From 87e917264328af0ce022e69d72fda7652267e889 Mon Sep 17 00:00:00 2001
From: Jose Alamos <jose.alamos@haw-hamburg.de>
Date: Mon, 7 Jan 2019 17:10:42 +0100
Subject: [PATCH] drivers/cc2420: add datasheet documentation to duplicated
 strobe call

---
 drivers/cc2420/cc2420.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/cc2420/cc2420.c b/drivers/cc2420/cc2420.c
index d8e98fb18c..6fe3e764d8 100644
--- a/drivers/cc2420/cc2420.c
+++ b/drivers/cc2420/cc2420.c
@@ -160,6 +160,9 @@ void cc2420_tx_exec(cc2420_t *dev)
 
 static inline void _flush_rx_fifo(cc2420_t *dev)
 {
+    /* as stated in the CC2420 datasheet (section 14.3), the SFLUSHRX command
+     * strobe should be issued twice to ensure that the SFD pin goes back to its
+     * idle state */
     cc2420_strobe(dev, CC2420_STROBE_FLUSHRX);
     cc2420_strobe(dev, CC2420_STROBE_FLUSHRX);
 }