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Returning to clean state after 0.5s if not synchronized

This commit is contained in:
Piotr K 2014-08-07 17:03:10 +02:00
parent 8e4d72721e
commit 8cfe4c43ea
1 changed files with 19 additions and 5 deletions
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24
python/clock_offset_control.py
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@ -22,6 +22,7 @@
from numpy import *
from gnuradio import gr
import pmt
from threading import Timer
class clock_offset_control(gr.basic_block):
"""
@ -41,6 +42,8 @@ class clock_offset_control(gr.basic_block):
self.ppm_estimate = -1e6
self.first_measurement = True
self.counter = 0
self.last_state = ""
self.timer = Timer(0.5, self.conditional_reset)
def process_measurement(self,msg):
if pmt.is_tuple(msg):
@ -50,15 +53,19 @@ class clock_offset_control(gr.basic_block):
ppm = -freq_offset/self.fc*1.0e6
state = pmt.symbol_to_string(pmt.tuple_ref(msg,2))
if abs(ppm) > 50:
self.last_state = state
if abs(ppm) > 100: #safeguard against flawed measurements
ppm = 0
self.reset()
if state == "fcch_search":
msg_ppm = pmt.from_double(ppm)
self.message_port_pub(pmt.intern("ppm"), msg_ppm)
if state == "synchronized":
self.timer.cancel()
self.timer = Timer(0.5, self.conditional_reset)
self.timer.start()
elif state == "synchronized":
if self.first_measurement:
self.ppm_estimate = ppm
self.first_measurement = False
@ -71,11 +78,18 @@ class clock_offset_control(gr.basic_block):
self.message_port_pub(pmt.intern("ppm"), msg_ppm)
else:
self.counter=self.counter+1
if state == "sync_loss":
elif state == "sync_loss":
self.reset()
msg_ppm = pmt.from_double(0.0)
self.message_port_pub(pmt.intern("ppm"), msg_ppm)
def conditional_reset(self):
if self.last_state != "synchronized":
# print "conditional reset"
self.reset()
msg_ppm = pmt.from_double(0.0)
self.message_port_pub(pmt.intern("ppm"), msg_ppm)
def reset(self):
self.ppm_estimate = -1e6
self.counter = 0