Add README

[rgblamp.git] / lfsr.c

diff --git a/lfsr.c b/lfsr.c
index e2539d8286bb67a77a8358e28c4e3a5db1f81aec..df1fe31e796fd05f44fde1e1466fdef89a841f34 100644 (file)
--- a/lfsr.c
+++ b/lfsr.c
@@ -1,3 +1,32 @@
+/*
+ * Copyright © 2011, 2012, Titanium Mirror, Inc..
+ * All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - Neither the name of Titanium Mirror, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
 /*
  * File:   lfsr.c
  *
@@ -8,13 +37,7 @@
  * This is a small, fast and efficient software implementation of a 16-bit
  * Linear Feedback Shift Register (LFSR).  It uses the Galois method to perform
  * the exclusive OR operations in parallel for improved performance over the
- * standard, or Fibonacci, method.  The algorithm also skips the exlusive or
- * operations if it doesn't need to do them, though on this uC the branch may
- * not generate a net performance increase over doing the exclusive or
- * operations every time.
- *
- * After rng returns, RNGLO and RNGHI contain the updated 16-bit random number.
- * RNGLO will contain a value $01-$FF, RNGHI will contain $00-$FF.
+ * standard, or Fibonacci, method.
  *
  * @author R. Steve McKown <rsmckown@gmail.com>
  */