emFile is a fail-safe filesystem designed for embedded systems by SEGGER Microcontroller GmbH that can be used with different types of storage devices. It is a high-performance library optimized for high speed, versatility, and a minimal memory footprint of both RAM and Flash.

Cypress has licensed emFile from SEGGER and offers it for free to its customers. This middleware library provides emFile in the form of pre-built libraries and supports FAT 12/16/32 file systems.

Important Notice Regarding Long File Names (LFN): If you configure the software to support long file names on FAT file systems, you should determine whether a license from Microsoft is required. Cypress and its suppliers grant no license under Microsoft's intellectual property rights and assume no liability for any use of the software without obtaining any license that may be required.

• SEGGER emFile library v5.6.1

• Supports FAT 12/16/32 file systems

• Supports Long File Name (LFN)

• Cache support via RAM for optimized performance

• Supports fail-safety through the Journaling component

• Supports encryption: DES (56-bit key length)

• Supports thread safety for use with multi-threaded RTOS environments using the abstraction-rtos library

• Supports memory card devices such as MMC, SD, SDHC, and eMMC using SD bus mode (card mode)

  • The SD/MMC HW layer uses DMA and waits on a semaphore until data transfer completes when enabled

  • The SD/MMC driver supports up to 2 instances (FS_MMC_NUM_UNITS=2)

• Supports Single-SPI/Dual-DSPI/Quad-SPI based NOR flash memories

• Supports wear leveling for use with NOR flash memories

See the Quick Start section in the emFile Middleware User Guide or see the mtb-example-psoc6-filesystem-emfile-freertos code example that shows implementing emFile filesystem on SD card.

When used in an RTOS environment, add COMPONENTS=RTOS_AWARE in the Makefile to enable waiting on a semaphore until read/write transfer completes. You need to also add FREERTOS to the components list if you are using FreeRTOS.

• abstraction-rtos library if RTOS support (COMPONENTS=RTOS_AWARE) is required

  Note: abstraction-rtos is automatically pulled in when you add FreeRTOS using the Library Manager; otherwise, you need to add it manually.

• GNU Arm® Embedded Compiler v10.3.1 (GCC_ARM)

• Arm compiler v6.16 (ARM)

• IAR C/C++ compiler v9.30.1 (IAR)

• All PSoC™ 6 MCUs

• emFile Middleware User Guide

• SEGGER emFile User Guide

• Release Notes

• mtb-example-psoc6-filesystem-emfile-freertos code example

• Infineon GitHub

• ModusToolbox™ software

• PSoC 6 MCU Code Examples using ModusToolbox

• PSoC 6 MCU Middleware

• PSoC 6 MCU Resources - KBA223067

© 2021-2023 Cypress Semiconductor Corporation, an Infineon Technologies Company.