Examples/Storage: provide sufficient timeout for SD card formatting

Large SD cards (16GB+) require significant amount of time for FS formatting.
Added FS mount checkpoint in example test python, timeout set to 60 sec

Closes IDFCI-706

examples/storage/sd_card/main/sd_card_example_main.c

@@ -75,7 +75,7 @@ void app_main(void)
         .max_files = 5,
         .allocation_unit_size = 16 * 1024
     };
-    sdmmc_card_t* card;
+    sdmmc_card_t *card;
     const char mount_point[] = MOUNT_POINT;
     ESP_LOGI(TAG, "Initializing SD card");
 
@@ -103,6 +103,7 @@ void app_main(void)
     gpio_set_pull_mode(12, GPIO_PULLUP_ONLY);   // D2, needed in 4-line mode only
     gpio_set_pull_mode(13, GPIO_PULLUP_ONLY);   // D3, needed in 4- and 1-line modes
 
+    ESP_LOGI(TAG, "Mounting filesystem");
     ret = esp_vfs_fat_sdmmc_mount(mount_point, &host, &slot_config, &mount_config, &card);
 #else
     ESP_LOGI(TAG, "Using SPI peripheral");
@@ -134,13 +135,14 @@ void app_main(void)
     if (ret != ESP_OK) {
         if (ret == ESP_FAIL) {
             ESP_LOGE(TAG, "Failed to mount filesystem. "
-                "If you want the card to be formatted, set the EXAMPLE_FORMAT_IF_MOUNT_FAILED menuconfig option.");
+                     "If you want the card to be formatted, set the EXAMPLE_FORMAT_IF_MOUNT_FAILED menuconfig option.");
         } else {
             ESP_LOGE(TAG, "Failed to initialize the card (%s). "
-                "Make sure SD card lines have pull-up resistors in place.", esp_err_to_name(ret));
+                     "Make sure SD card lines have pull-up resistors in place.", esp_err_to_name(ret));
         }
         return;
     }
+    ESP_LOGI(TAG, "Filesystem mounted");
 
     // Card has been initialized, print its properties
     sdmmc_card_print_info(stdout, card);
@@ -148,7 +150,7 @@ void app_main(void)
     // Use POSIX and C standard library functions to work with files.
     // First create a file.
     ESP_LOGI(TAG, "Opening file");
-    FILE* f = fopen(MOUNT_POINT"/hello.txt", "w");
+    FILE *f = fopen(MOUNT_POINT"/hello.txt", "w");
     if (f == NULL) {
         ESP_LOGE(TAG, "Failed to open file for writing");
         return;
@@ -182,7 +184,7 @@ void app_main(void)
     fgets(line, sizeof(line), f);
     fclose(f);
     // strip newline
-    char* pos = strchr(line, '\n');
+    char *pos = strchr(line, '\n');
     if (pos) {
         *pos = '\0';
     }

examples/storage/sd_card/sd_card_example_test.py

@@ -13,6 +13,9 @@ def test_examples_sd_card(env, extra_data):
     Utility.console_log('peripheral {} detected'.format(peripheral))
     assert peripheral in ('SDMMC', 'SPI')
 
+    # Provide enough time for possible SD card formatting
+    dut.expect('Filesystem mounted', timeout=60)
+
     # These lines are matched separately because of ASCII color codes in the output
     name = dut.expect(re.compile(r'Name: (\w+)'), timeout=5)[0]
     _type = dut.expect(re.compile(r'Type: (\S+)'), timeout=5)[0]