Terminate the receiver

GNU Radio
1

Hi All,

I am working on the OFDM project. When I run sudo
./benchmark_ofdm_rx_video.py -f 450M -R A -v -d 32 --fft-length 128
–occupied-tones 100 --cp-length 32, I want to terminate the process if
the
pktno>100. I tried:

def main():
…
def rx_callback(ok, payload):
global n_rcvd, n_right
n_rcvd += 1
(pktno,) = struct.unpack(‘!H’, payload[0:2])
if ok:
n_right += 1
print “ok: %r \t pktno: %d \t n_rcvd: %d \t n_right: %d” % (ok,
pktno, n_rcvd, n_right)

    if pktno > 250:
        raise SystemExit(0)
    ......

However, it just stops to receive when pktno>100. The output is like:
…
ok: True pktno: 249 n_rcvd: 243 n_right: 243
ok: True pktno: 250 n_rcvd: 244 n_right: 244
ok: True pktno: 251 n_rcvd: 245 n_right: 245

Actrually, I want to terminate the process, and give a new parameter,
say
sudo ./benchmark_ofdm_rx_video.py -f 460M -R A -v -d 32 --fft-length 128
–occupied-tones 100 --cp-length 32. How can I achieve it?

Thanks,
Brook

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