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- adds API for retrieving & setting the ephemeral key. This is a key that is erased by a power-on reset, but is preserved between deep-sleep sleep/wake cycles. It is intended for securing a lock PIN, and can be up to 192 bits long. - adds API for checking the warm boot flags, which are also stored in the backup registers.
occassionally the hardware block just goes unresponsive. the 'fix' is to reset it, and then re-initialize the interface. I suspect this has to do with the UDMA silently dropping transactions when there's too much contention on the bus.
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Add:
Fix:
Suspected root cause is a similar issue to the
backpressurebug that affects the SPIM block when talking to SPI flash, but manifesting in a different form. I checked and this is using the backpressure flag, but backpressure only affects the Rx path. I seem to remember that only affected the Rx-side, but...clearly there is something else going on.