[GitHub] [mynewt-core] kasjer opened a new pull request #2096: sys/log: Add persistent log index

[GitBox <gi...@apache.org>]

kasjer opened a new pull request #2096: sys/log: Add persistent log index
URL: https://github.com/apache/mynewt-core/pull/2096
 
 
   It may be useful to keep log index even if after factory reset.
   
   On startup:
   A. (As usual) Firmware scans all persistent logs to determine the next available index.
   B. Firmware reads the persistent_index value from flash, if available.
   C. The next_index RAM variable is set to the greater of these two values.
   
   On each log write:
   1. Compare the next_index variable to persistent_index.
   2. If the difference is less than 500, schedule an event to write a new persistent_index to flash.
   3. The new persistent_index is equal to: next_index + 1000.
   
   Note 1: the numbers 500 and 1000 were chosen arbitrarily.
   Note 2: In step 2, the new persistent_index is written asynchronously because the logging task might not tolerate the time required to write to flash (e.g., ble_ll task).

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