From a0c43a469239ab6fedaaa101b15bc6cc9e8baa1d Mon Sep 17 00:00:00 2001 From: Paulo Miguel Almeida Date: Fri, 31 Dec 2021 13:19:33 +1300 Subject: staging: pi433: add docs to packet_format and tx_start_condition enum While pi433 driver deals with the nuances of the different possible config combinations, it's hard (at first) to understand the rationale for some of the tx/rx-related source code unless you're fairly familiar with the rf69's inner workings. This patch documents the expected behaviour and limits of both packet_format and tx_start_condition enum fields. Signed-off-by: Paulo Miguel Almeida Link: https://lore.kernel.org/r/20211231001933.GA6779@mail.google.com Signed-off-by: Greg Kroah-Hartman --- drivers/staging/pi433/rf69_enum.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'drivers/staging') diff --git a/drivers/staging/pi433/rf69_enum.h b/drivers/staging/pi433/rf69_enum.h index fbf56fcf5fe8..b33a33a85d3b 100644 --- a/drivers/staging/pi433/rf69_enum.h +++ b/drivers/staging/pi433/rf69_enum.h @@ -110,12 +110,24 @@ enum fifo_fill_condition { }; enum packet_format { + /* + * Used when the size of payload is fixed in advance. This mode of + * operation may be of interest to minimize RF overhead by 1 byte as + * no length byte field is required + */ packet_length_fix, + /* + * Used when the size of payload isn't known in advance. It requires the + * transmitter to send the length byte in each packet so the receiver + * would know how to operate properly + */ packet_length_var }; enum tx_start_condition { + /* the number of bytes in the FIFO exceeds FIFO_THRESHOLD */ fifo_level, + /* at least one byte in the FIFO */ fifo_not_empty }; -- cgit v1.2.3