Jonathan BennettandClaude Opus 5.5 48d812536d LR20x0: empty the RX FIFO when a frame is dropped unread ...

The LR2021 receives into a FIFO that RadioLib empties only at the end of
readData(). Every path that gives up on a frame without reading it (the readout
task's bad length and full ring, the thread's early outs) cleared only the IRQ
flags, so the dropped frame's bytes stayed at the front of the FIFO and the next
frame was read out on top of them. On an X1, 37 of 37 forced drops were followed
by a "Decryptable packet failed decoding", so each drop cost two frames.

clearReadIrqs(), which every such path already calls, now also asks the driver
to discard the frame. LR20x0 sends CLEAR_RX_FIFO (private in RadioLib); the
other chips read from a buffer offset and need nothing.

Co-Authored-By: Jonathan Bennett <jbennett@incomsystems.biz>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01REkPVFh6kvG4AZJ5A8AtM9

2026-10-10 10:15:21 -05:00

..

test_main.cpp

LR20x0: empty the RX FIFO when a frame is dropped unread

2026-10-10 10:15:21 -05:00