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237 Commits

Author SHA1 Message Date
Jared Boone
096ebe47d8 Turn almost-zeros in TPMS matched filter to actual zeros. 2016-01-02 10:24:49 -08:00
Jared Boone
0e04939439 Broadcast FM de-emphasis using 75us time constant. 2016-01-01 20:56:30 -08:00
Jared Boone
2e90edbf39 Add 30Hz high-pass IIR filter for wideband FM. 2016-01-01 20:55:00 -08:00
Jared Boone
9a0fb2cab7 Rename IIR filter for 300Hz high-pass. 2016-01-01 20:53:11 -08:00
Jared Boone
ff05833b02 Use new decimation filters in AIS processor. 2016-01-01 13:20:02 -08:00
Jared Boone
316d5d433b Move IIR code into .cpp file. 
A few hundred more text section bytes saved.
 2015-12-31 10:52:28 -08:00
Jared Boone
9fb22dfd1f Reduce type size for int16_t squared values. 2015-12-31 10:09:42 -08:00
Jared Boone
ef37bbd851 Small FM squelch simplification. 2015-12-31 10:08:41 -08:00
Jared Boone
0962343190 Use decimation variable, not hard-coded value. 
Break in form from NBFM code.
 2015-12-30 12:20:25 -08:00
Jared Boone
7de80edcd3 Move baseband FIR filter defs to common file. 
They will likely be shared with multiple decimators/demodulators.
Also added normalized filter pass/stop values to each set of taps.
 2015-12-30 12:19:42 -08:00
Jared Boone
bbfcca8ec0 Rebake of AM, NFM demodulators -- more flexible filtering/configuration. 
Also make SpectrumCollector dynamically configurable.
Add deemphasis filter to NFM.
 2015-12-29 11:02:07 -08:00
Jared Boone
549e5b9ddc Unrolled FIR filters for more flexible baseband filtering (using IFIR technique). 2015-12-29 10:48:29 -08:00
Jared Boone
8453741252 Saturate IIR filter output to int16_t. 2015-12-28 16:33:26 -08:00
Jared Boone
7ec1a1f85b Move comment about FM squelch IIR filter. 2015-12-28 16:24:43 -08:00
Jared Boone
ef7aeaafa9 Tweak (and document!) audio HPF IIR. 2015-12-28 16:01:26 -08:00
Jared Boone
4ee0385530 Add FM class default constructor. 
For classes that configure FM demodulation at runtime.
 2015-12-28 15:51:20 -08:00
Jared Boone
4910bacfa2 Un-comment angle_precise(). Not used, but no reason to comment out. 2015-12-28 15:50:19 -08:00
Jared Boone
49215c3ae6 Remove garbage DSP filter code. 2015-12-28 15:49:47 -08:00
Jared Boone
5ace32a1ee Fix inaccurate comment. 2015-12-20 13:33:08 -08:00
Jared Boone
bddd26d557 Perform frequency-domain windowing of spectrum. 
Reduces sidelobes a bit, improves apparent resolution. Avoids windowing (more RAM and CPU) in baseband.
 2015-12-20 13:31:00 -08:00
Jared Boone
b058d609eb Move packet timestamping into baseband. 
Now reads the RTC peripheral at the end of each received packet.
TODO: Improve resolution to milliseconds or better.
TODO: Work back from end of packet to compute timestamp for beginning of packet.
TODO: Reuse ChibiOS RTC code, which isn't used now because ChibiOS on M0 core is responsible for RTC configuration, and including ChibiOS RTC API on M4 will also try to initialize/manage the peripheral.
 2015-12-12 11:37:30 -08:00
Jared Boone
c825a027b2 Comments regarding threading concerns, future refactoring. 2015-12-11 17:29:58 -08:00
Jared Boone
d1637db2fc Reorder methods in source file to indicate call order. 2015-12-11 17:17:12 -08:00
Jared Boone
088f60f2bc Extract spectrum collector from BasebandProcessor. 
