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#!/usr/bin/python
from socket import *
import string
import time
import struct;
import random;
import array;
import cmath;
from numpy import *;
from numpy.fft import *;
from pylab import *;
myport = random.randint(1025,65535);
filename = "output.dat";
msdd_port = 10001
msdd_host = "10.45.4.43"
buf = 100000;
my_udp_addr = ('',10001);
my_udp_addr = ('10.45.1.229 ',10001);
UDPSock = socket(AF_INET,SOCK_DGRAM);
UDPSock.bind(my_udp_addr);
#f_mhz = 3500;
#f_mhz = 3500;
f_mhz = 100;
f_hz = 0;
gain = 0;
window = 3; #0=rect, 1=hanning, 2=hamming, 3=blackman
samples = 12000;
samples = samples*4; #bytes of data we are requesting
decim = 2; #0-8 (3 => 2^3 = 8)
decim = decim+16; # +16 to use 16bit floats instead of 32 bit floats
mode = 0; #0=IQ, 1=MAG, 2=MAGDB
#sets = 0;
sets = 0xffffffff;
size_int = 4;
request_len = 6*size_int; # 6 int items not including the 8 bytes for opcode and length fields
print "request len = %d"%(request_len);
#raw_data = struct.pack("<IIIIIIII", 0x01, 0x18, f_mhz, f_hz, gain, samples, decim, sets);
raw_data = struct.pack("<IIIIIIII", 0x01, request_len, f_mhz, f_hz, gain, samples, decim, sets);
data = raw_data;
UDPSock.sendto(data, (msdd_host, msdd_port));
print "sent"
count = 0;
total_data = [];
state = 0;
vals = [];
mags = [];
re = [];
sample_count = 0;
IQ_bytes=0;
while(True):
print state;
if(state==0):
data = UDPSock.recv(4);
[opcode] = struct.unpack("<I", data);
print "Opcode = %d"%(opcode);
if(opcode==1):
# if UDP mode and sets_stream requested,
# we do not get a header reply back, only data
if(sets == 0):
state = 1;
else:
state = 2;
elif(state==1):
data = UDPSock.recv(7*4);
args = struct.unpack("<IIIIIII", data);
print ["reply_len", "freq_mhz", "offset_hz", "gain", "sample_bytes", "decim", "sets_remain"];
print args;
IQ_bytes = args[0] - 7*4;
state =2;
elif(state==2):
data = UDPSock.recv(4);
[i,q] = struct.unpack("<hh", data);
tmp = complex(i,q);
re.append(i);
vals.append(tmp);
mags.append(abs(tmp));
sample_count = sample_count + 1;
# print "sample count %d"%(sample_count)
IQ_bytes = IQ_bytes - 4;
if(IQ_bytes < 4):
print "got all data (total %d)"%(sample_count);
print "remaining: %d"%(IQ_bytes);
break;
UDPSock.close();
print "done"
nmags = []
for i in mags:
if i == 0:
i=1;
nmags.append(i);
subplot(2,1,1);
plot(20*log10(nmags));
fft_data = 20*log10(fftshift(fft(vals)));
subplot(2,1,2);
plot(fft_data);
show();
f = open(filename, "w");
for sample in vals:
binchunk = struct.pack("<ff",float(sample.real), float(sample.imag) );
f.write(binchunk);
f.close();
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