Seeed ArduPy SD Card

Introduction

An ArduPy library for SD card. Mount a FAT formatted SD card in to the vFAT of Micropython. So that standard functions for read and write Data can be used. It uses an modyfied Seeed Arduino SD driver

How to binding with ArduPy

• Install AIP

pip3 install ardupy-aip

• Build firmware with Seeed ArduPy SD Card

aip install https://github.com/Crazyhackelkorn/seeed-ardupy-sdcard
aip build

• Flash new firmware to you ArduPy board

aip flash [Ardupy Bin PATH]

For more examples of using AIP, please refer to AIP.

Usage

Note: Tested code with Wio Terminal and an 32GB SanDisk microSDHC (FAT32)

import os
from arduino import sdcard
# from machine import Map

SD=sdcard()
# sdcard(64,Map.SPI2,5000000) # equal for Wio Terminal
os.mount(SD,'/sd')

with open('/sd/hello.txt', 'w') as f:
    f.write('Hello world')
	
print(open('/sd/hello.txt').read())

API Reference

• available(mode<char>) : bool - available

# simple attribute check
if SD.available():
    print(open('/sd/hello.txt').read())
	
# reinit SD card. Should detect ejected SD card.
if SD.available('f'):
    print(open('/sd/hello.txt').read())
else:
	os.umount('/sd')
	SD.umount()

• type : int - SD type

if SD.type == 0:
	print("No card")
elif SD.type == 1:
	print("MMC card")
elif SD.type == 2:
	print("SD card")
elif SD.type == 3:
	print("SDHC card")
elif SD.type == 4:
	print("Unknown card")

• size : int - SD physical size in KB

print (SD.size,"KB")

• umount(void) : void - deinit SD state, type, sector count

os.umount('/sd')
SD.umount() # isn't needed but so SD.type, SD.size and SD.available() return correct values.

Block Devise Functions

For more detail see uos.AbstractBlockDev

• readblocks(num<uint64>,buf<bytearray>) : void - reads raw data

b = bytearray(512) # one block is 512 Byte
SD.readblocks(0,b)
print(b)

• writeblocks(num<uint64>,buf<bytearray>) : void - writes raw data

Note: Don't do this

b = bytearray(512) # one block is 512 Byte
SD.writeblocks(0,b) #shouldn't be done
SD.readblocks(0,b)
print(b)

• ioctl(cmd<uint8>) : uint64 - additional io functions

SD.ioctl(1) # initialise the device / get device status
SD.ioctl(2) # deinitialise/shutdown the device
SD.ioctl(3) # sync the device
SD.ioctl(4) # get a count of the number of blocks
SD.ioctl(5) # get the number of bytes in a block

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License

This software is written by seeed studio
and is licensed under The MIT License. Check License.txt for more information.