Code size improvement, and less confused classes. :-)
 2015-12-11 12:26:45 -08:00
Jared Boone
75b1cc25ff Missing lambda capture. 2015-12-10 21:21:42 -08:00
Jared Boone
211d1d19ea Move Thread WORKING_AREAs out of classes. 
Limited where and how you could instantiate the classes.
 2015-12-10 21:01:44 -08:00
Jared Boone
a3bab9126d Remove commented, dead code. 2015-12-10 20:13:27 -08:00
Jared Boone
ca7e0f1e20 Remove #include of ChibiOS test.h. 
Would be appropriate if writing a test case project. Someday...
 2015-12-10 18:28:19 -08:00
Jared Boone
d895a54078 Almost finished moving around baseband init/shutdown code. 2015-12-10 17:33:44 -08:00
Jared Boone
f90e5bab6b Push more init/shutdown code out of main(). 2015-12-10 17:29:16 -08:00
Jared Boone
f3979a1d65 Move event initialization code into EventDispatcher. 2015-12-10 17:25:55 -08:00
Jared Boone
95fe57c9aa Consolidate EventDispatcher client code. 2015-12-10 17:20:10 -08:00
Jared Boone
4b3fa25cef Move sending of ShutdownMessage into shutdown(). 
Crazy, I know.
 2015-12-10 17:19:18 -08:00
Jared Boone
6328efb70b Move more baseband main() code into EventDispatcher. 
EventDispatcher might be ripe for a refactor or rename.
 2015-12-10 17:10:28 -08:00
Jared Boone
818790e734 Move init/configure details into RSSI/BasebandThread classes. 2015-12-10 16:33:40 -08:00
Jared Boone
ed25f65e8b Move BasebandThread init into main(). 2015-12-10 16:29:50 -08:00
Jared Boone
13e4b41c1e Trivial clean-up. 2015-12-10 16:15:18 -08:00
Jared Boone
255c568f9e Make some Baseband/RSSIThread members private/const. 2015-12-10 16:14:30 -08:00
Jared Boone
ded33ebabd Extract RSSIThread to separate files. 2015-12-10 16:07:21 -08:00
Jared Boone
e998014e57 Extract BasebandThread, ThreadBase to separate files. 2015-12-10 15:53:54 -08:00
Jared Boone
2808efac4c Remove unused lambda captures. 2015-12-10 15:27:33 -08:00
Jared Boone
e8cf0b8de7 Clean up baseband/main.cpp #includes. 2015-12-10 15:22:20 -08:00
Jared Boone
a7afc58cf8 More consistent use of pass-by-ref, const in baseband code. 2015-12-10 15:18:02 -08:00
Jared Boone
82f367dfea Move code into BasebandThread. 2015-12-10 14:41:07 -08:00
Jared Boone
f369885062 Extract processor factory function. 
A small code size reduction. I tried using std::unique_ptr, but code bloated between 150 and 400 bytes!
 2015-12-10 13:21:27 -08:00
Jared Boone
ef315f0d92 Const/pass-by-reference a bunch more baseband stuff. 2015-12-10 12:36:12 -08:00
Jared Boone
3ed77af0c1 BasebandProcessor: Streamline construction of some messages. 2015-12-10 12:25:11 -08:00
Jared Boone
77aceaaf56 More BasebandProcessor pass by reference. 2015-12-10 12:17:40 -08:00
Jared Boone
14f24d8584 Move BasebandProcessor message.push() from dedicated methods to existing lambdas. 2015-12-10 12:04:43 -08:00
Jared Boone
98abc4bba8 Create baseband statistics messages on stack. 
Code size shrank ~200 bytes with this change.
 2015-12-10 11:57:57 -08:00
Jared Boone
3bed016128 BasebandProcessor interface change to pass references, not copies. 2015-12-10 11:56:16 -08:00
Jared Boone
eb1402764e Move ERT packet type to its rightful place. 
No longer mixed up with Message types.
