liquid_ssb.c

[Claudio-Sjo]

the file liquid_ssb.c is missing for generating pissb

[mfalkvidd]

Sorry for not checking myself (I don’t have access to a linux computer at the moment) but see if sudo apt-get install libliquid-dev helps.

edit: sorry, that won’t help. Seems like the file has been missing since the initial commit 6 years ago.

[Claudio-Sjo]

Hi,
actually it doesn't.
The file is supposed to exist in sssbgen directory

This is from the Makefile in src directory

../pissb: ssbgen/test_ssb.c ssbgen/ssb_gen.c ssbgen/liquid_ssb.c
$(CC) $(CFLAGS_Pissb) -o ../pissb ssbgen/liquid_ssb.c $(LDFLAGS_Pissb)

[barf]

Check your GCC options, it builds here but the detect script found wrong Pi version

[ticklemynausea]

I'm also stumped trying to build this, don't really know where to turn to. No references in the enitre git log to this liquid_ssb.c file :/ wtf

[ticklemynausea]

well I managed to build pissb with the following changes to src/Makefile:

diff --git a/src/Makefile b/src/Makefile
index 9ea8b70..f838882 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -11,8 +11,8 @@ INSTALL_DIR ?= /usr/local/bin
 CFLAGS_Pissb   = -Wall -g -O2 -Wno-unused-variable
 LDFLAGS_Pissb  = $(LDFLAGS) -lsndfile -lliquid

-../pissb: ssbgen/test_ssb.c ssbgen/ssb_gen.c ssbgen/liquid_ssb.c
-       $(CC) $(CFLAGS_Pissb) -o ../pissb ssbgen/liquid_ssb.c $(LDFLAGS_Pissb)
+../pissb: ssbgen/test_ssb.c ssbgen/ssb_gen.c
+       $(CC) $(CFLAGS_Pissb) -o ../pissb ssbgen/test_ssb.c ssbgen/ssb_gen.c $(LDFLAGS_Pissb)

 ../pisstv : sstv/pisstv.cpp
        $(CXX) $(CXXFLAGS) -o ../pisstv sstv/pisstv.cpp  $(LDFLAGS)

[barf]

Thanks @ticklemynausea this patch worked but I'm not sure this is needed for SSB. USB can be sent using sendiq and some csdr pipes, see the example testssb.sh. Also some examples required linking with the C math library, so I added -lm to the LDFLAGS too.

I can't find the file either but it only prevented building this example, the other SSB example works fine.

To send lower sideband just invert the I and Q (swap the interleaving).

[ticklemynausea]

Yes probably the broken parts of the Makefile aren't really needed for the examples. I still have a lot of exploring left to do.