redsea: data.cc:10: std::string redsea::getLCDchar(int): Assertion `code >= 32' failed.

[ghost]

I run readsea with the below command, any ideas what I'm doing wrong ?

$ date ; rtl_fm -M fm -f 88.5M -l 0 -A std -p 0 -s 228k -F 9 | ./redsea 2>&1  > /tmp/ram/redsea_88.5M.log.B.txt ; date
Tue Jul  5 13:02:27 UTC 2016
Found 1 device(s):
  0:  Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Tuner gain set to automatic.
Tuned to 88956000 Hz.
Oversampling input by: 8x.
Oversampling output by: 1x.
Buffer size: 4.49ms
Exact sample rate is: 1824000.017395 Hz
Sampling at 1824000 S/s.
Output at 228000 Hz.
redsea: data.cc:10: std::string redsea::getLCDchar(int): Assertion `code >= 32' failed.
Signal caught, exiting!

User cancel, exiting...
Aborted
Tue Jul  5 14:09:12 UTC 2016
$

---

It looks to happen at random times:

-rw-r--r--  1 mzs mzs   23356 Jun 30 03:50 redsea_88.5M.log.0.txt.xz
-rw-r--r--  1 mzs mzs    3764 Jun 30 10:12 redsea_88.5M.log.1.txt.xz
-rw-r--r--  1 mzs mzs    3208 Jul  1 01:19 redsea_88.5M.log.2.txt.xz
-rw-r--r--  1 mzs mzs    7864 Jul  1 17:29 redsea_88.5M.log.3.txt.xz
-rw-r--r--  1 mzs mzs    6364 Jul  1 22:57 redsea_88.5M.log.4.txt.xz
-rw-r--r--  1 mzs mzs   12092 Jul  2 03:36 redsea_88.5M.log.5.txt.xz
-rw-r--r--  1 mzs mzs    9040 Jul  2 10:46 redsea_88.5M.log.6.txt.xz
-rw-r--r--  1 mzs mzs   34284 Jul  2 22:57 redsea_88.5M.log.7.txt.xz
-rw-r--r--  1 mzs mzs   29644 Jul  3 12:02 redsea_88.5M.log.8.txt.xz
-rw-r--r--  1 mzs mzs   31604 Jul  4 00:14 redsea_88.5M.log.9.txt.xz
-rw-r--r--  1 mzs mzs   11460 Jul  5 04:00 redsea_88.5M.log.A.txt.xz
-rw-r--r--  1 mzs mzs    2136 Jul  5 14:09 redsea_88.5M.log.B.txt.xz

I do not think that I have managed to run it for 24 hours yet without it kicking up that message.

[windytan]

Hi! Thanks for your extensive testing!

You were doing nothing wrong; this is a legit bug. It should be fixed now.

[ghost]

Thanks for the fix, I think that the root of the problem is my reception, sometimes a bit or two is flipped the wrong way. See below:

$ xzcat *.xz | grep "ps" | grep -v alt_freqs | cut -c 82- | sed -e 's#\}##' | sort | uniq -c | sort -rn
    340 "ps":"RTE R1  "
      4 "ps":""
      1 "ps":"VVE R1  "
      1 "ps":"RTGŞR1  "
      1 "ps":"RTE Zå  "
      1 "ps":"RTE R1sæ"
      1 "ps":"RTE R1e"
      1 "ps":"RTE R1ª‖"
      1 "ps":"RTE R1 Å"
      1 "ps":"RTE R1,%"
      1 "ps":"RTE R;  "
      1 "ps":"RTE Qš  "
      1 "ps":"RTE q2  "
      1 "ps":"RTěǦR1  "
      1 "ps":"RTB0R1  "
      1 "ps":"RTAWR1  "
      1 "ps":"RT æR1  "
      1 "ps":"OæE R1  "
      1 "ps":"Õ4E R1  "
      1 "ps":"bTE R1  "
      1 "ps":"BRE R1  "

Your original code would work perfectly if only my RF reception was better :)

[windytan]

I think these could be mitigated by improving the error detection & correction (I've made an issue about it) and also implementing clock phase recovery, in the future.