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Improve diagnostics for when closing the loop does not work, or for when the loop opens itself

Jeroen Hegeman requested to merge jhegeman/tclink:improve_diagnostics_closing_loop into master

The TCLink loop can open itself for various reasons. The current implementation does not provide any diagnostics for why the loop opened though.

This merge request brings a new signal out of the tclink_lpgbt component that indicates the reason the loop is not closed, in the form of a latched value indicating the cause at the time the loop opened:

  • Bit-0: User opened loop.
  • Bit-1: TX not ready.
  • Bit-2: RX not ready.
  • Bit-3: Lower phase limit exceeded.
  • Bit-4: Upper phase limit exceeded.

The same functionality is provided in cases where the loop cannot be closed, but a rising edge of close_loop_i is detected.

Edited by Jeroen Hegeman

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