Initial commit

YSFEcho.cpp

@@ -0,0 +1,85 @@
+/*
+ *   Copyright (C) 2015 by Jonathan Naylor G4KLX
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "YSFEcho.h"
+
+#include "YSFDefines.h"
+
+CYSFEcho::CYSFEcho(unsigned int delay, unsigned int space) :
+m_buffer(space),
+m_timer(1000U, delay)
+{
+}
+
+CYSFEcho::~CYSFEcho()
+{
+}
+
+unsigned int CYSFEcho::readData(unsigned char* data)
+{
+	if (!hasData())
+		return 0U;
+
+	unsigned char len;
+	m_buffer.getData(&len, 1U);
+
+	m_buffer.getData(data, len);
+
+	// If the FICH is valid, regenerate the sync
+	if ((data[1U] & 0x01U) == 0x01U) {
+		data[2U] = YSF_SYNC_BYTES[0U];
+		data[3U] = YSF_SYNC_BYTES[1U];
+		data[4U] = YSF_SYNC_BYTES[2U];
+		data[5U] = YSF_SYNC_BYTES[3U];
+		data[6U] = YSF_SYNC_BYTES[4U];
+	}
+
+	if (!hasData())
+		m_timer.stop();
+
+	return len;
+}
+
+bool CYSFEcho::writeData(const unsigned char* data, unsigned int length)
+{
+	bool ret = m_buffer.hasSpace(length + 1U);
+	if (!ret)
+		return false;
+
+	unsigned char len = length;
+	m_buffer.addData(&len, 1U);
+
+	m_buffer.addData(data, length);
+
+	m_timer.start();
+
+	return true;
+}
+
+bool CYSFEcho::hasData()
+{
+	if (m_timer.isRunning() && m_timer.hasExpired())
+		return m_buffer.hasData();
+	else
+		return false;
+}
+
+void CYSFEcho::clock(unsigned int ms)
+{
+	m_timer.clock(ms);
+}