[op25-dev] problem using yank()

Matt D md123 at nycap.rr.com
Wed Dec 4 13:22:28 UTC 2013


I am trying to get the 240 Link Control Word bits out of the LDU1 frame
using this:

void
ldu1::decode_lcw()
{
   const size_t LCW_BITS[] = {
      410,  411,  412,  413,  414,  415,  416,  417,  418,  419,
      420,  421,  422,  423,  424,  425,  426,  427,  428,  429,
      432,  433,  434,  435,  436,  437,  438,  439,  440,  441,
      442,  443,  444,  445,  446,  447,  448,  449,  450,  451,
      600,  601,  602,  603,  604,  605,  606,  607,  608,  609,
      610,  611,  612,  613,  614,  615,  616,  617,  618,  619,
      620,  621,  622,  623,  624,  625,  626,  627,  628,  629,
      630,  631,  632,  633,  634,  635,  636,  637,  638,  639,
      788,  789,  792,  793,  794,  795,  796,  797,  798,  799,
      800,  801,  802,  803,  804,  805,  806,  807,  808,  809,
      810,  811,  812,  813,  814,  815,  816,  817,  818,  819,
      820,  821,  822,  823,  824,  825,  826,  827,  828,  829,
      978,  979,  980,  981,  982,  983,  984,  985,  986,  987,
      988,  989,  990,  991,  992,  993,  994,  995,  996,  997,
      998,  999,  1000, 1001, 1002, 1003, 1004, 1005, 1008, 1009,
      1010, 1011, 1012, 1013, 1014, 1015, 1016, 1017, 1018, 1019,
      1168, 1169, 1170, 1171, 1172, 1173, 1174, 1175, 1176, 1177,
      1178, 1179, 1180, 1181, 1182, 1183, 1184, 1185, 1186, 1187,
      1188, 1189, 1190, 1191, 1192, 1193, 1194, 1195, 1196, 1197,
      1198, 1199, 1200, 1201, 1202, 1203, 1204, 1205, 1206, 1207,
      1356, 1357, 1358, 1359, 1360, 1361, 1362, 1363, 1364, 1365,
      1368, 1369, 1370, 1371, 1372, 1373, 1374, 1375, 1376, 1377,
      1378, 1379, 1380, 1381, 1382, 1383, 1384, 1385, 1386, 1387,
      1388, 1389, 1390, 1391, 1392, 1393, 1394, 1395, 1396, 1397,
   };
   int * encoded_lcw = new int[240];
   yank(frame_body(), LCW_BITS, 240, encoded_lcw, 0);
   correct_lcw( encoded_lcw );
   delete [] encoded_lcw;
}

What am I doing wrong here?   the output is obviously wrong:

  LDU1 LCW Data--------------------------------------------
-----------------------------------------------------------
Encoded LCW:
  LCF:  00111011
  MFID: 00110000
  TGID: 0000000100000000
  Source ID: 000100000000000001000100

  Hamming decode:
    LCF:  00111011
    MFID: 00110000
    TGID: 0000000000000000
    Source ID: 000000000000000000000000

    RS decode:
      LCF:  00111011
      MFID: 00110000
      TGID: 0000000000000000
      Source ID: 000000000000000000000000
------------------------------------------------------------

I am pretty sure there is something wrong with how I am using the
yank(), but I have been able to find something else to try. Any help
will be much appreciated. Thanks.

-- 
------
Matt D
------------
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osmocom.org/pipermail/op25-dev/attachments/20131204/209e540f/attachment.html>


More information about the op25-dev mailing list