RE: Zephyr and nrf52840 capabilities

Raoul — Tue, 21 Mar 2023 14:07:24 GMT

Hi,

When using an SD card you'll be using a file system such as LittleFS or FATFS. Zephyr provides the file system API as an abstraction for these. It includes the fs_statvfs() function, which "returns the total and available space in the file system volume".

Regarding the LSM6DS3, Zephyr doesn't have a fully fledged driver for this sensor but it does have something you could build on. See RE: LSM6DS33 to work with LSM6DSO driver

Unfortunately the RTC is disabled when going into System Off. Just like with other devices, the nRF52840's clocks are powered down when going into system off, so running the RTC isn't possible. However, the nRF52840 can wake from system off based on a handful of signals, so you could equip your board with an external RTC and use that to wake the MCU, probably using the DETECT signal.

Best regards,

Raoul