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我一直在努力通過Gnuradio tutorials以瞭解塊是如何製作的。GnuRadio python插值塊
我想做一個插值塊（1輸入：2個輸出），返回兩個輸出流中的常數乘以輸入值。我實現了這個爲從interp_block
import numpy
from gnuradio import gr
class multiply_out_fff(gr.interp_block):
"""
docstring for block multiply_out_fff
"""
def __init__(self, multiple):
gr.interp_block.__init__(self,
name="multiply_out_fff",
in_sig=[numpy.float32],
out_sig=[numpy.float32], interp = 2)
self.multiple = multiple
def work(self, input_items, output_items):
in0 = input_items[0]
out = output_items[0]
print("the data coming in: ", in0)
print("in shape ",in0.shape)
for i in range(0,len(out)/2):
out[i] = in0[i] * self.multiple
for i in range(len(out)/2,len(out)):
out[i] = in0[i-len(out)] * self.multiple
print("the data going out: ", out)
print("out shape ", out.shape)
return len(output_items[0])
我寫該塊測試繼承的類，multiply_out_fff（），並設法得到它來傳遞，而不是在路上，我本來以爲會工作
from gnuradio import gr, gr_unittest
from gnuradio import blocks
from multiply_out_fff import multiply_out_fff
class qa_multiply_out_fff (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
self.data = (0,1,-2,5.5)
self.expected_result = (0,2,-4,11,0,2,-4,11)
print("---------testing----------")
print("test data: ", self.data)
#make blocks
self.src = blocks.vector_source_f(self.data)
self.mult = multiply_out_fff(2)
self.snk1 = blocks.vector_sink_f()
self.snk2 = blocks.vector_sink_f()
#make connections
self.tb.connect((self.src,0),(self.mult,0))
self.tb.connect((self.mult,0),(self.snk1,0))
#self.tb.connect((self.mult,1),(self.snk2,0))
self.tb.run()
self.result_data1 = self.snk1.data()
#self.result_data2 = self.snk2.data()
print("The output data: ", self.result_data1)
print("--------test complete-------------\n")
# check data
self.assertFloatTuplesAlmostEqual(self.expected_result, self.result_data1)
#self.assertFloatTuplesAlmostEqual(self.expected_result, self.result_data2)
if __name__ == '__main__':
gr_unittest.run(qa_multiply_out_fff, "qa_multiply_out_fff.xml")
運行測試腳本給：
~/gnuradio/gr-tutorial/python$ python qa_multiply_out_fff.py
---------testing----------
('test data: ', (0, 1, -2, 5.5))
('the data coming in: ', array([ 0. , 1. , -2. , 5.5], dtype=float32))
('in shape ', (4,))
('the data going out: ', array([ 0., 2., -4., 11., 0., 2., -4., 11.], dtype=float32))
('out shape ', (8,))
('The output data: ', (0.0, 2.0, -4.0, 11.0, 0.0, 2.0, -4.0, 11.0))
--------test complete-------------
.
----------------------------------------------------------------------
Ran 1 test in 0.002s
OK
我掙扎理解的概念是怎麼我的塊返回數據。現在，它將以兩倍於輸入長度的單個數組返回兩個插值輸出流。我認爲它應該有兩個獨立的輸出數組，並讓我有連接到每個輸出一個單獨的水槽，像這樣（在測試中註釋掉）：
self.tb.connect((self.mult,0),(self.snk1,0))
self.tb.connect((self.mult,1),(self.snk2,0))
取而代之的是，我的所有數據流入snk1。如果我取消註釋第二個連接，則會收到錯誤消息，通知我self.mult塊不能有更多的輸出連接。
ValueError: port number 1 exceeds max of 0
我如何做插補塊我可以與多個輸出連接？