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nRFX v2.0.0 NRFX_SWI_USED -> NRFX_EGUS_USED?

Hello, and thank you for making the nRFX components open-source on GitHub!

Now I realize that it's only been up for a day :smile: but most of the changes are reasonably self-explanitory.

The only thing I am asking for confirmation on is the dropping of the SWI driver and it's replacement with the EGU driver.

Is it correct to suppose that NRFX_SWI_USED has been effectively "renamed" to NRFX_EGUS_USED (with value 0x3C for SoftDevices 7.0.1)?

For NRFX_PPI_CHANNELS_USED, NRFX_PPI_GROUPS_USED, and NRFX_TIMERS_USED I can look at the "SoftDevice Specification" and rationalize those values with the ones found in "nrf_sd_def.h".

But the derivation (and correct value) of NRFX_EGUS_USED escapes me.

Thank you!
-Andrew.

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