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annotate autocal/txlevels.c @ 102:80281b67511f

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fc-rfcal-txband: fixed bug in the corner case when the target power level is above the highest basis point
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 12 Aug 2017 08:47:09 +0000
parents b0618796d28d
children 7ad0495991ed
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1 /*
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2 * The calibration of Tx power levels is implemented here.
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3 */
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4
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5 #include <math.h>
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <rvinterf/l1tm.h>
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9 #include <rvinterf/exitcodes.h>
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10 #include "txband.h"
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11
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12 extern double tx_power_meas();
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13 extern vout_t dbm_to_vout();
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14
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15 extern struct txcal_band *txcal_band;
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16 extern struct tx_basis_point tx_basis[MAX_BASIS_POINTS];
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17 extern unsigned num_basis_points;
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18 extern struct tx_level tx_levels[MAX_TX_LEVELS];
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19
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20 unsigned
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21 find_apc_for_target(target_dbm, pslope)
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22 double target_dbm;
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23 vout_t *pslope;
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24 {
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25 vout_t target_vout, slope;
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26 unsigned n;
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27 int apc_delta;
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28
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29 target_vout = dbm_to_vout(target_dbm);
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30 for (n = 0; n < num_basis_points - 1; n++)
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31 if (target_vout < tx_basis[n+1].vout)
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32 break;
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33 if (n == num_basis_points - 1)
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34 slope = tx_basis[n-1].slope;
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35 else
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36 slope = tx_basis[n].slope;
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37 if (pslope)
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38 *pslope = slope;
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39 apc_delta = (target_vout - tx_basis[n].vout) / slope;
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40 return tx_basis[n].apc + apc_delta;
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41 }
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42
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43 calibrate_tx_levels()
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44 {
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45 unsigned plnum, plidx, apc;
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46 double target, meas, error;
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47 int nanflag = 0, errflag = 0;
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48
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49 printf("Calibrating Tx power levels\n");
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50 printf("Starting RF Tx on the DUT\n");
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51 do_rfe(RX_TX_TCH);
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52
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53 for (plnum = txcal_band->start_plnum; plnum <= txcal_band->end_plnum;
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54 plnum++) {
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55 do_txpw(TX_PWR_LEVEL, plnum);
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56 plidx = plnum - txcal_band->start_plnum;
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57 target = tx_levels[plidx].target;
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58 apc = find_apc_for_target(target, &tx_levels[plidx].slope);
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59 tx_levels[plidx].apc = apc;
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60 do_txpw(TX_APC_DAC, apc);
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61 usleep(20000);
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62 meas = tx_power_meas();
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63 if (isnan(meas))
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64 nanflag = 1;
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65 error = meas - target;
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66 if (error < -2.0 || error > 2.0)
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67 errflag = 1;
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68 printf(
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69 "Tx power level #%u: target %.1f dBm, APC=%u, meas %.2f dBm (%+.2f)\n",
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70 plnum, target, apc, meas, error);
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71 }
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72
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73 printf("Stopping RF Tx on the DUT\n");
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74 do_rfe(STOP_ALL);
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75 if (nanflag) {
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76 printf("Error: got NaN power measurement, aborting\n");
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77 exit(ERROR_TARGET);
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78 }
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79 if (errflag) {
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80 printf("Error: Tx power off by more than 2 dBm, aborting\n");
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81 exit(ERROR_TARGET);
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82 }
83
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83 return(0);
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84 }