How to configure external real time clock with seed xiao ble nrf52840

RE: How to configure external real time clock with seed xiao ble nrf52840

Einar Thorsrud — Wed, 03 Apr 2024 06:43:13 GMT

Hi,

I have not been able to find any existing drivers for max31341 for Zephyr, so you will have to write that yourself. You could choose to do it using the Zephyr drive rmodel, but if you just want something working for your specific device, it may be faster to use the nrfx drivers directly, for instnace as shown in this sample. You will need to look into the datasheet of the max31341 to see how to use it, and you can also look at (and perhaps re-use parts of) existing drivers for other platforms, like this one.

RE: How to configure external real time clock with seed xiao ble nrf52840

Jack sp — Wed, 03 Apr 2024 04:01:43 GMT

hello,
Thanks for reply,
i ask for external real time clock device. For that now i used the max31341B rtc device.And i use i2c communication protocol for communicate.
so my questiion is how to i get driver of external rtc max 31341B for programming in seed xiao ble nrf52840. And how to setup the prj.conf , cmake and overlay file.

RE: How to configure external real time clock with seed xiao ble nrf52840

Einar Thorsrud — Tue, 02 Apr 2024 12:29:11 GMT

Hi,

Do you mean an external 32.768 kHz oscillator (that is used as a reference for the internal RTC), or an external RTC device? If the latter, which RTC device is it and how to you communiate with it)?