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synced 2024-12-23 08:27:42 +02:00
atrf-path: added min/max values and corrected averaging algorithm
- atrf-path.c (rssi_to_dBm, sample): moved RSSI value to dBm conversion to separate function - atrf-path.c (sample): corrected calculation of average - atrf-path.c (sample): also output minimum and maximum value - plot: new option -e to display extremal values - plot: added comment to explain y range
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@ -50,10 +50,17 @@ static void init_rx(struct atrf_dsc *dsc, int trim, int chan)
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}
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static double rssi_to_dBm(double rssi)
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{
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return -91+3*(rssi-1);
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}
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static void sample(struct atrf_dsc *tx, struct atrf_dsc *rx, int trim_tx,
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int power, int chan, int cont_tx, int samples)
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{
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int i, rssi = 0;
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int i, rssi;
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int sum = 0, min = -1, max = -1;
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double offset = tx_power_step2dBm(tx, power);
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init_tx(tx, trim_tx, power, chan);
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@ -67,14 +74,20 @@ static void sample(struct atrf_dsc *tx, struct atrf_dsc *rx, int trim_tx,
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/* according to 8.3.2, PHY_RSSI is updated every 2 us */
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usleep(2);
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rssi += atrf_reg_read(rx, REG_PHY_RSSI) & RSSI_MASK;
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rssi = atrf_reg_read(rx, REG_PHY_RSSI) & RSSI_MASK;
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sum += rssi;
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if (min == -1 || rssi < min)
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min = rssi;
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if (rssi > max)
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max = rssi;
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}
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cw_test_end(tx);
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printf("%.1f %.1f\n",
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printf("%.1f %.2f %.0f %.0f\n",
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2350+5*chan+(cont_tx == CONT_TX_M500K ? -0.5 : 0.5),
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-91+3*(rssi-1.0)/samples-offset);
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rssi_to_dBm((double) sum/samples)-offset,
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rssi_to_dBm(min)-offset, rssi_to_dBm(max)-offset);
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}
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@ -2,11 +2,18 @@
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usage()
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{
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echo "usage: file ..." 1>&2
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echo "usage: [-e] file ..." 1>&2
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exit 1
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}
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style=lines
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if [ "$1" = -e ]; then
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style=errorlines
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shift
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fi
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[ "$1" ] || usage
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files=
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while [ "$1" ]; do
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[ "$files" ] && files="$files, "
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@ -15,9 +22,12 @@ while [ "$1" ]; do
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done
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gnuplot -persist <<EOF
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# the y range is not entirely correct - we have RSSI in [-94, -10], and
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# TX in [-17, 3], so the theoretically possible range would be [-97, 7].
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set yrange [-94:-10]
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set ylabel "RX-TX power (dBm)"
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set xlabel "Frequency (MHz)"
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set style data lines
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set bars small
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set style data $style
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plot $files
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EOF
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