <sys/unistd.h>
-#include <sys/stat.h>
-#include <stdlib.h>
-#include <string.h>
-#include "esp_err.h"
-#include "esp_log.h"
-#include "esp_vfs_fat.h"
-#include "tinyxml2.h"
-
-using namespace tinyxml2;
-
-static const char *TAG = "example";
-
-// Handle of the wear levelling library instance
-static wl_handle_t s_wl_handle = WL_INVALID_HANDLE;
-
-// Mount path for the partition
-const char *base_path = "/spiflash";
-
-extern "C" void app_main(void)
-{
-    // Do example setup
-    ESP_LOGI(TAG, "Setting up...");
-    esp_vfs_fat_mount_config_t mount_config;
-    mount_config.max_files = 4;
-    mount_config.format_if_mount_failed = true;
-    mount_config.allocation_unit_size = CONFIG_WL_SECTOR_SIZE;
-
-    esp_err_t err = esp_vfs_fat_spiflash_mount_rw_wl(base_path, "storage", &mount_config, &s_wl_handle);
-    if (err != ESP_OK) {
-        ESP_LOGE(TAG, "Failed to mount FATFS (%s)", esp_err_to_name(err));
-        return;
-    }
-
-    // The sample XML is embedded binary data. Create a file first containing the embedded
-    // so it can be accessed.
-    ESP_LOGI(TAG, "Copying sample XML to filesystem...");
-
-    extern const char data_start[] asm("_binary_sample_xml_start");
-    extern const char data_end[]   asm("_binary_sample_xml_end");
-    FILE *f = fopen("/spiflash/sample.xml", "wb");
-
-    if (f == NULL) {
-        ESP_LOGE(TAG, "Failed to open file for writing");
-        return;
-    }
-    fwrite(data_start, sizeof(char), data_end - data_start + 1, f);
-    fclose(f);
-
-    // Now that the file is created, load it using tinyxml2 and parse
-    ESP_LOGI(TAG, "Reading XML file");
-
-    XMLDocument data;
-    data.LoadFile("/spiflash/sample.xml");
-
-    XMLPrinter printer;
-    data.Print(&printer);
-
-    ESP_LOGI(TAG, "Read XML data:\n%s", printer.CStr());
-
-    const char* to_data = data.FirstChildElement("note")->FirstChildElement("to")->GetText();
-    const char* from_data = data.FirstChildElement("note")->FirstChildElement("from")->GetText();
-    const char* heading_data = data.FirstChildElement("note")->FirstChildElement("heading")->GetText();
-    const char* body_data = data.FirstChildElement("note")->FirstChildElement("body")->GetText();
-
-    ESP_LOGI(TAG, "Parsed XML data:\n\nTo: %s\nFrom: %s\nHeading: %s\nBody: %s",
-                to_data, from_data, heading_data, body_data);
-
-    ESP_LOGI(TAG, "Example end");
-}

tools/ci/check_copyright_ignore.txt

@@ -1733,7 +1733,6 @@ examples/bluetooth/nimble/bleprph_wifi_coex/main/bleprph.h
 examples/bluetooth/nimble/bleprph_wifi_coex/main/gatt_svr.c
 examples/bluetooth/nimble/bleprph_wifi_coex/main/main.c
 examples/build_system/cmake/component_manager/main/component_manager.c
-examples/build_system/cmake/import_lib/main/main.cpp
 examples/build_system/cmake/import_prebuilt/main/main.c
 examples/build_system/cmake/import_prebuilt/prebuilt/components/prebuilt/prebuilt.c
 examples/build_system/cmake/import_prebuilt/prebuilt/components/prebuilt/prebuilt.h