ESP32 Forum

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# ESP-IDF Partition Table
# Name,		Type,	SubType,	Offset,		Size,	Flags
  nvs,		data,	nvs,		0x9000,		24K,
  phy_init,	data,	phy,		0xf000,		4K,
  factory,	app,	factory,	0x10000,	1500K,
  spiffs,	data,	spiffs,		,		1M,	,

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total 288
-rw-r--r--  1 bcolbert  staff    20K Jul 23 08:41 drip.raw
-rw-r--r--  1 bcolbert  staff   118K Jul 23 08:41 sonar.raw

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mkspiffs -c spiffs -b 4096 -p 256 -s 0x100000 spiffs.bin

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esptool.py --chip esp32 write_flash -z 0x187000 spiffs.bin

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   ESP_LOGI(BT_APP_CORE_TAG, "Initializing SPIFFS");

    esp_vfs_spiffs_conf_t conf = {
      .base_path = "/spiffs",
      .partition_label = NULL,
      .max_files = 5,
      .format_if_mount_failed = false
    };

    // 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(BT_APP_CORE_TAG, "Failed to mount or format filesystem");
        } else if (ret == ESP_ERR_NOT_FOUND) {
            ESP_LOGE(BT_APP_CORE_TAG, "Failed to find SPIFFS partition");
        } else {
            ESP_LOGE(BT_APP_CORE_TAG, "Failed to initialize SPIFFS (%s)", esp_err_to_name(ret));
        }
        return;
    }

    size_t total = 0, used = 0;
    ret = esp_spiffs_info(conf.partition_label, &total, &used);
    if (ret != ESP_OK) {
        ESP_LOGE(BT_APP_CORE_TAG, "Failed to get SPIFFS partition information (%s)", esp_err_to_name(ret));
    } else {
        ESP_LOGI(BT_APP_CORE_TAG, "Partition size: total: %d, used: %d", total, used);
    }

    struct stat st;
    if (stat(filename, &st) == 0) {
        // Delete it if it exists
        ESP_LOGI(BT_APP_CORE_TAG, "!!! %s is there", filename);
    }

    ESP_LOGI(BT_APP_CORE_TAG, "Opening file %s", filename);
    FILE* fd = fopen(filename, "r");
    if (fd) {
        ESP_LOGE(BT_APP_CORE_TAG, "Failed to open file for reading");
        return;
    }
    else{
        while (!feof(fd)) // to read file
        {
            int n = fread(snd_buff, 1, BLOCK_SIZE, fd);
            ESP_LOGI(BT_APP_CORE_TAG, "%d bytes read and written %02x,%02x", n, ((uint16_t*)snd_buff)[0], ((uint16_t*)snd_buff)[1]);
        }
        fclose(fd);
    }

    // All done, unmount partition and disable SPIFFS
    esp_vfs_spiffs_unregister(conf.partition_label);
    ESP_LOGI(BT_APP_CORE_TAG, "SPIFFS unmounted");

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    ESP_LOGI(BT_APP_CORE_TAG, "Opening file %s", filename);
    FILE* fd = fopen(filename, "r");
    if (fd == NULL) {
        ESP_LOGE(BT_APP_CORE_TAG, "Failed to open file for reading");
        return;
    }
    else {
        ESP_LOGI(BT_APP_CORE_TAG, "%s was opened FD = %p", filename, fd);
        while (!feof(fd)) // to read file
        {
            int n = fread(snd_buff, BLOCK_SIZE, 1, fd);
            ESP_LOGI(BT_APP_CORE_TAG, "%d bytes read 0x%02x,0x%02x", n, ((uint16_t*)snd_buff)[0], ((uint16_t*)snd_buff)[1]);
        }
        fclose(fd);
    }

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fread(snd_buff, 1, BLOCK_SIZE, fd);