handle SAMD51 caches - Githubissues

cmaglie / FlashStorage

A convenient way to store data into Flash memory on the ATSAMD21 and ATSAMD51 processor family

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handle SAMD51 caches #38

Closed dhalbert closed 4 years ago

dhalbert commented 4 years ago

Fixes #37 and cache issues noted in #27.

Temporarily disable NVMCTRL line caches when writing, per SAMD51 errata. Restore them to original settings when done.
Invalidate CMCC cache after writing if it was in use .

Tested on an early SAMD51, which might have been more likely to have the cache issues. Without the CMCC invalidation, the test program in #27 returned incorrect results, as noted by some commenters in that issue.

dhalbert commented 4 years ago

Tagging @mitchellpontague for a look.