SAMD SPI issues

Hello.

I was working with SAMD SPI and noticed the SPI bus is really slow to init/de-init. So the transfer is actually fast & up to specs, but there are long spaces in between. The code is not using interrupts:


Can this be fixed?

Start by locating the SAMD SPI initialization and de-initialization code, then reproduce the timing shown in the issue to identify the source of the pauses between transfers. Done means reducing the initialization/de-initialization delays while preserving the reported transfer speed and verifying the behavior with a suitable SPI test.

Written by the indexing model from the issue text.