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RDS modulator for FPGA

This code comes complete with FM transmitter. No external components are needed, not even antenna if FPGA is 1m close to the receiver.

Tune FM radio to 107.9 MHz (or change freq in main.v) and RDS example text "TEST1234" should appear.

There's a simple audio tone synth, pressing buttons will play notes.

Currently MONO only, STEREO is planned but not yet ready.

Tested with ULX2S, porting to other FPGAs should be very possible.

Credits:

Marko Zec, svirajfm FM radio lab excercise for ULX2S, fm transmitter and audio midi synth copypasted

N. G. Hubbard RDS transmitter for PIC microcontroller DBPSK waveform copypasted http://www.anotherurl.com/library/rds_formulae.htm

Christophe Jacquet, F8FTK RDS for Raspberry PI Bit message generator in C code copypasted from https://github.com/ChristopheJacquet/PiFmRds

Oona Räisänen OH2EIQ RDS receiver "redsea" for RTL-SDR used as receiver and for debugging https://github.com/windytan/redsea

Name		Name	Last commit message	Last commit date
Latest commit History 105 Commits
altera		altera
dbpsk-wave		dbpsk-wave
debug		debug
diamond		diamond
genmsg		genmsg
lattice		lattice
quartus		quartus
README.md		README.md
bram_rds.vhd		bram_rds.vhd
bram_rds_rom.vhd		bram_rds_rom.vhd
enkoder.vhd		enkoder.vhd
fmgen-dummy.vhd		fmgen-dummy.vhd
fmgen.vhd		fmgen.vhd
main.v		main.v
makefile		makefile
message-1group.vhd		message-1group.vhd
message-custom.vhd		message-custom.vhd
message-debug-bits.vhd		message-debug-bits.vhd
message-hello.vhd		message-hello.vhd
message.vhd		message.vhd
rds.vhd		rds.vhd
strobe.vhd		strobe.vhd
tonegen.vhd		tonegen.vhd

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