uSDFS

uSD File system based on ELM-CHaN generic FAT system

The Teensy library contains a port of ELM_CHaN's generic FAT file system for the PJRC Teensy 3.5/6 and Teensy 4 MCU.

Examples

• uSDFS_test: basic test of uSD File system
• logger_RawWrite: testing writing to SD Cards

History:

- 18-feb-2023

• Version 1.1.4
  • upgraded to ELM-CHaN's ff15

- 23-may-2021

• Version 1.1.3
  • upgraded to ELM-CHaN's ff14b

- 09-aug-2020

• added example with fatfs=malloc(sizeof(FATFS)); (issue11)

- 01-july-2019

• Version 1.1.2
  • removed compatibility issues with TimeLib library

- 27-may-2019

• Version 1.1.1
  • added interface to GPT partitions (thanks to KurtE)

- 07-may-2019

• Version 1.1.0
  • upgraded to ELM-CHaN's ff13c
  • refactored library structure
  • added Teensy 4 low-level interface
  • added MSC (USB disk) interface
    • uses UHSHost_t36 (Teensy build-in library)
    • needs MSC library (https://forum.pjrc.com/threads/55821-USBHost_t36-USB-Mass-Storage-Driver-Experiments)

- 12-mar-2018

• Version 1.0.6
  • upgraded to ELM-CHaN's ff13a

- 03-may-2017

• Version 1.0.5
  • upgraded to ELM-CHaN's ff12c

- 29-oct-2106

• work in progress to stabilize use of multi-device settings (e.g. spi and sdhc)

- 26-oct-2016

• Version 1.0.4
  • added multi record operations for SPI (significant speed increase for large buffer read/write)
  • to be done
    • consolidations of SPI calls
    • variable speed settings for SPI (similar to begin/end transactions)
    • DMA support for SPI

- 20-oct-2016

• Version 1.0.3
  • added basic SPI support (8/16 bit FIFO)
  • User should edit src/uSDconfig.h to configure multiple uSD cards for both SPI (all teensies) and 4-Bit SDIO (T3.5/3.6 only)
  • multiple disks (mix of spi and sdio) are possible
  • to be done:
    • multi record operations for SPI
    • variable speed settings for SPI (similar to begin/end transactions)
    • DMA support for SPI

- 21-sept-2016

• -fshort-wchar addition in boards.txt is NOT neeeded any more
• changing _T(x) macro to #define _T(x) u ## x in ff.h does the job (u compiler directive indicate 16 bit)

- 12-sept-2016

• Version 1.0.2
  • upgraded to ELM-CHaN's ff12b
  • cleaned sdio.c
  • added cmd6 switch for high speed sdio
  • needs -fshort-wchar in boards.txt added to teensy36.build.flags.common for exFAT operation

- 09-aug-2016

• symbols aligned with Teensyduino_1.29

- 25-jul-2016

• upgraded to CHaN's ff12a version as of 25-July
• default configuration is now with exFAT
  • implies use of LFN
  • requires use of unicode

- 13-jul-2016

• corrected unicode char width (is 32 bit not 16 bit on FRDM K64, not sure for Teensy 3.6)

- 08-july-2016

• Working release

- 30-jun-2016

• First release V1.0.0
  • multi-buffer operation fixed

- 27-jun-2016

• work-around to get f_read/f_write working with buffer sizes >= 1024 bytes

- 26-jun-2016:

• Initial upload (K66 4-Bit SDIO)
• No speed optimization in FAT system