This library contains micro-layer for Pico]OS.

Currently it contains:

• File system abstraction layer
• FAT filesystem from elm-chan.org
• ROM filesystem (can be flashed into MCU)
• MMC/SD card support (SPI mode)
• microsecond spin-wait function
• diagnostic functions about Pico]OS resource usage
• HAL stuff for msp430 5xx/6xx families (compiled only for msp430 port)

There is a spiffs addon in picoos-micro-spiffs library.

For more info, see this blog entry or manual.