From 4ceee66c793a3cd59fb8a55522588832d74bf671 Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Sat, 26 Jan 2013 19:55:44 -0300
Subject: [PATCH] ubb-la/ubb-la.c (INITIAL_SKIP): describe how the value was
 obtained

---
 ubb-la/ubb-la.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ubb-la/ubb-la.c b/ubb-la/ubb-la.c
index c63a023..2dd147d 100644
--- a/ubb-la/ubb-la.c
+++ b/ubb-la/ubb-la.c
@@ -29,6 +29,13 @@
 
 #define	KEY_MASK	0x5fc0000
 
+/*
+ * The initial skip is for samples loaded into the FIFO when starting the
+ * command, before waiting for the trigger. A completely filled FIFO would
+ * hold 16 * 32 bits or 128 samples. In reality, we observe 122 samples for
+ * sample rates up to 24 MHz and 123 samples for 42 or 56 MHz.
+ */
+
 #define	INITIAL_SKIP	122	/* should be 123 for higher speeds */