osmo-trx: GSM signal generator

Hi All, I wrote a GSM signal generator application based on osmo-trx. The new osmo-siggen allows random GSM or EDGE burst generation without using special configurations of osmo-trx or the socket control interface. Frame trigger output through GPIO is also available. I use the application for testing modulation parameters and other PHY level testing. Hopefully it's useful to other developers beyond myself. $ ./osmo-siggen -h Options: -h, --help This text -a, --args UHD device args -l --log Logging level ('err', 'warn', 'notice', 'info', 'debug') -b, --burst Burst type ('normal', 'access', 'freq', 'sync', 'edge') -r, --ref Frequency reference ('internal', 'external', 'gps') -f, --freq Tx RF frequency -g, --gain Tx RF gain -s, --sps Tx samples-per-symbol (only 4 supported) -m, --mod GSMK modulator type ('laurent4', 'laurent2', 'laurent1', 'nco') -p, --ampl Tx amplitude (0.0 - 1.0) -o, --offset Baseband frequency offset -t, --tsc Normal and EDGE burst training sequence (0-7) -S, --swap Swap channels Currently osmo-siggen is located in the below branch. I've tested solely with B210. C++14 availability is also required for now. git://git.osmocom.org/osmo-trx ttsou/siggen -TT