From e6d236fdc615625fbbf28377453f920729e49b0f Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Sun, 17 Jun 2012 16:17:00 -0700 Subject: altos: Software implemenation of CC1111 radio encoding Add CRC, whitening, FEC and interleaving routines for transmission path to allow cc1120 to send telem packets to cc1111. Signed-off-by: Keith Packard --- src/util/make-whiten | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 src/util/make-whiten (limited to 'src/util/make-whiten') diff --git a/src/util/make-whiten b/src/util/make-whiten new file mode 100644 index 00000000..d68a02af --- /dev/null +++ b/src/util/make-whiten @@ -0,0 +1,37 @@ +/* + * Copyright © 2012 Keith Packard + * + * 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. + */ + +/* Generate the data whitening array used by the CC11* radios */ + +int pn9 = 0x1ff; + +void +pn9_step() { + pn9 = (pn9 >> 1) | (((pn9 ^ (pn9 >> 5)) & 1) << 8); +} + +int val() +{ + int ret = pn9 & 0xff; + + for (int i = 0; i < 8; i++) + pn9_step(); + return ret; +} + +for (int i = 0; i < 128; i++) + printf (" /* %3d */ 0x%02x,\n", i + 1, val()); -- cgit v1.2.3