1 files changed, 70 insertions, 0 deletions
diff --git a/src/freedv_data_channel.h b/src/freedv_data_channel.h
new file mode 100644
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+++ b/src/freedv_data_channel.h
@@ -0,0 +1,70 @@
+/*---------------------------------------------------------------------------*\
+
+  FILE........: freedv_data_channel.h
+  AUTHOR......: Jeroen Vreeken
+  DATE CREATED: 03 March 2016
+
+  Data channel for ethernet like packets in freedv VHF frames.
+  Currently designed for-
+  * 2 control bits per frame
+  * 4 byte counter bits per frame
+  * 64 bits of data per frame
+\*---------------------------------------------------------------------------*/
+
+/*
+  Copyright (C) 2016 Jeroen Vreeken
+
+  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/>.
+*/
+
+#ifndef _FREEDV_DATA_CHANNEL_H
+#define _FREEDV_DATA_CHANNEL_H
+
+#include <stdlib.h>
+
+#define FREEDV_DATA_CHANNEL_PACKET_MAX 2048
+
+typedef void (*freedv_data_callback_rx)(void *, unsigned char *packet, size_t size);
+typedef void (*freedv_data_callback_tx)(void *, unsigned char *packet, size_t *size);
+
+struct freedv_data_channel {
+    freedv_data_callback_rx cb_rx;
+    void *cb_rx_state;
+     freedv_data_callback_tx cb_tx;
+    void *cb_tx_state;
+   
+    unsigned char rx_header[8];
+    unsigned char packet_rx[FREEDV_DATA_CHANNEL_PACKET_MAX + 2];
+    int packet_rx_cnt;
+    
+    unsigned char tx_header[8];
+    unsigned char packet_tx[FREEDV_DATA_CHANNEL_PACKET_MAX + 2];
+    int packet_tx_cnt;
+    size_t packet_tx_size;
+};
+
+
+struct freedv_data_channel *freedv_data_channel_create(void);
+void freedv_data_channel_destroy(struct freedv_data_channel *fdc);
+
+void freedv_data_set_cb_rx(struct freedv_data_channel *fdc, freedv_data_callback_rx cb, void *state);
+void freedv_data_set_cb_tx(struct freedv_data_channel *fdc, freedv_data_callback_tx cb, void *state);
+
+void freedv_data_channel_rx_frame(struct freedv_data_channel *fdc, unsigned char *data, size_t size, int from_bit, int bcast_bit, int crc_bit, int end_bits);
+void freedv_data_channel_tx_frame(struct freedv_data_channel *fdc, unsigned char *data, size_t size, int *from_bit, int *bcast_bit, int *crc_bit, int *end_bits);
+
+void freedv_data_set_header(struct freedv_data_channel *fdc, unsigned char *header);
+int freedv_data_get_n_tx_frames(struct freedv_data_channel *fdc, size_t size);
+
+#endif /* _FREEDV_DATA_CHANNEL_H */