sdmmc: add an example communicating with eMMC chip on S3

examples/storage/emmc/pytest_emmc_example.py

@@ -0,0 +1,46 @@
+# SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Unlicense OR CC0-1.0
+
+
+import logging
+import re
+
+import pytest
+from pytest_embedded import Dut
+
+
+@pytest.mark.esp32s3
+@pytest.mark.emmc
+@pytest.mark.parametrize(
+    'config',
+    [
+        '1line',
+        '4line',
+        '8line',
+    ],
+    indirect=True,
+)
+def test_examples_sd_card_sdmmc(dut: Dut) -> None:
+    dut.expect('example: Initializing eMMC', timeout=20)
+    dut.expect('example: Using SDMMC peripheral', timeout=10)
+
+    # 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(rb'Name: (\w+)\r'), timeout=10).group(1).decode()
+    _type = dut.expect(re.compile(rb'Type: (\S+)'), timeout=10).group(1).decode()
+    speed = dut.expect(re.compile(rb'Speed: (\S+)'), timeout=10).group(1).decode()
+    size = dut.expect(re.compile(rb'Size: (\S+)'), timeout=10).group(1).decode()
+
+    logging.info('Card {} {} {}MHz {} found'.format(name, _type, speed, size))
+
+    message_list = ('Opening file /eMMC/hello.txt',
+                    'File written',
+                    'Renaming file /eMMC/hello.txt to /eMMC/foo.txt',
+                    'Reading file /eMMC/foo.txt',
+                    "Read from file: 'Hello {}!'".format(name),
+                    'Card unmounted')
+
+    for msg in message_list:
+        dut.expect(msg, timeout=10)