Merge pull request #5 from mrmcwethy/examples

Added examples folder and an example .py

adafruit_sdcard.py

@@ -337,6 +337,8 @@ def _write(self, token, buf, start=0, end=None):
             while cmd[0] == 0:
                 spi.readinto(cmd, end=1, write_value=0xff)
 
+        return 0 # worked
+
     def count(self):
         """Returns the total number of sectors.
 

examples/read_directory.py

@@ -0,0 +1,55 @@
+import os
+import busio
+import digitalio
+import board
+import storage
+import adafruit_sdcard
+
+# The SD_CS pin is the chip select line.
+#
+#     The Adalogger Featherwing with ESP8266 Feather, the SD CS pin is on board.D15
+#     The Adalogger Featherwing with Atmel M0 Feather, it's on board.D10
+#     The Adafruit Feather M0 Adalogger use board.SD_CS
+#     For the breakout boards use any pin that is not taken by SPI
+
+SD_CS = board.SD_CS # setup for M0 Adalogger; change as needed
+
+# Connect to the card and mount the filesystem.
+spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
+cs = digitalio.DigitalInOut(SD_CS)
+sdcard = adafruit_sdcard.SDCard(spi, cs)
+vfs = storage.VfsFat(sdcard)
+storage.mount(vfs, "/sd")
+
+# Use the filesystem as normal! Our files are under /sd
+
+# This helper function will print the contents of the 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) + " bytes"
+        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")