 2015-12-08 16:19:27 -08:00
Jared Boone
d0d97e92cb Rename ::Packet to baseband::Packet. Remove IPC packet types. 2015-12-08 15:15:51 -08:00
Jared Boone
bd33e652ea Abstract packet type/implementation details. 2015-12-07 12:35:05 -08:00
Jared Boone
2d0052fb14 Generalize ERT offset tracking a little. 2015-12-07 09:58:08 -08:00
Jared Boone
b9643dc988 Clean up ERT packet type notation. 
Still not great, but at least repeated code is reduced.
 2015-12-06 15:47:04 -08:00
Jared Boone
4205793b54 Clean up narrowing conversion warning. 2015-12-03 20:58:17 -08:00
Jared Boone
82ff45860e Add basic ERT (OOK) utility meter reception. 
Extracted the Manchester formatting function for use in ERT, now also returns an indication of bits in error.
 2015-12-01 11:24:48 -08:00
Jared Boone
435824e9b5 Clean up buffer_t constructors. 2015-11-20 11:21:31 -08:00
Jared Boone
600a983d5c Clean up complex<int16_t> -> complex<float> casting. 2015-11-20 11:01:41 -08:00
Jared Boone
85e984ed3b Clean up complex<int8_t> -> complex<float> casting. 2015-11-19 12:42:35 -08:00
Jared Boone
060da5d227 Add ChannelDecimator decimate by 2 and no-shift options. 2015-11-19 12:24:20 -08:00
Jared Boone
ccd64f3cd9 Add function for c8->c16 decimate by two without fs/4 shift. 2015-11-19 12:20:20 -08:00
Jared Boone
8967f0eaa1 Move common matchers to PacketBuilder. 2015-11-16 10:33:50 -08:00
Jared Boone
1770dff522 Finish object-izing Baseband and RSSI threads. 2015-11-11 10:54:36 -08:00
Jared Boone
d9106b6f44 Start object-ization of RSSI thread. 2015-11-11 10:11:37 -08:00
Jared Boone
19c89def75 Start to object-ize the baseband thread function. 2015-11-11 10:02:06 -08:00
Jared Boone
2c64454172 More constructor style clean-up. 2015-11-11 09:35:28 -08:00
Jared Boone
d02698a6de Apparent bug where min/max aren't initialized from value inside the buffer bounds. 
The fix is less than ideal, it assumes that an incoming buffer length is always >= 1.
 2015-11-11 09:30:15 -08:00
Jared Boone
ebf103363c Constructor style clean-up. 2015-11-11 09:16:20 -08:00
Jared Boone
9f6c495fef Add TPMS initial demodulator implementation. 
Right now, 2FSK, 19200 baud, +/-38400Hz deviation. No effort is made to check CRC/checksums or decode packets.
 2015-11-10 15:19:56 -08:00
Jared Boone
6cdef7026d Remove spectrum window-presum due to lack of code RAM. 2015-11-10 15:16:27 -08:00
Jared Boone
99871dcb84 Move a few member variables to stack/constants. 2015-11-10 15:10:52 -08:00
Jared Boone
981c2fbfbd Complete FSKProcessor's trip to being AISProcessor. 2015-11-10 15:04:38 -08:00
Jared Boone
111a5f10c0 Add some baseband constructors. 
Some of them I think I took out earlier...
 2015-11-10 14:04:50 -08:00
Jared Boone
add6171410 Move BasebandStatistics from heap to stack. 2015-11-10 13:59:17 -08:00
Jared Boone
0789d50fdf Rework BitHistory, BitPattern, PacketBuilder. 
Templatize PacketBuilder to optionally bit unstuff, and have flexible packet termination behavior.
 2015-11-09 14:38:09 -08:00
Jared Boone
5dcca89172 FSKProcessor: remove separate channel filter. 
RRC filter alone will do the trick!
 2015-11-07 14:10:44 -08:00
Jared Boone
fc037c739a Comment about correct MatchedFilter usage. 
