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90 lines
1.5 KiB
Bash
Executable File
90 lines
1.5 KiB
Bash
Executable File
#!/bin/sh
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PATH=..:$PATH
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usage()
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{
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echo "usage: $0 [-f font] [-m] [-o fft_file] [-p png_file] prefix \
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frequency" 1>&2
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exit 1
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}
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font=
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term=
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output=
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show_max=false
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out=
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while true; do
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case "$1" in
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-f) [ "$2" ] || usage
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shift
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font=$1;;
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-m) show_max=true;;
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-o) [ "$2" ] || usage
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shift
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out=$1;;
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-p) [ "$2" ] || usage
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shift
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term="set term png"
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output="set output \"$1\"";;
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-*) usage;;
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*)
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break;;
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esac
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shift
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done
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[ "$2" ] || usage
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[ "$3" ] && usage
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tmp=${out:-_tmp}
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prefix=$1
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f=$2
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fft -s 100 -d -w hamming 100 <$prefix-$f >$tmp
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set `norm $tmp`
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xm=$1.0 # sample number of y peak
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ym=$2 # magnitude of y peak
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n=$3 # total number of samples
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span=6.25 # ADC sample rate in MHz / decimation (100 MHz/16)
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if [ ${ym#-} = $ym ]; then
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ymbar=-$ym
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ymbarlt=2
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else
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ymbar=$ym
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ymbarlt=1
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fi
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gnuplot -persist <<EOF
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$term
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$output
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set label "$prefix" at graph 0.03, graph 0.93 font "$font,22"
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set label sprintf("%+.1f dB", $ym) at graph 0.03, graph 0.82 font "$font,18"
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set label sprintf("%.1f MHz", $f-0.5) \
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at graph 0.97, graph 0.93 right font "$font,22"
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set label sprintf("%+.1f ppm", (($xm/$n-0.5)*$span+0.5)/($f-0.5)*1000000) \
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at graph 0.97, graph 0.82 right font "$font,18"
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set xrange [-2.5:2.5]
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set yrange [-70:0]
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set mxtics 10
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set mytics 2
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set grid
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set xlabel "MHz from nominal frequency of test wave"
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set style fill solid 1
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plot "$tmp" using ((\$0/$n-0.5)*$span+0.5):(\$1-$ym) with lines notitle, \
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"<echo -0.9 $ymbar 0.2" with boxes lt $ymbarlt notitle
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EOF
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[ "$out" ] || rm -f $tmp
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$show_max && echo $ym
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