initial pass at horus API function

git-svn-id: https://svn.code.sf.net/p/freetel/code@3414 01035d8c-6547-0410-b346-abe4f91aad63

diff --git a/codec2-dev/src/horus_api.h b/codec2-dev/src/horus_api.h
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+++ b/codec2-dev/src/horus_api.h
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+/*---------------------------------------------------------------------------*\
+
+  FILE........: horus_api.h
+  AUTHOR......: David Rowe
+  DATE CREATED: March 2018
+
+  Library of API functions that implement High Altitude Balloon (HAB)
+  telemetry modems and protocols.
+
+\*---------------------------------------------------------------------------*/
+
+/*
+  Copyright (C) 2018 David Rowe
+
+  All rights reserved.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License version 2.1, as
+  published by the Free Software Foundation.  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 Lesser General Public License
+  along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+#ifndef __HORUS_API__
+
+#define HORUS_MODE_RTTY        0
+#define HORUS_MODE_BINARY      1
+
+struct MODEM_STATS;
+
+struct horus *horus_open  (int mode);
+void          horus_close (struct horus *hstates);
+
+int           horus_nin   (struct horus *hstates);
+int           horus_rx    (struct horus *hstates, char telemetry_out[], short demod_in[]);
+
+int           horus_get_version              (void);
+int           horus_get_mode                 (struct horus *hstates);
+void          horus_get_modem_stats          (struct horus *hstates, int *sync, float *snr_est);
+void          horus_get_modem_extended_stats (struct horus *hstates, struct MODEM_STATS *stats);
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif