Hi @Gianfry60 @Baozhu,
Porting the ESP code may work but a lot of work. There is a library called rtczero on the Arduino website that enables the use of the internal rtc on ATMEL M0 based boards i.e. Arduino Zero. This library will not compile on the Wio Terminal which based on the ATMEL M4 chips. When I looked at the code the rtczero library should be able to be ported for use on the Wio Terminal as it looks like the major issue is the registers naming used in the M4 chips.
@Baozhu Would the Seeed team be interested in porting the rtczero library for use on the Wio Terminal? It would be a useful additional base library for use on Wio Terminal.
Regards,
Jim