Alfonso Acosta

I am trying to connect my S3 (Seeed Xiao S3 board) to an external oscillator but the obtained frequency isn't stable. I have connected the XTAL_32K_P pin to the 32768...

I have tried setting `RTC_CNTL_RTC_XTAL32K_GPIO_SEL` to 1 but it doesn't help (I get the infamous `32 kHz XTAL not found` message at boot)

BTW, this is the oscillator signal I am using as input. (Using a 10x probe)  Uhm, I am thinking that it may not be following `0.6 < Vpp <...

> sometimes 141495 Hz (I guess it's because the XTAL32K Watchdog Timer kicks in?). That can't be, since [CONFIG_ESP_XT_WDT](https://docs.espressif.com/projects/esp-idf/en/stable/esp32s3/api-reference/kconfig.html#config-esp-xt-wdt) isn't enabled in my project

@igrr could you please shed some light here? (or point us to someone who may know?) Maybe @esp-momo ? Or @krzychb ?

It seems to work after doing `REG_SET_FIELD(RTC_CNTL_EXT_XTL_CONF_REG, RTC_CNTL_DBUF_XTAL_32K, 0)` I still haven't tested it long-term but so far I always get calibrations of 32767 Hz! PR coming up.

My guess is we would need to: 1. Use something like https://github.com/notify-rs/notify to monitor the config file for changes. 2. Modify the [config cell implementation](https://github.com/iqlusioninc/abscissa/blob/main/core/src/config/cell.rs) so that `set_once()` can actually...