FreeCalypso > hg > fc-rfcal-tools

annotate autocal/txlevels.c @ 124:9f09a7c3607a

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fc-rfcal-txband: level error tolerance tightened to 0.75 dB
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 12 Jan 2019 20:15:17 +0000
parents 4c3f4231a021
children
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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 "txvout.h"
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11 #include "txband.h"
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12
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13 extern double tx_power_meas();
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14 extern vout_t dbm_to_vout();
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15
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16 extern struct txcal_band *txcal_band;
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17 extern struct tx_basis_point tx_basis[MAX_BASIS_POINTS];
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18 extern unsigned num_basis_points;
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19 extern struct tx_level tx_levels[MAX_TX_LEVELS];
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20
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21 unsigned
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22 find_apc_for_target(target_dbm, pslope)
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23 double target_dbm;
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24 vout_t *pslope;
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25 {
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26 vout_t target_vout, slope;
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27 unsigned n;
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28 int apc_delta;
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29
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30 target_vout = dbm_to_vout(target_dbm);
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31 for (n = 0; n < num_basis_points - 1; n++)
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32 if (target_vout < tx_basis[n+1].vout)
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33 break;
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34 if (n == num_basis_points - 1)
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35 slope = tx_basis[n-1].slope;
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36 else
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37 slope = tx_basis[n].slope;
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38 if (pslope)
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39 *pslope = slope;
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40 apc_delta = (target_vout - tx_basis[n].vout) / slope;
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41 return tx_basis[n].apc + apc_delta;
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42 }
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43
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44 calibrate_tx_levels()
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45 {
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46 unsigned plnum, plidx, apc;
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47 double target, meas, error;
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48 int nanflag = 0, errflag = 0;
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49
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50 printf("Calibrating Tx power levels\n");
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51 printf("Starting RF Tx on the DUT\n");
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52 do_rfe(RX_TX_TCH);
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53
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54 for (plnum = txcal_band->start_plnum; plnum <= txcal_band->end_plnum;
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55 plnum++) {
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56 do_txpw(TX_PWR_LEVEL, plnum);
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57 plidx = plnum - txcal_band->start_plnum;
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58 target = tx_levels[plidx].target;
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59 apc = find_apc_for_target(target, &tx_levels[plidx].slope);
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60 tx_levels[plidx].apc = apc;
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61 do_txpw(TX_APC_DAC, apc);
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62 do_txpw(TX_CHAN_CAL_TABLE,
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63 txcal_band->calchan_selections[plidx]);
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64 usleep(20000);
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65 meas = tx_power_meas();
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66 if (isnan(meas))
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67 nanflag = 1;
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68 error = meas - target;
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69 if (error < -0.75 || error > 0.75)
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70 errflag = 1;
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71 printf(
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72 "Tx power level #%u: target %.1f dBm, APC=%u, meas %.2f dBm (%+.2f)\n",
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73 plnum, target, apc, meas, error);
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74 }
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75
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76 printf("Stopping RF Tx on the DUT\n");
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77 do_rfe(STOP_ALL);
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78 if (nanflag) {
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79 printf("Error: got NaN power measurement, aborting\n");
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80 exit(ERROR_RFFAIL);
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81 }
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82 if (errflag) {
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83 printf("Error: Tx power off by more than 0.75 dB, aborting\n");
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84 exit(ERROR_RFFAIL);
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85 }
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86 return(0);
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87 }