Hello,
I'm writing a block doing signal processing and then append the current time
and output to a file sink, however, I found the output really strange because
all time values are the same. Then I tried to write another block to test with
my time value. Here is the block and qa file
#######################
import numpy as np
from gnuradio import gr
class time_test(gr.sync_block):
"""
docstring for block time_test
"""
def __init__(self, vlen):
self.vlen = vlen
gr.sync_block.__init__(self,
name="time_test",
in_sig=[(np.float32,self.vlen)],
out_sig=[np.float32])
def work(self, input_items, output_items):
in0 = input_items[0]
print 'in0',in0
time = in0[0]
print 'time',time
# <+signal processing here+>
output_items[0][:] = time
return len(output_items[0])
#########################
from gnuradio import gr, gr_unittest
from gnuradio import blocks
from time_test import time_test
import timeit
class qa_time_test (gr_unittest.TestCase):
def setUp (self):
self.tb = gr.top_block ()
def tearDown (self):
self.tb = None
def test_001_t (self):
# set up fg
start = timeit.default_timer()
src_data = [start]
print 'src_data', src_data
expected_result = [start]
src = blocks.vector_source_f (src_data, False, vlen=1)
res = time_test(1)
snk = blocks.vector_sink_f (vlen = 1)
self.tb.connect (src, res)
self.tb.connect (res, snk)
self.tb.run ()
result_data = snk.data()
print 'result_data',result_data
# check data
self.assertFloatTuplesAlmostEqual (expected_result, result_data, 6)
if __name__ == '__main__':
gr_unittest.run(qa_time_test, "qa_time_test.xml")
############################
And here is the output:
src_data [1470603836.297275]
in0 [ 1.47060378e+09]
time 1.4706e+09
result_data (1470603776.0,)
Ran 1 test in 0.002s
FAILED (failures=1)
It's a very strange issue and actually a float32 should have enough precision
to handle my time value, I tried different float number and here's other float
values I input:
src_data [0.297275]
in0 [ 0.29727501]
time 0.297275
result_data (0.29727500677108765,)
Ran 1 test in 0.002s
OK
----------------------------------------------------------------
src_data [836.297275]
in0 [ 836.29730225]
time 836.297
result_data (836.2973022460938,)
Ran 1 test in 0.003s
FAILED (failures=1)
Did I missed something when I read the input from gnuradio? Could anyone help
me with this issue?
Thanks!
Best regards,
Ziang Gao.
Sent from my iPhone
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