AJB2K3
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Micro SD cards with the M5StampS3

How to use Micro SD cards with the M5Stamp S3

IntermediateProtip1 hour222
Micro SD cards with the M5StampS3

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Code

Test code for reading and writing to SD cards.

MicroPython
import machine
from machine import Pin, SPI, SDCard
import os

sd = machine.SDCard(slot=2, width=1, cd=None, wp=None, sck=Pin(6), miso=Pin(4), mosi=Pin(5), cs=Pin(7), freq=10000000)

try:
    os.mount(sd, "/sd")
except:
    print("Failed to mount SD card”)


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 i 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")

with open('/sd/letters.txt', 'r') as file:
    data = file.read()
    print(data)

with open('/sd/letters.txt', 'w') as file:
    file.write("Hello, MicroPython!”)


os.umount(/sd")

Credits

AJB2K3

AJB2K3

48 projects • 29 followers
I have always had an interest in electronics but having failed my school exams, it has taken me 20+ years to produce products to share.

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