New files for guide

CircuitPython_sdcardio_sdioio/list_files.py

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+import os
+
+import mount_sd
+
+def print_directory(path, tabs=0):
+    for file in os.listdir(path):
+        stats = os.stat(path + "/" + file)
+        filesize = stats[6]
+        isdir = stats[0] & 0x4000
+
+        if filesize < 1000:
+            sizestr = str(filesize) + " by"
+        elif filesize < 1000000:
+            sizestr = "%0.1f KB" % (filesize / 1000)
+        else:
+            sizestr = "%0.1f MB" % (filesize / 1000000)
+
+        prettyprintname = ""
+        for _ in range(tabs):
+            prettyprintname += "   "
+        prettyprintname += file
+        if isdir:
+            prettyprintname += "/"
+        print('{0:<40} Size: {1:>10}'.format(prettyprintname, sizestr))
+
+        # recursively print directory contents
+        if isdir:
+            print_directory(path + "/" + file, tabs + 1)
+
+
+print("Files on filesystem:")
+print("====================")
+print_directory("/sd")

CircuitPython_sdcardio_sdioio/log_temperature.py

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+import time
+
+import board
+import digitalio
+import microcontroller
+import mount_sd
+
+led = digitalio.DigitalInOut(board.D13)
+led.direction = digitalio.Direction.OUTPUT
+
+# Use the filesystem as normal! Our files are under /sd
+
+print("Logging temperature to filesystem")
+# append to the file!
+while True:
+    # open file for append
+    with open("/sd/temperature.txt", "a") as f:
+        led.value = True  # turn on LED to indicate we're writing to the file
+        t = microcontroller.cpu.temperature
+        print("Temperature = %0.1f" % t)
+        f.write("%0.1f\n" % t)
+        led.value = False  # turn off LED to indicate we're done
+    # file is saved
+    time.sleep(1)

CircuitPython_sdcardio_sdioio/play_mp3s.py

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+import os
+import time
+
+import board
+import digitalio
+import mount_sd
+
+# Updating the display can interfere with MP3 playback if it is not
+# done carefully
+try:
+    board.DISPLAY.auto_refresh = False
+except:
+    pass
+
+from audiomp3 import MP3Decoder
+
+try:
+    from audioio import AudioOut
+except ImportError:
+    try:
+        from audiopwmio import PWMAudioOut as AudioOut
+    except ImportError:
+        pass  # not always supported by every board!
+
+# The mp3 files on the sd card will be played in alphabetical order
+mp3files = sorted("/sd/" + filename for filename in os.listdir("/sd")
+    if filename.lower().endswith("mp3"))
+
+voodoo = [1,2,3]
+
+# You have to specify some mp3 file when creating the decoder
+mp3 = open(mp3files[0], "rb")
+decoder = MP3Decoder(mp3)
+audio = AudioOut(board.A0, right_channel=board.A1)
+
+speaker_enable = digitalio.DigitalInOut(board.SPEAKER_ENABLE)
+speaker_enable.switch_to_output(True)
+
+while True:
+    for filename in mp3files:
+        print("Playing", filename)
+
+        # Updating the .file property of the existing decoder
+        # helps avoid running out of memory (MemoryError exception)
+        decoder.file = open(filename, "rb")
+        audio.play(decoder)
+
+        # This allows you to do other things while the audio plays!
+        while audio.playing:
+            time.sleep(1)

CircuitPython_sdcardio_sdioio/show_bitmaps.py

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+import os
+import time
+
+import board
+import digitalio
+import displayio
+import mount_sd
+
+display = board.DISPLAY
+
+# The bmp files on the sd card will be shown in alphabetical order
+bmpfiles = sorted("/sd/" + filename for filename in os.listdir("/sd")
+    if filename.lower().endswith("bmp"))
+
+while True:
+    for filename in bmpfiles:
+        print("showing", filename)
+
+        bitmap_file = open(filename, "rb")
+        bitmap = displayio.OnDiskBitmap(bitmap_file)
+        tile_grid = displayio.TileGrid(bitmap,
+            pixel_shader=displayio.ColorConverter())
+        group = displayio.Group()
+        group.append(tile_grid)
+        display.show(group)
+
+        # Show the image for 10 seconds
+        time.sleep(10)