SD Card filesystem access about sam32

[maholli]

mounting an SD card on the ESP32 (SAM32v1):

1. set SD_CS low in SAMD51 main.
2. enter the esp32 REPL prompt. Current (sketchy) method is using the attached main.py
   main.py.txt

import uos
uos.sdconfig(uos.SDMODE_SPI, clk=5, mosi=18, miso=19, cs=14, maxspeed=16)
import os
os.mountsd(True)
os.listdir('/sd')

REPL output should look something like this:

[maholli]

running files on ESP32 from SD card

1. Save desired file to sd card (externally)
2. boot with attached main.py main.py.txt
3. mount sd like so:
   
4. run os.getcwd() and make sure you're in /sd, otherwise do os.chdir('/sd')
5. now you you can do: import FILENAMEHERE.py