initial add - define board pins for SD Card and mount file system working for rp2350 and esp32 IOT RBs

Author: gigapod

examples/mpy_sdcard_log/mpy_sdcard_log.py

@@ -0,0 +1,53 @@
+
+
+import machine
+from machine import Pin, SPI
+import sdcard
+
+
+import os
+import uos
+import time
+
+# Define the boards we support with this deme - This is a dictionary the key being
+# the board uname.machine value, and value a tuple that contains SPI bus number and CS ping number.
+SupportedBoards = {
+    "SparkFun IoT RedBoard RP2350 with RP2350": (1, 9),
+    "SparkFun IoT RedBoard ESP32 with ESP32": (2, 5)
+}
+
+
+def mount_sd_card():
+
+    # is this a supported board?
+    board_name = os.uname().machine
+    if board_name not in SupportedBoards:
+        print("This board is not supported")
+        return False
+
+    # Get the SPI bus and CS pin for this board
+    spi_bus, cs_pin = SupportedBoards[board_name]
+
+    # Create the SPI object
+    spi = SPI(spi_bus, baudrate=1000000, polarity=0, phase=0)
+    # Create the CS pin object
+    cs = Pin(cs_pin, Pin.OUT)
+
+    # Create the SD card object
+    try:
+        sd = sdcard.SDCard(spi, cs)
+    except Exception as e:
+        print("[Error] ", e)
+        return False
+
+    # Mount the SD card
+    try:
+        vfs = uos.VfsFat(sd)
+        uos.mount(vfs, "/sd")
+    except Exception as e:
+        print("[Error] Failed to mount the SD Card", e)
+        return False
+
+    print("SD Card mounted successfully")
+
+    return True