ESP8266_RTOS - 儲存篇(3) spiffs文件系統

前言

  spiffs是一個用於SPI NOR FLAH設備的文件系統，支持磨損均衡與文件系統一致的功能。

雖然是文件系統，不過目前不支持目錄

程式碼

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void app_main(void) { ESP_LOGI(TAG, "Initializing SPIFFS"); esp_vfs_spiffs_conf_t conf = { .base_path = "/spiffs", .partition_label = NULL, .max_files = 5, .format_if_mount_failed = true }; // Use settings defined above to initialize and mount SPIFFS filesystem. // Note: esp_vfs_spiffs_register is an all-in-one convenience function. esp_err_t ret = esp_vfs_spiffs_register(&conf); if (ret != ESP_OK) { if (ret == ESP_FAIL) { ESP_LOGE(TAG, "Failed to mount or format filesystem"); } else if (ret == ESP_ERR_NOT_FOUND) { ESP_LOGE(TAG, "Failed to find SPIFFS partition"); } else { ESP_LOGE(TAG, "Failed to initialize SPIFFS (%s)", esp_err_to_name(ret)); } return; } size_t total = 0, used = 0; ret = esp_spiffs_info(NULL, &total, &used); if (ret != ESP_OK) { ESP_LOGE(TAG, "Failed to get SPIFFS partition information (%s)", esp_err_to_name(ret)); } else { ESP_LOGI(TAG, "Partition size: total: %d, used: %d", total, used); } // Use POSIX and C standard library functions to work with files. // First create a file. ESP_LOGI(TAG, "Opening file"); FILE* f = fopen("/spiffs/hello.txt", "w"); if (f == NULL) { ESP_LOGE(TAG, "Failed to open file for writing"); return; } fprintf(f, "Hello World!\n"); fclose(f); ESP_LOGI(TAG, "File written"); // Check if destination file exists before renaming struct stat st; if (stat("/spiffs/foo.txt", &st) == 0) { // Delete it if it exists unlink("/spiffs/foo.txt"); } // Rename original file ESP_LOGI(TAG, "Renaming file"); if (rename("/spiffs/hello.txt", "/spiffs/foo.txt") != 0) { ESP_LOGE(TAG, "Rename failed"); return; } // Open renamed file for reading ESP_LOGI(TAG, "Reading file"); f = fopen("/spiffs/foo.txt", "r"); if (f == NULL) { ESP_LOGE(TAG, "Failed to open file for reading"); return; } char line[64]; fgets(line, sizeof(line), f); fclose(f); // strip newline char* pos = strchr(line, '\n'); if (pos) { *pos = '\0'; } ESP_LOGI(TAG, "Read from file: '%s'", line); // All done, unmount partition and disable SPIFFS esp_vfs_spiffs_unregister(NULL); ESP_LOGI(TAG, "SPIFFS unmounted"); }

這滿簡單的範例，在example/storage/spiffs