Because the filter expects a combined translate/rotate and low-pass filter in the taps, the taps must be a multiple of the translate sinusoid period.
 2015-11-07 11:27:31 -08:00
Jared Boone
ae225e8c3b Further MatchedFilter optimization using algebraic identities and stuff. 
Can't stop premature optimization!!!
 2015-11-06 09:40:05 -08:00
Jared Boone
100761481e Fix inaccurate comment. 2015-11-06 09:40:05 -08:00
Jared Boone
3d5c8056d9 Premature optimization of MatchedFilter::shift_by_decimation_factor(). 2015-11-06 09:40:05 -08:00
Jared Boone
4afcc83873 Mark MatchedFilter::is_new_decimation_cycle() as const. 2015-11-06 09:40:05 -08:00
Jared Boone
3c33e20156 Rename MatchedFilter::decimation_factor. 2015-11-06 09:40:05 -08:00
Jared Boone
7a59823211 Stop computing channel spectrum during FSK demod. 
Data is unused, as screen is displaying decoded packets.
 2015-11-06 09:40:05 -08:00
Jared Boone
ddd34793a6 Default constructors and configure methods for baseband classes. 2015-11-06 09:40:05 -08:00
Jared Boone
51df92a05a Rename baseband_ais -> ais_baseband. 
So that ais_baseband and ais_application filenames can be sorted near each other.
 2015-11-06 09:40:04 -08:00
Jared Boone
26c23dc8a0 Use new FIR decimation in FSK demodulator. 
Reduces FIR calculation effort when output samples are skipped at FIR filter, not after.
 2015-11-06 09:40:04 -08:00
Jared Boone
86b068be62 Early calculation to reduce pressure on registers. 2015-11-06 09:40:04 -08:00
Jared Boone
a074e7d8d8 Remove commented code. 2015-11-06 09:40:04 -08:00
Jared Boone
424c0eac3f FIRAndDecimateBy2Complex: expose decimation_factor, bring work function into class. 2015-11-06 09:40:04 -08:00
Jared Boone
cde15e4271 Generalize fir_and_decimate_by_2_complex_fast. 
Permit decimation_factors other than 2.
Permit tap counts != 64 (but still must be multiple of 8).
Half the amount of tap memory required.
Performance is significantly degraded due to greater flexibility -- most likely due to separate sample buffer shift phase, instead of performing shift during output sample calculation.
 2015-11-06 09:40:04 -08:00
Jared Boone
be78ed657f Remove taps_count template arg for FIRAndDecimateBy2Complex. 
Use heap to allocate samples and taps buffers, so filters of different lengths can be supported.
 2015-11-06 09:40:04 -08:00
Jared Boone
0f73d6061a Remove old decimating FIR code. 2015-11-06 09:40:04 -08:00
Jared Boone
015e5516d5 Update/consolidate AIS RRC matched filter taps. 2015-11-06 09:40:04 -08:00
Jared Boone
dab801e167 AIS RX tweak of clock recovery constant for better performance. 2015-11-06 09:40:03 -08:00
Jared Boone
58b97dea68 AIS RX performance improved with 32-tap RRC. 2015-11-06 09:40:03 -08:00
Jared Boone
f82fd1f8d7 Tease apart utility.hpp, other header dependencies. 
Trying to get a host-testable FSK demodulator, and finding a lot of M4- and ChibiOS-specific code is getting included. Boo.
 2015-11-06 09:40:03 -08:00
Jared Boone
e049097f49 Remove spurious commented code. 2015-11-06 09:40:03 -08:00
Jared Boone
4aae77f565 MatchedFilter improvements 
Use single set of taps for positive and negative filters.
Reverse taps (since new samples are pushed into buffer from the high end).
Make complex multiply explicit to avoid fancy but irrelevant arithmetic checks.
Compute negative filter from conjugation of positive filter taps.
Move filter power and difference calculations into MatchedFilter.
 2015-11-06 09:40:03 -08:00