altos: Move FEC code to core

[fw/altos] / src / core / ao_fec.h

diff --git a/src/core/ao_fec.h b/src/core/ao_fec.h
new file mode 100644 (file)
index 0000000..db5523a
--- /dev/null
+++ b/src/core/ao_fec.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright © 2012 Keith Packard <keithp@keithp.com>
+ *
+ * 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; version 2 of the License.
+ *
+ * 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.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#ifndef _AO_FEC_H_
+#define _AO_FEC_H_
+
+#include <stdint.h>
+
+#define AO_FEC_CRC_INIT                        0xffff
+#define AO_FEC_TRELLIS_TERMINATOR      0x0b
+#define AO_FEC_PREPARE_EXTRA           4
+
+void
+ao_fec_dump_bytes(uint8_t *bytes, uint8_t len, char *name);
+
+uint16_t
+ao_fec_crc(uint8_t *bytes, uint8_t len);
+
+/*
+ * Append CRC and terminator bytes, returns resulting length.
+ * 'out' must be at least len + AO_FEC_PREPARE_EXTRA bytes long
+ */
+uint8_t
+ao_fec_prepare(uint8_t *in, uint8_t len, uint8_t *out);
+
+/*
+ * Whiten data using the cc1111 PN9 sequence. 'out'
+ * must be 'len' bytes long. 'out' and 'in' can be
+ * the same array
+ */
+uint8_t
+ao_fec_whiten(uint8_t *in, uint8_t len, uint8_t *out);
+
+/*
+ * Encode data. 'out' must be len*2 bytes long
+ */
+uint8_t
+ao_fec_encode(uint8_t *in, uint8_t len, uint8_t *out);
+
+/*
+ * Interleave data. 'out' must be 'len' bytes long
+ */
+uint8_t
+ao_fec_interleave(uint8_t *in, uint8_t len, uint8_t *out);
+
+#endif /* _AO_FEC_H_ */