From df8148033a1f60400693e80c3732a43cc26e0ee2 Mon Sep 17 00:00:00 2001
From: Lorenz Meier <lm@inf.ethz.ch>
Date: Mon, 22 Oct 2012 08:14:43 +0200
Subject: Cleaned up calibration, added text messages ring buffer

---
 apps/mavlink/mavlink_log.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 apps/mavlink/mavlink_log.c

(limited to 'apps/mavlink/mavlink_log.c')

diff --git a/apps/mavlink/mavlink_log.c b/apps/mavlink/mavlink_log.c
new file mode 100644
index 000000000..660e282f8
--- /dev/null
+++ b/apps/mavlink/mavlink_log.c
@@ -0,0 +1,80 @@
+/****************************************************************************
+ *
+ *   Copyright (C) 2012 PX4 Development Team. All rights reserved.
+ *   Author: Lorenz Meier <lm@inf.ethz.ch>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name PX4 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 mavlink_log.c
+ * MAVLink text logging.
+ *
+ * @author Lorenz Meier <lm@inf.ethz.ch>
+ */
+
+#include <string.h>
+
+#include "mavlink_log.h"
+ 
+void mavlink_logbuffer_init(struct mavlink_logbuffer *lb, int size) {
+    lb->size  = size;
+    lb->start = 0;
+    lb->count = 0;
+    lb->elems = (struct mavlink_logmessage *)calloc(lb->size, sizeof(struct mavlink_logmessage));
+}
+ 
+int mavlink_logbuffer_is_full(struct mavlink_logbuffer *lb) {
+    return lb->count == lb->size;
+}
+ 
+int mavlink_logbuffer_is_empty(struct mavlink_logbuffer *lb) {
+    return lb->count == 0;
+}
+ 
+void mavlink_logbuffer_write(struct mavlink_logbuffer *lb, const struct mavlink_logmessage *elem) {
+    int end = (lb->start + lb->count) % lb->size;
+    memcpy(&(lb->elems[end]), elem, sizeof(struct mavlink_logmessage));
+    if (mavlink_logbuffer_is_full(lb)) {
+        lb->start = (lb->start + 1) % lb->size; /* full, overwrite */
+    } else {
+        ++lb->count;
+    }
+}
+ 
+int mavlink_logbuffer_read(struct mavlink_logbuffer *lb, struct mavlink_logmessage *elem) {
+    if (!mavlink_logbuffer_is_empty(lb)) {
+        memcpy(elem, &(lb->elems[lb->start]), sizeof(struct mavlink_logmessage));
+        lb->start = (lb->start + 1) % lb->size;
+        --lb->count;
+        return 0;
+    } else {
+        return 1;
+    }
+}
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