Hello. I want to create a graph with two fft blocks for UHD4 and
manage them using python.
I am using USRP E310. My FPGA connections look like this:
0/Radio#0:0==>0/FFT#0:0
0/FFT#0:0==>0/SEP#0:0
0/Radio#0:1==>0/FFT#1:0
0/FFT#1:0==>0/SEP#1:0
I want to receive data from two blocks at the same time.
But as a result, I get 0 samples. Here is my code:
```
import numpy as np
import uhd
graph = uhd.rfnoc.RfnocGraph('type=e3xx')
for i in graph.enumerate_static_connections():
print(i.to_string())
fft_lenght = 1024
radio_noc_block = graph.get_block('0/Radio#0')
radio_block = uhd.rfnoc.RadioControl(radio_noc_block)
radio_block.set_rx_frequency(856e6,0)
radio_block.set_rx_gain(65,0)
radio_block.set_rx_antenna('RX2',0)
radio_block.set_rate(100e3)
fft_amplitude = uhd.libpyuhd.rfnoc.fft_magnitude.COMPLEX
fft_direction = uhd.libpyuhd.rfnoc.fft_direction.FORWARD
fft_shift = uhd.libpyuhd.rfnoc.fft_shift.REVERSE
fft = uhd.rfnoc.FftBlockControl(graph.get_block('0/FFT#0'))
fft.set_length(fft_lenght)
fft.set_magnitude(fft_amplitude)
fft.set_direction(fft_direction)
fft.set_shift_config(fft_shift)
fft1 = uhd.rfnoc.FftBlockControl(graph.get_block('0/FFT#1'))
fft1.set_length(fft_lenght)
fft1.set_magnitude(fft_amplitude)
fft1.set_direction(fft_direction)
fft1.set_shift_config(fft_shift)
graph.connect('0/Radio#0',0,'0/FFT#0',0,False)
graph.connect('0/Radio#0',1,'0/FFT#1',0,False)
sa = uhd.usrp.StreamArgs('fc32','sc16')
sa.args = 'spp='+str(fft_lenght)
rx_streamer = graph.create_rx_streamer(2,sa)
graph.connect('0/FFT#1',0,rx_streamer,1)
graph.connect('0/FFT#0',0,rx_streamer,0)
num_samps = int(fft.get_length()*5)
radio_zeros = np.zeros((2,num_samps),dtype=np.complex64)
graph.commit()
print(num_samps)
stream_cmd = uhd.types.StreamCMD(uhd.types.StreamMode.num_done)
stream_cmd.num_samps =num_samps
stream_cmd.stream_now = False
stream_cmd.time_spec =
graph.get_mb_controller(0).get_timekeeper(0).get_time_now()+0.1
rx_streamer.issue_stream_cmd(stream_cmd)
rx_metadata = uhd.types.RXMetadata()
num_samps = rx_streamer.recv(radio_zeros,rx_metadata,0.1)
print(num_samps)
print(rx_metadata)
print(radio_zeros)
```
And I am getting the following error:
Has timespec: No Time of first sample: 0
Fragmented: No Fragmentation offset: 0
Start of burst: No End of burst: No
Error Code: ERROR_CODE_TIMEOUT Out of sequence: No
Please tell me what the problem is,
since I did not find documentation and examples other than
https://www.youtube.com/watch?v=fbcxm7f-Tj0&t=290s
Thank you in advance
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