IEEE 802.15.4 subsystem
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IEEE 802.15.4 subsystem Git Source Tree
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| Source at commit 624caeb00652f6118dc64698b7dad6fa3e5bdcc2 created 6 years 9 months ago. By Werner Almesberger, atusb/: use VR, POWERED, and LED from kicad-libs | |
|---|---|
| 1 | #!/usr/bin/perl |
| 2 | |
| 3 | sub read |
| 4 | { |
| 5 | local ($n) = "$_[0].fft"; |
| 6 | local (@f); |
| 7 | local $i = 0; |
| 8 | local $ym, $v; |
| 9 | |
| 10 | open(FILE, $n) || die "$n: $!"; |
| 11 | while (<FILE>) { |
| 12 | chop; |
| 13 | push(@f, $_); |
| 14 | $ym = $_ unless defined $ym && $ym > $_; |
| 15 | } |
| 16 | close FILE; |
| 17 | for (@f) { |
| 18 | $v = $_-$ym; |
| 19 | $min[$i] = $v unless defined $min[$i] && $min[$i] < $v; |
| 20 | $max[$i] = $v unless defined $max[$i] && $max[$i] > $v; |
| 21 | $sum[$i] += $v; |
| 22 | $i++; |
| 23 | } |
| 24 | } |
| 25 | |
| 26 | |
| 27 | sub usage |
| 28 | { |
| 29 | print STDERR "usage: $0\n"; |
| 30 | exit(1); |
| 31 | } |
| 32 | |
| 33 | |
| 34 | &usage if @ARGV; |
| 35 | |
| 36 | # |
| 37 | # @@@ for future study: use an x axis proportional to the center frequency, |
| 38 | # instead of an absolute frequency. |
| 39 | # |
| 40 | |
| 41 | for ($f = 2405; $f <= 2480; $f += 5) { |
| 42 | &read($f); |
| 43 | &read($f+1); |
| 44 | $n += 2; |
| 45 | } |
| 46 | |
| 47 | $mhz_per_bin = 100.0/16/@sum; # 100 MHz ADC, decimation 16 |
| 48 | |
| 49 | $, = " "; |
| 50 | for ($i = 0; $i != @sum; $i++) { |
| 51 | print $mhz_per_bin*($i-@sum/2)+0.5, ""; |
| 52 | print $min[$i], $sum[$i]/$n, $max[$i], "\n"; |
| 53 | } |
| 54 | |
