trx/ctrl_if_bb.py: reset transceiver on POWEROFF

Change-Id: I1e7f74c56388a431794a0b32b8a9537c360f5d33

python/trx/ctrl_if_bb.py

@@ -63,6 +63,9 @@ class CTRLInterfaceBB(CTRLInterface):
 				self.tb.stop()
 				self.tb.wait()
 
+			# POWEROFF is also used to reset transceiver
+			self.tb.reset()
+
 			return 0
 
 		# Gain control

python/trx/radio_if.py

@@ -269,6 +269,12 @@ class RadioInterface(gr.top_block):
 
 		return True
 
+	def reset(self):
+		# TODO: do we need to reset both RX / TX freq.?
+		# self.rx_freq = None
+		# self.tx_freq = None
+		self.set_ta(0)
+
 	def calc_phase_inc(self, fc):
 		return self.ppm / 1.0e6 * 2 * pi * fc / self.sample_rate