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atrf-path: added min/max values and corrected averaging algorithm

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- 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
This commit is contained in:
Werner Almesberger
2011-04-12 20:53:17 -03:00
parent a2e0e1d807
commit b159e00316
2 changed files with 29 additions and 6 deletions
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21
tools/atrf-path/atrf-path.c
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@@ -50,10 +50,17 @@ static void init_rx(struct atrf_dsc *dsc, int trim, int chan)
}
static double rssi_to_dBm(double rssi)
{
return -91+3*(rssi-1);
}
static void sample(struct atrf_dsc *tx, struct atrf_dsc *rx, int trim_tx,
int power, int chan, int cont_tx, int samples)
{
int i, rssi = 0;
int i, rssi;
int sum = 0, min = -1, max = -1;
double offset = tx_power_step2dBm(tx, power);
init_tx(tx, trim_tx, power, chan);
@@ -67,14 +74,20 @@ static void sample(struct atrf_dsc *tx, struct atrf_dsc *rx, int trim_tx,
/* according to 8.3.2, PHY_RSSI is updated every 2 us */
usleep(2);
rssi += atrf_reg_read(rx, REG_PHY_RSSI) & RSSI_MASK;
rssi = atrf_reg_read(rx, REG_PHY_RSSI) & RSSI_MASK;
sum += rssi;
if (min == -1 || rssi < min)
min = rssi;
if (rssi > max)
max = rssi;
}
cw_test_end(tx);
printf("%.1f %.1f\n",
printf("%.1f %.2f %.0f %.0f\n",
2350+5*chan+(cont_tx == CONT_TX_M500K ? -0.5 : 0.5),
-91+3*(rssi-1.0)/samples-offset);
rssi_to_dBm((double) sum/samples)-offset,
rssi_to_dBm(min)-offset, rssi_to_dBm(max)-offset);
}