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2017-06-14siggen: Add osmo-siggen for GSM/EDGE test signal generationttsou/siggenTom Tsou1-0/+490
* Adds 4 and 1 pulse Laurent GMSK modulators * Adds NCO based modulator * Adds synchronization and frequency burst generators * Adds GPIO frame trigger on GPIO-0 * Tested on USRP B210 only * Requires C++14 support B210 GPIO Pin Map J504 --------- fp_gpio<0> | 1 | 2 | fp_gpio<1> --------- fp_gpio<2> | 3 | 4 | fp_gpio<3> --------- fp_gpio<4> | 5 | 6 | fp_gpio<5> --------- fp_gpio<6> | 7 | 8 | fp_gpio<7> --------- gnd | 9 | 10| gnd --------- Change-Id: I891725d7f0cfa97c79e64f978a60dc11a206195c Signed-off-by: Tom Tsou <tom.tsou@ettus.com>